QRS Duration on Electrocardiography and Cardiovascular Mortality (from the National Health and Nutrition Examination Survey—III)

Quantitative Electrocardiographic Analysis in Relation to Renal Function in a Geriatric Population

“…The ECG alterations associated with worsening renal function as observed in this study, namely increased heart rate [29], QRS duration [30], and QRS-T angle [24,31], have all been correlated with a poor cardiovascular prognosis and the development of heart failure in different patient populations. Therefore, these ECG alterations may represent early markers of heart disease and an increased cardiovascular risk.…”

The PR interval and QRS duration could be predictors of renal function decline

“…Moreover, Chan et al [20] identified that prolongation of iPR is a risk marker for the continuum of endothelial dysfunction and vascular damage and repair both in healthy subjects and in those with established CVD. On the other hand, previous studies showed that prolongation of dQRS could be an independent predictor of CVD mortality [7,21] Badheka et al [21] suggested that dQRS could be associated with degeneration, calcification and fibrosis of the conduction system with advanced age as a result of atherosclerosis.…”

Relationship between electrocardiographic characteristics of left bundle branch block and echocardiographic findings

“…Several manuscripts indicate that the presence of extreme left axis deviation, right axis deviation (paradoxical type) and very prolonged QRS complex in patients with CLBBB are markers of poor prognosis [10,11,17,[25][26][27]. These findings led us to hypothesize that both ECG parameters could be useful to detect left ventricular systolic dysfunction.…”

“…CLBBB may precede the onset of heart disease for years, leading some investigators to consider it a possible precursor to latent cardiomyopathy [2]. Although some studies have suggested that CLBBB may have a benign prognosis [7,8], most have indicated that CLBBB has poorer prognosis in comparison to normal intraventricular conduction and also compared to right bundle branch block, with a median survival of 5 years from the time of diagnosis [2,4,5,7,[9][10][11][12]. Furthermore, the electrocardiography (ECG) characteristics of CLBBB obscure the application of common criteria for the diagnosis of left ventricular hypertrophy (LVH), myocardial infarction (MI) in the chronic phase, and diseases that cause modifications on the ST-T segment, establishing a need for other studies to assess these heart diseases in the presence of CLBBB [13][14][15][16][17].…”