Rate-dependent left bundle branch block caused by hyperkalaemia

Left bundle branch block in serious hyperkalaemia: rate-dependency?

Fransen et al. [1] published a Heart Beat in this journal showing a case with rate-dependent left bundle branch block (LBBB) in a patient with serious hyperkalaemia. Critical appraisal of the ECGs, however, suggests that the hyperkalaemia by itself may be the explanatory mechanism of the LBBB rather than the increased heart rate. As shown in Fig. 1, the QRS complex immediately following a prolo...

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...

Intraoperative Detection of Rate Dependent Left Bundle Branch Block

Rate dependent left bundle branch block (RDLBBB) is an uncommon case. RDLBBB is defined as an intraventricular conduction defect that may return, if only temporarily, to sinus rhythm at lower heart rates. It appears when the heart rate exceeds a certain critical value. Although RDLBBB is usually benign, its diagnosis and treatment have clinical importance for association of RDLBBB and myocardia...

The Rate Dependent Bundle Branch Block

A chronic hypertensive patient with electrocardiogram (ECG) showing left bundle branch block (LBBB) was given general anesthesia for right modified radical mastectomy. Her ECG reverted to normal sinus rhythm intermittently during peri-operative period. This intermittent ratedependent LBBB is a rare entity. Though hypertension is one significant co-morbid condition, the risk evalution of LBBB du...