polyhydramnios
Pronunciation: pol-ee-hy-DRAM-nee-os
Excessive accumulation of amniotic fluid, often associated with fetal anomalies or maternal conditions.
Full Definition
Polyhydramnios is defined as an abnormally large volume of amniotic fluid, typically diagnosed when the amniotic fluid index exceeds 25 cm or the deepest vertical pocket measures more than 8 cm. In fetal surgery contexts, polyhydramnios commonly occurs in twin-to-twin transfusion syndrome (affecting the recipient twin), congenital anomalies affecting fetal swallowing, and certain genetic conditions. Severe polyhydramnios can cause maternal discomfort, preterm labor, and may complicate fetal surgical procedures due to excessive uterine distension.
Usage
Usage note: Include specific measurements (AFI or MVP) when documenting the diagnosis.
In Context
- "Severe polyhydramnios in the recipient twin prompted urgent laser therapy for twin-to-twin transfusion syndrome." — Clinical assessment
- "The polyhydramnios resolved following successful fetal tracheal occlusion for congenital diaphragmatic hernia." — Follow-up report