Management of Uterine Fibroids During Pregnancy
Pregnancies with uterine fibroids should be managed expectantly with observation alone, as most are uncomplicated and prophylactic myomectomy is not recommended. 1, 2
Expectant Management is Standard
The majority of pregnant women with fibroids (70-90%) will have uncomplicated pregnancies and require no intervention beyond routine prenatal care. 1 The key principle is that concern about possible complications related to fibroids in pregnancy is not an indication for myomectomy except in women who have had a previous pregnancy with complications specifically related to these fibroids. 2
Risk Stratification
Complications occur in 10-30% of pregnant women with fibroids, with higher risk in specific scenarios: 1
- Multiple fibroids increase complication risk 1
- Fibroids larger than 5 cm are more problematic 1
- Lower uterine segment location poses greater risk 1
Women meeting these criteria may require additional maternal and fetal surveillance throughout pregnancy. 2
Potential Obstetric Complications
Be aware of increased risks for: 1
- Preterm birth (OR 1.5)
- Malpresentation (OR 2.65)
- Placental abruption (OR 2.63)
- Placenta previa (OR 2.21)
- Cesarean delivery (OR 2.60)
- Postpartum hemorrhage (OR 2.95)
Management of Red Degeneration
The most common pregnancy-specific complication is red degeneration, occurring in approximately 8% of pregnant women with fibroids. 1, 3 This presents as acute pelvic pain and should be managed conservatively with analgesics and supportive care. 3
Delivery Considerations
Most women with uterine fibroids can deliver vaginally without complications. 1 Cesarean delivery should be performed only for standard obstetric indications, not solely due to fibroid presence. 1
Cesarean myomectomy should be avoided when possible due to increased risk of hemorrhage and other complications. 1 This recommendation is firm despite the temptation to address fibroids opportunistically during cesarean delivery.
Postpartum Course
Fibroids can regress with postpartum involution, and even large fibroids may completely resolve after delivery. 4 This natural regression supports the conservative approach during pregnancy and reinforces that conception and delivery are reasonable options that may allow definitive treatment to be deferred. 4
Key Clinical Pitfall
The major pitfall is performing unnecessary myomectomy during pregnancy or at cesarean delivery. The evidence clearly shows that prophylactic intervention causes more harm than benefit, with case reports documenting uterine rupture in subsequent pregnancies after myomectomy. 5 Reserve surgical intervention for the rare patient with documented fibroid-related complications in a prior pregnancy. 2