Effect of adrenaline on cardiac force-interval relationship

Cardiovascular Research
A J Drake-HollandM I Noble

Abstract

The aim was to test the hypothesis that adrenaline affects the force-interval processes. The force-interval processes were studied in eight guinea pig papillary muscles (isometric force) and five anaesthetised dogs with atrioventricular block (maximum rate of rise of left ventricular pressure, LVdP/dtmax). The contractility indices were measured during pacing sequences in which a steady state was interrupted after a variable interval by a premature beat followed by an immediate return to the steady state. The relationship between contractility of the premature beat and the preceding interstimulus interval displays an approximately monoexponential initial rising phase, ie, mechanical restitution. With increasing adrenaline dosage in the isolated preparation there was always a significant increase in the force, and in its rate of rise with interval in some cases. Adrenaline had a variable accelerating effect on the time course of this mechanical restitution in isolated papillary muscles, but no effect in the dog preparation. In the isolated preparation adrenaline also slowed the decay in potentiation of the two beats immediately following the premature contraction. A slope of the relationship between the contractility of the seco...Continue Reading

Citations

Nov 14, 1997·Bulletin of Mathematical Biology·Z KnudsenJ Brindley
Jul 1, 1995·British Journal of Clinical Pharmacology·Y I ZhangJ D Horowitz
Aug 19, 2007·Journal of Colloid and Interface Science·Hideo AkisadaHiromitsu Kaneda
Dec 4, 2004·Journal of Colloid and Interface Science·Md Nazrul Islam, Teiji Kato
Jun 2, 2005·Journal of Colloid and Interface Science·Hideo AkisadaAtsuko Yamada
Oct 15, 1995·Circulation·J RossK H Ryu
Jan 30, 2003·FASEB Journal : Official Publication of the Federation of American Societies for Experimental Biology·Takayoshi IsodaD A Kass

Related Concepts

Metazoa
Diastolic Blood Pressure
Canis familiaris
Epinephrine Acetate
Cavia porcellus
Myocardial Contraction
Structure of Papillary Muscle
Left Ventricular Function

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