The Relationship Between Intertwin Membrane Separation and Pregnancy Outcome

Area of Science:

• Maternal-Fetal Medicine
• Perinatology
• Reproductive Health

Background:

• Dichorionic twin pregnancies present unique management challenges.
• Intertwin membrane separation is a recognized sonographic finding.
• The impact of spontaneous intertwin membrane separation on pregnancy outcomes requires further clarification.

Purpose of the Study:

• To investigate the association between spontaneous intertwin membrane separation and pregnancy outcomes in dichorionic twins.
• To compare adverse pregnancy outcomes between dichorionic twins with and without intertwin membrane separation.

Main Methods:

• Retrospective cohort study comparing women with dichorionic twins diagnosed with spontaneous intertwin membrane separation to controls.
• Control group comprised of dichorionic twins without intrauterine procedures.
• Logistic regression analysis to assess the association with preterm delivery.

Main Results:

• The rate of preterm delivery was significantly lower in the intertwin membrane separation group (48%) compared to controls (76%) (OR 0.29, P=.01).
• Neonatal intensive care unit admission rates were also lower in the case group (37% vs. 61%, OR 0.37, P=.04).
• No significant association found between intertwin membrane separation and adverse pregnancy outcomes.

Conclusions:

• Spontaneous intertwin membrane separation in dichorionic twin pregnancies is not associated with adverse outcomes.
• Expectant management is a viable and reasonable approach for these pregnancies.
• Findings support current clinical practice guidelines for managing dichorionic twins.