Department of Obstetrics and Gynecology, University of Minnesota, Minneapolis.
Am J Perinatol. 2011 Jun;28(6):431-4. doi: 10.1055/s-0030-1268716. Epub 2010 Nov 16.
The etiology of polyhydramnios may be attributed to either increased production of amniotic fluid (fetal polyuria or high-output cardiac failure) or decreased fetal swallowing (obstruction or neurological impairment). Although idiopathic polyhydramnios occurs in nearly half of all cases, it is often associated with fetal abnormalities. Fetal ductus arteriosus flow is normally from right to left. We report a case of antenatally detected bidirectional fetal ductus arteriosus flow diagnosed concomitantly with polyhydramnios. Amnioreduction was performed due to severe maternal symptoms, which resulted in correction of the fetal ductus arteriosus flow. Postnatal diagnosis of a Morgagni diaphragmatic hernia indicates that our sonographic findings collectively may have been a diagnostic clue.
羊水过多的病因可能归因于羊水产生增加（胎儿多尿或心输出量过高性心力衰竭）或胎儿吞咽减少（梗阻或神经功能障碍）。虽然特发性羊水过多发生在近一半的病例中，但它常与胎儿异常相关。胎儿动脉导管血流通常是从右向左。我们报告了一例产前发现的双向胎儿动脉导管血流，同时伴有羊水过多。由于严重的母体症状，进行了羊水减量，这导致胎儿动脉导管血流得到纠正。产后诊断为 Morgagni 膈疝表明，我们的超声检查结果可能共同提供了一个诊断线索。
