Alternating and Co-existing Block in the Divisions of the Left Bundle Branch

Autor: Castellanos, Agustin, Maytin, Orlando, Arcebal, Azucena G., Lemberg, Louis
Zdroj: Diseases of the Chest; August 1969, Vol. 56 Issue: 2 p103-109, 7p
Abstrakt: The tracings of two patients with acute myocardial infarction showing complete right bundle branch block and alternating block in the divisions of the left branch are presented. Both developed a type II (Mobitz) block which was attributed to a simultaneous interruption of conduction in the three main intraventricular tracts (trifascicular block). Left divisional blocks produced specific changes in the initial QRS vectors. Septal activation was considered to be a function of both divisions, rather than of the left bundle branch, a view departing from conventional electrocardiographic theory.
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