The prognostic value of a new left bundle branch block in patients with acute myocardial infarction: A systematic review and meta-analysis.

Objective: To assess the prognostic value of new left bundle branch block (LBBB) in patients with acute myocardial infarction (AMI).

Background: LBBB develops in many cardiac conditions, including AMI. The empirical evidence for the contribution of LBBB to mortality in AMI is not consistent.