Chronotropic, inotropic, dromotropic and coronary vasodilator effects of bisaramil, a new class I antiarrhythmic drug, assessed using canine isolated, blood-perfused heart preparations.
The cardiovascular effects of a new class I antiarrhythmic drug, bisaramil, were examined using canine isolated, blood-perfused heart preparations. Bisaramil exerted negative chronotropic, inotropic and dromotropic effects as well as coronary vasodilator action, which are qualitatively the same as those of classical class I drugs. The selectivity of bisaramil for the intraventricular conduction vs the other cardiac variables was compared with that of disopyramide and flecainide. Bisaramil was the most selective for intraventricular conduction, while it was the least selective for ventricular muscle contraction. We conclude that bisaramil may become a useful antiarrhythmic drug with less cardiac adverse effects.
Haruno
A
A
Department of Pharmacology, Yamanashi Medical University, Nakakoma-gun, Japan.
Sugiyama
A
A
Hashimoto
K
K
D000818:Animals; D000889:Anti-Arrhythmia Agents / Q000494:pharmacology*; D001283:Atrioventricular Node / Q000187:drug effects / Q000502:physiology; D001783:Blood Flow Velocity / Q000187:drug effects; D019086:Bridged Bicyclo Compounds, Heterocyclic / Q000494:pharmacology*; D002722:Chlorobenzenes; D003331:Coronary Vessels / Q000187:drug effects* / Q000502:physiology; D004206:Disopyramide / Q000494:pharmacology; D004285:Dogs; D005260:Female; D005424:Flecainide / Q000494:pharmacology; D006321:Heart / Q000187:drug effects* / Q000294:innervation / Q000502:physiology; D006339:Heart Rate / Q000187:drug effects; D066298:In Vitro Techniques; D008297:Male; D009200:Myocardial Contraction / Q000187:drug effects; D015425:Myocardial Reperfusion; D012849:Sinoatrial Node / Q000187:drug effects / Q000502:physiology; D014664:Vasodilation / Q000187:drug effects
D000889:Anti-Arrhythmia Agents; D019086:Bridged Bicyclo Compounds, Heterocyclic; D002722:Chlorobenzenes; C045644:bisaramil; D004206:Disopyramide; D005424:Flecainide