Effect of daurisoline on monophasic action potential of rabbit hearts in vivo
- VernacularTitle:蝙蝠葛苏林碱对家兔在体心脏单相动作电位的影响
- Author:
Zhen LI
;
Xianming LIN
;
Jingsheng XIA
;
Xiaoyan YANG
;
Peili GONG
;
Fandian ZENG
- Publication Type:Journal Article
- From:
Chinese Journal of Pharmacology and Toxicology
2001;15(2):116-120
- CountryChina
- Language:Chinese
-
Abstract:
The use-dependent characteristics of daurisoline on monophasic action potentials (MAP) of the left ventricle of the rabbit heart in situ were recorded with MAP recording technique. The results showed that daurisoline decreased monophasic action potential amplitude (MAPA) and prolonged monophasic action potential duration at the 50% and 90% (MAPD50, MAPD90), effective refractory period (ERP), ERP/MAPD90 at the steady-state cycle lengths of 240, 210, 180 ms. The percent of prolongation of MAPD50 was 12.8±2.9, 9.5±2.6, 9.0±1.6, that of MAPD90 was 10.9±2.6, 7.5±2.4, 6.5±2.7, that of ERP was 25.7±4.3, 18.5±4.1, 24.2±7.2, and that of ERP/MAPD90 was 13.7±4.5, 10.2±2.2, 16.1±5.1, respectively. Its effect showed no relation to frequency (n=6, P>0.05). The effects of sotalol on MAP were similar to that of daurisoline, but it prolonged MAPD90 and ERP in a reverse use-dependent manner (P<0.05). It is concluded that daurisoline has no use-dependent effects on MAP of rabbit hearts.
