Protective effect of verapamil upon ouabain-induced cardiac arrhythmias.

Abstract:

:Protective influence of verapamil upon ouabain-induced cardiac arrhythmias was investigated in anesthetized (alpha-chloralose 60 mg/kg and urethane 500 mg/kg) open-chest guinea pigs. Verapamil in doses between 100 and 150 micrograms/kg significantly increased (80-90%) the dose of ouabain, necessary to cause ventricular arrhythmias. This was also associated with a larger survival rate. A larger dose of verapamil (225 micrograms/kg) caused a further increase in the dose of ouabain, necessary for the initiation of arrhythmias, but in all the cases second or third degree heart block occurred. Verapamil (150 micrograms/kg) also prevented the development of fatal arrhythmias and death, when it was administered at the onset of ventricular ectopy. However, once the arrhythmias were firmly established, verapamil was ineffective in reversing the toxic response. The data suggests that verapamil exerts a protective effect against the development of digitalis-induced cardiac arrhythmias in doses which are comparable to therapeutic levels in humans. The larger doses of verapamil, however, will be contradicted because of the slowing of AV node and the likelihood of complete heart block.

journal_name

Pharmacology

journal_title

Pharmacology

authors

Khatter JC,Navaratnam S,Hoeschen RJ

doi

10.1159/000138326

subject

Has Abstract

pub_date

1988-01-01 00:00:00

pages

380-9

issue

6

eissn

0031-7012

issn

1423-0313

journal_volume

36

pub_type

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