title: Three directional ballistocardiogram in atrial septal defect.
mesh_terms: D000293:Adolescent; D000328:Adult; D001450:Ballistocardiography; D002648:Child; D005260:Female; D006344:Heart Septal Defects, Atrial / Q000503:physiopathology*; D006801:Humans; D008297:Male; D008875:Middle Aged