background: many factors influence the prognosis of patients with (chf), among these; more attention has been focused on the role of left bundle branch block (lbbb).  the present study was performed to find out the prevalence of chf in lbbb patients. methods: in this cross-sectional study, 246 were diagnosed consecutive patients with lbbb pattern in ecg during july 2004 until october 2006 at im...

Two patients who developed left bundle-branch block with increase in heart rate are presented. Atrial pacing during His bundle recording studies showed differing responses in the ventricular specialized conduction system of the two patients. In one, the onset of left bundle-branch block was associated with no change in the previously normal HVinterval (so msec), while in the second the HV inter...

To date the electrophysiological mechanism responsible for aberrant intraventricular conduction of critically timed premature supraventricular impulses has not been documented. Microelectrode techniques were used to measure in vitro action potential and refractory period durations of the canine proximal right and left bundle branches equidistant from the distal bundle of His. Both measurements ...