ABSTRACT
Objective: To investigate the effect of potassium channel opener nicorandil on myocardial ischemia-reperfusion injury (MIRI) in isolated rat's heart. Methods: Langendorff system was established for isolated heart reperfusion. A total of 44 rats were randomly divided into 4 groups: Normal control group, Ischemia-reperfusion (I-R) group, Adenosine/I-R (A/I-R) group, the I-R heart was treated by adenosine 100 μmo/L and Nicorandil/I-R (N/I-R) group, the I-R heart was treated by nicorandil 200 μmo/L.n=11 in each group. Left ventricular developed pressure (LVDP), the maximal rise/fall rate of left ventricular pressure (±dp/dtmax), reperfusion arrhythmia (RA) and myocardial infarction (MI) size were recorded; the expressions of left ventricular tissue acetaldehyde dehydrogenase 2 (ALDH2), Bcl-2 and Bax were examined and compared among different groups. Results:①Compared with I-R and A/I-R groups, N/I-R group had increased LVDP at 30 min and 45 min reperfusion, allP0.05. Conclusion: Nicorandil may reduce MIRI and protect myocardium in isolated rat's heart, the overall effect is better than adenosine. Nicorandil can up-regulate the expressions of mitochondrial ALDH2, Bcl-2 and down-regulate the expression of Bax.