关键词: 迷走神经;动作电位时程;心外膜电图;QT间期

    摘 要:目的 观察迷走神经刺激对兔心室肌复极间期的调节作用. 方法 分离、结扎并剪断兔双侧颈迷走、交感神经，电刺激迷走神经外周端.心室复极时程以体表心电图(ECG)II导联QT间期、心外膜电图(EPG)的QT间期及采用玻璃微电极技术记录的动作电位时程(APD90 ，APD50 )表示. 结果 刺激迷走神经时，在自然心率状态下，ECG II导联及EPG中QT间期、APD均明显延长;起搏消除HR影响后，迷走神经刺激使QT间期及APD缩短. 结论 迷走神经兴奋使非起搏状态下心室肌复极延缓，而使起搏状态下心室肌的复极加速.

    Vagal nerves control of ventricular repolarization

    CAO Yan-Jie，JIA Guo-Liang ，LI Lan-Sun，WANG Yue-Min ，CHENG He-Xiang，ZHANG Rong-Qing

    1 Department of Cardiovasology，Xijing Hospital，2 Department of Physiology，Faculty of Preclinical Medicine，Fourth Military Medical University，Xi'an710033，China

    Keywords:vagal nerves;APD;epicardiogram;QT interval

    Abstract:AIM To observe the effect of stimulation of vagal nerves on ventricular repolarization.METHODS Bilateral cervical vagi and sympathetic nerves were dissociated，ligated and cut，peripherical end of the vagal nerves was stimulated.QT-interval of ECG leadII and EPG and APD90 ......