Usefulness of high-frequency analysis of signal-averaged surface electrocardiograms in acute myocardial infarction before and after coronary thrombolysis for assessing coronary reperfusion - Tranchesi Junior, B; Verstraete, M; Werf, F V; Albuquerque, C P; Caramelli, B; Gebara, O C E; Pereira, W I; Moffa, Paulo Jorge; Bellotti, Giovanni; Pileggi, F (American Journal of Cardiology, 1990)