Background: There are conflicting data on the clinical benefit from early administration of abciximab from a large randomized trial and a registry. However, both sources suggest that a benefit may depend on the baseline risk profile of the patients. We evaluated the role of early abciximab administration in patients with ST-segment-elevation myocardial infarction (STEMI) referred for primary percutaneous coronary intervention stratified by the STEMI Thrombolysis In Myocardial Infarction (TIMI) risk score.
Methods: A total of 1,650 patients were enrolled into the EUROTRANSFER Registry. One thousand eighty-six patients received abciximab (66%). Abciximab was administered early in 727 patients (EA) and late in 359 patients (LA). We used the TIMI risk score for risk stratification. Patients with scores >or=3 constituted the high-risk group of 616 patients (56.7%), whereas 470 patients formed the low-risk cohort. Factoring in the timing of the abciximab administration resulted in 4 groups of patients who were compared for mortality at 1 year: EA/high-risk (n = 413); LA/high-risk (n = 203); EA/low-risk (n = 314); LA/low-risk (n = 156). Baseline difference was accounted for by means of propensity score.
Results: In high-risk patients, 1-year mortality was significantly lower with early abcximab compared to late administration (8.7% vs 15.8%; odds ratio 0.51, CI 0.31-0.85, P = .01). In multivariable Cox regression analysis, both early abciximab administration and patients' risk profile (TIMI score >or=3) were identified as independent predictors of 1-year mortality.
Conclusions: Early abciximab administration before transfer for percutaneous coronary intervention in STEMI shows lower mortality at 1-year follow-up. This effect is confined to patients with higher risk profile as defined by TIMI risk score >or=3.