AIM: To investigate the protective effect of pinacidil postconditioning on rat myocardium suffering ischemia / reperfusion injury by mitochondrial proteomics. METHODS: Langendorff apparatus was used to establish the model of myocardial ischemia / reperfusion injury. Sprague-Dawley rats were randomly divided into 2 groups: pinacidil postconditioning group( Pina group) and ischemia / reperfusion injury group( I / R group). After 20 min of perfusion with K-H solution,the perfusion was suspended for 40-min( glo...