The myocardial infarction (MI) of the young subject is a singular entity.

The objective of our study was to analyze the epidemiological, clinical and progressive features of acute myocardial infarction in the young adult in the Monestir _ Tunisia Cardiology B department.

This is a study that included 1525patients (1433men and 92women) hospitalized for Acute Coronary Syndrome with ST segment elevation in the Fattouma Bourguiba Monastir Heart Hospital B ward from January 1998 to September 2015.

In our series, 1475 (94.4%) patients were older than 40 years old so 77.4% were men. Eighty-seven patients (5.6%) were under the age of 40, so 90.8% were men (P=0.003). Diabetes, arterial hypertension and antecedent coronary pathology are the predominant risk factors in the elderly group with p respectively equal to 0.003; <0.001 and 0.022. Active smoking was present in 85.1% of young people with IDM and 65.7% in older adults (P<0.001). The inaugural presentation is more frequent in the youth group (75.9% vs. 56.9%, P<0.05). MI was complicated of atrioventricular block in 9.9% of the elderly vs. 2.3% of the youth (P=0.019); of ventricular tachycardia (VT) in 3.7% of the elderly, while no youth presented a TV (P=0.05) and OAP in 37.3% in the elderly vs. 14% in the young (P=0.01). Mortality was 8.6% in the elderly group and 3.4% in the youth group.

Males and tobacco are the two leading risk factors in the group of young people presenting a MI. The clinical presentation is often inaugural. The complications are rare but serious with a risk of mortality that remains high.