title: Incidence and prognostic significance of right bundle branch block complicating acute myocardial infarction.
abstract: The incidence and hospital courseofacute myocardial infarction wereobserved among randomly selected 560 patients. The mean age of the patients was 53 +/- 6.67 years with male-female ratio 2.6:1. The incidence of right bundle branch block (RBBB) was 15% (84 out of 560 patients). New RBBB, old RBBB and RBBB of indeterminate age were observed in 33 (39.25%), 23 (27.40%) and 28 (33.25%) cases respectively. RBBB was isolated in 50 (60%) cases and bi-fascicular in remaining 34 (40%) cases. The rate of use of thrombolytic was greater in RBBB group than non-RBBB group (52% vs 30.67%, P < 0.05). The complications were more frequently observed in patients with RBBB: in-hospital mortality, 27.40% vs 10.90% (P < 0.01); use of temporary pacemaker, 15% vs 9% (P < 0.05); and heart failure, 50% vs 35% (P < 0.05). In sub-group analysis, in-hospital mortality rate was higher among bi-fascicular group than isolated RBBB group (P < 0.05). Thus it appeared from the results that the incidence of RBBB is relatively common i.e. 15% over all (84 out of 560) and 5.90% new (33 out of 560) and despite greater use of thrombolytics, some specific in-hospital complications were significantly higher in patients with RBBB than without, RBBB.
authors.affiliation: Dept of Cardiology, NICVD, Dhaka.
authors.forename: M N
authors.initials: MN
authors.lastname: Islam
authors.forename: M A
authors.initials: MA
authors.lastname: Ali
authors.forename: G K
authors.initials: GK
authors.lastname: Saha
authors.forename: M F
authors.initials: MF
authors.lastname: Islam
authors.forename: K Q
authors.initials: KQ
authors.lastname: Islam
authors.forename: M S
authors.initials: MS
authors.lastname: Rahman
mesh_terms: D000328:Adult; D000368:Aged; D002037:Bundle-Branch Block / Q000150:complications*; D005260:Female; D017052:Hospital Mortality; D006801:Humans; D008297:Male; D008875:Middle Aged; D009203:Myocardial Infarction / Q000150:complications* / Q000188:drug therapy / Q000401:mortality; D011379:Prognosis; D011446:Prospective Studies; D015912:Thrombolytic Therapy