Electrophysiological actions of a new antiarrhythmic drug, bisaramil, on isolated heart preparations.

Abstract:

:Electrophysiological effects of bisaramil--a new antiarrhythmic drug under clinical trial--were investigated on isolated heart preparations, at a concentration range of 2.3-23 x 10(-6) M. Bisaramil dose dependently decreased the maximum rate of depolarization (Vmax), action potential amplitude (APA) and overshoot (OS) both in auricle and in papillary muscle of guinea-pig heart. There was no significant and obvious effect on the duration of the action potential and the resting membrane potential was also unchanged. Bisaramil slowed the spontaneous frequency of pacemaker cells in rabbit sinus node preparation due to its inhibitory effect on slow diastolic depolarization (SDD). Bisaramil was able to inhibit slow Ca(2+)-action potentials induced by isoprenaline on K(+)-depolarized papillary muscle. Results obtained with transmembrane current measurements revealed that bisaramil inhibited both fast Na(+)-current and slow Ca(2+)-current in frog sinoauricular fibres at the same concentration. Bisaramil with a mixed mode of the action seems to be a very promising drug.

journal_name

Pharmacol Res

journal_title

Pharmacological research

authors

Paroczai M,Karpati E,Marko R,Kecskemeti V

doi

10.1016/s1043-6618(05)80066-0

subject

Has Abstract

pub_date

1992-01-01 00:00:00

pages

75-85

issue

1

eissn

1043-6618

issn

1096-1186

pii

S1043-6618(05)80066-0

journal_volume

25

pub_type

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