The in-hospital development of cardiogenic shock after myocardial infarction: incidence, predictors of occurrence, outcome and prognostic factors. The MILIS Study Group

Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts 02115.

The incidence, outcome and predictors of the in-hospital development of cardiogenic shock and its prognostic significance were analyzed in 845 patients presenting with acute myocardial infarction. Cardiogenic shock developed after hospitalization in 60 patients (7.1%). In half of these patients, cardiogenic shock developed at least 24 h after hospital admission. The in-hospital mortality rate was greater than 15 times higher for patients with cardiogenic shock than for patients without shock (65.0% versus 4.3%, respectively, p less than 0.001). Enzymatic evidence of infarct extension occurred in 23.3% of the patients with shock compared with 7.4% of those without shock (p less than 0.0001). Multivariate analysis indicated that independent predictors for the in-hospital development of cardiogenic shock were age greater than 65 years (p = 0.007), left ventricular ejection fraction on hospital admission less than 35% (p = 0.007), large infarct as estimated from serial enzyme determinations (that is, peak creatine kinase-MB isoenzyme greater than 160 IU/liter (p = 0.008), history of diabetes mellitus (p = 0.011) and previous myocardial infarction (p = 0.012). Patients with three, four or five of these risk factors had a 17.9%, 33.7% or 54.4% probability, respectively, of developing cardiogenic shock after hospital admission. Left ventricular function, as reflected by left ventricular ejection fraction (p = 0.04) and severity of left ventricular wall motion abnormality (p = 0.04), was the most important determinant of in-hospital mortality in the patients with cardiogenic shock.

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