Fig. 3.?Electrocardiogram, showing apparent bundle branch block (right-sided) and ventricular extra-systoles. The short duration' of P-R and the widening of the QRS complexes are characteristic. (Date of tracing : 22-4-40.) Fig. 3.?Electrocardiogram, showing apparent bundle branch block (right-sided) and ventricular extra-systoles. The short du of P-R and the widening of the QRS complexes are c...

BACKGROUND Numerous local anesthetics have an asymmetric tetrahedron carbon, which confers stereoselective differences between the isomers. The authors attempted to quantify the depressant effect of racemic bupivacaine, levobupivacaine, and ropivacaine on myocardial ventricular conduction and on myocardial contractility. METHODS The authors studied the pharmacokinetics (outflow concentration)...

BACKGROUND Heart failure (HF) is associated with considerable mortality. The electrocardiographic frontal QRS-T angle is a simple parameter to measure, reflects changes in the direction of the repolarization sequence and predicts outcome in patients with HF. Data regarding temporal changes in the frontal QRS-T angle in patients with HF and its impact on outcome is limited. AIM To evaluate tem...

Poisoning with tricyclic antidepressants is an important cause of drug-related self-poisoning in the developed world and a very common cause of poisoning and mortality in developing countries. Electrocardiographic manifestations of most tricyclic antidepressant-poisoned patients resolve by the administration of 1-2 mEq/kg of sodium bicarbonate. Some rare cases have been reported who have been r...

OBJECTIVES The purpose of the study was to describe the configuration, and investigate the mechanisms, of QRS changes occurring during percutaneous transluminal coronary angioplasty (PTCA). BACKGROUND QRS changes during PTCA have been attributed to both a passive ST segment shift and conduction disturbances (peri-ischemic block). The direct relation between ST segment shift and QRS changes, h...

A n obese (5 feet 5 inches, 224 pounds) 57-year-old woman with high blood pressure, diabetes mellitus, and arthritis underwent arthroscopy for a painful left knee. After the procedure, the electrocardiographic monitor in the recovery room showed alternately narrowing and widening QRS complexes, and a 12-lead electrocardiogram was obtained (Figure). e first three QRS complexes are wide (0.17 se...

BACKGROUND There is a controversy regarding the association between QRS width and ventricular arrhythmias (VAs). We hypothesized that predictive value of the QRS width could be improved if QRS width were considered in the context of the sum magnitude of the absolute QRST integral in 3 orthogonal leads sum absolute QRST integral (SAI QRST). We explored correlations between QRS width, SAI QRST, a...