Aetiology of bundle-branch block.

Aetiology of bundle-branch block.

During the past five years 161 cases of bundlebranch block have been seen in the Cardiac Department of St. Vincent's Hospital. These patients have been evaluated clinically in an attempt to identify all possible associated and causative factors. This communication deals with these various factors and attempts to identify their relative importance in the genesis of both types of conduction defec...

Incomplete Bundle Branch Block.

Lewis (1925) stated that delay in the passage of the impulse down a bundle branch could alter materially the form of the electrocardiogram. Wilson (1940) defined incomplete bundle branch block as due to a conduction defect that merely retards the passage of the impulse through one of the main bundle branches, and stated that it gives rise to electrocardiograms which are " transitional, both as ...

Bilateral bundle branch block.

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. ...

Transient Bundle-branch Block.

IN a recent survey of 167 patients with buIndle-branch l)lock 1 10 in.stances of transient bundle-branch block were discovered. Since the completion of this study four more patients with this condition have been encountered. These 14 patients represent the subjects of this report. Transient bundle-branch block is defined as an intraventricular conduction defect that subsequently returns, if onl...