title: Electrocardiographic signs of infarction masked by coexistent contralateral hemiblock.
mesh_terms: D000328:Adult; D004562:Electrocardiography; D006327:Heart Block / Q000150:complications*; D006329:Heart Conduction System; D006352:Heart Ventricles; D006801:Humans; D008875:Middle Aged; D009203:Myocardial Infarction / Q000150:complications* / Q000175:diagnosis; D013997:Time Factors; D014672:Vectorcardiography