Fetal reduction from twins to a singleton: a reasonable consideration?

Area of Science:

• Maternal-Fetal Medicine
• Reproductive Health
• Obstetrics

Background:

• Historically, multifetal pregnancy reduction to a singleton was reserved for severe maternal or fetal conditions.
• An increasing number of women, particularly those over 40, are seeking counseling for singleton reduction.
• This trend prompted a re-evaluation of previous clinical stances on the procedure.

Purpose of the Study:

• To review the safety and outcomes of multifetal pregnancy reduction to a singleton.
• To compare these outcomes with existing data on twin and singleton pregnancies.
• To assess the viability of offering singleton reduction more broadly.

Main Methods:

• A retrospective review of 52 cases of first-trimester twin-to-singleton multifetal pregnancy reduction performed by a single operator.
• Comparison of outcomes with national register data for twin and singleton pregnancies.
• Analysis of patient demographics, including advanced maternal age.

Main Results:

• The study included a significant proportion of women aged 35 and older (40/52), with several over 40 and 50.
• Fifty-one out of 52 pregnancies reached viability, with a mean gestational age of 37.2 weeks.
• The miscarriage rate was 1.9% (1/52), which is lower than spontaneous loss rates in untreated twin pregnancies.

Conclusions:

• Multifetal pregnancy reduction to a singleton, once rare due to safety concerns, has demonstrated improved safety and efficacy.
• The data suggest that reducing twins to a singleton can lead to a higher chance of a successful birth compared to continuing a twin pregnancy.
• The study proposes that twin-to-singleton reductions be considered with appropriate safeguards and constraints.