Management of midtrimester oligohydramnios: a case for amnioinfusion.

Ultrasonic evaluation and diagnosis in cases of severe oligohydramnios is extremely difficult, and management problems exist. With appropriate diagnostic procedures, management becomes less of a dilemma. Amnioinfusion, which is the instillation of fluid into the amniotic cavity, enhances ultrasonic resolution necessary for observation of fetal anatomy and behavior. The cases of severe oligohydramnios reviewed typify those in which amnioinfusion was used to diagnose and manage mid-trimester pregnancies. This technique enabled the practitioner to define the specific cause of the oligohydramnios. Interventions, risks, and outcomes of the cases are discussed.