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No data are so far available on the impact of age and obesity in ST-elevation myocardial infarction (STEMI) submitted to percutaneous coronary intervention (PCI).

We assessed the impact of age on the prognostic value of body mass index (BMI) in 1268 consecutive STEMI patients admitted to our Intensive Cardiac Care Unit (ICCU). BMI categories were as follows: 37 “lean” patients (37/1268, 2.9%), 403 “normal” patients (403/1268, 31.8%), 656 “overweight” patients (656/1268, 51.7%), 172 “obese” patients (172/1268, 13.6%). Among patients aged <75 years, as BMI increased, the number of males and diabetic patients significantly increased (p < 0.001 and p = 0.004, respectively). Among STEMI patients aged ≥75 years, lean patients showed a higher in-ICCU mortality in respect to the other BMI categories but this did not reach statistical significance. BMI was …