Antiarrhythmic effects of bupuranolol against canine ventricular arrhythmias induced by halothane-adrenaline or two-stage coronary ligation.

Abstract:

:We compared the beta-adrenoceptor blocking actions of bupuranolol and propranolol using the response to isoprenaline of the strength of contraction of the canine blood-perfused ventricular muscle, of the rate and strength of contraction of the isolated guinea pig heart and of a guinea pig tracheal ring preparation. The potency ratios of bupuranolol to propranolol were 3.6, 3.0, 3.4, and 2.4, respectively. Bupuranolol decreased the maximum dV/dt of the canine ventricular action potential and had no sympathomimetic action. Bupuranolol effectively suppressed halothane-adrenaline ventricular arrhythmias in the dog, reflecting its potency as a beta-adrenoceptor antagonist. In contrast, bupuranolol did not suppress ventricular arrhythmias induced by two-stage coronary ligation in the dog. Compared to propranolol and certain other antiarrhythmic drugs, bupuranolol had weaker effects on prolonging the effective refractory period than on the maximum dV/dt of canine ventricular muscle. This suggests that lengthening of the refractory period may be important for suppressing the two-stage coronary ligation arrhythmia and that the mechanism of this arrhythmia might be reentry.

journal_name

J Cardiovasc Pharmacol

authors

Hashimoto K,Tsukada T,Matsuda H,Nakagawa Y,Imai S

doi

10.1097/00005344-197903000-00004

subject

Has Abstract

pub_date

1979-03-01 00:00:00

pages

205-17

issue

2

eissn

0160-2446

issn

1533-4023

journal_volume

1

pub_type

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