title: The R-on-T phenomenon during supraventricular tachycardia in childhood.
abstract: The electrocardiographic R-on-T phenomenon was observed in the absence of Wolff-Parkinson-White syndrome during recurrent episodes of supraventricular tachycardia (SVT) with rates between 240 to 275 per minute in a 5 year old boy. The rapid ventricular response during SVT corroborates the recent finding of a short refractory period of the A-V node in children. The demonstration of the R-on-T phenomenon in this child may be important in attempting to understand the pathogenesis of sudden death in children.
mesh_terms: D000367:Age Factors; D001145:Arrhythmias, Cardiac / Q000401:mortality; D001283:Atrioventricular Node / Q000503:physiopathology*; D006328:Cardiac Catheterization; D002675:Child, Preschool; D002932:Cineangiography; D004452:Echocardiography; D004562:Electrocardiography / Q000379:methods; D006329:Heart Conduction System / Q000503:physiopathology*; D006801:Humans; D008297:Male; D011433:Propranolol / Q000627:therapeutic use; D013398:Sudden Infant Death; D013614:Tachycardia, Paroxysmal / Q000188:drug therapy / Q000503:physiopathology*
chemical_list: D011433:Propranolol