title: [Studies of the technics of diagnosis of congenital heart diseases by rightsided two-dimensional contrast echocardiography].
mesh_terms: D002245:Carbon Dioxide; D004452:Echocardiography / Q000379:methods*; D006330:Heart Defects, Congenital / Q000175:diagnosis*; D006801:Humans
chemical_list: D002245:Carbon Dioxide