Bradycardia-dependent bundle-branch block. A critique and proposed criteria

Four cases of bundle-branch block (BBB) occurring with slow heart rates in patients with heart disease are presented. Recognition of bradycardia-dependent BBB is often difficult, and its differentiation from ventricular escape mechanism and from bilateral BBB requires careful analysis. A set of five...

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Bibliographic Details
Published in:Circulation (New York, N.Y.) N.Y.), 1968-12, Vol.38 (6), p.1066-1073
Main Author: Massumi, R A
Format: Article
Language:English
Subjects:
Adult
Aged
Bradycardia - complications
Bradycardia - physiopathology
Bundle-Branch Block - classification
Bundle-Branch Block - diagnosis
Bundle-Branch Block - etiology
Electrocardiography
Female
Heart Diseases - complications
Heart Rate
Humans
Male
Middle Aged
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Description
Summary:Four cases of bundle-branch block (BBB) occurring with slow heart rates in patients with heart disease are presented. Recognition of bradycardia-dependent BBB is often difficult, and its differentiation from ventricular escape mechanism and from bilateral BBB requires careful analysis. A set of five criteria based on our own observations is presented with a review of the literature. The responsible mechanism for this seemingly paradoxical situation is not known. However, spontaneous depolarization of one or the other of the bundle branches in late stages of diastole appears to be the most plausible explanation.
ISSN:0009-7322
1524-4539
DOI:10.1161/01.CIR.38.6.1066