Comparison of Cardiovascular Effects of a Novel Class Ic Antiarrhythmic Agent, NIK-244, with Those of Flecainide in Isolated Canine Heart Preparations Cross-Circulated with a Donor Dog.
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概要
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To assess the cardiovascular effects of a new class I antiarrhythmic agent, NIK-244, and to compare them with those of flecainide, canine isolated, sinoatrial node, papillary muscle and atrioventricular node preparations cross-circulated with a donor dog were used. NIK-244 injected intraarterially into the isolated preparations showed dose-related negative chronotropic, negative inotropic, and coronary vasodilator effects, which are comparable to those of flecainide, and it also showed a dose-related negative dromotropic effect on both atrio-His (AH) and His-ventricular (HV) conduction. The prolongation of AH interval by NIK-244 was significantly more potent than that by flecainide, while that of the HV interval by NIK-244 was slightly more potent, but not significantly, compared with that by flecainide. NIK-244 administered intravenously into the donor dog showed bradycardic and depressor effects in both the donor dog and the cross-circulated sinus node and papillary muscle preparations, which are comparable to the effects of flecainide. Although the negative dromotropic effects of NIK-244 on both the donor dog heart and the cross-circulated atrioventricular node preparation started more slowly, they were more potent and longer-lasting than those of flecainide. Our results suggest that NIK-244 may be a more powerful and longer-lasting antiarrhythmic agent than flecainide, since the anti-arrhythmic action of class I drugs is considered to result from inhibition of the fast inward current, which is the most important depolarizing current responsible for the intraatrial and His-Purkinje-ventriclar conduction.
- 公益社団法人 日本薬理学会の論文
著者
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SUGIYAMA Atsushi
Second Department of Internal Medicine, Yamanashi Medical College
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HASHIMOTO Keitaro
Department of Phamacology, Yamanashi Medical University
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Motomura Shigeru
Department of Pharmacalogy, Respiratory Medicine and Nephrology, Hirosaki University Graduate School of Medicine
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