Prenatal diagnosis for multiple pregnancies.

Area of Science:

• Maternal-fetal medicine
• Prenatal diagnostics
• High-risk pregnancy management

Background:

• First trimester ultrasound is vital for multiple pregnancies, assessing chorionicity, structural defects, and chromosomal abnormalities via nuchal translucency.
• Combining nuchal translucency screening with first trimester maternal serum screening may improve diagnostic efficacy in twins.
• Risks of chorionic villi sampling and amniocentesis are similar in twins, but chorionic villi sampling allows for earlier selective termination.

Purpose of the Study:

• To review the role of first trimester ultrasound and invasive procedures in managing multiple pregnancies.
• To discuss diagnostic and therapeutic options for chromosomal abnormalities and complications like twin-to-twin transfusion syndrome.
• To highlight advancements in selective termination techniques and management of monochorionic pregnancies.

Main Methods:

• Review of current literature on first trimester ultrasound, genetic screening, and invasive diagnostic procedures in multiple pregnancies.
• Analysis of techniques for selective termination in monochorionic and dichorionic twins.
• Evaluation of current and emerging treatments for twin-to-twin transfusion syndrome.

Main Results:

• First trimester ultrasound is essential for diagnosing chorionicity, structural defects, and screening for chromosomal abnormalities.
• Chorionic villi sampling offers advantages for first trimester selective termination, despite potential for ambiguous results.
• Selective termination is more hazardous in monochorionic than dichorionic pregnancies; twin-to-twin transfusion syndrome outcomes have improved with laser photocoagulation and amniodrainage.

Conclusions:

• First trimester management of multiple pregnancies involves a combination of ultrasound, screening, and judicious use of invasive procedures.
• Selective termination techniques have advanced, but careful consideration of pregnancy type (monochorionic vs. dichorionic) is crucial.
• Further research is needed to optimize therapeutic strategies for twin-to-twin transfusion syndrome and other multifetal pregnancy complications.