Obstetrics & gynaecology · UKMLA & AKT
Vasa praevia
A free high-yield preview for the UKMLA Applied Knowledge Test. Below are the key points to recognise vasa praevia — the full SA Note notes add investigations, management, complications and 10 practice questions.
Key high-yield points
- Foetal blood vessels run within fetal membranes across or within 2 cm of the internal cervical os, unprotected by placental tissue or Wharton's jelly. Rupture of membranes tears these vessels, causing purely foetal haemorrhage - lethal given a neonate's total blood volume of only ~250-300 mL.
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