Reperfusion therapy for acute ST-elevation and non ST-elevation myocardial infarction: what can be achieved in daily clinical practice in unselected patients at an interventional center?

Background: In the year 2000 a new definition of acute myocardial infarction (AMI) was introduced, now differentiating ST segment elevation AMI (STEMI) from non-ST segment elevation AMI (NSTEMI). The characterization of AMI patients according to this definition is still incomplete.

Methods And Results: 888 consecutive AMI patients at a single interventional center were included: 493 (55.5%) STEMI and 395 (44.5%) NSTEMI patients. Median age of STEMI patients was four years lower compared to NSTEMI patients (62.8 versus 66.6 years, P<0.001). STEMI patients more often presented in cardiogenic shock (11.0% versus 2.0%, P<0.001) and after pre-hospital resuscitation (4.9% versus 0.8%, P<0.001). Catheterization was performed in 98.4% of STEMI and in 95.9% of NSTEMI patients (P<0.001). The circumflex artery was more often the culprit lesion in NSTEMI patients compared to STEMI patients (58.3% versus 48%, P=0.003). They also showed significantly more often a 3 vessel disease (41.4% versus 29.9%, P=0.002). Out of STEMI patients 10.1% were treated with medical therapy only compared to 27.2% of NSTEMI patients (P<0.001). Whereas PCI was performed more often in STEMI patients (84.3% versus 57.8%, P<0.001), CABG was used more often in NSTEMI patients (21.6% versus 9.1%, P<0.001). In-hospital death was 8.7% in STEMI compared to 4.8% in NSTEMI patients (P<0.001).

Conclusions: In clinical practice STEMI and NSTEMI seem to occur with similar frequency. Invasive strategies were applied in a high percentage in both groups, however with different therapeutic consequences. In-hospital mortality was twice as high in STEMI compared to NSTEMI patients.