摘要
Background Twin gestations are associated with an increased risk of pregnancy complications such as preterm birth,hypertensive disorders of pregnancy(HDP),and fetal growth restriction(FGR).1-5 Twin pregnancies are characterized by.a slower fetal growth compared to singletons during the third trimester.The mechanisms underlying this phenomenon and whether it represents a pathological FGR or a harmless physiologic adaptation are currently unclear6.One important implication of these questions relates to the growth charts that should be used by care providers to monitor growth of twins.If the slower growth represents a pathology,then singleton growth charts should be used to identify the small twin fetus which may be at an increased risk of mortality and morbidity.If,however,the slower growth of twins reflects a benign adaptation,then twin-based charts may be preferable to avoid overdiagnosis of FGR in twin gestations.
