title: Propranolol induced electrical and mechanical alternans in orthodromic reciprocating tachycardia.
abstract: During an electrophysiological study in a patient with a concealed accessory connection, there was no evidence of electrical or mechanical alternans during tachycardia until propranolol was administered, but both forms of alternans developed with tachycardia of a slower rate following propranolol. Echocardiographic, arterial pressure, and electrocardiographic data obtained prior to and following propranolol administration are presented.
authors.affiliation: Department of Pediatrics, University of Minnesota Hospital and Clinics, Minneapolis 55455.
authors.forename: J E
authors.initials: JE
authors.lastname: Crosson
authors.forename: A
authors.initials: A
authors.lastname: Dunnigan
mesh_terms: D000293:Adolescent; D002304:Cardiac Pacing, Artificial; D015150:Echocardiography, Doppler; D004562:Electrocardiography; D006329:Heart Conduction System / Q000187:drug effects* / Q000503:physiopathology; D006801:Humans; D008297:Male; D011433:Propranolol / Q000494:pharmacology* / Q000627:therapeutic use; D011674:Pulse / Q000187:drug effects* / Q000502:physiology; D013610:Tachycardia / Q000175:diagnosis / Q000188:drug therapy / Q000503:physiopathology*
chemical_list: D011433:Propranolol