vasa praevia Flashcards
what
fetal vessels are within chorioamniotic membranes and travel across internal cervical os
fetal vessels
2 umbilical arteries
umbilical vein
normal circumstances
umbilical cord contains fetal vessels and inserts directly into placenta
fetal vessels are always protected, either by umbilical cord or placenta
vasa praevia pathophysiology
fetal vessels exposed w/o protection of umbilical cord or placenta
they travel through chorioamniotic membranes and cross the internal cervical os
T1 vasa praevia
vessels exposed as a velamentous umbilical rod
- umbilical cord inserts into the chorioamniotic membranes, and the fetal vessels travel unprotected through the membranes before joining the placenta
T2 vasa praevia
fetal vessels are exposed as they travel to an accessory placental lobe
risk factors
low lying placenta
IVF pregnancy
multiple pregnancy
presentation
picked up on USS
APH
vaginal exam during labour - pulsating fetal vessels seen
during labour with fetal distress and dark-red bleeding
Mx - asymptomatic
steroids given from 32wks
elective CS 34-36wks
Mx - APH
emergency CS