title: Paradoxic phenomenon of premature beats with narrow QRS in the presence of bundle-branch block.
mesh_terms: D000328:Adult; D000368:Aged; D000787:Angina Pectoris / Q000150:complications / Q000503:physiopathology; D002037:Bundle-Branch Block / Q000150:complications / Q000209:etiology / Q000503:physiopathology*; D003327:Coronary Disease / Q000150:complications / Q000503:physiopathology; D004562:Electrocardiography; D005260:Female; D006329:Heart Conduction System / Q000503:physiopathology; D006339:Heart Rate; D006352:Heart Ventricles / Q000503:physiopathology; D006801:Humans; D008297:Male; D008875:Middle Aged; D009203:Myocardial Infarction / Q000150:complications / Q000503:physiopathology; D013610:Tachycardia / Q000209:etiology / Q000503:physiopathology