title: Prognostic significance of right bundle branch block in patients with acute inferior myocardial infarction.
abstract: There is little information available concerning the influence of right bundle branch block (RBBB) on the prognosis of patients with inferior myocardial infarction (MI). In this study we evaluated the influence of RBBB on the short-term prognosis of patients with inferior MI. Our study subjects were 1,265 hospitalized patients with Q wave MI. Patients were divided into 4 groups based on the presence or absence of RBBB and on the location of the infarction. RBBB was classified into 4 categories according to the timing of its appearance and its duration as new permanent, transient, old and age indeterminate. In-hospital death and pulmonary congestion were observed more frequently in patients with RBBB than in those without RBBB. Moreover, in inferior MI as in anterior MI, in-hospital death and pulmonary congestion occurred more frequently in new permanent RBBB patients than in patients with other types of RBBB. Multivariate regression analysis reveals that new permanent RBBB was a strong independent predictor for an adverse short-term prognosis in patients with inferior MI, as well as in patients with anterior MI. New permanent RBBB during inferior MI is a strong independent predictor for increased in-hospital mortality, regardless of the infarction location.
authors.affiliation: Department of Cardiology, Iwakuni Clinical Center, National Hospital Organization, Iwakuni, Yamaguchi 740-8510, Japan. jun1839@hotmail.com
authors.forename: Jun
authors.initials: J
authors.lastname: Iwasaki
authors.forename: Kunihisa
authors.initials: K
authors.lastname: Kono
authors.forename: Yusuke
authors.initials: Y
authors.lastname: Katayama
authors.forename: Natsuki
authors.initials: N
authors.lastname: Takahashi
authors.forename: Kazufumi
authors.initials: K
authors.lastname: Takeuchi
authors.forename: Machiko
authors.initials: M
authors.lastname: Tanakaya
authors.forename: Kazuhiro
authors.initials: K
authors.lastname: Osawa
authors.forename: Teruo
authors.initials: T
authors.lastname: Shiraki
authors.forename: Daiji
authors.initials: D
authors.lastname: Saito
mesh_terms: D000328:Adult; D000368:Aged; D002037:Bundle-Branch Block / Q000401:mortality*; D004562:Electrocardiography; D005260:Female; D017052:Hospital Mortality; D006801:Humans; D008297:Male; D008875:Middle Aged; D015999:Multivariate Analysis; D009203:Myocardial Infarction / Q000150:complications / Q000401:mortality*; D011379:Prognosis