侯倩,崔炜,谢瑞芹,王欢,刘静,呼海娟

• 1:河北医科大学第二医院 河北省心血管研究所心内科

摘要(Abstract)：

目的观察心肌缺血对兔左回旋支(LCX)冠状动脉内和心外膜心肌起搏阈值的影响。方法将20只健康家兔随机分为A、B两组。于LCX中点以远3～5 mm处钩置临时起搏导丝(深度:A组至LCX内,B组至LCX以下1～2 mm的肌层)。结扎LCX中点,建立兔心肌梗死模型,观察结扎前及结扎180 min内两组起搏阈值。结果 A、B两组基础起搏阈值分别为(0.82±0.12)V和(0.80±0.12)V,差异无统计学意义(P>0.05)。与基础起搏阈值相比,两组结扎后各时间点起搏阈值均明显增高,分别为(4.37±0.59)V和(3.97±0.96)V(P<0.05)。结扎前20 min,两组起搏阈值变化趋势相似;结扎10 min均急剧增高(P>0.05);结扎20 min均明显回落,分别为(2.13±0.59)V和(1.89±0.75)V(P>0.05)。自此至结扎3 h,A组起搏阈值保持该水平不变(P>0.05),B组则逐渐增高,与A组相比,差异有统计学意义[(6.86±1.65)V比(1.60±0.62)V,P<0.05]。结论心肌缺血导致兔LCX冠状动脉内和心外膜心肌起搏阈值均明显增高。缺血20～180 min,心外膜心肌起搏阈值持续升高,但LCX冠状动脉内起搏阈值维持在基础起搏阈值的2倍水平,均在可起搏频率内。

关键词(KeyWords)： 心肌缺血;冠状血管;心外膜;心脏起搏器,人工;兔

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 侯倩,崔炜,谢瑞芹,王欢,刘静,呼海娟

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