Alternating bundle branch block during atrial bigeminy

Alternating bundle branch block during atrial bigeminy.

Alternate patterns of ventricular excitation may occur with any type of supraventricular bigeminy. It is a physiologic phenomenon that depends on the rate dependency of bundle-branch refractoriness and the linking phenomenon related to concealed retrograde penetration of aberrantly conducted beats into their own blocked bundle branch [1–3]. An alternate pattern of ventricular activation can onl...

Baseline left bundle branch block with right bundle branch escape complexes in a patient with coronary artery disease, presents like an alternating bundle branch block: a case report

Alternating bundle branch block (ABBB) is a less commonly encountered phenomenon with the advent of re-perfusion therapy for acute myocardial infarction. ECGs simulating the appearance of an ABBB need to be carefully analysed. We present an ECG showing a baseline Left Bundle Branch Block(LBBB) progressing to a high grade AV block with escape complexes having a Right Bundle Branch Block (RBBB) m...

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. ...