title: The silent ductus arteriosus.
abstract: Preterm infants at risk of developing a patent ductus arteriosus were followed sequentially by physical examination, echocardiographic determinations of the LA/AO ratio, and chest roentgenograms. The results show that a significant number of infants who have no clinical signs or symptoms of a PDA have large left-to-right shunts. The presence of this shunt was suggested by acute increase in left atrial size by ECHO determination and confirmed by retrograde single-film aortography. Clinical signs and symptoms often developed several days after documentation of the left-to-right shunt.
mesh_terms: D001027:Aortography; D004374:Ductus Arteriosus, Patent / Q000150:complications / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000628:therapy; D004452:Echocardiography; D006325:Heart Atria / Q000000981:diagnostic imaging; D006801:Humans; D007231:Infant, Newborn; D012127:Respiratory Distress Syndrome, Newborn / Q000150:complications