# Adherence to the 2019 AHA/ACC/HRS Focused Update of the 2014 AHA/ACC/HRS Guideline on the Use of Oral Anticoagulant Agents in Middle Eastern Patients with Atrial Fibrillation: The Jordan Atrial Fibrillation (JoFib) Study

Authors: Ayman J. Hammoudeh; Yousef Khader; Nazih Kadri; Eyas Al-Mousa; Yahya Badaineh; Laith Habahbeh; Ramzi Tabbalat; Hesham Janabi; Imad A. Alhaddad
Journal: International Journal of Vascular Medicine
 (2021)

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## Abstract

Background. There is a scarcity of studies that evaluate adherence to the utilization of guideline-recommended oral anticoagulant agents (OACs) in patients with atrial fibrillation (AF) in the Middle East. The Jordan Atrial Fibrillation (JoFib) Study evaluated baseline clinical profiles and the utilization of OACs, including vitamin K antagonists (VKAs) and direct OACs (DOACs), in patients with valvular AF (VAF) and nonvalvular AF (NVAF) according to the 2019 focused update of the 2014 AHA/ACC/HRS guidelines. Methods. Consecutive patients with AF were enrolled in 29 hospitals and outpatient clinics. The use of OACs was evaluated in patients with VAF and NVAF according to the prespecified guideline. Results. Of 2000 patients, 177 (8.9%) had VAF and 1823 (91.1%) had NVAF. A VKA was prescribed for 88.1% of the VAF group. In the NVAF group, 1468 (80.5%) of patients had a high CHA2DS2-VASc score, i.e., a score of ≥3 in women and ≥2 in men; 202 (11.1%) patients had an intermediate CHA2DS2-VASc score, i.e., a score of 2 in women and 1 in men; and 153 (8.4%) patients had a low CHA2DS2-VASc score, i.e., a score of 1 in women and 0 in men. Of patients with a high CHA2DS2-VASc score, 1204 (82.0%) received OACs, including DOACs for 784 (53.4%) and VKA for 420 (28.6%) patients. Among patients with an intermediate score, OACs were prescribed for 148 (73.3%) patients, including 107 (53.0%) who received DOACs and 41 (20.3%) patients who received VKA. In patients with a low score, OACs were omitted in 94 (61.4%) patients and prescribed for 59 (38.6%) patients. Multivariate analysis showed that age between 50 and 70 years, CHA2DS2-VASc score of ≥2, a diagnosis of stroke or systemic embolization, and nonparoxysmal AF were significantly associated with increased odds of OAC prescription. Conclusions. The current status of the utilization of OACs in Middle Eastern AF patients appears to be promising and is consistent with the 2019 focused update of the 2014 AHA/ACC/HRS guideline. This trial is registered with NCT03917992.


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## Body

## 1. Introduction

Atrial fibrillation (AF) is the most common sustained cardiac arrhythmia in adults [1, 2]. The most concerning health risks of AF are stroke and systemic embolization which are mostly preventable by the use of recommended oral anticoagulant agents (OACs) [3]. Vitamin K antagonists (VKAs) are the recommended OACs for patients with valvular AF (VAF) which accounts for 4% to 26% of all AF patients [4] and includes patients with moderate to severe rheumatic mitral valve stenosis and those with mechanical prosthetic valves [5]. On the other hand, direct OACs (DOACs) are recommended over VKA for patients with nonvalvular AF (NVAF) at high risk of stroke or systemic embolization [6, 7]. NVAF is associated with a wide range of etiologies including ischemic heart disease, hypertensive heart disease, nonrheumatic valve disease, and cardiomyopathies among other diseases [7]. There are significant heterogeneities in the etiology of AF, baseline clinical profiles of patients with VAF and NVAF, and utilization of OACs in different regions in the world due to discrepancies in age pyramids, prevalence of cardiovascular risk factors and comorbid diseases, and availability of and accessibility to emerging therapeutic agents [8–10]. Real-world AF registries have not only provided substantial evidence to supplement data from the randomized controlled trials comparing DOACs with VKA for prevention of stroke and systemic embolization but also serve as effective tools to examine patient characteristics, adherence to practice guidelines in the use of OACs, and long-term outcomes in patients with AF [8, 10–12].Most clinical and epidemiological studies and registries of AF have been conducted in Western countries where clinical features, guideline adherence, and prognosis in patients with AF differ significantly compared with those in the Middle East [2, 13–15]. Studies from the Middle East have shown that the AF population is younger and has higher prevalence of cardiovascular risk factors and comorbid diseases including sedentary lifestyles, obesity, diabetes mellitus, hypertension, and coronary heart disease [16, 17]. Studies have also demonstrated a pattern of low rate of utilization of OACs in general and DOACs in particular compared with patients in the West [13, 17–19]. Major limitations of these studies restrict their applicability in wider Middle Eastern countries and populations. Two large regional AF studies [20, 21] enrolled an inhomogeneous cohort that included native as well as Southeast Asian patients. The Southeast Asian patients included in the Gulf registry were mostly foreign workers with different clinical profiles compared with the native population.Furthermore, these studies did not evaluate the prevalence and demographic and clinical disparities between VAF and NVAF, and many of these studies were conducted before the widespread use of DOACs. Other limitations include the small sample size, retrospective design, single center experience, and lack of data on the adherence to recent clinical practice guidelines in the utilization of OACs according to the CHA2DS2-VASc score [16, 22–26].The Jordan Atrial Fibrillation (JoFib) Study enrolled a consecutive cohort of patients with AF evaluated at a large number of hospitals and ambulatory care clinics in a Middle Eastern country to provide a contemporary insight on the baseline clinical features of patients with VAF and NVAF, presence of comorbid diseases, the CHA2DS2-VASc score, the utilization of OACs according to the 2019 American Heart Association (AHA)/American College of Cardiology (ACC)/Heart Rhythm Society (HRS) focused update of the 2014 AHA/ACC/HRS guideline for the management of patients with atrial fibrillation [6], and the independent factors associated with the use of these medications.


## 2. Materials and Methods

The JoFib Study is a prospective multicenter observational registry that enrolled consecutive patients aged ≥18 years who were diagnosed to have AF in 18 hospitals and 11 outpatient cardiology clinics from May 25, 2019, through October 25, 2020. Data were collected using a standardized clinical data form at the time of enrollment, and at one, 6, and 12 months after the initial assessment. Diagnosis of AF was confirmed by 12-lead electrocardiogram (EKG), rhythm strip lasting ≥30 seconds, ≥1 episodes of AF on ambulatory EKG monitor, or a past diagnosis by a treating cardiologist. Baseline data included clinical and demographic profiles, laboratory data, EKG, transthoracic echocardiographic features, and the use of OACs and other pharmacological medications. Standard definitions were used to classify the types of AF, including paroxysmal, persistent, long standing, and permanent [6], and to calculate the CHA2DS2-VASc [27] and HAS-BLED [28] scores for each patient. Eligibility for oral anticoagulant agents was analyzed based on the 2019 AHA/ACC/HRS focused update of the 2014 AHA/ACC/HRS guideline for the management of patients with atrial fibrillation [6]. This update recommends VKA for patients with VAF (i.e., those who have moderate to severe mitral stenosis or a mechanical heart valve) (Class I indication) and DOACs over warfarin in eligible patients with AF including women with a CHA2DS2-VASc score of ≥3 or men with a score of ≥2 (Class I recommendation). The update recommends considering the use of OACs in women with a CHA2DS2-VASc score of 2 and men with a score of 1 (Class IIb recommendation) and omitting OACs in women with a CHA2DS2-VASc score of 1 or men with a score of 0 (Class IIa recommendation). Patients with a contraindication to OACs at the time of study enrollment (active bleeding or high risk of bleeding) were considered ineligible for OAC use regardless of the CHA2DS2-VASc score.The study was approved by the Institutional Review Board of participating centers, and patients signed written informed consent. All treatment decisions were left to the discretion of the treating physician. The study was registered with Clinicaltrials.gov (unique identifier number).


## 3. Statistical Analysis

Descriptive statistics were performed using means and standard deviation (SD) to describe the continuous variables, and percentages were used to describe the categorical variables. An independentt-test was used to compare means, and a chi-squared test was used to compare percentages. Multivariate binary logistic regression was conducted to determine factors associated with OAC use. The variables in the logistic regression model were selected using a stepwise backward method. p value of ≤0.05 was considered statistically significant.


## 4. Results and Discussion

### 4.1. Results

Of the 2000 consecutively enrolled patients, 177 (8.9%) patients had VAF and 1823 (91.1%) patients had NVAF. Patients in the VAF group had either moderate to severe mitral stenosis (66 patients, 37.3%) or mechanical prosthetic valve (111 patients, 62.7%). The baseline clinical characteristics of both groups are shown in Table1. Compared with patients in the VAF group, patients in the NVAF group were older and had higher prevalence of the classical cardiovascular risk factors, except overweight which was more prevalent in patients with VAF. Prevalence of nine prespecified comorbid diseases was similar in the two groups, except ischemic heart disease which was more prevalent in the NVAF group compared to the VAF group. The echocardiographic data demonstrated a larger left atrial size and higher prevalence of pulmonary artery hypertension, but similar left ventricular ejection fraction in the VAF group compared to the NVAF group.Table 1
Baseline clinical characteristics of 2000 patients with valvular and nonvalvular atrial fibrillation.
Clinical featuresValvular AF (N=177, 8.9%)Nonvalvular AF (N=1823, 91.1%)p valueAge in years (mean±SD)62.1±12.069.6±11.4<0.001Age<50 years27 (15.3%)165 (9.1%)<0.001Age>75 years18 (10.2%)533 (29.2%)<0.001Females118 (66.7%)949 (52.1%)<0.001Hypertension95 (53.7%)1391 (76.3%)<0.001Diabetes mellitus55 (31.1%)827 (45.4%)<0.001Bodymassindex>25kg/m2∗104 (65.8%)1288 (77.3%)0.002Hypercholesterolemia49 (27.7%)829 (45.5%)<0.001Current cigarette smoking26 (14.7%)247 (13.6%)0.65Permanent atrial fibrillation83 (46.9%)521 (28.6%)<0.001Stroke or systemic embolization27 (15.3%)298 (16.3%)0.83Ischemic heart disease13 (7.3%)212 (11.6%)<0.001Heart failure33 (18.6%)434 (23.8%)0.14Leftventricularejectionfraction<40%∗16 (9.2%)229 (13.4%)0.15Pulmonary hypertension∗79 (44.6%)264 (25.5%)<0.001Left ventricular hypertrophy∗∗54 (33.8%)653 (39.6%)0.09Sleep apnea3 (17%)73 (4.0%)0.15Chronic lung disease6 (3.4%)79 (4.3%)0.64Chronic kidney disease11 (6.2%)170 (9.3%)0.22HAS-BLED score (mean±SD)1.5±1.21.7±1.10.004∗Body mass index was measured in 1824 patients, left ventricular ejection fraction in 1888 patients, pulmonary hypertension in 1998 patients, and left ventricular hypertrophy in 1808 patients.VKA was prescribed for the majority (156, 88.1%) of patients with VAF. DOACs were prescribed for 14 (7.9%) patients, and 7 (4.0%) patients were not prescribed with OACs.The CHA2DS2-VASc score was used to determine the use of OACs in patients with NVAF (Figure 1). The mean CHA2DS2-VASc score in women was 4.2±1.3 and in men 3.1±1.7. There were 1468 (80.5%) patients with high scores (women with a CHA2DS2-VASc score of ≥3 and men with a score of ≥2). Of those, 1204 (82.0%) received OACs; DOACs were given to 784 (53.4%) and VKA to 420 (28.6%) patients.Figure 1
Use of anticoagulant agents in patients with nonvalvular AF according to the CHA2DS2-VASc score. DOACs: direct oral anticoagulant agents; LMWH: low molecular weight heparin; VKA: vitamin K antagonist.Of 202 (11.1%) patients with an intermediate score, OACs were prescribed for 148 (73.3%) patients including 107 (53.0%) patients who received DOACs and 41 (20.3%) patients who received VKA. Finally, there were 153 (8.4%) patients with a low score, in whom OACs were omitted in 94 (61.4%) patients and prescribed for 59 (38.6%) patients. Among patients with NVAF, 368 (20.2%) did not receive OACs and 45 (2.4%) were prescribed with low molecular weight heparin. Contraindication for anticoagulation was documented in 41 of these patients including active bleeding, high risk of bleeding, or enrollment in the study during the perioperative period.Aspirin, a second antiplatelet agent, and dual antiplatelet agents were prescribed for 755 (37.8%), 279 (14.0%), and 127 (6.4%) of all patients, respectively. There were 596 (29.8%) patients who were prescribed a combination of OAC and antiplatelet agent(s). Of 264 patients not receiving OACs despite high CHA2DS2-VASc scores, 190 (72.0%) were prescribed with antiplatelet agents.In the univariate analysis (Table2), OACs were more likely to be prescribed for females, patients aged 50 years or older, patients with hypertension or diabetes mellitus, nonsmokers, patients with nonparoxysmal AF, patients with prior stroke or systemic embolization, patients with leftventricularejectionfraction<40%, patients with heart failure, and patients with a CHA2DS2-VASc score≥2 or 3. In the multivariate analysis (Table 3), patients aged between 50 and 70 years were almost twice (OR=1.8) more likely to be prescribed OACs compared to patients aged <50 years. The odds of OAC prescription were significantly higher among patients treated in outpatient clinics, nonsmokers, patients with dyslipidemia, patients with cancer, patients with stroke or systemic embolization, and patients with nonparoxysmal AF. A CHA2DS2-VASc score of ≥2 was significantlyassociated with increased odds of OAC prescription. A one-unit increase in the HAS-BLED score was significantly associated with a 20% decrease in the odds of OAC prescription.Table 2
Univariate analysis of factors associated with oral anticoagulant agent use among patients with nonvalvular atrial fibrillation.
OACs not usedOACs usedpN%N%Sex0.002Male20223.8%64676.2%Female16617.9%76382.1%Age<0.001<50 years8350.9%8049.1%50-75 years19317.6%90582.4%>75 years9217.8%42482.2%Hypertension<0.001No14233.6%28166.4%Yes22616.7%112883.3%Diabetes mellitus0.002No22923.3%75276.7%Yes13917.5%65782.5%Current cigarette smoking<0.001No28218.4%125081.6%Yes8635.2%15864.8%Type of atrial fibrillation<0.001Paroxysmal22934.0%44466.0%Nonparoxysmal13912.6%96587.4%Patient enrollment setting<0.001Outpatient22717.9%104482.1%Inpatient14127.9%36572.1%Chronic kidney disease0.440No33020.5%128279.5%Yes3823.0%12777.0%Stroke or systemic embolization0.009No32521.8%116578.2%Yes4315.0%24485.0%Left ventricular ejection fraction0.004<40%2913.4%18786.6%≥40%31921.9%113778.1%Heart failure0.001No26522.8%89577.2%Yes6014.3%36085.7%Ischemic heart diseaseNo26522.8%89577.2%Yes4421.5%16178.5%Body mass index0.288<257921.6%28778.4%≥2524019.1%101880.9%CHA2DS2-VASc score<0.001<212649.4%12950.6%≥224215.9%128084.1%CHA2DS2-VASc<0.001<318036.8%30963.2%≥318814.6%110085.4%Table 3
Multivariate analysis of factors associated with OAC use among patients with nonvalvular atrial fibrillation.
VariableCI95% confidence intervalp valueAge (year)<501.050-751.81.12.80.01>751.40.82.30.24Setting of patient enrollment (outpatient vs. inpatient)1.91.52.6<0.001Current smoking (no vs. yes)1.71.22.40.004Cancer (no vs. yes)1.81.03.00.04Stroke or systemic embolization (yes vs. no)1.71.12.50.01Atrial fibrillation type (nonparoxysmal vs. paroxysmal)3.22.54.2<0.001HAS-BLED score (per score increase)0.80.70.9<0.001CHA2DS2-VASc score (≥2 vs. <2)3.72.55.4<0.001


## 4.1. Results

Of the 2000 consecutively enrolled patients, 177 (8.9%) patients had VAF and 1823 (91.1%) patients had NVAF. Patients in the VAF group had either moderate to severe mitral stenosis (66 patients, 37.3%) or mechanical prosthetic valve (111 patients, 62.7%). The baseline clinical characteristics of both groups are shown in Table1. Compared with patients in the VAF group, patients in the NVAF group were older and had higher prevalence of the classical cardiovascular risk factors, except overweight which was more prevalent in patients with VAF. Prevalence of nine prespecified comorbid diseases was similar in the two groups, except ischemic heart disease which was more prevalent in the NVAF group compared to the VAF group. The echocardiographic data demonstrated a larger left atrial size and higher prevalence of pulmonary artery hypertension, but similar left ventricular ejection fraction in the VAF group compared to the NVAF group.Table 1
Baseline clinical characteristics of 2000 patients with valvular and nonvalvular atrial fibrillation.
Clinical featuresValvular AF (N=177, 8.9%)Nonvalvular AF (N=1823, 91.1%)p valueAge in years (mean±SD)62.1±12.069.6±11.4<0.001Age<50 years27 (15.3%)165 (9.1%)<0.001Age>75 years18 (10.2%)533 (29.2%)<0.001Females118 (66.7%)949 (52.1%)<0.001Hypertension95 (53.7%)1391 (76.3%)<0.001Diabetes mellitus55 (31.1%)827 (45.4%)<0.001Bodymassindex>25kg/m2∗104 (65.8%)1288 (77.3%)0.002Hypercholesterolemia49 (27.7%)829 (45.5%)<0.001Current cigarette smoking26 (14.7%)247 (13.6%)0.65Permanent atrial fibrillation83 (46.9%)521 (28.6%)<0.001Stroke or systemic embolization27 (15.3%)298 (16.3%)0.83Ischemic heart disease13 (7.3%)212 (11.6%)<0.001Heart failure33 (18.6%)434 (23.8%)0.14Leftventricularejectionfraction<40%∗16 (9.2%)229 (13.4%)0.15Pulmonary hypertension∗79 (44.6%)264 (25.5%)<0.001Left ventricular hypertrophy∗∗54 (33.8%)653 (39.6%)0.09Sleep apnea3 (17%)73 (4.0%)0.15Chronic lung disease6 (3.4%)79 (4.3%)0.64Chronic kidney disease11 (6.2%)170 (9.3%)0.22HAS-BLED score (mean±SD)1.5±1.21.7±1.10.004∗Body mass index was measured in 1824 patients, left ventricular ejection fraction in 1888 patients, pulmonary hypertension in 1998 patients, and left ventricular hypertrophy in 1808 patients.VKA was prescribed for the majority (156, 88.1%) of patients with VAF. DOACs were prescribed for 14 (7.9%) patients, and 7 (4.0%) patients were not prescribed with OACs.The CHA2DS2-VASc score was used to determine the use of OACs in patients with NVAF (Figure 1). The mean CHA2DS2-VASc score in women was 4.2±1.3 and in men 3.1±1.7. There were 1468 (80.5%) patients with high scores (women with a CHA2DS2-VASc score of ≥3 and men with a score of ≥2). Of those, 1204 (82.0%) received OACs; DOACs were given to 784 (53.4%) and VKA to 420 (28.6%) patients.Figure 1
Use of anticoagulant agents in patients with nonvalvular AF according to the CHA2DS2-VASc score. DOACs: direct oral anticoagulant agents; LMWH: low molecular weight heparin; VKA: vitamin K antagonist.Of 202 (11.1%) patients with an intermediate score, OACs were prescribed for 148 (73.3%) patients including 107 (53.0%) patients who received DOACs and 41 (20.3%) patients who received VKA. Finally, there were 153 (8.4%) patients with a low score, in whom OACs were omitted in 94 (61.4%) patients and prescribed for 59 (38.6%) patients. Among patients with NVAF, 368 (20.2%) did not receive OACs and 45 (2.4%) were prescribed with low molecular weight heparin. Contraindication for anticoagulation was documented in 41 of these patients including active bleeding, high risk of bleeding, or enrollment in the study during the perioperative period.Aspirin, a second antiplatelet agent, and dual antiplatelet agents were prescribed for 755 (37.8%), 279 (14.0%), and 127 (6.4%) of all patients, respectively. There were 596 (29.8%) patients who were prescribed a combination of OAC and antiplatelet agent(s). Of 264 patients not receiving OACs despite high CHA2DS2-VASc scores, 190 (72.0%) were prescribed with antiplatelet agents.In the univariate analysis (Table2), OACs were more likely to be prescribed for females, patients aged 50 years or older, patients with hypertension or diabetes mellitus, nonsmokers, patients with nonparoxysmal AF, patients with prior stroke or systemic embolization, patients with leftventricularejectionfraction<40%, patients with heart failure, and patients with a CHA2DS2-VASc score≥2 or 3. In the multivariate analysis (Table 3), patients aged between 50 and 70 years were almost twice (OR=1.8) more likely to be prescribed OACs compared to patients aged <50 years. The odds of OAC prescription were significantly higher among patients treated in outpatient clinics, nonsmokers, patients with dyslipidemia, patients with cancer, patients with stroke or systemic embolization, and patients with nonparoxysmal AF. A CHA2DS2-VASc score of ≥2 was significantlyassociated with increased odds of OAC prescription. A one-unit increase in the HAS-BLED score was significantly associated with a 20% decrease in the odds of OAC prescription.Table 2
Univariate analysis of factors associated with oral anticoagulant agent use among patients with nonvalvular atrial fibrillation.
OACs not usedOACs usedpN%N%Sex0.002Male20223.8%64676.2%Female16617.9%76382.1%Age<0.001<50 years8350.9%8049.1%50-75 years19317.6%90582.4%>75 years9217.8%42482.2%Hypertension<0.001No14233.6%28166.4%Yes22616.7%112883.3%Diabetes mellitus0.002No22923.3%75276.7%Yes13917.5%65782.5%Current cigarette smoking<0.001No28218.4%125081.6%Yes8635.2%15864.8%Type of atrial fibrillation<0.001Paroxysmal22934.0%44466.0%Nonparoxysmal13912.6%96587.4%Patient enrollment setting<0.001Outpatient22717.9%104482.1%Inpatient14127.9%36572.1%Chronic kidney disease0.440No33020.5%128279.5%Yes3823.0%12777.0%Stroke or systemic embolization0.009No32521.8%116578.2%Yes4315.0%24485.0%Left ventricular ejection fraction0.004<40%2913.4%18786.6%≥40%31921.9%113778.1%Heart failure0.001No26522.8%89577.2%Yes6014.3%36085.7%Ischemic heart diseaseNo26522.8%89577.2%Yes4421.5%16178.5%Body mass index0.288<257921.6%28778.4%≥2524019.1%101880.9%CHA2DS2-VASc score<0.001<212649.4%12950.6%≥224215.9%128084.1%CHA2DS2-VASc<0.001<318036.8%30963.2%≥318814.6%110085.4%Table 3
Multivariate analysis of factors associated with OAC use among patients with nonvalvular atrial fibrillation.
VariableCI95% confidence intervalp valueAge (year)<501.050-751.81.12.80.01>751.40.82.30.24Setting of patient enrollment (outpatient vs. inpatient)1.91.52.6<0.001Current smoking (no vs. yes)1.71.22.40.004Cancer (no vs. yes)1.81.03.00.04Stroke or systemic embolization (yes vs. no)1.71.12.50.01Atrial fibrillation type (nonparoxysmal vs. paroxysmal)3.22.54.2<0.001HAS-BLED score (per score increase)0.80.70.9<0.001CHA2DS2-VASc score (≥2 vs. <2)3.72.55.4<0.001


## 5. Discussion

This study represents the first registry of a large cohort of Middle Eastern patients that focuses on contemporary management of AF according to the 2019 AHA/ACC/HRS focused update of the 2014 AHA/ACC/HRC guideline on the use of OACs for the prevention of the most serious and life-threatening complications, stroke, and systemic embolization [6]. The study showed that about 9 out of 10 of the enrolled patients have NVAF and also showed a high degree of adherence to current practice guidelines on OAC utilization, with more than 8 out of 10 of patients with NVAF who have a high CHA2DS2-VASc score received OACs with DOACs accounting for 65%.Contrary to the belief of valvular heart disease, and rheumatic mitral stenosis in particular, being the main cause of AF in developing countries, this study concurs with other Middle Eastern studies showing that <10% of all patients with AF have VAF [21, 23, 29]. This could be a reflection of decreasing incidence and prevalence of rheumatic heart disease in our region and the increasing prevalence of cardiovascular risk factors and comorbidities that predispose to NVAF including the demographic transition to an inverted age pyramid with an increase in numbers of older population, hypertension, diabetes mellitus, coronary heart disease, obesity, and sedentary lifestyles [30–32]. The rising burden of NVAF, among other cardiovascular diseases in developing countries, reflects a rising prevalence of noncommunicable diseases and leads to an increase in total mortality, morbidity, and health budgets in the region [33, 34].Despite these worrying trends, we lack studies that address the clinical profiles, utilizing OACs according to contemporary guidelines and factors affecting the prescription patterns in a large cohort of patients in this region. Smaller studies from the Middle East and other regions have demonstrated a significant geographical heterogeneity in rates of adherence to the published guidelines in prescribing DOACs vs. VKAs for patients with AF [35–37]. Utilization of OAC in our study was closer to those reported from Western countries where the rate of use of OACs ranged between 34% and 85% of patients [5, 8, 38, 39] with DOACs accounting for 41% of OACs [8]. The use of OACs in about one-third of patients with low CHA2DS2-VASc scores, despite a Class IIa recommendation to omit these agents, might be explained by an exaggerated perception by the treating physician of the risk of stroke or systemic embolization in such patients.It is noteworthy that non-OAC antithrombotic medications were prescribed in this study for a small (15%) group of NVAF patients with high CHA2DS2-VASc scores; seven of 10 of those patients were prescribed one or two antiplatelet agent(s). Several studies [40, 41] have shown that antiplatelet agents are being prescribed to a considerable portion of OAC-eligible patients despite the lack of a protective role in patients with NVAF with high CHA2DS2-VASc [6]. The most recent clinical practice guideline on the management of AF by the European Society of Cardiology was published in mid-2020 [42], at a time when this study was in its final enrollment phases. This guideline is essentially not different from the 2019 update guideline we used for evaluating the adherence to OAC use.The independent factors that were shown by this study to be associated with higher rates of OAC utilization are not different from those reported by other investigators [6, 8–10, 43, 44]. Patients who had or at higher risk of stroke or systemic embolization due to a high CHA2DS2-VASc score were more likely to be prescribed with DOACs than those who did not have these features. Patients aged between 50 and 75 years being more likely to receive OACs than those older than 75 years is probably related to perceived lower risk of bleeding in this age group compared with older patients. Another finding of the study is that a high bleeding risk, indicated by a higher HAS-BLED score, negatively impacted OAC utilization. This may account in part for gaps in adherence to AF management guidelines which explicitly state that a high level of HAS-BLED score is not a justification to withhold OAC [6, 42].In line with other studies [44–46], we found that patients with nonparoxysmal AF were more likely to receive OACs than those with paroxysmal AF. It is well established that a significant proportion of episodes of stroke in patients with AF occur in those with a history of paroxysmal AF, and the guidelines recommend OAC for stroke prevention for all types of AF with appropriate scores.Other factors reported by other investigators to be associated with higher odds of utilizing OACs include duration ofAF>5 years, higher education levels, treatment by a cardiologist, and using a pill sorting box and calendar. Frailty and self-paying, on the other hand, were associated with lower odds of prescribing OACs [43–45].The present study has few potential limitations. Similar to all registries of observational nature, data collected might be subject to potential bias despite reinforcing consecutive recruitment from the outset of the study. The fact that this study was based on cardiologist-managed patients, selection bias may limit the generalizability of these findings to patients treated by other specialties. Involving 29 outpatient clinics and hospitals from public university and private sectors in the study will enhance the generalizability of the results. Despite these limitations, the data shown represent a contemporary addition to studies that evaluate clinical features and utilization of OACs in a Middle Eastern population with VAF and NVAF. Furthermore, the study sets a higher standard for adherence to recent clinical practice guidelines on the utilization of OACs. Participating centers will be provided with feedback to create a quality improvement initiative geared toward increasing the utilization of evidence-based pharmacotherapy for patients with AF and will help further dissemination of such measures to other specialties dealing with AF.


## 6. Conclusions

The study demonstrated an assuring level of adherence to the 2019 AHA/ACC/HRS focused update of the 2014 AHA/ACC/HRS guideline on the use of oral anticoagulant agents in Middle Eastern patients with VAF and NVAF. Impact of these findings on the incidence of acute stroke, systemic embolization, and bleeding events awaits the one-year follow-up data.



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