Bicarbonate Administration in CKD
Phase: NA
Conditions: Chronic Kidney Disease, Metabolic Acidosis
Sponsor: University of Colorado, Denver

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w 
COMIRB Protocol 
COLORADO MULTIPLE INSTITUTIONAL REVIEW BOARD 
CAMPUS BOX F-490    TELEPHONE:  303-724-1055  Fax:  303-724-0990 
 
 
 
Protocol #: 16-1572 
Project Title: 
Bicarbonate Administration in CKD 
 
 
Principal Investigator:  Jessica Kendrick 
Version Date: June 17, 2020 
 
 
 
 
  
 
I. Hypotheses and Specific Aims: Acid retention is a common complication of chronic kidney disease (CKD) as the 
diseased kidney is unable to excrete the daily dietary acid load. Lower serum bicarbonate levels, even within the normal 
laboratory range, are strongly linked to risks of hypertension, cardiovascular disease (CVD), CKD progression and 
death. Arterial dysfunction begins early in the course of kidney disease and is a key factor responsible for the 
development of left ventricular hypertrophy (LVH) in this population. LVH is the strongest predictor of cardiovascular 
mortality in CKD. Acid retention results in increased production of angiotensin II, endothelin-1 and aldosterone in order 
to enhance urinary acid excretion. All three of these humoral factors both directly and indirectly induce endothelial 
dysfunction, vascular stiffness, LVH and vascular calcification. Small interventional trials have shown that treatment with 
alkali therapy slows progression of kidney disease, even in patients with normal serum bicarbonate levels. Because risk 
factors for CVD and CKD progression often overlap, it is biologically plausible that alkali therapy in CKD patients may 
also result in improved cardiovascular outcomes. In our preliminary data, alkali therapy improved vascular endothelial 
function in 16 patients with CKD stage 3-4. Hence, treatment with alkali therapy may represent an inexpensive and 
novel therapeutic paradigm in CKD. We are proposing a randomized, double-blinded, placebo-controlled, 12-month trial 
of 108 patients with CKD stage 3-4 to examine the effect of sodium bicarbonate therapy on surrogate measures of CVD. 
Our overall hypothesis is that treatment with bicarbonate will improve indicators of vascular function and LVH in patients 
with CKD stage 3-4. Our primary goal is to determine the efficacy of alkali therapy for improving vascular endothelial 
function and reducing large elastic artery stiffness in patients with CKD stage 3-4 using noninvasive procedures. In Aim 
1, we will compare changes over time in brachial artery flow-mediated dilation and aortic pulse wave velocity after 12 
months of sodium bicarbonate therapy or placebo. In Aim 2, we will compare changes over time in LVMI, measured by 
gadolinium free cardiac magnetic resonance imaging, after 12 months of sodium bicarbonate therapy or placebo. In Aim 
3, we will compare changes over time in humoral mediators of urinary acid excretion that promote vascular calcification 
(angiotensin II, endothelin-1 and aldosterone) and a novel test of calcification that provides a measure of the overall 
calcification propensity of serum (T50) after 12 months of sodium bicarbonate therapy or placebo. The results of this 
novel study have the potential to inform clinical practice by providing the necessary evidence to establish sodium 
bicarbonate therapy as an inexpensive and easy to administer option for the treatment of arterial dysfunction in patients 
with CKD stage 3-4. 
 
II. Background and Significance:  
1. Critical need for novel strategies to improve outcomes in chronic kidney disease. Chronic kidney disease 
(CKD) is a worldwide public health problem associated with significant morbidity and mortality. 
Cardiovascular complications are the leading cause of death in patients with CKD. Although patients 
with CKD have a high prevalence of cardiovascular risk factors, the severity and extent of cardiovascular 
complications is disproportionate to these risk factor profiles.23-25 It is therefore imperative to identify 
novel strategies targeting CKD-specific mechanisms to improve outcomes in CKD patients. 
 
2. Cardiovascular disease (CVD) is associated with dysfunction and disorders of arteries. Two of the 
greatest contributors to CVD are the development of vascular endothelial dysfunction, most commonly 
assessed as impaired endothelium-dependent dilation (EDD) and the stiffening of the large elastic 
arteries (aorta and carotid arteries).26 Patients with CKD demonstrate both impaired EDD27-29 
(measured by brachial artery flow mediated dilation (FMDBA)) and increased aortic pulse wave velocity 
(aPWV; the gold standard measure of large elastic artery stiffness).30-33 There is a stepwise increase in 
arterial stiffness through the CKD spectrum. Importantly, both FMDBA and aPWV are key 
pathophysiological antecedents to clinical CVD in patients with CKD.34-36 FMDBA and aPWV are 
independent predictors of all-cause and cardiovascular mortality in patients with CKD.34-36 Each 1% 
increase in FMDBA is associated with a 48% decreased risk of cardiovascular outcomes.36 A recent 
meta-analysis found that the risk of CVD mortality and all-cause mortality is two-fold higher in patients 
with aPWV in the highest tertile compared to the lowest tertile.37 Furthermore, every 1 m/s increase in 
aPWV is associated with a 14% increased risk of CV events.37 FMDBA and aPWV are important 

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noninvasive assessments of atherosclerosis and well recognized surrogate markers for CVD and thus 
constitute the primary outcomes of the current proposal. The PI and investigative team have extensive 
experience with these vascular function measurements and the Division of Renal Diseases and 
Hypertension at the University of Colorado Denver has an established Clinical Vascular Physiology 
Laboratory. The PI has completed a single-center randomized clinical trial of 128 patients with CKD 
stage 3B-4 examining the effect of vitamin D supplementation for 6 months on vascular function (K23 
DK087859). The results of this study were presented at the Late-Breaking Trial session at the American 
Society of Nephrology Annual Meeting in San Diego, CA in November of 2015.  
 
3. Arterial dysfunction is a key factor responsible for the development of left ventricular hypertrophy (LVH) in 
patients with CKD. Abnormal arterial stiffness causes an increase in myocardial oxygen consumption, a 
decrease in myocardial perfusion pressure, an increase in systolic blood pressure (BP) and an increase 
in left ventricular afterload, all of which lead to the development of LVH.38 When arterial distensibility 
decreases, as with increased calcification and remodeling, there is an increase in systolic BP and a fall 
in diastolic BP. There is a close relationship between increased arterial stiffness and increasing left 
ventricular mass index (LVMI) in CKD patients.39 Over 40% of CKD patients show evidence of LVH and 
the prevalence progressively increases with CKD progression.40 LVH is the strongest predictor of 
cardiovascular mortality in CKD. Unfortunately, CKD patients demonstrate progression of LV mass 
despite stable BP, stable kidney function and normal LV systolic function,41 suggesting a mechanism 
unique to CKD such as acid retention (see section 6).  Failure to regress LVH over time is related to 
unchanged arterial stiffness.42 Aortic PWV is an important determinant of LVMI in CKD patients.43-44 
Thus, therapies that can reduce arterial stiffness may have a large impact on LVH. For this reason, the 
objective in our study is to examine the effect of alkali therapy on both arterial dysfunction and LV mass 
in patients with CKD.  
 
4. Vascular calcification (VC) induces arterial stiffness. Vascular calcification is prevalent in patients with 
CKD. Forty percent of patients with CKD have coronary artery calcification, compared to only 13% of 
age-matched controls.45 Patients with VC are at a considerably higher risk of cardiovascular events 
because VC induces arterial stiffness and increases aPWV.46,47 This occurs via arterial remodeling 
and changes in the intrinsic properties of the arterial wall (decreased elastin and increased collagen). 
Calcification affects both the intima and media layers of the vasculature, but medial calcification 
contributes the most to arterial stiffness as it has a direct effect on distensibility.48,49 In patients with 
CKD, studies have found that medial calcification results in higher aPWV.50 The exact pathophysiology 
of VC in CKD is unknown but it is an active process that involves calcium and phosphate metabolism, 
changes of vascular smooth muscle cells (VSMC) into an osteoblastic phenotype and an imbalance 
between promoters and inhibitors of calcification.51 Angiotensin II (AII), aldosterone and endothelin (ET-
1) are not only important mediators of hypertension but they also induce VC (see section 7).15-18 In 
addition, acid retention induces the production of these factors in CKD and treatment with alkali results 
in decreased levels of AII, aldosterone and ET-1 (see section 6).4-8 Hence, alkali therapy may reduce 
arterial dysfunction by reducing VC. To date, no studies have examined the effect of alkali therapy on 
calcification in patients with CKD stage 3-4 (see section 7). 
 
5. Acid retention is common in patients with CKD. As kidney function declines, the kidneys progressively 
lose the ability to synthesize ammonia and excrete hydrogen ions.1 Low bicarbonate levels are more 
common in patients with decreasing kidney function and approximately 19% of patients with CKD stage 
4-5 have a serum bicarbonate level <22 mEq/L.2 However, over 80% of patients with CKD have normal 
serum bicarbonate levels.1-4 It has been proposed that CKD patients ingesting acid-inducing diets have 
sufficient remaining kidney function that enables them to reach a steady state of normal bicarbonate 
levels but at the cost of retaining hydrogen ions.52 In a recent study of 1065 patients with CKD stages 1-
4, acid balance increased as glomerular filtration rate (GFR) declined eventually being significantly 
positive in patients with CKD stage 4 even though 90% of patients had normal serum bicarbonate.3 
Another study found that acid retention was present as early as CKD stage 2.4 Human studies have 
found a positive acid balance of approximately 10-20 mEq/day.3,4,53 Hence, the subsequent acid 
retention, despite serum bicarbonate within the normal laboratory range, results in unfavorable effects 
that can lead to adverse outcomes. 
 
6. Acid retention results in increased production of angiotensin II, aldosterone and endothelin-1. There are a 
number of humoral regulatory mechanisms that play a role in increasing urinary acidification in CKD 
including increased levels of AII, aldosterone and ET-1.4-8 Experimental and human studies have 

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shown that acid retention results in increased levels of these factors and increased expression of AII-
type 1 receptors which are found in numerous tissues including the blood vessels, heart and kidney.4-
8,54 Angiotensin II stimulates ammoniagenesis and increases distal nephron acidification.5,55 It also 
stimulates ET-1 and aldosterone.56,57 ET-1 increases both proximal and distal tubule acidification and 
indirectly increases acidification by stimulating aldosterone.7 In CKD stage 3 patients with bicarbonate 
>22 mEq/L, treatment with alkali therapy for 3 years resulted in reduced urinary angiotensinogen (an 
index of AII), reduced BP and preserved GFR.58 Although all subjects were on angiotensin converting 
enzyme inhibition, urinary angiotensinogen only decreased in those patients on alkali therapy, 
supporting an important role for dietary acid reduction in the decrease of AII. Alkali therapy has also 
been shown to reduce ET-1 and aldosterone levels in CKD.4 
 
7. Persistent activation of angiotensin II, aldosterone and endothelin-1 may result in CVD by inducing 
vascular stiffness and calcification. All three of these factors can directly and indirectly induce endothelial 
dysfunction,9-11 arterial stiffness,9,12,13 and VC.15-18 Angiotensin II, ET-1 and mineralocorticoid 
receptors are found on endothelial cells and VSMC.9,10,59 Activation of these receptors results in 
endothelial dysfunction through inflammation and oxidative stress and arterial stiffness through 
functional and structural alterations in the vessel wall.9-14,59 ET-1 directly induces several processes 
that have been implicated in the pathogenesis of VC including: increased phosphate transport into 
VSMC;60 increased VSMC apoptosis;61 increased osteoblastic differentiation of VSMC;62 increases in 
procalcific factors (e.g. osteopontin)63 and decreases in anticalcific factors (e.g. matrix Gla protein).64 
ET-1 indirectly increases VC by stimulating the production of aldosterone.65 In experimental models, 
endothelin receptor blockers result in decreased VC.66 Aldosterone is also known to promote VC.17 
Aldosterone promotes osteoblastic differentiation of VSMC, increases expression of PIT-1 (type III 
sodium-phosphate transporter) and increases procalcific factors.17 Spironolactone mitigates VC in 
experimental models.17 Angiotensin II may also directly induce VC by 
increasing osteoblastic differentiation of VSMC and increasing 
procalcific factors such as osteopontin.16 Angiotensin II has an indirect 
role in VC as it stimulates the production of both ET-1 and 
aldosterone.56,57 Hence, correction of metabolic acidosis may result in 
improved arterial function through decreases in humoral mediators of 
VC and stiffness. The proposed mechanism of action of the 
cardiovascular protective effects of alkali is presented in Figure 1.  
 
 
To elucidate the mechanisms by which alkali therapy may improve 
arterial function, we are proposing to measure humoral mediators of 
vascular calcification and stiffness and overall serum calcification 
propensity. We will measure T50, a novel test that measures the overall 
calcification propensity of serum.67 T50 is based on the transformation time of amorphous calcium 
phosphate-containing primary calciprotein particles (CPP) to crystalline hydroxyapatite-containing 
secondary CPP.67 A higher T50 represents lower calcification propensity. The balance of promoting and 
inhibiting factors present in serum governs the transformation time. Reduced T50 is associated with 
lower concentrations of fetuin-A and pyrophosphate—inhibitors of VC— and higher phosphate and 
calcium concentrations—promoters of VC. A reduced T50 predicts aortic stiffness and all-cause mortality 
in patients with CKD,21 and appears to improve prediction of calcification above and beyond single 
protein measurements (e.g. fetuin-A and phosphate).21 In our preliminary data (Approach section 1d), 
we show a positive association between serum bicarbonate levels and T50 in CKD stage 3-4, 
suggesting a beneficial role of alkali therapy in CKD. Finally, we will measure plasma AII, aldosterone 
and ET-1. 
 
8. Serum bicarbonate levels and clinical outcomes in CKD. 
a) CKD Progression: Experimental evidence suggests that metabolic acidosis contributes to CKD 
progression.2,52,68 Multiple observational studies have shown that higher serum bicarbonate levels, 
even within the normal range, are associated with a lower risk of CKD progression.69-74 The lowest risk 
of progression is observed with a serum bicarbonate level near 28 mEq/L.69-74 Several small 
interventional trials have shown that bicarbonate administration slows the rate of kidney disease 
progression, even in patients with normal serum bicarbonate levels.70,75,76 In this application we will 
not test the effects of alkali therapy on kidney disease progression, as this is the main goal of the NIH 
 

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sponsored U01 Bicarbonate Administration to Stabilize eGFR (BASE) Study. Instead we will test the 
effects of alkali therapy on surrogate markers of CVD. 
b) CVD: In the general population, several studies have found that lower serum bicarbonate levels are 
associated with incident and prevalent hypertension.77-79 In a study of 695 women from the Nurses’ 
Health Study, those with bicarbonate levels in the highest quintile (>23.8 mmol/L) had 31% lower odds of 
developing hypertension than the lowest quintile (<20.7 mmol/L).77 In young adults aged 20-49 without 
underlying kidney disease, lower bicarbonate levels were associated with lower cardiorespiratory 
fitness.80 In patients with CKD, metabolic acidosis is associated with insulin resistance, a well-known 
CVD risk factor.81-83 Human studies have also found that metabolic acidosis results in activation of the 
renin-angiotensin-aldosterone system.4-8  In a study of 7 healthy male subjects, the FMDBA response 
was significantly attenuated during metabolic acidosis such that the overall ability of the brachial artery 
to vasodilate relative to control conditions was impaired (FMDBA 4.11 ± 3.55% vs. 7.98 ± 2.96%, 
p<0.05).84 In a recent study of over 3,900 CKD participants from the Chronic Renal Insufficiency Cohort 
(CRIC), a nonlinear relationship between serum bicarbonate level and congestive heart failure was 
found.71 The risk of heart failure was highest in participants with serum bicarbonate levels >24 mEq/L 
but there was also a trend towards a higher risk of heart failure with bicarbonate levels at the lower end 
of the range (17-18 mEq/L).71 Thus, similar to the relationship with mortality (see below), a U-shaped 
relationship may exist. Hence, the optimal bicarbonate level for cardiovascular safety in patients with 
CKD is unknown. In our preliminary data, we show that higher serum bicarbonate levels (≥ 25 mEq/L) 
are associated with heart failure, higher LVMI and aortic stiffness in the general population (see 
Approach Section 1b). In addition, we also show that treatment of metabolic acidosis improves vascular 
endothelial function (FMDBA) in CKD stage 3-4 (see Approach Section 1c). To date, no interventional 
trials have been performed examining the effect of alkali therapy on arterial dysfunction and LVMI in 
patients with CKD. 
c) Mortality: Patients with moderate and advanced CKD appear to have a high risk of death with both high 
and low serum bicarbonate (U-shaped association).73,85 In a study of 1,250 CKD patients, the risk of 
death increased by 43% when bicarbonate level was <22 mEq/L and by 24% with a bicarbonate level > 
29 mEq/L.73  
 
9. Bicarbonate administration in CKD. Alkali therapy is currently recommended in CKD patients when the 
serum bicarbonate level is <22 mEq/L to mitigate the effects of acidosis on bone and protein.86 
However, >80% of CKD patients have normal serum bicarbonate levels and do not receive alkali despite 
the fact that they are in positive acid balance.1-4 As discussed earlier, interventional studies have found 
that alkali slows CKD progression in people with normal serum bicarbonate levels. Even though no 
interventional trials have been performed examining the effect of alkali on CVD, results from 
observational studies support the hypothesis that alkali replacement may also reduce cardiovascular 
risk, even in patients with normal bicarbonate.  Hence, a major paradigm shift in the treatment of CKD 
would occur if alkali therapy were effective in reducing CVD in patients with normal serum bicarbonate. 
In the CRIC study, persistent bicarbonate >26 mEq/L was associated with an increased risk of heart 
failure events and death.87 Our preliminary data also show an increased risk of heart failure, higher 
LVMI and arterial stiffness with higher serum bicarbonate levels (≥ 25 mEq/L). The mechanism behind 
the increased risk of adverse outcomes with higher serum bicarbonate levels is unknown, but it is 
hypothesized that it may worsen vascular stiffness and calcification. An alkaline pH increases VC in 
cultured cells and uremic rats88,89 whereas acidosis inhibits calcification.90 However, as discussed 
above in section 7, data suggest that correction of metabolic acidosis may improve VC. This conflicting 
epidemiologic data further strengthens the need for a randomized clinical trial examining the effect of 
alkali therapy on surrogate endpoints of CVD and calcification in patients with CKD.   
 
 
III. Preliminary Studies/Progress Report:  
 
 1. PRELIMINARY DATA 
a) Feasibility of the proposed study is demonstrated by the PIs experience in the NIH sponsored Vitamin 
D and Arterial Function in CKD Trial (K23 DK087859). This single-center study, conducted by the PI Dr. 
Kendrick at the University of Colorado Denver examined the effect of oral cholecalciferol vs. calcitriol for 6 months 
on vascular function in 128 CKD stage 3B-4 patients. Recruitment was accomplished in 36 months with an 
attrition rate of 10%. The PI was responsible for all aspects of the study including overall conduct, design, 
implementation, administration, analysis and interpretation of FMDBA. The PI presented the results at the Late-

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Breaking Trial Session at the American Society of Nephrology Annual Meeting in San Diego, CA in November 
2015.  
 
b) Serum bicarbonate levels are associated with an increased risk of lower FMDBA, arterial stiffness and 
heart failure. We tested associations of serum bicarbonate levels with major subclinical and cardiovascular 
outcomes in a large prospective cohort of community-living individuals, the Multi-Ethnic Study of Atherosclerosis 
(MESA). All MESA participants were free of CVD at study entry. We included 6,229 participants from MESA with 
baseline serum bicarbonate measurements. Serum bicarbonate was examined as a continuous variable and in 
clinically significant categories (<21, 21-22, 23-24 and ≥ 25 mEq/L). Multivariable Cox proportional hazards 
models and linear regression models were used to test associations of serum bicarbonate concentrations with 
incident heart failure, left ventricular mass (LVM) and aortic pulse pressure.   
 
Results: The mean (SD) serum bicarbonate level and mean eGFR were 23.1 (1.8) mEq/L and 78.2 (16.2) 
mL/min/1.73m2, respectively. 174 (2.8%) participants developed incident heart failure during a median (IQR) 
follow-up of 8.5 (7.7-8.6) years. Participants with bicarbonate levels <21 mEq/L were more likely to be younger, 
to be Hispanic, and to have diabetes, higher body mass index and higher eGFR. The association between 
bicarbonate levels and cardiovascular outcomes is shown in Table 1. Since there was a significant interaction 
between bicarbonate levels and diuretic use in patients with incident heart failure we stratified patients by diuretic 
use. After excluding patients on diuretics, we found that each 1 mEq/L increase in serum bicarbonate was 
associated with a 13% increased risk of incident heart failure and with 0.7 gm increase in LVM in fully adjusted 
analyses (Table 1). Bicarbonate levels ≥ 25 mEq/L were associated with higher aortic pulse pressure compared 
to levels of 23-24 mEq/L (β 1.0, 95% CI 0.4, 2.0). Additionally, each 1 mEq/L increase in bicarbonate level was 
associated with a 0.3 mmHg increase in aortic pulse pressure (Table 1). Among patients on diuretics, a 
bicarbonate level <21 mEq/L was associated with almost a two-fold increased risk of lower FMDBA (β -1.77, 95% 
CI -2.98, -0.55). Our data supports that lower bicarbonate may result in arterial dysfunction. The U-shaped 
relationship seen in this epidemiological analysis further strengthens the need for a randomized trial to 
determine the effect of alkali therapy on cardiovascular outcomes.  
Table 1. 
Serum 
Bicarbonate 
level (mEq/L) 
Brachial Artery FMD 
β (95% CI) 
 
Aortic Pulse Pressure 
β (95% CI) 
Left Ventricular Mass 
β (95% CI) 
Incident Heart Failure 
HR (95% CI) 
Diuretic Use      
      < 21 
       21-22 
       23-24 
       ≥ 25 
Per 1 mEq/L increase 
 
No Diuretic Use 
      < 21 
      21-22  
      23-24 
      ≥ 25 
Per 1 mEq/L increase 
 
-1.77 (-2.98, -0.55) 
-0.07 (-0.75, 0.61) 
REF 
-0.2 (-0.74, 0.33) 
0.0 (0.12, 0.13) 
 
 
-0.01 (-0.4, 0.4) 
0.08 (-0.2, 0.3) 
REF 
-0.1 (-0.4, 0.2) 
-0.03 (-0.09, 0.03) 
 
-1.2 (-5.4, 2.9) 
0.5 (-1.5, 2.5) 
REF 
1.2 (-0.4, 2.7) 
0.2 (-0.2, 0.5) 
 
 
-0.6 (-2.0, 0.4) 
-0.08 (-0.7, 0.6) 
REF 
1.0 (0.4, 2.0) 
0.3 (0.1, 0.4) 
 
-7.0 (-22.0, 9.0) 
-1.0 (-7.0, 5.0) 
REF 
-2.0 (-6.0, 3.0) 
0.0 (-1.0, 1.0) 
 
 
-1.0 (-5.0, 2.0) 
0.4 (-1.0, 2.0) 
REF 
3.0 (0.5, 5) 
0.7 (0.2, 1.0) 
 
0.70 (0.19, 2.59) 
1.01 (0.53, 1.95) 
REF 
0.42 (0.21, 0.84) 
0.90 (0.79, 1.01) 
 
 
0.61 (0.26, 1.46) 
0.83 (0.53, 1.31) 
REF 
1.3 (0.8, 2.11) 
1.13 (1.01, 1.26) 
Adjusted for age, sex, race, education, site, diabetes, emphysema, BMI, smoking, HDL, LDL, triglycerides, SBP, eGFR, CRP, urine 
albumin/creatinine ratio, antihypertensive agents, lipid-lowering agents. 
 
We also performed a cross-sectional study examining the association between serum bicarbonate levels and 
arterial stiffness as measured by an ankle brachial pressure index (ABPI) > 1.3 in 1,002 participants from the 
Third National Health and Nutrition Examination Survey. ABPI is a non-invasive assessment of arterial stiffness 
and is a good indirect indicator of VC. A high ABPI indicates calcified vessels and is associated with greater 
LVMI.91 Serum bicarbonate was examined as a continuous variable and in clinically significant categories (<21, 
21-22, 23-24, ≥25 mEq/L). Multivariate regression analyses were used to examine the association between 
serum bicarbonate level and high ABPI >1.3. 
 
Results: The mean (SD) serum bicarbonate level and eGFR was 28.8 (4.3) mEq/L and 104 (31.4) ml/min/1.73m2, 
respectively. 72 (7.2%) of the participants had a high ABPI >1.3. We found no significantly increased risk of an 
ABPI in unadjusted or adjusted analyses with serum bicarbonate levels <21, 21-22, or ≥ 25 mEq/L when 
compared to the reference group (23-24 mEq/L). When serum bicarbonate was measured as a continuous 

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variable, we found a U-shaped relationship in that both lower and higher bicarbonate levels compared to a level 
of 29.6 mEq/L were increasingly more associated with an increased risk of an ABPI >1.3 (p=0.013 each for linear 
and quadratic bicarbonate terms in the unadjusted model).  
 
c) Bicarbonate administration results in improved FMDBA in patients with CKD stage 3-4. We performed a 
pilot, prospective, open label 14-week crossover study examining the effect of treatment of metabolic acidosis 
(defined by a low serum bicarbonate level of 16-22 mEq/L), with oral sodium bicarbonate therapy in 16 patients 
with CKD stage 3B-4.  The primary endpoint was change in FMDBA between treatment and control conditions. 
All patients underwent baseline measurements of FMDBA and then were randomized to either start with treatment 
or control. Each patient served as his or her own control. Each period was 6 weeks in duration with a two-week 
washout period in between. FMDBA was performed at the beginning and end of each period using the methods 
described below in section 9a. During the treatment phase, participants received oral sodium bicarbonate tablets 
at a dose of 0.5 mEq/kg-lean body weight (LBW)/day. Each tablet contained 7.6 mEq of bicarbonate and 178 
mg of sodium.  
Results: The mean (SD) age and eGFR was 58.5 (12.8) years and 
25.3 (8.3) ml/min/1.73m2, respectively. The mean (SD) bicarbonate 
level increased after sodium bicarbonate administration from 19.6 
(2.9) mEq/L to 22.4 (3.0) mEq/L. Blood pressure control was similar 
between the two conditions (mean change in systolic BP: control 0.56 
mmHg, treatment -0.38 mmHg, p=0.86). FMDBA significantly 
improved after 6 weeks of sodium bicarbonate therapy compared to 
control conditions (mean difference in %FMD 1.1% in the treatment 
arm vs. -0.70% in the control arm, p=0.027). The mean (SE) FMDBA 
in the control and treatment arms are shown in Figure 2. Bicarbonate 
administration was well tolerated and there were no adverse events.  
 
d) Higher bicarbonate levels are associated with higher T50 in 
CKD stage 3-4. We performed a cross-sectional study in 128 patients 
with CKD stage 3B-4. We measured serum bicarbonate levels and 
T50 at baseline. Mean serum bicarbonate and T50 levels were 22.9 ± 2.9 mEq/L and 223.4 ± 46.8 min, 
respectively. Each 1 mEq/L increase in bicarbonate was associated with an increase in T50 of 4.83 minutes (β 
4.83, 95% CI 2.19-7.48 per 1mEq/L increase in bicarbonate). The positive relationship persisted after adjustment 
for age, gender and race (β 5.18, 95% CI 2.45-7.90 per 1mEq/L increase in bicarbonate). 
 
IV. Research Methods 
 
A.  Outcome Measure(s):   
Subjects. After obtaining their written informed consent, 108 patients with CKD stage 3B-4 (defined as estimated 
GFR (eGFR) 15-44 ml/min/1.73m2) and a serum bicarbonate level of 22-27 mEq/L, on 2 separate measurements 
(at least 1 day apart), will serve as subjects. Relevant biological variables: Men and women 21 years and 
older of all races/ethnicities will be included. Major inclusion/exclusion criteria are presented in the table below 
(Table 2). We chose a bicarbonate level of 22-27 mEq/L as this is a normal serum bicarbonate level and it is not 
standard of care to give alkali therapy when the bicarbonate level is >22 mEq/L.86 Hence, we can safely 
administer a placebo to these patients. Only stage 3B and not 3A are included as patients with stage 3B have 
an increased risk of adverse outcomes including cardiovascular outcomes and death compared to 3A. Patients 
will undergo screening for eGFR and serum bicarbonate at the Kidney Disease Research Center (KDRC) at the 
University of Colorado Anschutz Medical Campus. Estimated GFR will be calculated using the 4-variable 
Modified Diet Renal Disease prediction equation. Patients will be recruited from nephrology clinics at the 
University of Colorado where the PI has access to over 2,000 CKD patients. Additionally, patients will be recruited 
from our CKD database, which contains over 300 CKD patients willing to participate in clinical trials. The Health 
Data Compass services will also be used to generate a list of potential participants. Feasibility of recruitment is 
demonstrated by prior recruitment experience of the PI in the Vitamin D and Arterial Function in CKD Trial (see 
section 1a).  
Table 2 
Inclusion Criteria 
Exclusion Criteria 
0
2
4
6
Control
Bicarbonate
% FMDBA
Figure 2. Percent FMDBA at baseline 
and 6-weeks after sodium 
bicarbonate administration
Baseline
6-weeks

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• 
Age ≥ 21 years 
• 
Serum bicarbonate 22-27 mEq/L on 2 separate measurements 
(at least 1 day apart)  
• 
CKD stage 3B or 4 at time of screening (eGFR 15-44 
ml/min/1.73m2)  
• 
Blood pressure <140/90 mm Hg prior to randomization 
• 
BMI < 40 kg/m2 (FMD measurements can be inaccurate in 
severely obese patients).  
• 
Able to provide consent 
• 
Stable anti-hypertensive regimen for at least one month prior to 
randomization 
• 
Not taking medications that interact with agents administered 
during experimental sessions (e.g. sildenafil interacts with 
nitroglycerin). 
 
      
• 
Significant comorbid conditions that lead the investigator 
to conclude that life expectancy is less than 1 year 
• 
Use of chronic daily oral alkali within the last 3 months 
(including sodium bicarbonate, calcium carbonate or 
baking soda) 
• 
Uncontrolled hypertension 
• 
Serum potassium < 3.3 or ≥ 5.5 mEq/L at screening 
• 
New York Heart Association Class 3 or 4 heart failure 
symptoms, known EF ≤30%, or hospital admission for 
heart failure within the past 3 months 
• 
Factors judged to limit adherence to interventions 
• 
Anticipated initiation of dialysis or kidney transplantation 
within 12 months 
• 
Current participation in another research study 
• 
Pregnancy or planning to become pregnant or currently 
breastfeeding 
• 
Chronic use of supplemental oxygen 
 
• 
Started on immunosuppression in the past 3 months 
• 
Metal implant or implanted electrical device (patient will be 
unable to get MRI) 
 
Rigorous Experimental Design. A 12-month randomized, placebo-controlled, double-blinded study with 
sodium bicarbonate will be conducted. The study will include 5 phases: screening, run-in, baseline, 
randomization and follow-up. 
• 
Screening: Subjects will undergo screening for inclusion/exclusion criteria during a 1-2 week period.  
• 
Run-in: A 1-month run-in period will occur if patients do not meet the BP goal of <140/90 mmHg. The 
rationale for this run-in phase is to achieve a stable antihypertensive regimen and BP <140/90 mmHg, such 
that changes in antihypertensive agents throughout the course of the study are minimal. This will allow for 
better isolation of the effect of bicarbonate on FMDBA, aPWV and LVMI. During the run-in phase, an up-
titration of patients current angiotensin converting enzyme inhibitor or angiotensin receptor blocker to their 
maximum approved dose or other antihypertensive medication(s) will occur to reach a target BP of  
<140/90 mmHg by their primary nephrologist or PCP. The duration of the run-in phase will be 4 weeks with 
weekly visits to achieve the target BP. The PI will contact the primary nephrologist/PCP of the patient if the 
BP is not at goal and discuss the need for medication changes. A BP <140/90 mmHg is the standard of 
care for patients with CKD, hence we do not anticipate an issue with the primary nephrologist or PCP 
making changes to the BP regimen.   If the patient is not able to achieve a BP of <140/90 mmHg during this 
period, the participant will not be included in the study. This overall approach will allow for inclusion of the 
typical population of patients with CKD 3-4 and increase the generalizability of our expected results.  
• 
Baseline: During the baseline phase FMDBA, aPWV, LVMI, serum basic chemistry panel, plasma AII, 
aldosterone, ET-1, serum T50, venous blood gas, and 24-hour urine collection measurements will be 
performed in all participants that are able to control their BP as described above. 
• 
Randomization: Participants will be randomized with a 1:1 allocation ratio to treatment and placebo group 
using block randomization. List of randomization will be generated by the study statistician and sent to the 
study pharmacist (Belmar Pharmacy, Denver, CO) blinded to the PI. Study investigators, healthcare 
providers, participants, data collectors, outcome adjudicators and data analysts will be blinded to treatment 
assignment.  
• 
Follow-up: The follow-up schedule includes: 
o 1 month: 1) remote or in-person safety visit (basic chemistry panel, adverse event assessment, 
gastrointestinal (GI) symptoms questionnaire, BP, pill compliance); 2) optional outcome measures: 
FMDBA, plasma AII, aldosterone, ET-1, and serum T50. Of note, aPWV will not be measured at 1 
month as it is unlikely to change after only 4 weeks of treatment. 
o 3, 6 and 9 months: safety visit (basic chemistry panel, adverse event assessment, GI symptoms 
questionnaire, BP, pill compliance).  
o 6 months: in addition to the safety visit, outcome measures: FMDBA, aPWV, plasma AII, aldosterone, 
ET-1 and serum T50 and 24-hour urine collection. 

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o 12 months: 1) Adverse event assessment, GI symptoms questionnaire, BP, pill compliance; 2) 
outcome measures: FMDBA, aPWV, LVMI, serum basic chemistry panel, plasma AII, aldosterone, ET-
1, serum T50, venous blood gas, and 24-hour urine collection. 
 
4. Study Drug Dosing. The study drugs (bicarbonate and the matched placebo) will be prepared by Belmar 
Pharmacy and will be identical in size, color, shape and taste. Each sodium bicarbonate capsule contains 7.7 
mEq of bicarbonate and 178 mg of sodium. The matching placebo capsule will contain cornstarch. Belmar 
Pharmacy will bottle the capsules and label the bottles with code numbers to maintain the study’s double blind 
and ship the bottles directly to the investigative site.  
  
a) Sodium bicarbonate: Subjects randomly assigned to sodium bicarbonate therapy will receive 0.5 mEq/kg-
lean body weight (LBW)/day for the entire 12 months. Participants will take ½ the daily dose in the morning and 
the other ½ in the evening. The number of capsules will be rounded to the nearest whole capsule. To reduce pill 
burden and increase compliance the maximum number of pills per day will be six.  
 
Rationale for sodium bicarbonate dose: A dose of 0.5 mEq/kg-LBW/day has been shown to be safe and 
effective for treatment of metabolic acidosis in patients with CKD.75,92 Previous studies using this dose of sodium 
bicarbonate have not reported significant changes in edema, body weight or BP.75,76,92 In our preliminary data, 
sodium bicarbonate administration was not associated with an increase in BP or fluid gain in patients with CKD 
stage 3-4. Additionally, we will dose sodium bicarbonate based on LBW, not actual body weight. The volume of 
distribution of bicarbonate is approximately that of total body water. Total body water is dependent on lean body 
mass. We will use the following equations to determine LBW93: 
 
LBW (kg)male=      9270 x Wt 
 
 
LBW (kg)female=      9270 x Wt 
  
       6680 + (216xBMI)  
 
 
 
8780 + (244xBMI) 
 
b) Placebo: Subjects randomly assigned to placebo will take the same number of capsules as if they were 
assigned to receive 0.5 mEq/kg-LBW/day of sodium bicarbonate. Participants will take ½ the daily dose in the 
morning and the other ½ in the evening. The number of capsules will be rounded to the nearest whole capsule. 
To reduce pill burden and increase compliance the maximum number of pills per day will be six. 
 
Rationale for placebo: A placebo group is necessary to successfully complete our aims. If a placebo group 
were not included both the investigators and participants would know that they are receiving sodium bicarbonate, 
which could influence medical management and perception of side effects in the study. It is not standard of care 
to give sodium bicarbonate therapy when the serum bicarbonate is >22 mEq/L in CKD. Although unlikely in this 
12-month study, serum bicarbonate may fall due to natural progression of CKD, particularly in the placebo group. 
As discussed in the safety section (see section 7), rescue therapy with open-label sodium bicarbonate will be 
initiated if the serum bicarbonate falls below 20 mEq/L on two consecutive measurements.  
 
5. Rationale for study duration. The exact duration necessary for improving vascular function and LVMI in 
patients with CKD is unclear. From the study teams experience with other interventional studies evaluating 
vascular function, changes in FMDBA can be seen within 4-6 weeks (see preliminary data) and changes in aPWV 
can be seen after 6 months. We are proposing multiple follow-up measures of FMDBA (1 month (optional), 6 
months and 12 months) and aPWV (6 months and 12 months) to determine short-term or long-term effects of 
bicarbonate. Changes in LVMI require longer periods of treatment and most published data use an intervention 
period of 6 months to 1 year. Accordingly, we propose to measure LVMI at 12 months.  
Study 
Population 
Measure 
Study Duration 
Hayoz (2012)94 
Postmenopausal women (n-125) 
aPWV 
38 weeks 
Frimodt-Moller (2012)95 
CKD stage 3-4 (n=67) 
aPWV 
6 months 
Kao (2011)96 
CKD stage 3 (n=67) 
LVMI and FMDBA 
9 months 
Alkaishi (2013)97 
CKD stage 4 (n=206) 
LVMI 
48 weeks 
Ayus (2005)98 
CKD stage 4 (n=101) 
LVMI 
6 months 
 
7. Safety monitoring 
• Expected adverse events: Sodium bicarbonate therapy may cause bloating, flatulence and abdominal 
discomfort. Although previous studies using similar doses of sodium bicarbonate have not reported significant 
changes in edema, body weight or BP,75,76,92 sodium bicarbonate may cause edema to develop or worsen 
thereby increasing BP. Previous studies suggest fluid retention is greater when sodium is accompanied by the 
chloride anion rather than the bicarbonate anion.99 As shown in our preliminary data, sodium bicarbonate did 

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not result in increased BP. Sodium bicarbonate also has the potential for causing metabolic alkalosis and 
hypokalemia if it is retained rather than excreted in the urine. These expected adverse events will be monitored 
during the course of the study and in general, can be medically managed by adjusting antihypertensive and/or 
diuretic agents, providing potassium replacement and by dietary changes. Of note, none of these adverse 
events were observed in our short-term pilot study. 
• 
Dose reduction and discontinuation: 
• 
Serum bicarbonate >28 mEq/L: The intervention dose (study drug) will be reduced by 50% by the PI and 
diuretics will be adjusted as appropriate by the primary nephrologist or PCP. The PI will contact the 
primary nephrologist or PCP by phone or email and discuss changes in diuretics. The participant will 
return for a visit one week later to have serum chemistries rechecked. If the bicarbonate remains >28 
mEq/L the intervention will be stopped by the PI and the participant will have serum bicarbonate 
measured weekly until it is <28 mEq/L. Plasma ionized calcium will be checked if bicarbonate is >30 
mEq/L at any visit since an increase in pH can decrease the ionized calcium concentration.100,101 
Management of low ionized calcium will be at the discretion of the PI based on symptoms reported by 
the patient. The PI will contact the primary nephrologist or PCP if she believes calcium supplementation 
is necessary and the primary physician will order the medication.  
• 
Systolic blood pressure ≥ 160 or diastolic blood pressure ≥ 80 mmHg: Potential reasons for uncontrolled 
BP, such as poor compliance or running out of medications will be evaluated and managed appropriately. 
If an identifiable cause is not found, the PI will contact the primary nephrologist or PCP to increase anti-
hypertensive medications and/or diuretics. The participant will return 1 week later for follow-up. If BP 
remains >160/80 mmHg at the second visit, the PI will again contact the primary nephrologist or PCP for 
medication changes and the intervention dose (study drug) will be reduced by 50% by the PI. The 
participant will return 1 week later. If BP remains unchanged at the third visit, the intervention will be 
stopped by the PI and the PI will contact the primary physician for escalation of medications. Participants 
will continue to have PRN visits weekly until BP is <160/80 mmHg.  
• 
Serum potassium < 3.0 mEq/L: The intervention dose will be reduced by 50% by the PI and the PI will 
contact the primary nephrologist or PCP to discuss adjusting diuretics as appropriate and prescribing 
potassium replacement. The participant will return 1 week later for repeat labs. If serum potassium 
remains < 3.0 mEq/L, the intervention will be discontinued by the PI. The participant will return weekly 
until serum potassium is > 3.0 mEq/L. 
• 
Severe edema: If in the opinion of the PI severe edema (4+) is present and another etiology cannot be 
identified the dose of the intervention will be reduced by 50% and the PI will contact the primary 
nephrologist or PCP to make adjustments to diuretics. If fluid retention remains severe at follow-up visits, 
the intervention (study drug) will be discontinued.  
• 
Rescue therapy with oral sodium bicarbonate: Rescue therapy with open-label sodium bicarbonate will 
be initiated by the PI if serum bicarbonate is <20 mEq/L on 2 consecutive measurements at least 1 week 
apart since a level <20 mEq/L is associated with adverse outcomes. In this instance, open-labeled sodium 
bicarbonate will be given to target serum bicarbonate of 20-22 mEq/L. Participants will not discontinue 
study medications if open-labeled sodium bicarbonate is prescribed.  
 
8. Data Collection 
• 
Demographics, medical history and physical examination will be performed at screening and baseline visit.  
• 
Circulating measures: Subjects will report fasted for standard blood chemistry analysis at baseline, 1, 3, 6, 9 
months and end of study. A venous blood gas (for pH and PCO2) will be obtained at baseline and end of study 
to get a more complete description of the acid-base status of the participant. To assess participant’s positive 
acid balance we will collect 24-hour urines at baseline, 6 months and end of study to measure net acid 
excretion and net endogenous acid production. A urine pregnancy test will be performed if clinically indicated 
at the screening visit. 
• 
Outcome measures: FMDBA will be performed at baseline, 1 month (optional), 6 months and end of study. 
Aortic PWV will be performed at baseline, 6 months and end of study. LVMI will be performed at baseline 
and end of study. Plasma will be collected for measurement of AII, aldosterone and ET-1 and serum will be 
collected for measurement of T50, at baseline, 1 month (if patient has in-person visit), 6 months and end of 
study.  

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• 
Other circulating markers of calcification: In addition, will measure serum fetuin-A (inhibitor of VC); serum 
calcium (promoter of VC); serum phosphate (promoter of VC); inflammatory markers (promoters of VC): 
serum C-reactive protein and cytokine 12 panel (IL-2, IL-4, IL-5, IL-6, IL-8, IL-10, IL-13, Interferon gamma, 
Interleukin 2 Receptor, Interleukin 1 beta, tumor necrosis factor); and markers of bone metabolism (serum 
parathyroid hormone, bone alkaline phosphatase, beta C-terminal telopeptide).  These markers will be 
measured at baseline, 6 months and end of study. 
• 
Resting BP: Arterial BP will be measured in triplicate while seated at rest using an automated oscillometric 
machine (Dinamap) at all in person study visits. 
• 
Measures of adherence and safety: 
o Pill counts will be assessed at the quarterly visits and end of study to document subject adherence. 
o A GI symptoms questionnaire will be performed to assess tolerability of the intervention monthly 
(either via telephone or at an in person visit). Participants will be asked to rate symptoms of nausea, 
bloating, and diarrhea. 
o Adverse event assessment will be performed monthly either via telephone or at an in person visit. 
Additional telephone calls and PRN follow-up visits will occur at the discretion of the PI. 
 
 
Table of Detailed Visits 
 
 
Screening 
Visit 
Run-in period 
 
 
Baseline Period 
Follow-up Period 
Month 1 
(in-person or 
remotely)                  
 Follow-up Period 
Month 3, 6, 9 
Follow-up Period 
Month 12 
Medical history 
and physical 
examination 
Height, weight, 
blood pressure, 
medication 
review 
 
Height, weight, 
blood pressure, 
medication review 
 
Height, weight, 
blood pressure, 
medication review 
 
Height, weight, 
blood pressure, 
medication review 
 
Height, weight, 
blood pressure, 
medication review 
 
Informed 
consent 
Titration of 
medications if 
blood pressure 
not at goal of < 
130/80 mmHg 
IV catheter, blood 
draw, 24-hour 
urine collection 
IV catheter, blood 
draw, urine 
collection (optional) 
Blood draw, urine 
collection 
IV catheter, blood 
draw, 24-hour urine 
collection 
Blood draw and 
urine collection 
 
Blood vessel 
function and 
nitroglycerin 
Blood vessel 
function and 
nitroglycerin 
(optional) 
Adverse events 
assessed 
Blood vessel 
function and 
nitroglycerin 
Pregnancy test 
if indicated 
 
Aortic pulse wave 
velocity 
measurement 
Adverse events 
assessed 
Pill count 
Aortic pulse wave 
velocity 
measurement 
 
 
Cardiac MRI 
Pill count 
*6 month visit only: 
IV catheter, blood 
draw 
Blood vessel 
function and 
nitroglycerin 
Aortic pulse wave 
velocity 
measurement and 
24-hour urine 
collection 
Cardiac MRI 
 
 
Distribution of 
study drug 
 
 
Adverse events 
assessed 
 
 
 
 
 
Pill count 

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9. Outcome Measures.  
a) Primary Outcomes 
• 
FMDBA: Brachial artery FMDBA will be determined using high-resolution ultrasonography (Toshiba Xario 200) 
as described originally by Celermajer et al.102 and more recently by Dr. Jablonski.103,104 FMDBA will be 
measured at baseline, 1 month, 6 months and 12 months. ECG-gated end-diastolic ultrasound images and 
Doppler flow of the brachial artery will be acquired during baseline and FMDBA conditions. For FMDBA, 
reactive hyperemia will be produced by inflating a pediatric BP cuff around the forearm to 250 mmHg for 5 
minutes followed by rapid deflation. Brachial artery endothelium independent dilation (EID) will be determined 
by measuring brachial artery dilation for 10 minutes after administration of sublingual nitroglycerin (0.4 
mg).104-107 A commercially available software package (Vascular Analysis Tools 6.0 Medical Imaging 
Applications, LLC, Iowa City, IA) will be used to concurrently acquire ECG-gated brachial artery diameters. 
As recently recommended108 brachial artery dilation will be determined as the mm and % change from 
baseline diameter.104-108 Doppler blood flow velocity will be obtained at baseline and for 2 minutes after cuff 
release. Shear rate will also be calculated, and if group- or condition- differences exist, FMDBA will be adjusted 
accordingly.108-110 Of note, the PI of this proposal has already completed vascular measurements in 128 
patients with CKD stages 3B-4 and thus has extensive experience with these measurements (K23 
DK087859). The coefficient of variation for baseline and peak brachial diameter in our laboratory is 0.3% and 
0.6%, respectively.104 
• 
Large Elastic Artery Stiffness and Compliance: Aortic PWV, a measure of large elastic artery stiffness, 
will be determined as described by Seals and colleagues111,112 at baseline, 6 months and 12 months. Briefly, 
transcutaneous custom tonometers (Noninvasive hemodynamics Workstation, Cardiovascular Engineering 
Inc., Norwood, MA) will be positioned at the aorta and femoral artery to measure PWV. Femoral and carotid 
compliance, also described previously by Seals et al. will be measured non-invasively using simultaneous 
high-resolution ultrasonography and applanation tonometry of the artery.111,112 
 
b) Justification for primary outcomes: As discussed above, EDD and aPWV are key pathophysiological 
antecedents to LVH in patients with CKD. FMDBA is a the most common, key, non-invasive technique used 
to assess EDD and aPWV is the gold standard measurement of arterial stiffness. Evaluating these outcomes 
will allow us to identify the intermediate vascular mechanisms by which bicarbonate administration may 
reduce the risk of CVD in patients with CKD. The PI and University of Colorado investigative team have 
expertise in these vascular function measurements.103 
 
c) Secondary Outcomes 
• 
Left Ventricular Mass: LVMI will be measured using gadolinium-free non-invasive cardiac MRI at baseline 
and 12 months. Cardiac MRI is the gold standard way to measure LVMI.113 Cardiac MRI will be performed 
on 3.0 T imaging system with cardiac sequence package using an electrocardiograph-gated, breath-hold, 2-
dimensional, cardiac stead state free precession imaging for assessing ventricular volumes and function. All 
measurements will take place at the University of Colorado Brain Imaging Center, a research-dedicated 
facility with a 3 Tesla whole-body MRI scanner and a 3d/cardiac workstation for post-processing and 
calculation of LVMI. We will assess LVMI, LV end-diastolic and end-systolic volumes, relative wall thickness, 
left atrial size and ejection fraction. Transmitral flow will be measured to further quantify diastolic dysfunction. 
LVMI will be calculated by normalizing LVM to height to the 2.7th power.114 LVM indexed to height has been 
strongly linked to outcomes in the CKD population.115 Dr. Nayana Patel (see letter of support), an experienced 
radiologist, will be reviewing the scans for safety and assessment of LVMI. 
• 
Plasma angiotensin II, aldosterone and endothelin-1: Plasma AII, aldosterone and ET-1 will be measured 
by Dr. Jan Simoni. Plasma AII will be measured with Cayman EIA Kit, Cat No. 589301 (Cayman Chemical, 
Ann Arbor, MI). Plasma aldosterone will be measured with Cayman EIA Kit-Monoclonal, Cat (Cayman 
Chemical, Ann Arbor, MI). Plasma ET-1 will be measured with Enzyme Immunoassay Kit (Cayman Chemical, 
Ann Arbor, MI) after extraction using Bound Elut C18 columns (Varian, Harbor City, CA). Dr. Simoni has 
extensive experience with these plasma tests and has successfully measured them in CKD populations.4-
6,52,58 
• 
Serum calcification propensity test:  A serum calcification propensity test (T50 assay) will be measured by 
Dr. Andreas Pasch using a Nephelostart nephelometer (BMG Labtech, Offenburg, Germany), a label-free 
96-well plate-based assay that measures the conversion of primary to secondary CPPs by detecting the 
time-resolved changes of laser light scattering (nephelomtery) associated with it.67 Dr. Pasch developed this 

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novel test of calcification and currently has the only laboratory in the world that performs the test. The 
analytical CV of a pooled serum precipitating at 270 minutes is 8.3%.67 
 
d) Justification for secondary outcomes: 1) LVH is very common in patients with CKD and is the strongest 
predictor of cardiovascular mortality in CKD patients. Cardiac MRI is the gold standard measurement of 
LVMI. 2) AII, aldosterone and ET-1 increase with acid retention and are likely contributors to arterial 
dysfunction, LVH and VC. The long-term effect of alkali therapy on plasma AII, aldosterone and ET-1 in CKD 
has not been evaluated. 3) The effect of alkali therapy on VC is unclear. We will measure T50, a novel test 
that measures the overall calcification propensity of serum. T50 better defines the future calcification risk 
related to common abnormalities of mineral metabolism factors and improves prediction of calcification 
beyond single protein measurements. T50 predicts aortic stiffness, which is strongly linked to VC.19-21  
 
10. Power Calculations  
a) Aim 1: Effect sizes were estimated for the primary endpoints of FMDBA and aPWV based on published data 
of a similar population. We hypothesize that participants randomized to the bicarbonate group will have an 
improvement (i.e., increase) in FMDBA at 12 months, while those in placebo will have a decrease in FMDBA. We 
will compare change (from baseline to 12 months) in FMDBA between the two groups. A previous study of 
paricalcitol vs. placebo in CKD stage 3-4116 showed a between group difference of 1.8% in changed FMDBA with 
95% CI 0.3-3.1% after 12 weeks. Our preliminary data showed a between group difference (bicarbonate vs. 
control) of 1.6% in changed FMDBA with 95% CI 0.2-2.9% after 6 weeks. Assuming a standard deviation of 
change of 0.8%, 54 patients in the placebo group and 54 patients in the bicarbonate group achieves 99% power 
to detect a 1.5% difference among the means (which is a clinically meaningful difference) using the two sample 
t-test with a two-sided 0.025 significance level (i.e. 5% significance level after Bonferroni correction for 2 
outcomes) for intent-to-treat (ITT) analysis. It would also achieve 99% power to detect the same effect size in 
per-protocol analysis (n=45 per group allowing for 15% attrition). We hypothesize that participants randomized 
to the bicarbonate group will have no change or a decrease in arterial stiffness measured by aPWV at 12 months, 
while those in placebo will have an increase in stiffness. We will compare change (from baseline to 12 months) 
in aPWV between the two groups. In previous studies of CKD patients with comparable kidney function, the 
mean (SD) increase in aPWV was 1.1 ± 1 m/s over a 12 month period.117,118 Assuming a common standard 
deviation within a group of 1.5 m/s,117,118 54 patients in each group will provide 88% power to detect a 1.0 m/s 
difference among the means (which is a clinically significant difference) using the two sample t-test with a two-
sided 0.025 significance level (i.e. 5% significance level after Bonferroni correction for 2 outcomes) for ITT 
analysis. It would also achieve 80% power to detect the same effect size in per-protocol analysis (n=45 per group 
allowing for 15% attrition).  
 
b) Aim 2: Effect sizes were estimated for the outcome of LVMI (normalized to height to the 2.7th power) based 
on published data of longitudinal changes in LVMI.119,120 We hypothesize that participants randomized to the 
bicarbonate group will have a decrease in LVMI at 12 months whereas those in placebo will have no change or 
an increase in LVMI. We consider 5-g of between-group difference in absolute LV mass as clinically important 
based on previous studies 119 where 10-g was considered for 2 years study duration, implying a mean between 
group-difference of 1.2 in LVMI, given mean height of 1.70 m. We further estimate the SD of the change in LVMI 
to be 1.8 based on information provided in the same study.119 Hence, 54 patients in each group will provide 93% 
power to detect a significant 5-g difference in absolute LV mass or a 1.2 g/m2.7 difference in LVMI between the 
two groups at 12 months using a two sample t-test with a 0.05 significance level. 
 
c) Aim 3: We hypothesize that participants randomized to the bicarbonate group will have a decrease in plasma 
AII, aldosterone and ET-1 12 months whereas those in placebo will have no change or an increase.  Based on 
data from a small trial of alkali therapy in participants with CKD,4 we expect the mean ET-1 level to decrease by 
0.9 pg/mL with a SD of 0.4 pg/mL and the mean aldosterone level to decrease by 20 pg/mL with a SD of 10.1 
pg/mL from baseline to 12 months in the bicarbonate group. The planned sample size of 54 patients in each 
group will provide >95% power to detect the difference between the two groups. Based on published data in 
hypertensive patients with normal renal function,121 we expect the mean AII level to decrease by 30% from 
baseline to 12 months in the bicarbonate group. The planned sample size of 54 patients in each group will 
provide >95% power to detect the difference between groups. There is very limited data regarding change in T50 
levels in CKD patients. We hypothesize that the bicarbonate group will have an increase in T50 whereas the 
placebo will not change or decrease. Based on published data in CKD stage 3-4 patients,21 we expect the 

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baseline mean (SD) of T50 to be 329 (95) minutes. With a sample size of 54 patients per group, we have 95% 
power to detect a difference between groups if it is 0.7 SD of changed serum T50 from baseline (i.e. the effect 
size is 0.7) with a two-sided 0.05 significance level. 
 
11. Statistical Analysis 
• 
General consideration: The primary analysis will be conducted on ITT basis. Analysis of covariance 
(ANCOVA) with complete data will be the primary analysis for efficacy. Multiple imputation will apply because 
of missing data and sensitivity analysis will be conducted in various ways, including linear mixed effects 
model and pattern-mixture model approach. Compliance of intervention will be summarized using the number 
of pills taken as the proportion of planned number of pills. The association of compliance with each of the 
outcomes (FMDBA aPWV and LVMI) will be explored using multiple linear regression. Participants who 
receive rescue therapy will be analyzed in the ITT analysis but excluded from the per-protocol analysis. We 
will also analyze the data with and without adjustment for change in eGFR, exploring its potential effect. All 
analyses will be performed using SAS version 9.4 (SAS Institute, Cary, NC, USA).   
• 
Descriptive statistics: Descriptive statistics of baseline characteristics and outcomes variables will be 
provided for all enrolled participants; mean and standard deviation for continuous variable and proportion for 
categorical variable. Summaries will be provided for the full cohort and for subgroups defined by age, gender, 
and baseline kidney function. Highly-skewed variables may be transformed prior to statistical analyses to 
better approximate normality. Change over time in outcome variables will be presented by using appropriate 
charts and tables.  
• 
Analysis Plan for Aim 1: The goal of this aim is to compare changes from baseline to 12 months in FMDBA 
and aPWV between the two groups and ANCOVA will be used to test the difference. In all analyses, a p 
≤0.025 will be considered significant. Furthermore, we will investigate how FMDBA and aPWV change over 
time in one year by using longitudinal data analysis with mixed effect models. We will perform analysis of 
response profile in which we will assess the mean level of FMDBA and aPWV at all time points in each group 
and examine for differences between groups at each time point. In addition, will assess for an effect of the 
intervention vs. placebo prior to the end of study. We will also fit parametric curves if exploratory analyses 
find a curve pattern of change over time in FMDBA and aPWV. 
• 
Analysis Plan for Aim 2: The goal of this aim is to compare changes from baseline to 12 months in LVMI 
between the two groups and ANCOVA will be used to test the difference. In all analyses, a p ≤ 0.05 will be 
considered significant. 
• 
Analysis Plan for Aim 3: The goal of this aim is to compare changes from baseline to 12 months in plasma 
levels of AII, aldosterone and ET-1 and serum levels of T50 between the two groups and ANCOVA will be 
used to test the difference. In all analyses, a p ≤ 0.05 will be considered significant. 
 
12. Potential Problems and Alternative Strategies 
• 
Although subject recruitment and retention are always challenging, we should be able to complete the study 
in the proposed timeline given our groups excellent track record in recruiting and enrolling participants in 
clinical trials. The PI completed a randomized clinical trial of 128 patients with CKD stage 3B-4 and all patients 
were enrolled within 3 years (K23 DK087859).  
• 
We should have few difficulties with the proposed experimental procedures and protocols as they are already 
establised in the vascular laboratories at the University of Colorado Denver. The PI has extensive experience 
with the vascular function measurements outlined in this proposal and the investigative team has experience 
with performing cardiac MRIs in patients with CKD. 
• 
We recognize that alternative approaches exist for examining the effects of alkali therapy on CVD in patients 
with CKD. For example, one alternative would be to undertake a larger study to examine hard cardiovascular 
endpoints rather than the investigation proposed in the current application. However, our proposed study is 
the most cost-effective approach to obtain confirmation of the study hypotheses and to determine the 
endpoints to use in a future clinical outcomes trial. 
• 
We recognize that different dosages of sodium bicarbonate therapy can be used. However, the proposed 
dose in the current study has been shown to be safe and effective in treating metabolic acidosis in published 
reports and in our completed pilot study with CKD stage 3-4 patients. 

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• 
We acknowledge that T50 has not been validated as a measure of vascular calcification. However, aortic 
calcification is strongly associated with aPWV19,20 and reduced T50 is independently associated with 
progressive aortic stiffness in patients with CKD.21  
• 
Systolic BP is an important determinant of endothelial function, arterial stiffness and LVH and could be a 
theoretical confounder when interpreting the mechanisms by which alkali therapy improves EDD, aPWV and 
LVMI. However, we do not expect this to be an issue as all participants must have their BP controlled prior 
to entering the study. Patients will undergo a run-in phase to ensure their BP is controlled to <130/80 mmHg 
and to achieve a stable antihypertensive regimen, such that changes in antihypertensive agents throughout 
the course of the study are minimal. Additionally, we will adjust for BP if differences in BP control is observed 
between the groups. In our preliminary pilot study we did not see any differences in BP between the treatment 
and control conditions (see section 1c).  
• 
We acknowledge that there may be other potential mechanisms by which acid retention results in arterial 
dsyfunction. Acidosis induces inflammation (risk factor for arterial dysfunction)122 and net calcium and 
phosphate efflux from bone (risk factor for calcification).123 Hence, we will measure markers of inflammation 
(cytokine 12 panel (IL-2, IL-4, IL-5, IL-6, IL-8, IL-10, IL-13, Interferon gamma, IL-2 Receptor, IL-1 beta, tumor 
necrosis factor) and markers of bone metabolism (serum parathyroid hormone, bone specific alkaline 
phosphatase and beta C-terminal telopeptide). 
 
Optional Cognitive and Motor Function Testing 
Participants will be given the option to participate in optional cognitive and motor function testing on the consent 
form. Cognition refers to the mental processes involved in gaining knowledge and comprehension such as 
thinking, knowing, remembering, judging and problem-solving. Measurement of cognition is essential to study 
health and well-being. Motor function is the ability to use and control muscles and movements. Motor 
performance is indicative of physical health, burden of disease and long term health outcomes. It is also related 
to a person’s daily functioning and quality of life. No additional study visits will be needed. These function 
measures will be done at the baseline, 6-month and 12-month visits. They will be assessed with the NIH Toolbox 
tests. These tests will add approximately 38 minutes onto the study visits. There is no additional risk to the 
patients.  
 
 
1. Cognition. Cognitive function will be assessed using the NIH Toolbox computerized tests to evaluate 1) 
attention, 2) episodic memory, 3) working memory, 4) language, 5) executive function, and 6) processing 
speed.  Administering the NIH Toolbox cognitive battery will yield the following summary scores, in addition to 
individual measure scores: Cognitive Function Composite Score (‘g’ factor, or general cognitive ability based 
on performance of each subdomain), Fluid Cognition Composite Score (includes tests of attention, executive 
function, working memory, and processing speed) and Crystallized Cognition Composite Score (includes 
Picture Vocabulary and Reading Recognition measures).   
  
Cognitive and Motor Outcomes using NIH Tool Box 
 
Subdomain 
Assessment 
Cognitive 
Attention 
Flanker inhibitory control & 
Attention Test 
 
 
 
  
Episodic memory 
Picture sequence memory 
  
Working memory 
List sorting working memory 
  
Language 
Picture vocabulary 
  
  
Oral reading recognition 
  
Executive function 
Flanker inhibitory control 
  
  
Dimensional change card sort 
  
 
 
Motor 
Processing speed 
 
 
Dexterity 
Strength 
Pattern comparison 
 
 
9-Hole Pegboard Dexterity Test 
Grip Strength Test 

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NIH Toolbox Cognitive Domain: computerized tests will be administered at the Kidney Research center 
during the baseline, 6-month and 12-month visits.  
 
Attention (NIH Toolbox). Attention will be measured by the NIH Toolbox Inhibitory Control and Attention Test. 
The Flanker task measures both a participant’s attention and inhibitory control. The test requires the participant 
to focus on a given stimulus while inhibiting attention to stimuli (fish for ages 3-7 or arrows for ages 8-85) 
flanking it. Sometimes the middle stimulus is pointing in the same direction as the “flankers” (congruent) and 
sometimes in the opposite direction (incongruent). Scoring is based on a combination of accuracy and reaction 
time. 
  
Episodic Memory (NIH Toolbox). Episodic Memory refers to cognitive processes involved in the acquisition, 
storage and retrieval of new information and will be measured with the NIH Toolbox Picture Sequence Memory 
Test. The Picture Sequence Memory Test is a measure developed for the assessment of episodic memory. It 
involves recalling increasingly lengthy series of illustrated objects and activities that are presented in a 
particular order on the computer screen. The participants are asked to recall the sequence of pictures that is 
demonstrated over two learning trials; sequence length varies from 6-18 pictures, depending on age. 
Participants are given credit for each adjacent pair of pictures (i.e., if pictures in locations 7 and 8 are placed in 
that order and adjacent to each other anywhere – such as slots 1 and 2 – one point is awarded) they correctly 
place, up to the maximum value for the sequence, which is one less than the sequence length (if there are 18 
pictures in the sequence, the maximum score is 17, because that is the number of adjacent pairs of pictures 
that exist). 
  
Working Memory (NIH Toolbox). Working Memory refers to a limited-capacity storage buffer that becomes 
overloaded when the amount of information exceeds capacity and is measured by the NIH Toolbox List Sorting 
Working Memory Test. This test requires immediate recall and sequencing of different visually and orally 
presented stimuli. Pictures of different foods and animals are displayed with accompanying audio recording 
and written text (e.g., “elephant”), and the participant is asked to say the items back in size order from smallest 
to largest, first within a single dimension (either animals or foods, called 1-List) and then on 2 dimensions 
(foods, then animals, called 2-List). The score is equal to the number of items recalled and sequenced 
correctly. 
  
Language (NIH Toolbox). NIH Toolbox focuses on two aspects of language: vocabulary knowledge, which is 
fundamental to the growth of knowledge and which also has a very high association with overall intelligence, or 
what has been called the "g factor”, and oral reading skill, which reflects level and quality of prior educational 
experiences, and provides a fairly robust indication of verbal intelligence that is relatively undisturbed by many 
medical conditions that affect the brain. Vocabulary language will be measured by the NIH Toolbox Picture 
Vocabulary Test while oral reading will be measured by the NIH Toolbox Oral Reading Recognition Test. 
The NIH Toolbox Picture Vocabulary Test measures receptive vocabulary and is administered in a 
computerized adaptive format. The respondent is presented with an audio recording of a word and four 
photographic images on the computer screen and is asked to select the picture that most closely matches the 
meaning of the word. 
During NIH Toolbox Oral Reading Recognition Test the participant is asked to read and pronounce letters and 
words as accurately as possible. The test administrator scores them as right or wrong. The test is given in a 
computerized adaptive format. 
  
Executive Function (NIH Toolbox). Executive Function is the capacity to plan, organize, and monitor the 
execution of behaviors that are strategically directed in a goal-oriented manner and is measured by the NIH 
Toolbox Dimensional Change Card Sort Test (DCCS). DCCS is a measure of cognitive flexibility. Two target 
pictures are presented that vary along two dimensions (e.g., shape and color). Participants are asked to match 
a series of bivalent test pictures (e.g., yellow balls and blue trucks) to the target pictures, first according to one 
dimension (e.g., color) and then, after a number of trials, according to the other dimension (e.g., shape). 
“Switch” trials are also employed, in which the participant must change the dimension being matched. For 

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example, after 4 straight trials matching on shape, the participant may be asked to match on color on the next 
trial and then go back to shape, thus requiring the cognitive flexibility to quickly choose the correct stimulus. 
Scoring is based on a combination of accuracy and reaction time. 
  
Processing Speed (NIH Toolbox). Processing Speed is either the amount of time it takes to process a set 
amount of information, or, the amount of information that can be processed within a certain unit of time. It is a 
measure that reflects mental efficiency, and will be measured with the NIH Toolbox Pattern Comparison 
Processing Speed Test. This test measures speed of processing by asking participants to discern whether two 
side-by-side pictures are the same or not. Participants’ raw score is the number of items correct in a 90-second 
period. The items are designed to be simple to most purely measure processing speed.  
 
2. Motor. Motor function will be assessed using the NIH Toolbox tests to evaluate 1) dexterity and 2) strength.  
Dexterity (NIH Toolbox): Dexterity is the coordination of small muscle movements, which occur in body parts. 
Dexterity is measured by the NIH Toolbox 9-Hole Pegboard Dexterity Test. This simple test records the time 
required for the participant to accurately place and remove 9 plastic pegs into a plastic pegboard. The protocol 
includes 1 practice and 1 timed trial with each hand. Raw scores are recorded as time in seconds that it takes 
the participant to complete the task with each hand (a separate score for each).  
 
Strength (NIH Toolbox): Strength refers to a muscle’s ability to generate force against physical objects. 
Measuring hand grip shows how strong ones hand grip is, which in turn provides a good approximation of 
overall muscle strength. Strength is measured by the NIH Toolbox Grip Strength Test. Participants are seated 
in a chair with their feet touching the ground. With the elbow bent to 90 degrees and the arm against the trunk, 
wrist at neutral, participants squeeze the Jamar Plus Digital dynamometer as hard as they can for a count of 
three. The dynamometer provides a digital reading of force in pounds. A practice trial at less than full force and 
1 test trial are completed with each hand.  
 
Optional Additional Study Visit after Treatment is Complete 
Participants will be given the option to participate in an additional study visit that occurs after they have 
completed 12 months on study drug. Participants will return 6 weeks after the 12-month visit. The purpose of 
this visit is to examine how vascular function, laboratory and urine markers change after being off the study 
medication for 6 weeks. This visit will last approximately 1.5 hours and the following will occur: 
• 
Vital signs, history and physical examination including medication history. 
• 
IV catheter will be placed and blood will be collected to measure a basic metabolic panel and venous 
blood gas 
• 
Additional blood will be collected to examine inflammatory markers to see if changes persist after 
discontinuing treatment 
• 
Participants will return a 24-hour urine collection. This sample will be used to measure 24-hour urine 
electrolytes, ammonium, pH, creatinine, and urea nitrogen. 
• 
Vascular endothelial function will be measured as described above.  
 
Participants will not be on study medication during this 6-week period. The only risk associated with this visit 
includes the blood draw and the use of nitroglycerin for measurement of vascular function. Participants will be 
given the option to consent for this additional study visit. They will receive $25 if they complete this visit.  
 
Protection of Human Subjects 
Sources of Research Material: This is a prospective study of newly recruited human subjects with 
CKD stage 3-4. The data collected will be used exclusively for research purposes. All subject identities and 
records will remain strictly confidential. We will obtain brachial artery flow mediated dilation, aortic pulse wave 
velocity, and left ventricular mass measurements, blood samples and demographic and clinical data, including 
detailed medical and medication histories. 
 
c) Potential Risks: We see no psychological, social, or legal risks beyond those of participation in health 
related research in general. The potential physical risks of participating in the proposed experiments are 
reasonably small. The procedures have been used previously by the team of investigators without 

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complications. Importantly, all of the procedures will be performed in the Clinical Vascular Physiology 
Laboratory at the University of Colorado Denver and in the Brain Imaging Center MRI lab at University of 
Colorado Denver, both of which have on-site full-time physician supervision, nursing, and other clinical and 
research support personnel, safety equipment and established emergency procedures. Moreover, a Data 
Safety Monitoring Board (DSMB) will be appointed to oversee this ancillary study.  
 
The risks associated with the experimental protocols include: 
 
• 
Venous catheter: discomfort associated with insertion of the needle; local bleeding and a small 
hematoma (~10% of cases); risk of infection of a hematoma or significant external blood loss (<1 in 
1000), risk of fainting. Subjects with CKD may have plans in place for future vascular access for 
hemodialysis and thus we will place the venous catheter in the arm not designated for future vascular 
access.  
• 
Endothelium Dependent Dilation (FMD): inflating the blood pressure cuff below the elbow during this 
procedure may cause a mild to moderate intensity “pins and needles or numbing” sensation that goes 
away as soon as the cuff is deflated. Since CKD patients may need future vascular access for 
hemodialysis, the FMD measurement will be done in the arm not designated for future vascular access 
for dialysis. 
• 
Endothelium Independent Dilation (EID): Sublingual Nitroglycerin is used to determine EID. 
Nitroglycerin may cause a slight decrease in arterial blood pressure. The subject may experience minor 
symptoms such as lightheadedness, tingling in the tongue and in the arms and legs, light headaches, 
fainting and/or increased heart rate. Nitroglycerin will not be given to any subject with a systolic blood 
pressure less than 100 mm Hg and/or heart rate <60 or >100 on the day the measurements are 
performed. The dose of Nitroglycerin used is considered safe and is used in patient populations to 
relieve angina.  
• 
Magnetic Resonance Imaging: The risk of performing cardiac MRI is minimal. The magnetic field 
generated within the MRI is not harmful but can cause metal within the body to heat up or electronics to 
stop working. All subjects will be questioned regarding the presence of metal or electronic devices 
inside their body (e.g. pacemakers, etc). All subjects with either metal implants or implanted electronic 
devices will be excluded from the study. As the MRI is a small round tube, it may make subjects who 
experience claustrophobia uncomfortable. Thus, all consenting subjects who experience non-severe 
claustrophobia will be asked to have their private physician prescribe a suitable medication to control 
their anxiety associated with the procedure. These subjects will be instructed to bring a designated 
driver with them to the MRI visit. The most common minor side effect of having a MRI exam is flashing 
lights in the eyes. This is caused by the magnetic waves and is not harmful. Some people also 
experience warmth and reddening of the skin, which usually goes away after a few minutes. For all 
female participants of childbearing age, a pregnancy test prior to MRI will be required. All scans will be 
performed without gadolinium given the risk of nephrogenic systemic fibrosis in patients with CKD. 
• 
Medications: With any medication used in testing, there is small risk of an allergic reaction. Reactions 
reported with the use of the specific medications proposed for use include: 
o Sodium bicarbonate is an FDA approved medication for the treatment of metabolic acidosis 
and as an antacid. It is extremely well tolerated. The main side effect of oral sodium bicarbonate 
is flatulence and gastric distension. Metabolic alkalosis and weight gain from water retention can 
also occur but are rare. Serious reactions are uncommon with oral administration of the drug but 
include edema, CHF exacerbation, hypertension, hypernatremia, hypokalemia and pulmonary 
edema. Patients will be monitored monthly for side effects (see data and safety monitoring plan 
below). 
o Nitroglycerin may cause a slight decrease in arterial blood pressure, minor symptoms such as 
lightheadedness, tingling in the tongue and in the arms and legs, headaches, fainting and/or 
increased heart rate. The dose of nitroglycerin used is considered safe in the proposed 
population and is also used in patient populations to relieve angina.  
 
There are no alternative methods that would provide the same type and accuracy of information as the state 
of-the art procedures proposed in this application. 

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2. Adequacy of Protection Against Risks 
a) Recruitment and Informed Consent: We will use the recruitment and adherence strategies and 
experience previously implemented by the team of investigators as well as the services of the Health Data 
Compass office. Dr. Kendrick has successfully recruited patients with different etiologies of CKD to clinical 
trials for several years. Patients for the study will be recruited from nephrology clinics at the University of 
Colorado Hospital and Denver Health Hospital with access to over 2000 CKD patients.  
 
Written informed consent will be obtained at enrollment using a standardized form approved by the Research 
Subject Advocate that provides appropriate information about the study and the potential risks and benefits. 
The subject will then read the consent form and the investigator will answer any questions that the subject may 
have prior to obtaining the subject’s written consent. The consent form will then be signed by both the subject 
and the investigator as documentation of consent. A copy of the signed consent form will be given to the 
subject. All of the proposed procedures and protocols will be reviewed and approved by the University of 
Colorado Institutional Review Board (COMIRB). 
 
b) Protection against Risk: To ensure that participants’ confidentiality is maintained, each participant will be 
assigned a unique study identification number and will be tracked through the study by this number. Only the 
PI and Study Coordinator will maintain the code linking study identification numbers to specific participants. 
When data generated from any study is shared, only de-identified information will be exchanged. No protected 
health information will be sent to any collaborators or be used in any publications of the findings. 
 
The potential general risks of the proposed ancillary study measurements will be minimized by: 
• 
Using only safe, well-established procedures, with only qualified and experienced personnel performing 
the procedures. 
• 
Ensuring constant personal monitoring of each experimental session by the investigators and clinical 
staff. 
• 
Providing appropriate clinical supervision and emergency equipment and medications  
• 
All blood pressure, blood draws and FMDBA measurements will be performed in the arm not designated 
for future vascular access for dialysis. 
• 
Risks associated with sublingual Nitroglycerin will be minimized by not administering Nitroglycerin to 
subjects with systolic blood pressure <100 mm Hg and/or heart rate <60 or >100. During Nitroglycerin 
administration, heart rate and blood pressure will be monitored every 2 minutes for signs and 
symptoms of hypotension. Additionally, an intravenous catheter (dorsal aspect of the hand) will be in 
place for administration of fluid or drugs in the rare event of symptoms due to hypotension or vasovagal 
bradycardia. 
• 
Safety monitoring by a data safety monitoring board (DSMB) 
• 
Evaluation for adverse events on a monthly basis either through telephone calls or in person visits. 
 
3. Potential Benefits of the Proposed Research to the Subjects and Others: Because the risks of 
participating in this study are relatively small, the risk-to-benefit ratio is relatively small. Subjects will receive 
benefits associated with overall knowledge of their health from the extensive testing performed for screening 
purposes and the established subject characteristics (i.e. blood pressure, blood chemistries, etc.). The findings 
we will generate will answer important questions about bicarbonate administration in patients with CKD and 
help investigators design future clinical trials in this population. Thus, the new knowledge generated from this 
proposal will yield potential benefit to CKD patients in general and to society as a whole.  
 
4. Importance of the Knowledge to be Gained: The new knowledge generated from this proposal will 
facilitate planning of future clinical trials in CKD that will aim to reduce the burden of CVD and premature death 
in this population. In addition, the proposed research should provide important insight into the mechanisms 
involved in any beneficial effects of bicarbonate administration on vascular function and left ventricular mass in 
patients with CKD.  
 
5. Data and Safety Monitoring Plan: To ensure the safety of subjects, they will need to meet rigorous 

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inclusion/exclusion criteria, including comprehensive health screening procedures. A data safety monitoring 
board (DSMB) including clinicians and a statistician (independent of the study investigators but part of the 
faculty at the University of Colorado School of Medicine) will be formed to assess potential adverse events. 
The data will be prepared by the DSMB statistician, ensuring the study statistician remains blinded until the 
final analysis. The DSMB will meet at least 1 time per year to review the protocol and will follow the guidelines 
established by the NIH National Center for Research Resources, which include: a) monitoring the progress of 
the protocol (e.g. reviewing subject recruitment, attrition and minority involvement) and the safety of research 
participants (e.g. reviewing unblinded data for safety); b) assuring compliance with requirements regarding the 
reporting of adverse events; c) assuring that any action that results in the temporary or permanent suspension 
of the protocol is reported to all of the appropriate monitoring bodies (IRB, NIH, etc.) and d) assuring data 
accuracy and protocol compliance. Any unexpected adverse events will be reported immediately to the 
Colorado Institutional Review Board, the funding I/C and the NIH Office of Biotechnology Activities. This study 
is not solidly considered as a confirmatory study and as such no interim analysis has been planned.   
 
• Expected adverse events: Sodium bicarbonate therapy may cause bloating, flatulence and abdominal 
discomfort. Although previous studies using similar doses of sodium bicarbonate have not reported significant 
changes in edema, body weight or BP,75,76,92 sodium bicarbonate may cause edema to develop or worsen 
thereby increasing BP. Previous studies suggest fluid retention is greater when sodium is accompanied by the 
chloride anion rather than the bicarbonate anion.99 As shown in our preliminary data, sodium bicarbonate did 
not result in increased BP. Sodium bicarbonate also has the potential for causing metabolic alkalosis and 
hypokalemia if it is retained rather than excreted in the urine. These expected adverse events will be monitored 
during the course of the study and in general, can be medically managed by adjusting antihypertensive and/or 
diuretic agents, providing potassium replacement and by dietary changes. Of note, none of these adverse 
events were observed in our short-term pilot study. 
• 
Dose reduction and discontinuation: 
• 
Serum bicarbonate >26 mEq/L: The intervention dose will be reduced by 50% and diuretics will be 
adjusted as appropriate. The participant will return for a visit one week later to have serum chemistries 
rechecked. If the bicarbonate remains >26 mEq/L the intervention will be stopped and the participant will 
have serum bicarbonate measured weekly until it is <26 mEq/L. Plasma ionized calcium will be checked 
if bicarbonate is >26 mEq/L at any visit since an increase in pH can decrease the ionized calcium 
concentration.100,101 Management of low ionized calcium will be at the discretion of the PI based on 
symptoms reported by the patient. 
• 
Systolic blood pressure ≥ 160 or diastolic blood pressure ≥ 80 mmHg: Potential reasons for uncontrolled 
BP, such as poor compliance or running out of medications will be evaluated and managed appropriately. 
If an identifiable cause is not found, the PI will increase anti-hypertensive medications and/or diuretics. 
The participant will return 1 week later for follow-up. If BP remains >160/80 mmHg at the second visit, 
medications will again be increased and the intervention dose will be reduced by 50%. The participant 
will return 1 week later. If BP remains unchanged at the third visit, the intervention will be stopped and 
medications will again be escalated. Participants will continue to have PRN visits weekly until BP is 
<160/80 mmHg.  
• 
Serum potassium < 3.0 mEq/L: The intervention dose will be reduced by 50%, diuretics will be adjusted 
as appropriate and potassium replacement will be prescribed. The participant will return 1 week later for 
repeat labs. If serum potassium remains < 3.0 mEq/L, the intervention will be discontinued. The 
participant will return weekly until serum potassium is > 3.0 mEq/L. 
• 
Severe edema: If in the opinion of the PI severe edema (4+) is present and another etiology cannot be 
identified the dose of the intervention will be reduced by 50% and diuretics will be adjusted. If fluid 
retention remains severe at follow-up visits, the intervention will be discontinued.  
• 
Rescue therapy with oral sodium bicarbonate: Rescue therapy with open-label sodium bicarbonate will 
be initiated if serum bicarbonate is <20 mEq/L on 2 consecutive measurements at least 1 week apart 
since a level <20 mEq/L is associated with adverse outcomes. In this instance, open-labeled sodium 
bicarbonate will be given to target serum bicarbonate of 20-22 mEq/L. Participants will not discontinue 
study medications if open-labeled sodium bicarbonate is prescribed.  
 
  

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