STUDY OBJECTIVES Hypoxemia increases corrected QT dispersion (QTcD), which is the difference between the maximum and minimum QT intervals and is a strong risk factor for cardiovascular mortality. The aim of this study was to investigate the QTcD in patients with obstructive sleep apnea-hypopnea syndrome (OSAHS), and the relationship between the QTcD and (123)I-metaiodobenzylguanidine (MIBG) car...

OBJECTIVE Upper airway obstruction (UAO) can result in cardiac complications, including arrhythmias and sudden cardiac death. Nasal septum deviation (NSD) is a common cause of UAO. The aim of this study was to assess the risk of cardiac arrhythmias in patients with NSD. To assess this risk, we measured noninvasive indicators of atrial arrhythmia (P-wave dispersion [Pd]) and ventricular arrhythm...

BACKGROUND There has not been a longitudinal investigation of the influence of angiotensin-converting enzyme (ACE) insertion/deletion and angiotensinogen (AGT) M235T gene polymorphisms on repolarization parameters, such as QT dispersion (QTd) and the peak and the end of the T-wave interval (Tpe). METHODS AND RESULTS Electrocardiographys were recorded from 106 elderly Chinese at baseline, and ...

BACKGROUND Left ventricular hypertrophy (LVH) is very common in hemodialysis patients and an independent risk factor for mortality in this population. The myocardial remodeling underlying the LVH can affect ventricular repolarization causing abnormalities in QT interval. OBJECTIVE to evaluate the reproducibility and reliability of measurements of corrected QT interval (QTc) and its dispersion...

BACKGROUND We examined whether dobutamine-stress QT dispersion (QTd) and heart-rate corrected QT dispersion (QTcd) are useful for detecting subclinical anthracycline cardiotoxicity. METHODS The subjects were 10 control subjects and 37 patients divided into 4 groups according to cumulative anthracycline dose: non-anthracycline group (group N), 7 patients; low anthracycline cumulative dose grou...

BACKGROUND The aim of the study was to analyse parameters reflecting the sympathovagal control of ventricular depolarisation and repolarisation [heart rate variability (HRV) and QT interval dispersion (QTd)] in patients undergoing elective percutaneous transluminal coronary angioplasty (PTCA), and determine whether HRV correlates with QT dispersion parameters. METHODS The study consisted of 2...

AIM It has previously been shown that β-blocker therapy reduces QT dynamics in heart failure patients. The aim of this study was to demonstrate this improvement with the third-generation β-blocker, nebivolol. METHODS A total of 72 heart failure patients with systolic dysfunction were included in the study. Corrected QT (QTc) and QT dispersion (QTcd) were measured manually by two independent o...

BACKGROUND QT interval parameters have been suggested as a predictor of lethal arrhythmia and mortality in patients with myocardial infarction. The aim of the present study was to compare the value of QT interval indices in patients presenting with non-ST-segment elevation myocardial infarction (NSTEMI) between a group of patients with type 2 diabetes mellitus and a nondiabetic group of patient...

BACKGROUND Churg-Strauss syndrome (CSS) is a rare, systemic necrotising small and middle-sized vessel vasculitis, accompanied by blood eosinophilia, eosinophil infiltration of various tissues and bronchial asthma. Cardiac injury caused by myocardial eosinophilic infiltration and/or vasculitis in CSS seems to be very common. Active inflammatory process accompanied by myocardial fibrosis has been...