title: Etiology of prolongation of the P-R interval in patients with an endocardial cushion defect. Further observations on internodal conduction and the polarity of the retrograde P wave.
mesh_terms: D000293:Adolescent; D000328:Adult; D002648:Child; D002675:Child, Preschool; D004562:Electrocardiography; D004566:Electrodes; D005112:Extracorporeal Circulation; D005260:Female; D006325:Heart Atria / Q000503:physiopathology; D006329:Heart Conduction System / Q000503:physiopathology*; D006330:Heart Defects, Congenital / Q000503:physiopathology / Q000601:surgery; D006344:Heart Septal Defects, Atrial / Q000503:physiopathology* / Q000601:surgery; D006801:Humans; D008297:Male; D010138:Pacemaker, Artificial; D013997:Time Factors