Prognostic significance of chronic versus acute bundle branch block in acute myocardial infarction

D. Gann, P. K. Balachandran, N. E. Sherif, P. Samet

Research output: Contribution to journalArticlepeer-review

36 Scopus citations


Of 1125 patients with acute myocardial infarction admitted to hospital in 1971 and 1972, 292 (28.8%) had intraventricular conduction defects. In 210 of the 292 patients with intraventricular conduction defect, it was possible to determine whether the conduction defect was present before the infarction (group 1, 123 patients), or developed acutely with the infarction (group 2, 87 patients). Of the 210 patients, 52.8% died (mean age 72.1 yr). 53 Patients in group 1 and 18 patients in group 2 had isolated left axis deviation. The mortality rates were 35% and 28%, respectively. This difference was not significant (p > 0.60). 64 of the 210 patients presented with a left bundle branch block pattern. The overall mortality of 54% was the same in both groups. Right bundle branch block (RBBB), with either normal axis, left or right axis deviation, was found in 74 patients. Of 40 patients in group 1, 62% died, and of 35 patients in group 2, 80% expired. Again this difference was not significant (p > 0.10). In 13 of 25 patients with RBBB in group 1, death was possibly related to progression of the conduction defect. The use of prophylactic temporary pacing is suggested for these patients.

Original languageEnglish (US)
Pages (from-to)298-303
Number of pages6
Issue number3
StatePublished - Jan 1 1975

ASJC Scopus subject areas

  • Pulmonary and Respiratory Medicine
  • Critical Care and Intensive Care Medicine
  • Cardiology and Cardiovascular Medicine


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