Objective: The aim of this study was to evaluate pregnancy complications and obstetric and perinatal outcomes in women with twin pregnancy and GDM. STUD DESIGN: An observational multicentre retrospective study was performed and 534 pregnant woman and 1068 twins infants allocated into two groups, 257 with GDM and 277 controls, were studied.
Main outcome measures: Pregnant women characteristics, hypertensive complications, preterm delivery rate, mode of delivery and birthweight were analysed.
Results: Pregnant women with GDM were older (p < 0.001) and had higher body mass index (p < 0.001) than controls. GDM was associated with higher risk of prematurity in twin pregnancy (odds ratio 1.64, 95% confidence interval [1.14-2.32], p = 0.005). This association was based on the association with other pregnancy complications. Birthweight Z-scores were significantly higher in the GDM group (p = 0.02). The rate of macrosomia was higher in the GDM group (p = 0.002) and small for gestational age (SGA) babies were significantly less frequent (p = 0.03). GDM was an independent predictor of macrosomia (p = 0.006).
Conclusion: The presence of GDM in twin pregnancy was associated with a higher risk of hypertensive complications, prematurity and macrosomia, but significantly reduces the risk of SGA infants. Prematurity was related to the presence of other associated pregnancy complications.