title: A comparison of continuous wave Doppler ultrasonography with microsphere measured left-to-right shunt through the patent ductus arteriosus.
mesh_terms: D000818:Animals; D000831:Animals, Newborn; D002302:Cardiac Output; D004374:Ductus Arteriosus, Patent / Q000175:diagnosis* / Q000503:physiopathology; D005069:Evaluation Studies as Topic; D006439:Hemodynamics; D008863:Microspheres; D011868:Radioisotopes / Q000008:administration & dosage; D012756:Sheep; D013997:Time Factors; D014463:Ultrasonography
chemical_list: D011868:Radioisotopes