Open AccessElectromechanical concordance in alternans during sustained tachycardias
Author(s) -
Tai YauTing,
Lau ChuPak,
Chow WingHing,
Leung WingHung
Publication year - 1991
Publication title -
clinical cardiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.263
H-Index - 72
eISSN - 1932-8737
pISSN - 0160-9289
DOI - 10.1002/clc.4960141212
Subject(s) - medicine , concordance , cardiology , supraventricular tachycardia , tachycardia , mechanism (biology) , ventricular tachycardia , electrocardiography , physics , quantum mechanics
Electrical alternans and mechanical alternans are intriguing phenomena that have been reported to occur during tachycardias. Their precise pathophysiologic mechanism and in particular their interrelation have not been well defined. This report documents an unusual electromechanical concordance in alternans during sustained supraventricular tachycardia and ventricular tachycardia in two patients, raising interesting possibilities on the underlying mechanism of the concordant phenomena. The findings highlight the principle of excitation‐contraction coupling of the heart.