title: [ON THE SIGNIFICANCE OF THE 1ST HEART BEAT IN THE DIAGNOSIS OF ATRIAL SEPTAL DEFECTS].
mesh_terms: D004562:Electrocardiography; D006343:Heart Septal Defects; D006344:Heart Septal Defects, Atrial; D006801:Humans; D010701:Phonocardiography
keywords: ELECTROCARDIOGRAPHY; HEART SEPTAL DEFECTS, ATRIAL; PHONOCARDIOGRAPHY
vernacular_title: ZUR BEDEUTUNG DES 1. HERZTONES FUER DIE DIAGNOSTIK DES VORHOFSEPTUMDEFEKTES.