PURPOSES: Reciprocal changes are frequent in patients with acute ST-segment elevation myocardial infarction (STEMI). However, their prognostic significance is not clear in patients undergoing immediate invasive intervention. BASIC PROCEDURE: We retrospectively examined 165 consecutive patients with STEMI receiving immediate invasive intervention. The first electrocardiography taken in the emergency department was analyzed. Patients were assigned to 2 groups: with a reciprocal change (group I, n = 100) and without a reciprocal change (group II, n = 65). MAIN FINDINGS: Electrocardiographs revealed that more anterolateral and inferior STEMI occurred in group I and more anterior STEMI occurred in group II. In the emergency department, group I had lower systolic and diastolic blood pressures, higher ventricular tachycardia and fibrillation rates, and higher cardiopulmonary resuscitation rates than did group II. Upon admission, peak troponin I levels were significantly higher in group I, and more group I patients required intra-aortic balloon pumping support. This unstable hemodynamic condition in group I patients was reflected by their higher in-hospital mortality rate. Multivariate analysis showed that age (odds ratio [OR], 1.103; 95% confidence interval [CI], 1.022-1.190; P = .012), Killip class (OR, 2.785; 95% CI, 1.049-7.400; P = .040), and reciprocal change (OR, 9.553; 95% CI, 1.146-79.608; P = .037) remained as independent predictors of in-hospital mortality. Actuarial freedom from all-cause mortality was worse in group I (P = .046). PRINCIPAL CONCLUSIONS: The data suggest that patients with STEMI with reciprocal electrocardiographic changes have unstable hemodynamic status and poorer outcomes. Further prospective studies using a larger patient population are needed. [ABSTRACT FROM AUTHOR]
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