RESUMO
<p><b>OBJECTIVE</b>To explore the effect of jianxin pinglu pill (JPP) on arrhythmia and aquaporin 4 (AQP4) in rats with myocardial ischemia/reperfusion (I/R) injury.</p><p><b>METHODS</b>The effects of JPP on arrhythmia, mortality and AQP4 on I/R injured rats model induced by blocking left coronary artery were observed using II lead of ECG, HE stain and AQP4 immunohistochemical stain.</p><p><b>RESULTS</b>JPP showed significant effect in lowering the arrhythmia occurrence and mortality, reducing myocardial ischemic edema and injury, strengthening AQP4 expression in myocardial tissue.</p><p><b>CONCLUSION</b>JPP has the effect of preventing I/R induced arrhythmia, it might be related with its action in up-regulating AQP4 expression level in myocardium and reducing the intracellular edema.</p>