bundle-branch block


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bun·dle-branch block (BBB),

intraventricular block due to interruption of conduction in one of the two main branches of the atrioventricular bundle and manifested in the electrocardiogram by marked prolongation of the QRS complex; block of each branch has distinctive QRS morphology.

bundle-branch block

A defect in the passage of electrical impulses through either the right or left branches that divide from the bundle of His, which supply the “wiring” for the right and left ventricles, often resulting in delayed conduction though either bundle branch.

Clinical findings
Generally asymptomatic; if symptomatic, fainting, slowed heart rate.

Aetiology
Cardiomyopathy, myocarditis, infarction, post-surgery.

bun·dle-branch block

(bŭn'dĕl-branchblok)
Intraventricular block due to interruption of conduction in one of the two main branches of the bundle of His and manifested in the electrocardiogram by marked prolongation of the QRS complex. Block to each branch has distinctive QRS morphology.
References in periodicals archive ?
Treatment and outcomes of left bundle-branch block patients with myocardial infarction who present without chest pain.
Prediction of cardiac events in patients having left bundle-branch block with/without chest pain using dipyridamole technetium-99m-sestamibi myocardial perfusion imaging.
Kontos MC, Aziz HA, Chau VQ, Roberts CS, Ornato JP, Vetrovec GW (2011) Outcomes in patients with chronicity of left bundle-branch block with possible acute myocardial infarction.
Fresco et al., "Cumulative effect of complete left bundle-branch block and chronic atrial fibrillation on 1-year mortality and hospitalization in patients with congestive heart failure: a report from the Italian network on congestive heart failure (in-CHF database)," European Heart Journal, vol.
Abnormal T waves can indicate myocardial ischemia or infarction, pericarditis, hyperkalemia, ventricular hypertrophy, bundle-branch block, or subarachnoid hemorrhage (Huff, 2006).
In our post-treatment follow-up, chronic Chagas disease is indicated in three patients on the basis of these ECG findings: left anterior fascicular block, atrioventricular dissociation and intermittent left bundle-branch block, and right bundle-branch block and left posterior fascicular block, despite there being no clinical manifestation of these conditions.
Bundle-branch block in middle-aged men: risk of complications and death over 28 years The Primary Prevention Study in Goteborg, Sweden.
The American College of Cardiology and the American Heart Association revised their guidelines in 1999, elevating early mechanical intervention for cardiogenic shock to a class I recommendation for patients younger than 75 with an ST-elevation left bundle-branch block acute MI.
The study enrolled patients with ST segment--elevation MI or new bundle-branch block who presented within 12 hours of symptom onset.
Schlapfer, "Atrial fibrillation, complete atrioventricular block and escape rhythm with bundle-branch block morphologies: an exceptional presentation of Lyme carditis," International Journal of Cardiology, vol.