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Intrahospital prognosis of acute myocardial infarction by means of discriminant analysis: methodological aspects and clinical results.

Discriminant analysis was carried out in 83 patients with acute myocardial infarction who underwent hemodynamic monitoring, to obtain a prognostic index. The classification rate was satisfactory in over 80% of the patients both in a subset used to construct the prognostic index and in a pilot group in which the validity of the index was assessed. In decreasing order of importance the parameters in the function were: age, history of angina, pulmonary artery end-diastolic pressure, diastolic systemic pressure, sum of ST segment elevation, pulmonary vascular resistance, heart rate, history of hypertension and site of necrosis. A much less satisfactory classification rate was obtained using two well-established indexes, perhaps because of sampling, methodological and chronological differences. It thus seems desirable for each hospital to use prognostic indexes obtained from its own population. Such indexes should be updated whenever necessary.