The Effect of Addition of Metformin In Obese Non- Diabetic Patients With Heart Failure With Preserved Ejection Fraction

The intervention will consist in giving metformin starting with 500 mg once daily (at breakfast) during the first week; if well tolerated, the dose was progressively increased to 500 mg twice daily (at breakfast and dinner) during week 2, to 1000 mg at breakfast and 500 mg at dinner during week 3, in order to reach the target dose of 1000 mg twice daily (at breakfast and dinner)