bACKgRoUND: Fragmented QRS (fQRS), QT prolongation and wide QRS have been associated with increased risk for cardiac arrhythmias. objECTIVES: To describe the prevalence and correlates among Nigerians with heart failure. METhoDS: A total of 129 subjects were consecutively recruited for the present study. QT interval, QRS duration and fQRS were determined. SPSS version 16 was used for analysis. R...

BACKGROUND Many medications commonly used in hospitals can cause prolonged corrected QT interval (QTc), putting patients at risk for torsade de pointes (TdP), a potentially fatal arrhythmia. However, documentation of QTc for hospitalized patients receiving QT-prolonging medications is often not consistent with American Heart Association standards. OBJECTIVE To examine effects of education and...

Introduction: Ventricular arrhythmia and sudden cardiac death risk are associated with prolonged electrocardiographic (ECG) QT and Tpeak-Tend intervals. Objective: To evaluate the influence of blood pressure variables on ventricular repolarization parameters, especially QT and Tpeak-Tend intervals. Method: Two groups of patients were enrolled in the study. The firs group included 77 patients, w...

We investigated the effect of beta-adrenergic stimulation on the heart rate and QT interval in syncope children with or without coexisting ventricular arrhythmias (VA). Of the 24 children who presented with syncope or presyncope and showed negative tilt test, 13 were classified into a group with VA and the remaining 11 without VA. The provocative test was performed in bolus infusion and continu...

OBJECTIVE To analyze the effect of age on the ECG QT interval, an important predictor of cardiovascular mortality and drug-induced cardiac arrhythmias, and determine whether QT-heart rate correction formulae (QTc) have differential relationships with age and sex. METHODS Data were examined from the US National Health and Nutrition Examination Survey (NHANES) II and III, civilian population ag...

The relationship between a prolonged QT interval and an increased risk of sudden death has been extensively explored in familial long QT syndrome, sudden infant death, and ischemic heart disease (1–3). Several recent studies also describe the relation between corrected QT interval (QTc) prolongation, diabetes complications, and an increased mortality in adults (4,5). We recently described QTc p...

Two neonates with arrhythmias and the long QT syndrome are described. The arrhythmias were detected in utero and both infants were apparently well after birth. The first infant, although well, had a bradycardia for the first 9 days of life. A normal heart rate was documented at 10 days but a prolonged QT interval was not appreciated on the ECG. He was discharged from hospital but died suddenly ...

conclusions right ventricular pacing increases the qt interval without increasing the jt interval. our results confirm that jtc, as an index of repolarization, is independent of ventricular depolarization. therefore, it can be applied for predicting qtc in patients with lbbb. results stimulation from the rva increased the qtc from 456.20 ± 38.63 ms to 530.67 ± 47.73 ms at a cl of 600 (p < 0.000...

STUDY OBJECTIVE There have been 15 published cases of probable pentamidine-induced torsade de pointes (TdP). A prospective analysis of this complication of therapy is valuable considering the high frequency of Pneumocystis carinii pneumonia in the AIDS population, and the role of pentamidine in its therapy. DESIGN Open, nonrandomized, prospective study of HIV-infected patients receiving intra...