title: [A study of vectorcardiographic QRS loop in infants with ventricular septal defect].
mesh_terms: D000367:Age Factors; D002648:Child; D002675:Child, Preschool; D006345:Heart Septal Defects, Ventricular / Q000503:physiopathology*; D006801:Humans; D007223:Infant; D014672:Vectorcardiography