Medicines for Placenta praevia

What it is

Placenta praevia is a condition in pregnancy where the placenta (which nourishes the baby) is positioned low in the womb, so that it partly or completely covers, or lies very close to, the cervix (the opening of the womb). This matters because the cervix is where the baby would normally pass through during birth, so a placenta covering it can cause problems — particularly bleeding, which can be heavy, and can make a normal vaginal birth unsafe. A low-lying placenta is often first noticed at the routine mid-pregnancy ultrasound scan. Importantly, in many cases the placenta effectively "moves" up and away from the cervix as the womb grows during the pregnancy, so a low-lying placenta found early often resolves by later in the pregnancy and causes no problem. Where it persists (true placenta praevia), the main concern is bleeding from the vagina, which is typically painless and can occur in the later part of pregnancy, and can sometimes be sudden and heavy, needing urgent care. Because of the risk of bleeding and the implications for delivery, placenta praevia is monitored and a delivery plan is made, and it is well managed with appropriate obstetric care.

How it is treated

Placenta praevia is managed by the maternity team with monitoring and planning, tailored to whether it persists and to any bleeding. When a low-lying placenta is found at the mid-pregnancy scan, a follow-up scan later in pregnancy checks whether it has moved up and away from the cervix (as it often does) or persists. Where placenta praevia persists, the pregnancy is monitored more closely, and a plan is made for a safe delivery — which, if the placenta is covering or too close to the cervix, is usually a planned caesarean section, since a vaginal birth would risk severe bleeding. Women are advised about the risk of bleeding and when to seek urgent help, and some may be advised to avoid things that could provoke bleeding (such as penetrative sex) and to stay within reach of the hospital later in pregnancy. Any episode of vaginal bleeding needs prompt assessment, and significant bleeding is an emergency needing urgent care, sometimes leading to earlier delivery. Blood tests and, sometimes, treatments to support the pregnancy are arranged as needed. The reassuring message is that a low-lying placenta found early often resolves on its own, and that persistent placenta praevia is well managed with monitoring and a planned delivery (usually caesarean) — so any bleeding in pregnancy should be reported promptly.