Discordance in twins: Association versus prediction

Area of Science:

• Perinatology
• Maternal-Fetal Medicine
• Obstetrics

Background:

• Fetal weight discordance is a critical factor influencing perinatal outcomes in twin pregnancies.
• The clinical significance of fetal growth discrepancy varies with gestational age (GA) at detection.

Purpose of the Study:

• To critically appraise the diagnosis and management of twin pregnancies with growth discordance.
• To analyze the impact of discordance detection timing (by trimester) on perinatal outcomes.

Main Methods:

• Review of current literature on twin pregnancy growth discordance.
• Analysis of associations between discordance, gestational age, and adverse perinatal outcomes.

Main Results:

• First-trimester discordance is associated with increased risk of anomalies, aneuploidy, and fetal loss, but has low predictive accuracy for perinatal outcomes.
• Third-trimester discordance is linked to fetal growth restriction, perinatal mortality, and morbidity.
• Monitoring for growth discrepancy is crucial throughout twin pregnancies.

Conclusions:

• The timing of fetal growth discrepancy detection in twin pregnancies is crucial for understanding associated risks.
• Management strategies should be tailored based on the trimester of discordance identification.
• Continued surveillance for growth discordance is essential for optimizing perinatal outcomes in twin gestations.