title: THE EFFECT OF THE VALSALVA MANEUVER ON THE SPLITTING OF THE SECOND SOUND.
mesh_terms: D035843:Biomedical Research; D006325:Heart Atria; D006343:Heart Septal Defects; D006344:Heart Septal Defects, Atrial; D006801:Humans; D010701:Phonocardiography; D014636:Valsalva Maneuver
keywords: CLINICAL RESEARCH; HEART SEPTAL DEFECTS, ATRIAL; PHONOCARDIOGRAPHY; VALSALVA'S MANEUVER