Metformin in Diabetic Patients Undergoing Coronary Angiography

Exclusion Criteria

• •Known coronary anatomy with planned complex percutaneous coronary intervention with high probability of large amount of contrast use (3.7 \* estimated glomerular filtration rate; e.g.: 167 ml in a patients with an eGFR of 45 ml/min/1.73m2).
• •Moderate to severe impairment of renal function (eGFR\<45 ml/min).
• •Moderate to severe impairment of liver function (Child-Pugh class B or C).
• •Severely impaired left ventricular ejection fraction (LVEF \<35%).
• •Patients undergoing primary percutaneous coronary intervention (i.e., patients presenting with ST elevation myocardial infarction).
• •Severe to very severe chronic obstructive pulmonary disease (GOLD class 3 to 4).
• •Patients scheduled for cardiac surgery in the following 5 days.
• •Inability to provide informed consent.