The overall meaning of RBBB in acute myocardial infarction has not changed in the thrombolytic era, although a higher rate of new and transient RBBB and a lower rate of bifascicular block may represent a beneficial effect of thrombolytic therapy.
Background:The presence of bundle-branch block (BBB) is associated with high mortality rates and is considered an important predictor of poor outcome in patients with acute myocardial infarction (AMI).Hypothesis: The objective of this study was to assess the prognostic significance of BBB in patients with AM1 depending on its form of presentation.Methods: A multicenter prospective 1 -year follow-up study involving 1,239 consecutive patients diagnosed with AM1 was performed.Results: Bundle-branch block was present in 177 cases (\4.2%), associated with worse clinical characteristics, lower rate of thrombolytic therapy, and higher mortality: in-hospital (23.8 vs. 9.7%,p
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