Acute ST-Elevation Myocardial Infarction in the Young Compared With Older Patients in the Tamil Nadu STEMI Program.

Objective: To compare the clinical presentation, risk factors and outcomes of young patients (≤45 years) presenting with ST segment-elevation myocardial infarction (STEMI) with older STEMI patients in the Tamil Nadu STEMI program (TN-STEMI).

Methods: A total of 2,420 patients were enrolled in the TN-STEMI program, which is a pre-implementation and post-implementation quality of care study. The cohort of patients was divided into young STEMI patients (≤45 years) and compared with those aged >45 years.

Results: A total of 591(24.4%) patients in this cohort were aged ≤45 years; 92.5% of the young STEMI were males. Smoking was the most common risk factor and its use was significantly more in younger myocardial infarction (MI) patients than in older patients (57% vs 31%; p<0.001). Compared with their older counterparts, younger patients had a lower prevalence of hypertension (14.2% vs 28.3%; p<0.001) and diabetes mellitus (13.2% vs 29.7%; p<0.001). Total ischaemic time was shorter for younger patients (235 vs 255 mins; p=0.03). Young STEMI patients more frequently presented with single vessel disease and the left anterior descending coronary artery was the most common infarct-related artery; they also had a higher thrombus load. Young MI patients had reduced mortality, both in-hospital (3.4% vs 6.4%; p=0.005) and at one year (7.6% vs 17.6%; p<0.001). Younger male STEMI patients also showed lower mortality than younger female patients.

Conclusions: Young STEMI patients compared with older STEMI patients had lower prevalence of traditional risk factors, shorter ischaemic time and reduced mortality. Young female STEMI patients had higher mortality than young male STEMI patients.