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• W1819079984 abstract "Cardiovascular diseases (CVDs) are more common in chronic kidney disease and end-stage renal disease (ESRD) patients as compared with general population and are a major of cause of morbidity and mortality in this population [1,2]. CVD accounts for approximately 50% of mortality in ESRD patients. In addition to the increased chance of coronary artery disease, the chance of developing arrhythmic events and sudden cardiac death is also higher in ESRD patients [3,4]. The underlying pathophysiology behind this increased chance of arrhythmic event in hemodialysis patients is not clearly understood. Previous studies have shown that hemodialysis patients have lower left ventricular ejection fraction and higher atrial diameters as compared with general population [5,6,7]. Using the timing of electrocardiogram and tissue Doppler on echocardiography, the time from electrical activation to muscular contraction can be assessed. Atrial electromechanical delay (AEMD) times have been reported to be longer in ESRD patients and have been shown to improve after each hemodialysis session [6,7,8]. Additionally, prolonged atrial conduction times are considered as predisposing factors for atrial fibrillation [9]. In this issue of Journal, Turkmen et al. [10] from Turkey have compared the cardiac electromechanical characteristics and biochemical profile of 60 hemodialysis patients versus 44 healthy controls. They also followed the hemodialysis patients for 2 years and compared the characteristics of 19 patients who died within this 2-year period versus 41 living hemodialysis patients.Consistent with previous reports, this study showed that hemodialysis patients have significantly longer AEMD times as compared with healthy controls. However, the novel finding of this study was that deceased hemodialysis patients were found to have longer left intra-atrial conduction delay (LIAT) and interatrial EMD times as compared with living hemodialysis patients. Moreover, increased LIAT, interatrial time and C-reactive protein levels (as a marker of inflammation) and decreased albumin levels (as a marker of malnutrition) were found to be associated with increased risk of combined cardiovascular events. The observed increased AEMD times in deceased hemodialysis patients and the positive association of increased LIAT and interatrial time with cardiovascular outcomes could provide a novel explanation for the propensity of arrhythmic events in hemodialysis patients. The prolonged AEMD times in these patients could possibly be due to uremic dysfunction of cardiomyocytes, accelerated apoptosis and autophagy and replacement interstitial matrix/fibrosis that results in slowed electromechanical conduction due to the decreased density of contractile fibers. Inflammation and malnutrition in hemodialysis patients could possibly contribute to this process and potentially be amenable to therapy.This study has several limitations, and therefore, its results should be interpreted cautiously. The most important limitations of this study are its small sample size and short duration of follow-up. The confounding effect of the medical therapy was also not considered in evaluation of association of AEMD times and cardiovascular outcomes. Moreover, due to sparse data, the authors did not evaluate the association of patients' characteristic with each cardiovascular outcome separately. Instead, they used a combined cardiovascular outcome measure comprising of all cardiovascular deaths, myocardial infarctions and atrial fibrillation events.Future studies with larger sample sizes and longer durations of follow-up are needed to evaluate the association of AEMD times with different cardiovascular outcomes such as death due to CVDs, myocardial infarction, sudden cardiac death, atrial fibrillation and other arrhythmic events. Moreover, future studies should attempt to uncover the degree of reversibility of this measure to better understand the dynamic pathobiologic nature of cardiac dysfunction in patients with ESRD.The authors have no conflicts of interest." @default.
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• W1819079984 date "2015-01-01" @default.
• W1819079984 modified "2023-10-17" @default.
• W1819079984 title "Cardiac Electromechanical Abnormalities in Hemodialysis Patients: Indicators of Cardiomyopathy and Future Risk?" @default.
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• W1819079984 doi "https://doi.org/10.1159/000441100" @default.
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