Two-year outcome after early or late Intervention in non-ST elevation acute coronary syndrome

To compare long-term outcome of an early to a delayed invasive strategy in high-risk patients with non-ST elevation acute coronary syndrome (NSTE-ACS).

This prospective, multicentre trial included patients with NSTE-ACS and at least two out of three of the following high-risk criteria: (1) evidence of extensive myocardial ischaemia on ECG, (2) elevated biomarkers for myocardial necrosis and (3) age above 65 years. Patients were randomised to either an early (angiography and revascularisation if appropriate <12 hours) or a delayed invasive strategy (>48 hours after randomisation). Endpoint for this prespecified long-term follow-up was the composite incidence of death or reinfarction after 2 years. Data collection was performed by telephone contact with the patients, their relatives or general practitioner and by review of hospital records.

Endpoint status after 2-year follow-up was collected in 521 of 542 initially enrolled patients. Incidence of death or reinfarction was 11.8% in the early and 13.1% in the delayed treatment group (relative risk (RR)=0.90, 95% CI 0.57 to 1.42). No significant differences were found in occurrence of the individual components of the primary endpoint: death 6.1% vs 8.9%, RR 0.69 (95% CI 0.37 to 1.27), reinfarction 6.5% vs 5.4%, RR 1.20 (95% CI 0.60 to 2.38). Post-hoc subgroup analysis showed statistical significant interaction between age and treatment strategy on outcome (p=0.02).

After 2 years follow-up, no difference in incidence of death or reinfarction was seen between early to late invasive strategy. These findings are in line with results of other studies with longer follow-up. Older patients seem to benefit more from early invasive treatment.