title: The vectorcardiographic study of the P loop in adults with ostium secundum atrial septal defect.
mesh_terms: D000293:Adolescent; D000328:Adult; D005260:Female; D006344:Heart Septal Defects, Atrial / Q000503:physiopathology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D014672:Vectorcardiography