title: Significance of QRS alternans during narrow QRS tachycardias.
authors.affiliation: Department of Internal Medicine, University of Michigan Medical Center, Ann Arbor 48109-0022.
authors.forename: F
authors.initials: F
authors.lastname: Morady
mesh_terms: D004562:Electrocardiography; D006801:Humans; D013614:Tachycardia, Paroxysmal / Q000503:physiopathology*; D013617:Tachycardia, Supraventricular / Q000503:physiopathology*