2%) in ventricular pressure, left ventricular developed pressure (+16%), and rate pressure product (+24%), and significantly lower creatine kinase MB (-30%) and infarct size (-27%) than those of the sham group. Simultaneously, the diabetic and hypertensive rats had a

significantly higher rate of rise (+32%) and decrease (+30.2%) in ventricular pressure, left ventricular developed pressure (+17.2%), and rate pressure product (+22.2%), Inhibitors,research,lifescience,medical and significantly lower creatine kinase MB (-24%) and infarct size (-16.2%) than those of the diabetic group. Conclusion: The findings indicated that the simultaneity of hypertension with type 2 diabetes attenuated diabetes-induced cardiac impairment. Keywords: Renovascular hypertension, •Type 2 diabetes mellitus, Cardiac functions Introduction learn more experimental models

of hypertension and diabetes type 2 indicate that such diseases are associated Inhibitors,research,lifescience,medical with changes in cardiac functions. It has been shown that diabetes is associated with impaired as well as improved cardiac functions. Hearts isolated from experimental models of diabetes, induced Inhibitors,research,lifescience,medical by either Streptozotocin (STZ) or Alloxan, exhibited severe impaired functions manifested by higher infarct size and mortality following ischemia and reperfusion,1-2 lower coronary flow,3 higher coronary resistance,4 lower left ventricular developed pressure (LVDP),3 and lower cardiac power.5 On the other hand, experimental diabetes was associated with improved cardiac function, characterized by higher rate pressure product (RPP), LVDP, and lower release of creatine kinase MB (CK-MB) during reperfusion.6 Inhibitors,research,lifescience,medical There is no agreement on the cardiac effects of experimental hypertension. Spontaneous hypertension in rats does not change7 Inhibitors,research,lifescience,medical or increase8the indices of cardiac contractility. Furthermore, experimental hypertension is associated with higher infarct size and probability of arrhythmia following ischemia reperfusion,9 decreased recovery of LVDP,8 and higher coronary resistance.8 It is generally believed that hypertension enhances the cardiovascular effects of diabetes. Whether or not such

a generalization remains true at every stage of the diseases has not been examined. A few published studies have indicated that hearts form diabetic hypertensive animals may be less protected.8,10 Moreover, hypertension deteriorates the cardiovascular complications CYTH4 of diabetes, and the complications of simultaneous hypertension and diabetes were more severe than those of either hypertension or diabetes.8 There is; however, no experimental information on the effects of type 2 diabetes and renovascular hypertension on cardiac functions. Therefore, the present study was designed to examine the effects of experimental short-term renovascular hypertension on cardiac functions in type 2 diabetes in rats using the Langendorff technique.