title: A longitudinal study on electrophysiological properties of atrioventricular accessory pathways in infants and children.
abstract: In this study the electrophysiological developmental changes of accessory pathway (AP) properties in infants and children are examined. Intracardiac and/or transesophageal electrophysiological studies were performed on seven infants (group 1, mean age 2 months) and four children (group 2, mean age 9 y; study 1), and documented orthodromic atrioventricular tachycardia in all cases. At follow-up study (study 2), supraventricular tachycardia was induced in three of seven (43%) cases in group 1 and in all four cases in group 2. Changes in antegrade conduction properties of AP were documented by loss of pre-excitation (two of four cases in group 1) or change to intermittent pre-excitation (one of two cases in group 2).
authors.affiliation: Department of Pediatrics, Nihon University School of Medicine, Tokyo, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Ding
authors.forename: N
authors.initials: N
authors.lastname: Sumitomo
authors.forename: H
authors.initials: H
authors.lastname: Ushinohama
authors.forename: T
authors.initials: T
authors.lastname: Yamashita
authors.forename: K
authors.initials: K
authors.lastname: Harada
mesh_terms: D017668:Age of Onset; D002648:Child; D002675:Child, Preschool; D004562:Electrocardiography; D005260:Female; D005500:Follow-Up Studies; D006329:Heart Conduction System / Q000254:growth & development*; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008137:Longitudinal Studies; D008297:Male; D012008:Recurrence; D013611:Tachycardia, Atrioventricular Nodal Reentry / Q000503:physiopathology*