was common (49%), and evidence is produced which suggests that it is probably the result of the ventriculotomy rather than direct trauma to the right bundle. Right bundle-branch block with left anterior hemiblock was less common (II%). Right bundle-branch block with left anterior hemiblock, especially if associated with a prolonged PR interval (trifascicular block), may predispose to complete a...

A case of 70-year-old woman with ischemic heart disease is presented. The electrocardiogram showed atrial fibrillation and a tachycardia-dependent, left bundle branch block. A number of intermediate QRS patterns from normal intraventricular conduction to complete left bundle branch block were seen, and the transition was gradual. Increasing grades of aberrance were seen following a shorter prec...

The present study describes the clinical and electrophysiological characteristics of sustained bundle branch reentrant ventricular tachycardia treated with electrical ablation of the right bundle branch. Seven patients presented with syncopal episodes, and six of the seven had documented episodes of ventricular tachycardia. All patients had depressed left ventricular ejection fraction with card...

Endocardial catheter mapping was performed in 18 patients with left bundle branch block (LBBB). Four patients had no organic heart disease (group I), six had cardiomyopathy (group II), and eight had coronary artery disease and previous infarction (group III). Twelve patients had one septal site of left ventricular endocardial breakthrough, while six had two left ventricular endocardial breakthr...

Cardiac pacing through a transvenous catheter located in the right ventricle usually produces a pattern of left bundle branch block (LBBB). When right bundle branch block (RBBB) occurs during apparent right ventricular pacing, a complication (perforation or malposition of the catheter) has usually occurred. In the patient reported here, uncomplicated right ventricular transvenous pacing produce...

A 52-year-old woman underwent an electrophysiologic prtKedure because of a 30-year history of recurrent episodes of paroxysmal tachycardia. The baseline sinus cycle length wa.s 600 msec and the QRS complexes had a left bundle branch block configuration, with a QRS duration of 120 msec. The atrial-His (AH) and His-ventricular (HV) intervals were 90 and 20 msec, respectively. Programmed atrial st...

We present the case of a 72-year-old male who underwent a permanent transvenous DDD pacemaker implantation for symptomatic complete heart block. The postoperative surface electrocardiogram (ECG) revealed a right bundle branch block (RBBB) pacing pattern with transition in lead V3 and left bundle branch block (LBBB) in D1, suggesting a malpositioned ventricular lead in the left heart. Malpositio...

OBJECTIVE The purpose of this study is to report prospectively the results of six-month follow-up of permanent left ventricular (LV) based pacing in patients with severe congestive heart failure (CHF) and left bundle branch block (LBBB). BACKGROUND Left ventricular pacing alone has been demonstrated to result in identical improvement compared to biventricular pacing (BiV) during acute hemodyn...

Right bundle-branch block occurred in 42.8% and left anterior hemiblock in 35% of 14 patients after surgical replacement of the tricuspid valve. The combination of RBBB with left anterior hemiblock is caused by injury to the branching portion of the bundle of His or more likely, by a lesion involving the pseudobifurcation. This study provides further proof that left anterior hemiblock may be pr...

We describe a 73-year-old woman with a history of breast cancer and metastatic disease diagnosed in January 2002 (stable when we saw her) who was admitted for sudden dyspnea and presyncope. Complete atrioventricular block was documented, and a temporary pacemaker was implanted. Eight hours after admission she recovered sinus rhythm with left bundle branch block as seen in previous recordings. C...