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The effect of streptomycin on arrhythmia caused by stretch of isolated myocardial infarcted hearts in rats
Author(s): 
Pages: 515-518
Year: Issue:  6
Journal: CHINESE JOURNAL OF CARDIAC PACING AND ELECTROPHYSIOLOGY

Keyword:  心血管病学链霉素牵张激活非选择性离子通道机电反馈单向动作电位;
Abstract: 目的 探讨链霉素对心肌梗死(简称MI)大鼠离体心脏牵张时心律失常的影响.方法 36只wistar大鼠随机分为正常对照组、链霉素组、MI组、MI+链霉素组.离体心脏经Langendorff灌流后,通过改变水囊容积,以△V=0.1,0.2,0.3 ml对心室牵张5 s,观察牵张效应30 s,记录90%单相动作电位时程(MAPD90)、室性早搏(PVB)及室性心动过速(VT)的次数.结果 牵张使正常对照组及MI组MAPD90显著延长(P﹤0.05或0.01),其中MI组在相应牵张幅度下其MAPD90增加更为显著(与正常对照组比较,P﹤0.01;如△V=0.3 ml,从63.2±4.95 ms到55.67±4.39 ms).链霉素对基础状态下MAPD90无影响(P﹥0.05),但可使牵张后已延长的MAPD90显著缩短(P均﹤0.05;如MI组与MI+链霉素组,△V=0.2 ml,从58.09±4.27 ms到53.1±3.64 ms).正常及MI组PVB和VT发生率随△V的增加而增加,且后者高于前者.链霉素使两组PVB发生率显著下降,并可显著抑制VT的发生(P﹤0.005).结论 MI后牵张更有助于恶性心律失常的产生和维持,链霉素可以明显抑制上述现象的发生.
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