To investigate the association of cardiac Risk factors and the risk of Acute myocardial infarction, in ED patients with non-diagnostic ECG. Methods:

474 patients were enrolled,150 had non diagnostic ECG In this study HTN with p-value = 0/012 (> 0/05), HIP with p-value = 0/0001 (> 0/001), FH with p-value = 0/001(> 0/01) was significantly more prevalent in those who ruled in for AMI.

In the past studies in patients with non-diagnostic ECG only hypertension Was significantly more prevalent in those who ruled in for AMI and cardiac risk factors have limited clinical value in diagnosing of AMI in ED patients. In this study HLP, HTN, FH was significantly more prevalent in those who ruled in for AMI An observational study is conducted in an educational hospital in Shahid Beheshti university during a period of two years. In this study, patients with symptoms suggestive of AMI including. chest pain, Dyspnea, palpitation, syncope, cerebrovascular accident, nausea, vomiting, vertigo, loss of consciousness were enrolled. Demographic, historical feature and risk factors, such as age, sex, diabetes, hypertension, hyper lipidemia, renal failure, positive family history of CAD, smoking, substance abuse, Alcohol use in the past 24 hours, cocaine use in the past 48 h were recorded. Nondiagnost ECG including these categories: Normal, non specific, early Repolarization, abnormal without signs of ischemia such as old bundle branch block, LVH, … A final diagnosis of Acute myocardial infarction was determined by CK - MB and Troponin - 1.