PMID: 6398060Nov 1, 1984Paper

The influence of cardiac cholinergic activation on the induction and maintenance of ventricular fibrillation

Basic Research in Cardiology
G AmitzurM Weinstock

Abstract

The influence of cardiac cholinergic activation was studied in rats and cats on the induction and maintenance of ventricular fibrillation (VF). Acetylcholine (ACH 2-25 micrograms/kg), in doses which did not cause bradycardia or hypotension, induced appearance of spontaneous VF (duration 2-60 sec.) in 9/20 rats which have a high sympathetic autoregulation and in 3/6 cats only, 20-40 secs after the latter had been given adrenaline. ACh (10-45 micrograms/kg) and methacholine (10-40 micrograms/kg) also significantly prolonged the fibrillatory period induced electrically in cats and rats with and without atrial or ventricular pacing. The induction or prolongation of VF did not occur when higher doses of ACh (50-100 micrograms/kg) were given to rats. The influence of moderate amounts of cholinergic agents on the heart may be due to localised effects resulting in asynchronous activity. Alternatively, they may produce a discharge of multiple ectopic pacemakers or a disturbance in impulse conduction. Higher doses of ACh depress the S-A and ventricular ectopic activity node thereby decreasing the probability of inducing VF. It is concluded that under conditions of raised cardiac adrenergic activity, a moderate increase in cholinergic inf...Continue Reading

References

Jun 1, 1975·American Heart Journal·T WeissK Engelman
Jul 8, 1972·British Medical Journal·S W WebbJ F Pantridge
Aug 1, 1966·The American Journal of Cardiology·S Alexander, W C Ping
Feb 1, 1964·American Heart Journal·G K MOEJ A ABILDSKOV
Nov 1, 1961·American Heart Journal·D SCHERFM YILDIZ

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