Electrophysiological changes in the canine atrium and ventricle during progressive hyperkalaemia: electrocardiographical correlates and the in vivo validation of in vitro predictions

Cardiovascular Research
M F ArnsdorfR W Childers

Abstract

The electrophysiological response to hyperkalaemia was reinvestigated in the whole dog for several reasons including: the paucity of comparative electrophysiological and electrocardiographical studies in which atrial and ventricular tissues were simultaneously investigated; the contrast between the clarity of findings in previous in vitro studies as compared with the rather conflicting results in earlier in vivo investigations; and the difficulty in validating the extrapolation from in vitro results and theory to the in vivo situation because of deficiences in the literature. Biphasic alterations in atrial and ventricular conduction times as well as excitability in response to progressively increasing hyperkalaemia were documented. The alterations in conduction times were reflected quite accurately by relevant electrocardiographical changes. Experiments in the whole animal were designed to test predictions based on membrane theory: the results offering strong support for the validity of extrapolating from the in vitro to the in vivo situation. The results of this study should help clarify and render interpretable many of the seemingly conflicting results in the literature.

Citations

Oct 1, 1991·Journal of the American College of Cardiology·D E FitzovichD B Young
Jan 1, 1996·Journal of Electrocardiology·R Childers
Jun 17, 2008·Journal of Electrocardiology·R Childers
Mar 21, 2008·Journal of Electrocardiology·Mohamad C N SinnoSanjaya Khanal
Aug 27, 2011·Pharmacology & Therapeutics·Alexander Burashnikov, Charles Antzelevitch
Nov 1, 1986·The American Journal of Cardiology·T FeldmanR Childers
Nov 1, 1984·Pacing and Clinical Electrophysiology : PACE·R W Childers

Related Concepts

Metazoa
Canis familiaris
Electrocardiographic Recorders
Electrophysiology (Science)
Heart
Right Atrial Structure
Cardiac Conduction System
Left Ventricular Structure
Hyperkalemia

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