A depressed young woman attempted suicide by taking approximately 2 g of nortriptyline. She had multiple seizures, a systolic blood pressure of 50 mm Hg, and a respiratory arrest and was comatose when brought by ambulance to the emergency department, where she was immediately intubated. The electrocardiogram recorded on admission shows a minimally irregular wide-QRS tachycardia with a long QT i...

OBJECTIVES The aim of the study was to evaluate the effectiveness of cardiac resynchronization therapy (CRT) in patients with refractory heart failure (HF) and incomplete left bundle branch block ("narrow" QRS), together with echocardiographic evidence of interventricular and intraventricular asynchrony. BACKGROUND Cardiac resynchronization therapy has been proven effective in patients with H...

BACKGROUND After an acute myocardial infarction (MI), it is important to define the infarct size because it is related to mortality and morbidity. The Selvester QRS Score is an electrocardiographic (ECG) method that has been developed for estimating MI size. It has been shown to correlate well with postmortem anatomically measured sizes of single MI in patients who did not receive thrombolytic ...

OBJECTIVE To investigate the presence of myocardial fibrosis determined by fragmented QRS in patients with severe aortic valve stenosis. SUBJECTS AND METHODS Eighty-seven consecutive patients with severe aortic valve stenosis and 83 age- and gender-matched control subjects were enrolled into this study. Severe aortic valve stenosis was defined as an aortic valve area <1 cm(2), a Vmax >4 m/s, ...

INTRODUCTION Time voltage area of QRS is a parameter that showed a close association with modifications in endoventricular volume. The aim of the study was to investigate the efficacy of this parameter in identifying progressive reduction in circulating blood volume (BV) during haemodialytic treatment (HT). MATERIAL AND METHODS Thirteen uraemic patients were studied. XYX like leads were monit...

Cardiac resynchronization therapy (CRT) has been demonstrated to improve symptoms and survival in patients with left ventricular (LV) systolic dysfunction and dyssynchrony. To achieve this goal, the LV lead should be positioned in a region of delayed contraction. We hypothesized that pacing at the site of late electrical activation was also associated with long-term response to CRT. We conducte...

Background: The main target of treatment STEMI is to restore coronary blood flow and maintain myocardial perfusion. Several tools including electrocardiographic angiographic parameters are used assess reperfusion. Fragmented QRS associated with increased adverse cardiovascular events, it was proved bea marker ventricular dysfunction poor prognosis in STEMI. Aim the work : To study relation betw...

Aim: Frequent premature ventricular contractions (PVCs) can cause impaired function or dilatation of cavities. The frontal plane QRS-T [f(QRS-T)] angle is an indicator instability in the electrophysiological properties myocardium and associated with arrhythmias. present study aimed to investigate whether f(QRS-T) angle, as a marker repolarization heterogeneity, predicts contraction burden ambul...

Delay between ventricular pacing stimulus and QRS onset (S-QRS delay), often seen in regions of myocardial fibrosis, suggests conduction along a protected channel which represents substrate for re-entrant arrhythmias. 1. To analyze the relationship site exit with stimulus-QRS delay imaging-defined fibrosis undergoing VT ablation 2. consider time these two locations. Six patients structural hear...

OBJECTIVE To investigate the relative effects of left ventricular mass and conduction disturbance on the duration and axis of the QRS complex in patients with left ventricular hypertrophy and a normal cavity size. STUDY DESIGN Retrospective and prospective study of 42 patients with pathological left ventricular hypertrophy and 17 normal controls by electrocardiography, echocardiography, and p...