Twin pregnancy complicated by selective growth restriction

Area of Science:

• Maternal-Fetal Medicine
• Reproductive Biology
• Genetics

Background:

• Selective intrauterine growth restriction (sIUGR) in twin pregnancies poses significant management challenges.
• Understanding sIUGR pathophysiology, especially in monochorionic twins, is crucial for effective treatment.
• Unequal placental sharing is the primary cause of sIUGR in monochorionic twins.

Purpose of the Study:

• To review current knowledge on sIUGR pathophysiology in monochorionic pregnancies.
• To evaluate early trials of fetal interventions for high-risk sIUGR.
• To explore management strategies for sIUGR in twin pregnancies.

Main Methods:

• Review of existing literature on sIUGR pathophysiology and management.
• Analysis of outcomes from early fetal intervention trials.
• Classification of monochorionic sIUGR using umbilical artery Doppler studies.

Main Results:

• Clinical outcomes in sIUGR are influenced by placental vascular anastomoses characteristics.
• Umbilical artery Doppler classification aids in targeting interventions for high-risk sIUGR subgroups.
• Overall survival rates are comparable between cord occlusion and selective laser photocoagulation for early-onset Type II/III sIUGR.

Conclusions:

• Fetal interventions are feasible and potentially beneficial for early-onset sIUGR in monochorionic twins.
• Cord occlusion or selective laser photocoagulation can be considered alternatives to expectant management or preterm delivery.
• Further randomized controlled trials are necessary to confirm efficacy and assess neurological outcomes.