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[Long-term follow-up of patients with acute myocardial infarction treated with primary angioplasty or thrombolysis. Results of the MITRA trial].

Long-term follow-up after treatment with primary angioplasty compared to treatment with thrombolysis in patients with acute myocardial infarction (AMI) remains still to be determined. We therefore analyzed the data of the "Maximal Individual Therapy" in Acute Myocardial Infarction (MITRA-1) Registry. Follow-up data for a median of 17 months after discharge were available in 2090 out of 2195 (95%) AMI patients treated with thrombolysis, as well as 293 out of 312 patients (94%) treated with primary angioplasty. There were only small differences in patient characteristics between the two treatment groups. Compared to patients treated with thrombolysis, those treated with primary angioplasty had a higher prevalence of prior myocardial infarction (16.4% versus 12.2%, p = 0.04), longer prehospital delay: 10 minutes (130 minutes versus 120 minutes, p = 0.002), and a longer door-to-treatment time: 45 minutes (p < 0.001). Primary angioplasty patients were more likely to be treated with beta-blockers (primary angioplasty 79.8% versus thrombolysis 66.2%, p < 0.001) or statins (24.5% versus 16.5%, p < 0.001). There was no difference between the treatment groups for total mortality (p = 0.90) nor for the combined endpoint of death or re-infarction (p = 0.85). However, the combined endpoint of death, re-infarction or percutaneous coronary intervention or coronary bypass surgery was significantly lower in the primary angioplasty group (primary angioplasty 25.6% versus thrombolysis 32.3%, univariate odds ratio 0.72, 95% CI: 0.55-0.95, p = 0.02). This result was confirmed by multivariate analysis after adjusting for confounding parameters (multivariate odds ratio: 0.62, 95% CI: 0.42-0.91). The beneficial effect of primary angioplasty compared to thrombolysis achieved during the hospital stay after an AMI is maintained during a 17 month follow-up. AMI patients treated with thrombolysis were more likely to be treated with either percutaneous coronary intervention or coronary bypass surgery after discharge.