GROUP 1: Normoglycemic cases GROUP 2: Newly diagnosed hyperglycemic cases Group 2a: Unrecognized diabetes, hbA1c: >6.0% Group 2b: Stress hyperglycemia <6.0%. GROUP 3: Known diabetes Age, gender, co-morbidities on admission, adverse outcomes in hospital, duration of stay in coronary ICU, deaths, drugs, and glucose levels will be all recorded.