N-acetylcysteine and Allopurinol Confer Synergy in Attenuating Myocardial Ischemia Injury via Restoring Hif-1a/ho-1 Signaling in Diabetic Rats Conclusion: Nac and Alp Confer Synergistic Cardioprotection in Diabetes via Restoration of Cardiac Hif-1a and Ho-1 Signaling