OBJECTIVE To study differences between repetitive monomorphic ventricular tachycardia (RMVT) of right ventricular origin, and ventricular tachycardia in arrhythmogenic right ventricular dysplasia (ARVD). PATIENTS Consecutive groups with RMVT (n = 15) or ARVD (n = 12), comparable for age and function. METHODS Analysis of baseline, tachycardia, and signal averaged ECGs, clinical data, and rig...

THIS STUDY presents electrocardiographic data from six patients which indicate that (1) atrioventricular (A-V) junctional premature and escape beats may give rise to QRS complexes which differ in configuration from the QRS of sinus origin and which cannot be explained by intraventricular block or aberrant conduction during incomplete recovery, (2) QRS complexes occur which seem to be produced b...

AIMS To investigate the hypothesis that changes in the ECG over time may be an important and readily available marker of prognostic value in patients with heart failure. METHODS 112 elderly patients (81 men) with stable heart failure, a mean (SD) age of 73.3 (4.4) years, left ventricular ejection fraction 38 (17)%, and peak oxygen consumption 15.1 (4.7) ml/kg/min had ECG measurements on two o...

INTRODUCTION AND OBJECTIVES The aim of this study was to determine whether measurement of the QRS axis can help to predict outcome in patients undergoing cardiac resynchronization therapy. METHODS The study included 78 patients who had undergone successful cardiac resynchronization device implantation. Patients were classified as having either a normal QRS axis (i.e., between -30 degrees and ...

OBJECTIVES Recently published clinical guidelines recommend cardiac resynchronisation therapy (CRT) for patients with heart failure (HF) with reduced LVEF and non-left bundle branch block (non-LBBB) QRS morphology. We sought to define the potential benefit of CRT in these patients through meta-analysis of randomised controlled trials (RCTs) that have reported outcomes in patients with non-LBBB ...

BACKGROUND It is known that QRS duration is related to prognosis in acute myocardial infarction. The relation between QRS duration and coronary collateral circulation is uncertain. In the present study, we aimed to determine the relation between QRS duration and coronary collateral circulation in patients admitted with acute myocardial infarction. METHODS The present study was composed of 109...

BACKGROUND Since the first well-known electrocardiogram (ECG) delineator based on Wavelet Transform (WT) presented by Li et al. in 1995, a significant research effort has been devoted to the exploitation of this promising method. Its ability to reliably delineate the major waveform components (mono- or bi-phasic P wave, QRS, and mono- or bi-phasic T wave) would make it a suitable candidate for ...

BACKGROUND The signal-averaged electrocardiography is a noninvasive method to evaluate the presence of the potentials generated by tissues activated later than their usual timing in the cardiac cycle. The purpose of this study was to demonstrate the correlation between the filtered QRS duration obtained via the signal-averaged electrocardiography and left ventricular dimensions and volumes and ...

To facilitate the explanation of Fig. 1, the QRS complexes are labelled. The first two show a normal QRS preceded by a normal PR interval. Thereafter the QRS configuration changes. Complexes 3 to 6 show gradual widening, a frontal axis shift to horizontal and loss of the initial q in leads I and V6, an rS pattern in lead III, and the development of a left bundle branch block-like QRS configurat...

A 74-year-old man with idiopathic ventricular tachycardia (VT) with a QRS morphology with a left bundle branch block and right inferior axis underwent electrophysiologic testing. Successful ablation was achieved at the right coronary cusp (RCC) where an excellent pace map with long stimulus-to-QRS interval (St-QRS) (85 ms) was obtained. An excellent pace map was also obtained on the epicardial ...