5-羟色胺对大鼠心肌单相动作电位及室性心律失常的影响

The effects of serotonin on myocardial monophasic action potential and ventricular arrhythmia in rats

为探讨5-HT与缺血性室性心律失常的关系,观察了外源性5-HT对大鼠在体缺血心肌单相动作电位(MAP)及心电图的影响。结果证实(1)5-HT使心肌缺血动物DVA的VE数目增加,VT、VF持续时间延长,而不造成非心肌缺血动物的室性心律失常。(2)5-HT对缺血心脏DVA的影响不是通过MAPD的延长,而是与缺血心肌Vmax及MAPA有关。

In order to study the relationship between 5-HT and ischemic ventriculararrhythmia we observed the effects of exogenous 5-HT on MAP and ECG of rats withischemic myocardium. The conclusion was that: (1) 5-HT increased the number of VEand prolonged the duration of VT and VF in DVA phase of rats with ischemic myocar-dium. But it could not produced the ventricular arrhythmia on rats without ischemic my-ocardium。(2) The effects of 5-HT mentioned in (1) was attributed to decreased Vmaxand MAPA of ischemic myocardium by 5-HT but it was not due to prolongation ofMAPD.