Prospective risk of stillbirth in multiple-gestation pregnancies: a population-based analysis

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Abstract
OBJECTIVE: To evaluate the prospective risk of stillbirth in multiple gestations. METHODS: We conducted a retrospective analysis of birth notifications and infant mortality records relating to all multiple gestations to residents in a predefined health district. The incidence of live births and stillbirths was used to calculate the prospective risk of stillbirth at each week of gestation. RESULTS: The risk of stillbirth in multiple gestations increased from 1:3333 at 28 weeks’ gestation to 1:69 at 39 or more weeks’ gestation. The stillbirth risk in multiple gestations at 39 weeks surpassed that of postterm singleton pregnancies (1:526). CONCLUSION: Multiple gestations at 37–38 weeks have a risk of stillbirth equivalent to that of postterm singleton pregnancy. Because multiple gestations rarely proceed beyond 39 weeks, and because stillbirth risk increases several-fold beyond this stage, elective delivery might be justified at this gestational age.

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