Significance of biparietal diameter differences between twins

Area of Science:

• Perinatology
• Maternal-Fetal Medicine
• Neonatology

Background:

• Twin gestations carry increased risks for adverse delivery and neonatal outcomes.
• Dissimilar fetal growth, particularly when severe, is a critical indicator of potential complications.
• Monitoring fetal growth parameters like biparietal diameter (BPD) and birthweight is essential in twin pregnancies.

Purpose of the Study:

• To investigate the correlation between significant differences in fetal growth parameters and adverse outcomes in twin pregnancies.
• To establish reference ranges for biparietal diameter (BPD) and birthweight discrepancies in twins with normal versus poor outcomes.

Main Methods:

• Retrospective analysis of sonographic data from 74 twin sets.
• Comparison of biparietal diameter (BPD) and birthweight differences between twins with normal and poor outcomes in the final scan before delivery.
• Statistical analysis to determine the significance of observed differences (P < 0.01).

Main Results:

• Twins with normal outcomes showed a mean BPD difference of 1.32 mm and a birthweight difference of 250.3 g.
• Twins with poor outcomes (intrauterine fetal demise or severe intrauterine growth retardation) exhibited significantly larger mean differences: 6.86 mm for BPD and 604.3 g for birthweight.
• Both BPD and birthweight differences were statistically significant (P < 0.01) between the two groups.

Conclusions:

• Large discrepancies in biparietal diameter (BPD) between twins are a potential indicator of compromised fetal well-being.
• Significant differences in BPD and birthweight can help identify twin gestations at higher risk for adverse outcomes.
• Early identification of growth discordance in twins through sonography is crucial for timely intervention and improved neonatal care.