Quinidine attenuates sympathetically induced poststenotic myocardial ischemia.

Abstract:

:Beside its antiarrhythmic properties, which in particular are used for the treatment of atrial fibrillation, quinidine is known to have alpha-adrenoceptor blocking properties. On the other hand, atrial fibrillation is reported to cause activation of the sympathetic nervous system which, in turn, reduces coronary blood flow when the coronary reserve is already compromised. Therefore, we tested the effect of quinidine (3 mg/kg i.v.) on the coronary vasculature during electrical stimulation of cardiac sympathetic nerves in the presence and absence of a stenosis on the left circumflex coronary artery. In 7 anesthetized dogs the end-diastolic distal coronary resistance during cardiac sympathetic nerve stimulation in the presence of a severe stenosis on the left circumflex coronary artery increased by 18% before, and decreased by 17% after administration of quinidine. We conclude that quinidine inhibits the vasoconstriction of poststenotic coronary arteries during cardiac sympathetic nerve stimulation and thus might prevent a poststenotic stress-induced myocardial ischemia.

journal_name

J Cardiovasc Pharmacol

authors

Schipke J,Schulz R,Tölle T,Heusch G,Thämer V

doi

10.1097/00005344-198712000-00003

subject

Has Abstract

pub_date

1987-12-01 00:00:00

pages

622-6

issue

6

eissn

0160-2446

issn

1533-4023

journal_volume

10

pub_type

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