vasa previa
Pronunciation: /ˈveɪsə ˈpriːviə/
Condition where fetal blood vessels cross the cervical os, creating risk of fetal hemorrhage.
Full Definition
Vasa previa is a rare but serious obstetric condition where fetal blood vessels from the placenta or umbilical cord cross the internal cervical os, lying in the path of the presenting fetal part. This condition occurs in approximately 1 in 2,500 pregnancies and is associated with velamentous cord insertion or succenturiate placental lobes. The primary danger is fetal exsanguination if these vessels rupture during labor or with rupture of membranes. Diagnosis is typically made by color Doppler ultrasound, and management involves delivery by cesarean section before the onset of labor, usually around 35-37 weeks of gestation.
Usage
Usage note: Latin term, not italicized in medical writing; 'previa' means 'going before'.
In Context
- "Color Doppler ultrasound confirmed vasa previa with fetal vessels crossing the internal os." — Ultrasound report
- "The patient with vasa previa was scheduled for elective cesarean delivery at 36 weeks to prevent fetal hemorrhage." — Delivery planning note