CASTELLANOS, A., JR & LEMBERG, L. (1966) Post-infarction conduction disturbances, Vectorcardiography-1965 (Ed. by I. Hoffman and R. C. Taymor), p. 219. North-Holland, Amsterdam. ROBERTSON, P.G.C., EMSLIE-SMITH, D., LOWE, K.G. & WATSON, H. (1963) The association of type B ventricular pre-excitation and right bundle-branch block. Brit. Heart J. 25, 755. SCOTT, R.C. (1965) Left bundle-branch block...

His bundle electrograms were recorded in four patients with ectopic rhythms showing a right bundle-branch block superior axis pattern. In one case what appeared to be a slow idioventricular rhythm was identified as a His bundle rhythm with transient right bundle-branch block and left anterior hemiblock. The second patient had an idioventricular tachycardia. H deflections were not seen in front ...

WHEN a normal impulse of supraventricular origin arrives at the His bundle, the entire specialized conduction system has had ample time to recover from the preceding response; the activation sequence of the ventricles and the resulting QRS complex are <'normal." When a lesion permanently damages one of the major divisions of the common bundle, the ventricular activation sequence is permanently ...

Twenty-seven patients with complete right bundle-branch block as the only abnormal finding were studied using high speed M-mode echocardiography to determine the effect of the electrical delay on the mechanical events of right ventricular systole. Pulmonary valve opening (PVOm) was delayed in all cases. In some the delay was mainly between mitral valve closure (MVC) and tricuspid valve closure ...

A histological study by serial sections of the conduction system was performed in a case of 84-year-old female with a diagnosis of hypertension and complete atrioventricular (AV) block. The course of her electrocardiogram was divided into 6 stages as follows: 1) left ventricular hypertrophy (11 years before), 2) complete right bundle branch block (CRBBB) and no axis deviation with PQ interval o...

The Purkinje system (PS) and the His bundle have been recently implicated as an important driver of the rapid activation rate after 1-2 minutes of ventricular fibrillation (VF). It is unknown whether activations during VF propagate through the His-Purkinje system to other portions of the the working myocardium (WM). Little is known about restitution characteristic differences between the His bu...

BACKGROUND Biventricular (BiV) and left ventricular (LV) pacing similarly augment systolic function in left bundle-branch block (LBBB)-failing hearts despite different electrical activation. We tested whether electrical synchrony is required to achieve mechanical synchronization and functional benefit from pacing. METHODS AND RESULTS Epicardial mapping, tagged MRI, and hemodynamics were obtai...

Objectives. We sought to assess the outcome of patients with acute myocardial infarction (MI) and bundle branch block in the thrombolytic era. Background. Studies of patients with acute MI and bundle branch block have reported high mortality rates and poor overall prognosis. Methods. The North American population with acute MI and bundle branch block enrolled in the Global Utilization of Strept...

A 59-year-old male patient was admitted with the main complaints of stuffiness and shortness of breath. An ECG from precordial leads on admission showed masquerading bundle branch block. Syncope frequently occurred after admission. During syncope episodes, ECG telemetry showed that the syncope was caused by intermittent complete atrioventricular block, with the longest RR interval lasting for 4...