Presents an abstract of the study 'Can Myocardial Infarction be Rapidly Identified in Emergency Department Patients Who Have Left Bundle-branch Block?,' by M. C. Contos, R. H. McQueen, R. L. Jesse, J. L. Tatum, J. P. Ornato, published in the May 2001 issue of the 'Annals of Emergency Medicine' journal. Comment on the study.