Intrauterine Fetal Therapy

Intrauterine Fetal Therapy - Womb Wonders

• Goal: Treat fetal conditions in utero to improve perinatal/long-term outcome.
• Core Concept: Intervention on fetus, placenta, umbilical cord, or amniotic fluid.
• General Indications:
  • Life-threatening condition with poor prognosis if untreated.
  • No effective postnatal therapy or postnatal therapy too late.
  • Accurate prenatal diagnosis.
  • Singleton pregnancy (usually).
  • Normal karyotype (often preferred).
• Prerequisites:
  • Multidisciplinary team (MFM, neonatology, pediatric surgery, anesthesia).
  • Informed parental consent.
  • Favorable risk-benefit ratio for mother and fetus.

⭐ Twin-to-Twin Transfusion Syndrome (TTTS): Fetoscopic laser photocoagulation of placental anastomoses is the gold standard treatment for severe TTTS diagnosed before 26 weeks gestation (Quintero stages II-IV).

Intrauterine Fetal Therapy - Pill Power for Preemies

• Antenatal Corticosteroids (ACS):
  • For preterm birth risk (24-34 wks).
  • Betamethasone (12mg IM x2, 24h apart) or Dexamethasone (6mg IM x4, 12h apart).
  • Reduces RDS, IVH, NEC. 📌 "Beta Lungs Better". ⭐ > ACS are most effective if given 24-48h before delivery; benefits last 7 days.
• Magnesium Sulfate ($MgSO_4$):
  • Neuroprotection if birth < 32 wks.
  • 4g IV load, then 1-2g/hr.
  • ↓ Cerebral Palsy risk.
• Congenital Adrenal Hyperplasia (CAH):
  • Dexamethasone to mother (pre-9 wks) to prevent XX virilization.
• Fetal Tachyarrhythmias (SVT):
  • Transplacental: Digoxin, Flecainide, Sotalol.
• Fetal Alloimmune Thrombocytopenia (NAIT):
  • Maternal IVIG, corticosteroids_._

Intrauterine Fetal Therapy - Tiny Scalpels, Big Hopes

Corrects fetal anomalies in utero, improving survival/reducing morbidity. Requires multidisciplinary team.

Types & Key Indications:

• Medical: Arrhythmias (Digoxin), thyroid dysfunction.
• Percutaneous (Needle-based):
  • Intrauterine Transfusion (IUT): Fetal anemia (Rh alloimmunization).
  • Shunts: LUTO (vesicoamniotic), hydrothorax (thoracoamniotic).
• Fetoscopic (Endoscopic):
  • TTTS: Laser photocoagulation of anastomoses (Quintero Stages II-IV, <26 wks).
  • CDH: FETO (Fetoscopic Endotracheal Occlusion) at 27-29 wks, removal at 34 wks.
  • Spina Bifida: Fetoscopic repair.
• Open Fetal Surgery:
  • Myelomeningocele (Spina Bifida): Repair 19-26 wks (MOMS trial).
  • Sacrococcygeal Teratoma (SCT): Resection for large tumors.
  • EXIT (Ex Utero Intrapartum Treatment) procedure.

⭐ For severe Twin-to-Twin Transfusion Syndrome (TTTS) diagnosed before 26 weeks (Quintero Stages II-IV), selective fetoscopic laser photocoagulation (SFLP) is the primary treatment.

Intrauterine Fetal Therapy - Navigating Risks, New Horizons

• Navigating Risks:
  • Maternal: Chorioamnionitis, PPROM, preterm labor, hemorrhage, anesthesia risks.
  • Fetal: Procedure-related trauma, fetal demise (risk varies, e.g., ~6% in MOMS trial), prematurity, infection.
• Ethical Considerations:
  • Dual patient dilemma: Mother & fetus.
  • Informed consent complexity.
  • Beneficence vs. Non-maleficence.
  • Justice in access to specialized centers.
• New Horizons:
  • Minimally invasive fetoscopy (e.g., spina bifida, TTTS laser).
  • Fetal gene therapy (experimental for monogenic disorders).
  • Stem cell transplantation (e.g., osteogenesis imperfecta).
  • Ex-utero intrapartum treatment (EXIT).

⭐ The MOMS trial (Management of Myelomeningocele Study) demonstrated that prenatal repair of myelomeningocele (between 19-26 weeks gestation) significantly improves motor outcomes and reduces the need for ventriculoperitoneal shunting compared to postnatal repair.

High‑Yield Points - ⚡ Biggest Takeaways

• Intrauterine transfusions (IUT) are crucial for severe fetal anemia, often due to Rh alloimmunization or parvovirus B19.
• Fetal shunting procedures (e.g., vesicoamniotic) manage obstructive uropathy like LUTO or large pleural effusions.
• Fetoscopic laser photocoagulation is the primary treatment for severe Twin-Twin Transfusion Syndrome (TTTS).
• Open fetal surgery is indicated for severe anomalies like myelomeningocele or congenital diaphragmatic hernia (CDH).
• Fetoscopic Endoluminal Tracheal Occlusion (FETO) can improve survival in severe CDH.