Clapp, S Down's syndrome, complete atrioventricular canal, and pulmonary vascular obstructive disease. [electronic resource] - The Journal of thoracic and cardiovascular surgery Jul 1990 - 115-21 p. digital Publication Type: Journal Article ISSN: 0022-5223 Subjects--Topical Terms: AdolescentAdultBiopsyCardiac CatheterizationChildDown Syndrome--complicationsEndocardial Cushion Defects--complicationsHeart Septal Defects--complicationsHumansHypertension, Pulmonary--etiologyLung--pathologyPulmonary CirculationRetrospective StudiesVascular Resistance