placenta praevia
Pronunciation: plah-SEN-tah PRAY-vee-ah
Abnormal placental implantation where the placenta partially or completely covers the cervical opening.
Full Definition
Placenta praevia is a potentially serious obstetric condition where the placenta implants in the lower segment of the uterus, partially or completely covering the internal cervical os. This abnormal positioning can cause painless antepartum bleeding, typically in the third trimester. The condition is classified as major (covering the cervical os) or minor (edge reaches but doesn't cover the os). Placenta praevia increases the risk of severe haemorrhage during delivery and usually requires caesarean section. Risk factors include previous caesarean section, maternal age, and smoking.
Usage
Usage note: British spelling 'praevia' vs American 'previa' - maintain consistency.
In Context
- "Ultrasound confirmed placenta praevia at 32 weeks gestation." — Antenatal scan report
- "The patient with placenta praevia was advised pelvic rest and serial monitoring." — Obstetric management plan