Keywords: عروق کرونر; Diabetic cardiomyopathy; Cardiac failure; Diastolic dysfunction; Coronary arteries; Coronary vasoconstriction; Left-ventricular dysfunctionCuI, univalent Cu; CuII, divalent Cu; Cu2+ (aq), aqueous Cu2+ ion; CI, confidence interval; DCM, diabetic cardiomyop