Tachycardia-Dependent Left Bundle Branch Block Associated with Bradycardia-Dependent Variable Left Bundle Branch Block

Tachycardia-dependent left bundle branch block associated with bradycardia-dependent variable left bundle branch block.

Tachycardia-Dependent Left Bundle Branch Block Associated with Bradyeardia-Dependent Variable Left Bundle Branch Block

This report describes tachyeardiaand bradycardia-dependent left bundle branch block in a patient who exhibited normal intraventricular conduction with impulses intermediate in timing. During bradyeardia, longer cycles were associated with increasing degrees of incomplete left bundle branch block. These clinical observations support the existence of slow Phase 4 depolarization of latent pacemake...

Bradycardia-Dependent Bundle-Branch Block

Four cases of bundle-branch block (BBB) occurring with slow heart rates in patients with heart disease are presented. Recognition of bradycardia-dependent BBB is often difficult, and its differentiation from ventricular escape mechanism and from bilateral BBB requires careful analysis. A set of five criteria based on our own observations is presented with a review of the literature. The respons...

Tachycardia-dependent versus bradycardia-dependent intermittent bundle-branch block.

Analysis of I6 cases with intermittent bundle-branch block showing rate-dependence revealed the presence of 12 instances with tachycardia-dependent bundle-branch block, 3 with bradycardiadependent bundle-branch block, and one instance showing both types at two different occasions. Tachycardia-dependent bundle-branch block was explained on the basis of cycle length-recovery time relation and rev...

Left Bundle Branch Block

Coronary angiography, cine left ventriculography, and the cardiovascular hemodynamics of 24 patients with left bundle branch block were studied. Seven patients were found to have significant coronary artery disease, always severe. Five had cardiomyopathy and seven had valvular disease. Only those with coronary artery disease or cardiomyopathy had abnormal left ventricular contraction patterns. ...