bluuebunny/crossref_metadata_2025_split huggingface dataset:
Age and sex differences in the effects of short- and long-term exposure to air pollution on endothelial dysfunction
Authors: Zhang H , Li J 
Published: October 2024

Abstract

Background
Endothelial dysfunction is an integrated index of risk factor burden and a marker of atherosclerotic cardiovascular disease. Air pollution is widely acknowledged as a significant non-traditional risk factor for cardiovascular disease. However, the impact of air pollutants at varying concentrations and exposure durations on endothelial function in different populations remains unclear.

Purpose
We aimed to use brachial artery flow-mediated dilatation (FMD) to identify demographic differences in the effects of short- and long-term exposure to air pollution on endothelial dysfunction.

Methods
We measured FMD in 850 participants from October 2016 to January 2020. Location-specific concentrations of fine particulate matter &lt;2.5 μm aerodynamic diameter (PM2.5), inhalable particulate matter &lt;10 μm aerodynamic diameter (PM10), sulfur dioxide (SO2), nitrogen dioxide (NO2), carbon monoxide (CO), and ozone (O3) measured by fixed ambient air monitoring stations were collected for short- and long-term exposure assessment. We used the moving average 7- and 14-day exposures before the date of FMD measurements to estimate the short-term exposure effects and the moving average 12-month exposures before the date of FMD measurements to estimate the long-term exposure effects. Multiple linear regression models and restricted cubic splines were used to assess the associations before and after stratified by age and sex.

Results
This study eventually included 828 participants [551 (66.5%) younger than 65 years and 553 (66.8%) men]. Each 10 μg/m³ increase in 12-month exposure to PM10 and NO2 was significantly and linearly associated with -0.20% (95% CI: -0.37 to -0.03) and -0.58% (95% CI: -0.99 to -0.18) changes in FMD in all participants. 12-month exposure to gaseous pollutants was also significantly but nonlinearly associated with lower FMD. 7-day exposure to Quartile 4 of SO2 was significantly associated with a 0.70% decrease in FMD compared to Quartile 1 (β = -0.70, 95% CI: -1.40 to -0.008). No relationships were observed between 7- and 14-day exposure to PM2.5, PM10, NO2, CO, and endothelial dysfunction. Although interaction effects were limited to SO2 and sex, significant associations with different air pollutants were only found in men and those younger than 65 years after stratified.

Conclusions
Long-term exposure to air pollution is strongly associated with decreased endothelial function, and susceptibility to air pollution varies significantly with age and sex. Further identification of different susceptible populations and proactive measures to mitigate air pollution may be beneficial in reducing the burden of cardiovascular disease.
Evidence that mitral and/or tricuspid regurgitation diminishes stroke volume increase during exercise
Authors: Kubota M , Adachi H , Hoshino K , Naito S 
Published: October 2024

Abstract

Background and Purpose
The severity of heart failure can be evaluated by peak oxygen consumption (VO2). Cardiac output is one of the major essential factors to determine the VO2. Therefore, cardiac output increases linearly as the exercise intensity increases. However, in mitral regurgitation, effective stroke volume decreases due to some blood flowing back into the left atrium from the left ventricle. This reduction may compromise oxygen delivery to working muscles and diminish oxygen uptake.
Peak VO2/HR is known to indicate the stroke volume at the peak exercise, but since c(A-V)O2 difference shows almost a similar change pattern during a ramp protocol, VO2/HR during the load is also reported to be an indicator of stroke volume (SV) at that work rate. However, there are no investigations that have examined the extent to which the increase in cardiac output during stress is affected by the severity of mitral regurgitation. Therefore, we investigated the influence of the degree of regurgitant volume in mitral regurgitation (MR) and tricuspid regurgitation (TR) affects the SV increasing response to exercise load. Additionally, we examined whether blunted SV increase influences on the peak VO2.

Methods
Among 525 patients who underwent cardiopulmonary exercise test (CPX) at our institution from January 2023 to October 2023, 518 patients (143 females, 375 males, mean age 65.2±15.0 years old) where precise analyses of CPX was possible. CPX was performed using breath-by-breath gas analysis, and an incremental load test (10watts/min) was administered until exhaustion. The rate of increase in VO2/HR per watt during an incremental loading (Δ(VO2/HR)/ΔWR) was used as an indicator of the degree of increase in SV. Typically, SV increases up to 60% of maximum load, around AT, after which it stops increasing and plateaus. Therefore, the slope of Δ(VO2/HR)/ΔWR was examined from the initiation of ramp loading to AT. The degree of reflux was evaluated by echocardiography and classified as none/trivial, mild and moderate/severe. The number of people in each group of None/trivial, mild, moderate/severe was, 392, 83, 30 for MR, and 416, 64, 24 for TR. Δ(VO2/HR)/ΔWR was evaluated for each degree of reflux, using ANOVA to determine whether there was a difference between groups.

Results
As shown in the Figure1, Δ(VO2/HR)/ΔWR decreased as the reflux flow rate increased for both MR and TR. Concurrently, peak VO2 also decreased in the moderate/severe group compared to the non/trivial-reflux group for both MR and TR (MR: 17.5±5.4 mL/min/kg vs. 14.9±3.5 mL/min/kg, TR: 17.2±5.3 mL/min/kg vs. 13.6±3.8 mL/min/kg).

Conclusion
The Δ(VO2/HR)/ΔWR obtained through CPX has been shown to be an index that can evaluate the severity of reflux. Additionally, it was also demonstrated that as regurgitation flow increased, true stroke volume decreases, which is correlated with a reduction in peak VO2.
The utility of cardiac rehabilitation in improving endothelium-dependent vascular function in very elderly patients
Authors: Matsuzawa Y , Someya R , Nakahashi H , Konishi M , Akiyama E , Tsujita K , Hibi K 
Published: October 2024

Abstract

Background
Endothelial function is crucial for cardiovascular health and diseases. Cardiac rehabilitation has been reported to be useful in enhancing physical performance, quality of life, and endothelial function. The aging of patients with cardiovascular diseases is further progressing, and it is unclear whether cardiac rehabilitation improves physical function and endothelial function in very elderly patients with cardiovascular diseases.

Purpose
The purpose of this study is to investigate whether outpatient cardiac rehabilitation for individuals aged 80 and above improves physical function, quality of life (QOL), and vascular endothelial function.

Methods
Forty nine patients aged over 80 years with cardiovascular diseases participated in an outpatient cardiac rehabilitation program. Cardiac rehabilitation was conducted for 1 hour per session, 1-2 times per week for 3-4 months. Cardiopulmonary exercise testing (CPX) was conducted for the evaluation of physical function. QOL was assessed with Kansas City Cardiomyopathy Questionnaire (KCCQ) scores. The reactive hyperemia index (RHI) was measured using EndoPAT2000 in each patient to assess endothelial function. An RHI ≤ 1.67 was defined as endothelial dysfunction.

Results
The mean ± standard deviation of age was 84 ± 4 years, with 16 (33%) being male. Peak oxygen uptake improved significantly (from 14.1 ± 4.0 to 15.4 ± 3.9 mL/kg/min, P=0.002), as did short physical performance battery scores (from 10.1 ± 2.7 to 10.7 ± 2.0, P=0.004), mini-mental state examination scores (from 27.7 ± 2.2 to 28.2 ± 2.0, P=0.004), Japanese version of the Cardiovascular Health Study criteria (from 2.3 ± 1.3 to 1.5 ± 1.2, P&lt;0.0001), and KCCQ scores (from 76.8 ± 18.4 to 81.4 ± 20.4, P=0.02) after the cardiac rehabilitation program. Endothelial function also improved (LogRHI 0.48 ± 0.39 to 0.57 ± 0.30, P=0.027), and the prevalence of endothelial dysfunction decreased from 54% to 36% after the cardiac rehabilitation program.

Conclusion
Even in the very elderly patients, outpatient cardiac rehabilitation is beneficial for improving physical function, quality of life, and endothelial function.
A regional multicentre prospective survey addressing sport-related myocardial infarction: clinical characteristics of 155 patients and one year follow-up
Authors: Kouame I M , Chague F , Maza M , Bichat F , Braghini N , Saint-Jalmes M , Vincent Martin M , Lhuillier I , Porot G , Molins G , Mock L , Ravisy J , Cottin Y , Zeller M 
Published: October 2024

Abstract

Background
Exercise is a keystone of cardiovascular prevention; however, it is also a powerful trigger of acute cardiovascular events including sudden cardiac arrest and acute myocardial infarction. Contemporary studies addressing these sport-related myocardial infarction (SR-MI) are scarce.

Aim
To describe clinical characteristics and follow-up of SR-MI.

Methods
We conducted a regional multicentric prospective survey addressing patients admitted for a SR-MI in 2 intensive coronary units. SR-MI was defined as MI onset occurring during sport or within the 1st hour of recovery. A one-year follow-up was performed by phone call.

Results
From April 1st 2018 to February 23th 2023, 155 SRMI were included, of whom 13 (8.4%) were female, median age was 61-y. (IQR 54-66). Cycling was the most frequent sport (32.5%) followed by fitness and hiking (12.6% each) then jogging (11.3%) (Figure). Most were ST elevation MI (68.8%). The main risk factors were dyslipidaemia (33.8%), hypertension (27.3%) and tobacco smoking (24.5%). No cardiovascular risk factor other than age was identified in 38 patients (25.7%). Prodromal symptoms were reported by 66 subjects (42.6%). SR-MI occurred mostly during exercise (60.6%). Out of hospital cardiac arrest (OHCA) occurred in 20 (12.6%) patients, more commonly among patients with prior coronary artery disease (CAD) (p = 0.02) and tobacco smoking (p=0.047). A significant single vessel disease was observed in 67 patients (43.2%); revascularization was performed by stenting in 134 patients (86.5%) and surgery in 11 (7.1%). In-hospital death occurred in 4 patients and was associated to OHCA (p=0.007). Among the survivors at time of discharge (151 patients), 141 were eligible to follow-up, none one lost: one patient died suddenly at home, one suffered from a recurrent MI, one experienced a cardioversion from his implantable cardioverter defibrillator (ICD) and an ICD was implanted in 4 others. A cardiovascular rehabilitation was performed in 101 patients (65.2%); from the 30 smokers at the time of SRMI, 26 declared smoking cessation.

Conclusions
Among patients admitted for a SR-MI, most were male. Prodromal symptoms were common but neglected. OHCA occurred in 1 patient out of 8 and was associated with history of CAD, tobacco smoking and in-hospital death. Such findings highlight the need for mass education to prevention including recognition of prodromal symptoms and management of cardiac arrest. In this exercising population, rehabilitation rate was high and quitting tobacco was commonly achieved.Table
Structural echocardiographic parameters in male and female Asian athletes: a systematic review and meta-analysis
Authors: Hon J J , Paik B , Welsh J , Ling R R , Ng J J , Choong A M T L , Yeo T J 
Published: October 2024

Abstract

Introduction
Following repetitive structured and intense physical training, elite athletes’ hearts undergo physiological cardiac remodelling, including increased left ventricular (LV) size and LV wall thickness. These changes may mimic those seen in pathological cardiac conditions such as dilated and hypertrophic cardiomyopathy, posing a challenge for accurate diagnosis. Reference ranges for common echocardiographic parameters in elite Caucasian and Black athletes have been reported, facilitating differentiation between physiological and pathological changes in these demographics. However, there remains a paucity of data for Asian athletes despite their increasing representation in global sport.

Methods
We searched MEDLINE via PubMed, Embase, and the Cochrane Database for relevant studies from inception till 20th November 2023. We included observational studies that reported relevant echocardiographic parameters in elite Asian athletes. Studies that did not report gender-specific cardiac imaging parameters were excluded. After study selection and data extraction, random-effects meta-analysis of means was performed to obtain the weighted mean and 95% confidence intervals (CI) of common echocardiographic parameters stratified by gender.

Results
Our final search yielded 10 studies comprising a total of 1,111 elite athletes (996 male, 115 female; 53% Japanese, 21% uncategorised, 14% South-East Asian). Athletes participating in skill and power disciplines were excluded from analysis post-hoc due to a paucity of data and extreme data ranges.
In male athletes, mean LV wall thickness was 9.4 mm (95% CI 8.5-10.3, I2 = 98.9%), mean LV end diastolic diameter was 54.7 mm (95% CI 52.5-57.0, I2 = 98.6%), mean LV mass indexed to body surface area was 97.5 g/m2 (95% CI 90.5-104.5, I2 = 97.5%) and mean aortic root diameter was 31.9 mm (95% CI 29.2-34.7, I2 = 99.5%).
In female athletes, mean LV wall thickness was 7.9 mm (95% CI 7.5-8.4, I2 = 85.4%), mean LV end diastolic diameter was 47.1 mm (95% CI 45.8-48.3, I2 = 77.3%), mean LV mass indexed to body surface area was 79.5 g/m2 (95% CI 69.2-89.7, I2 = 92.8%) and mean aortic root diameter was 27.5 mm (95% CI 26.9-28.1).

Conclusion
This meta-analysis describes commonly reported echocardiographic parameters in elite Asian athletes from endurance and mixed sport disciplines. The absolute values of all reported parameters appear to fall far below reported limits for non-Asian athletes, highlighting substantial ethnic and regional variation in cardiac remodelling in elite athletes. While our results facilitate preliminary referencing of expected normal ranges in this demographic group, further studies are necessary to fully define the cardiac characteristics of Asian athletes.
Cardiac troponin fragmentation in marathon runners. The MaraCat2 study
Authors: Paana T , Hellman T , Vasankari T , Salonen S , Tuominen T , Teppo K , Jaakkola S , Heinonen O J , Wittfooth S , Airaksinen K E J 
Published: October 2024

Abstract

Background
Cardiac troponins(cTn) are in a key role in the diagnosis of acute myocardial infarction (MI). Minor cardiac troponin elevations are also common after strenuous exercise, while limited evidence suggests this elevation consists mostly of smaller cTn fragments.

Purpose
We aimed to determine if our novel cardiac troponin assay, measuring long molecular forms of cardiac troponin (long cTnT) can differentiate cardiac troponin elevation associated with strenuous exercise from that seen in MI.

Methods
In a Proof-of-Principle study, we developed a simple time-resolved immunofluorometric assay based on europium chelate labels for the measurement of long cardiac troponin T molecules, which showed high accuracy in discriminating between cTn elevations in MI and end-stage renal failure. In the present study, we compared the characteristics of cTn release after a marathon race and Type 1 MI using an improved version of the long troponin test and a commercially available cTnT test.
Troponin composition was analyzed in heparin plasma samples taken from 45 runners &lt;1h after marathon race and from 45 patients with Type 1 MI. The concentration of long cTnT was measured with a novel immunofluorometric assay, total cTnT was measured with a commercial high-sensitivity cTnT assay, and the ratio of long to total cTnT (troponin ratio) was determined.

Results
Conventional cTnT exceeded the upper reference limit in 37 (82%) runners with a median concentration of 25.0 (IQR 16-36)ng/l. Median long cTnT concentration was 4.1 (IQR 2.4-5.8)ng/l. The median total and long cTnT concentration and the troponin ratio were higher in patients with MI than in marathon runners (p&lt;0.001). Troponin ratio decreased (r=-0.497, p&lt;0.001) in marathon runners and increased (r=0.466, p=0.001) in patients with MI with increasing troponin release (Figure 1). In the receiver operating characteristics curve analyses of all patients with cTnT release &gt;14ng/l, long cTnT showed good predictive power with area under curve 0.969 (CI95% 0.939-1.000) in discriminating marathon runners from MI patients.

Conclusions
Our novel highly sensitive long cTnT immunoassay shows that the troponin release after strenuous exercise is composed mainly of smaller troponin fragments. Our test could be useful in separating benign cTnT elevations caused by exercise from those of acute MI.
Exploring the diagnostic yield of family screening and genetic testing in adolescent individuals with pre-clinical phenotypes
Authors: Abela M , Scerri J , Debattista J , Felice T , Grech V , Scerri C 
Published: October 2024

Abstract

Introduction
Family screening and genetic testing are key components in the management strategy of individuals diagnosed with an inherited cardiac condition (ICC). Disease penetrance for most ICCs, notably cardiomyopathies is age dependent, which is why a more permissive approach towards family screening is adopted in young individuals with a pre-clinical phenotype.

Study Objectives
The main objective of this study was to explore the role of family screening and genetic testing in adolescent subjects with a pre-clinical phenotype has not been formally explored.

Methodology
Adolescent probands with a pre-clinical phenotype following a national cardiac screening program (BEAT-IT) were offered genetic testing and family screening. Probands with anterior TWI were rescreened at 16 years. Only those with persistent changes were enrolled in the study. Genetic counselling was also offered to probands and relatives. Testing was initially offered to first degree relatives. Cascade testing (clinical and genetic) was also offered to other generations if a screened relative satisfied one or more of these conditions i) phenotype positive, ii) pre-clinical phenotype, iii) clinically relevant genotype.

Results
16 probands (mean age 15 years) were identified with a pre-clinical phenotype. All had an abnormal ECG (9=inferior/lateral TWI, 6=anterior TWI, 1=ST depression). A comprehensive evaluation was otherwise normal. Half were gene positive (G+), 4 had clinically relevant genotypes (n=4 inferior/lateral TWI). These were classified as likely pathogenic according to ACMG criteria (n=2 MYH7, n=1 ACTC1, n=1 MYBPC3).
71 family members were subsequently screened (59.2% female, median 43Y [IQR 27] at evaluation, 11.3% &lt;18Y at evaluation, 67.6% first degree relatives).
A substantial proportion (n=13, 18.3%) were referred for further evaluation. Two (2/8, 25.0%) were &lt;18Y. An abnormal ECG was the commonest reason for referral (n=9, 12.7%). Three (4.2%) were given a diagnosis (n=2 HCM [both MYH7}, n=1 DCM [ACTC1]). Seven (9.9%) were referred because of an abnormal ECG (n=3 inferolateral TWI, n=2 ventricular ectopics, n=1 anterolateral TWI, n=1 ST depression). Four were G+ and were offered surveillance.
Fourteen (19.7%) were offered family screening because of incorporating genetic testing into the study protocol. Genetics altered the evaluation strategy in 16.9% of screened relatives. More in-depth cascade testing identified 6 (8.5%) individuals who needed follow-up (n=1 diagnosis [DCM], n=1 abnormal ECG, n=4 G+). Gene negative individuals (6, 8.5%) were safely reassured and discharged.

Conclusion
Family screening in adolescent probands with pre-clinical phenotypes offers a reasonable diagnostic yield (4.2% diagnosis, 14.1% surveillance). Incorporating genetic testing into the evaluation protocol offers a more personalized strategy, altering management in a significant proportion of screened relatives (16.9%).
Holter monitoring in neuromuscular disorders: frequency and importance in clinical management
Authors: Fernandes S , Dias M , Conde I , Silva R , Ferreira C , Vilela F , Mane F , Mare R , Marques J , Rocha S 
Published: October 2024

Abstract

Introduction
Cardiac involvement is a common manifestation in a variety of neuromuscular disorders (NMD) and initial cardiac manifestations in these patients are often asymptomatic. Hence, regular 24h-Holter monitoring is recommended to identify conduction disturbances and rhythm disturbances.

Purpose
In this study, we aimed to assess abnormal findings in 24h-Holter monitoring to screen for conduction disturbances and arrhythmias in patients with NMD and evaluate its impact in patients’ treatment.

Methods
A retrospective single-centre study was conducted including all adult patients with NMD who received a 24h-Holter from January 2013 to September 2023.

Results
A total of 76 patients with NMD were included, 39 (51.3%) were male, and mean age was 46,3 ± 11,5 years. Most patients were asymptomatic. A total of 220 Holter recording was analysed. An average of 2,9 ± 1,6 Holter recordings per patient was performed. Abnormal Holter results were found in 47 (61,8%) patients, and mainly consisted of conduction disorders such as atrioventricular block in 31 (65,9%) patients. Other abnormalities included atrial fibrillation/flutter in 6 (12,8%) patients, supraventricular tachycardia in 4 (8,5%) patients, and non-sustained ventricular tachycardia in 6 (12,8) patients. Out of the group of the patients with abnormal Holter findings, ten patients had direct clinical treatment consequences, namely implantation of cardiac electronic devices or initiation of anticoagulation therapy.

Conclusion
In this study, holter findings resulted in relevant clinical treatment consequences in 10 out of 76 patients (13,2%). These results suggest that 24h-Holter monitoring may improve routine cardiac screening in patients with NMD.