title: [Intraventricular conduction disorders in acute myocardial infarction: early and late clinical significance].
abstract: The prognostic impact of new bundle branch block (BBB) upon the intra hospital course and long-term prognosis of patients with acute myocardial infarction (MI) was studied in 517 consecutive patients with a recent MI: 449 patients did not have BBB (group I) and 69 developed a new BBB (group II). Age and sex were similar in both groups. Incidence of BBB among patients with anterior wall MI was 61% compared to 8% in patients with inferior wall MI (p less than 0.05). The distribution of RBBB, RBBB + left anterior hemiblock and LBBB was 32%, 30% and 38% among 46 patients with anterior wall MI, compared to 28%, 6% and 68% among 18 patients with inferior wall MI (p less than 0.05). The level of peak CK values (2345 vs 1437 IU/l), presence of Killip grade III or IV (56 vs 18%), complete A-V block (24 vs 6%) and mortality (34 vs 9%) were significantly higher in group II (p less than 0.05). Long-term mortality at 1 and 5 years of follow up was 29% and 51% in group II patients, a three fold increase over group I. We conclude that development of new BBB during myocardial infarction is associated with a poor immediate and long term prognosis. This may be related to larger infarcts rather than the conduction defect itself.
authors.forename: M
authors.initials: M
authors.lastname: Hassi
authors.forename: S
authors.initials: S
authors.lastname: Kunstmann
authors.forename: R
authors.initials: R
authors.lastname: Corbalán
authors.forename: D
authors.initials: D
authors.lastname: Arriagada
authors.forename: P
authors.initials: P
authors.lastname: Casanegra
mesh_terms: D002037:Bundle-Branch Block / Q000175:diagnosis / Q000209:etiology*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D009203:Myocardial Infarction / Q000150:complications* / Q000175:diagnosis; D011379:Prognosis; D012189:Retrospective Studies; D012307:Risk Factors
vernacular_title: Trastornos de conducción intraventricular en infarto agudo del miocardio: significado clínico precoz y tardío.