title: Prolonged P-R interval in a male with 47,XYY karyotype.
abstract: A 47,XYY male with an extremely prolonged P-R interval (0.42 sec) on the electrocardiograph is described. There was also a secondary R wave in lead V1. He had no past history of heart disease and no cardiac abnormality on physical examination.
mesh_terms: D000293:Adolescent; D004562:Electrocardiography; D006321:Heart / Q000503:physiopathology*; D006801:Humans; D008297:Male; D012729:Sex Chromosome Aberrations / Q000503:physiopathology*; D013997:Time Factors; D014997:XYY Karyotype / Q000503:physiopathology*