Management of Myelomeningocele Study (MOMS)

Since 1997, more than 200 fetuses have had in utero closure of myelomeningocele by open maternal-fetal surgery. Preliminary clinical evidence suggests that this procedure reduces the incidence of shunt-dependent hydrocephalus and restores the cerebellum and brainstem to more normal configuration. However, clinical results of prenatal surgery for myelomeningocele are based on comparisons with historical controls and examine only efficacy, not safety. MOMS will determine if intrauterine repair of fetal myelomeningocele at 19 to 25 weeks of gestation improves outcomes as compared to standard postnatal repair. Outcomes assessed include death, the need for ventricular decompressive shunting by one year of life and neurologic function at 30 months of age.

One hundred eighty-three women, whose fetuses have spina bifida, were enrolled in the study and randomized to have either prenatal surgery or postnatal surgery. After a central screening process which included a medical record review, all women had an extensive baseline evaluation that included ultrasound, MRI, physical exam, social work evaluation, psychological screening, and education about spina bifida and prenatal surgery.

For women who were eligible following the central screening process, all screening, surgery and follow-up visits were performed at one of three MOMS Centers. The mother, if eligible, and her support person traveled (at the expense of the study) to the MOMS Center for screening and randomization.

Women assigned to have prenatal surgery were scheduled for surgery within 1 to 3 days after they were randomized. They stayed near the MOMS Center until they delivered. Women in the postnatal group traveled back to their assigned MOMS Center to deliver. Both groups delivered their babies by C-section around the 37th week of their pregnancies. Babies born to women in the postnatal surgery group had their spina bifida defects closed when they were medically stable, usually within 48 hours of birth.

Children and their parents returned to their assigned MOMS Center at 1 year and 2 ½ years of age for follow-up evaluation. Motor function, developmental progress, and bladder, kidney, and brain development were assessed.

The children were asked to return for an additional follow-up visit (MOMS2) between the ages of 6-10 years. This follow-up is to determine whether children who received the surgery before birth have better health and mental outcomes and live more independently and function more safely and appropriately in daily life than those who received the surgery after birth.

Inclusion criteria

• Pregnant women carrying a fetus diagnosed with myelomeningocele
• Myelomeningocele lesion that starts no higher than T1 and no lower than S1 with hindbrain herniation present
• Gestational age at randomization of 19 weeks 0 days to 25 weeks 6 days
• Normal karyotype
• Singleton pregnancy
• United States resident
• Able to travel to study site for study evaluation, procedures, and visits (if randomized to prenatal surgery, must stay near center until delivery)
• Support person to travel and stay with participant

Exclusion criteria

• Maternal insulin-dependent pregestational diabetes
• Short or incompetent cervix or cervical cerclage
• Placenta previa
• Body mass index of 35 or more
• Previous spontaneous delivery prior to 37 weeks
• Maternal HIV, Hepatitis-B or Hepatitis-C status positive
• Uterine anomaly
• Maternal medical condition which is a contraindication to surgery or general anesthesia
• Other fetal anomaly