title: Use of two-dimensional echocardiography and two-dimensional contrast echocardiography in diagnosis of patent ductus arteriosus.
mesh_terms: D000293:Adolescent; D002245:Carbon Dioxide; D002648:Child; D002675:Child, Preschool; D004374:Ductus Arteriosus, Patent / Q000175:diagnosis*; D004452:Echocardiography / Q000379:methods*; D006439:Hemodynamics; D006801:Humans
chemical_list: D002245:Carbon Dioxide