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Intermittent Fascicular Extrasystoles Producing Pseudo AV Block: Electrophysiologic Effects of Beta Agonists and Antagonists
Author(s) -
NALOS PETER C.,
MANDEL WILLIAM J.,
GANG ELI S.,
CAIN RICHARD P.,
MASSUMI RASHID A.,
PETER THOMAS
Publication year - 1987
Publication title -
pacing and clinical electrophysiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.686
H-Index - 101
eISSN - 1540-8159
pISSN - 0147-8389
DOI - 10.1111/j.1540-8159.1987.tb06136.x
Subject(s) - medicine , beta (programming language) , cardiology , pharmacology , anesthesia , computer science , programming language
This report describes a pntient with pseudo‐type II second‐degree AV block due to an intermittent parasystolic focus located in the left bundle branch. A paradoxical increase in the fascicular rate was seen following intravenous propranolol, and fascicular extrasystoles were suppressed after intravenous isoproterenol treatment. All propagated fascicular extrasystoles were conducted to the ventricle with incomplete or complete right bundle branch block and a decrease in the H'‐V interval compared to the H‐V interval during sinus rhythm. Treatment with oral quinidine abolished fascicular extrasystoles without worsening of AV conduction.