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  • Title: Cervical length dynamics in triplet pregnancies: a retrospective cohort study.
    Author: Pils S, Springer S, Wehrmann V, Chalubinski K, Ott J.
    Journal: Arch Gynecol Obstet; 2017 Aug; 296(2):191-198. PubMed ID: 28540576.
    Abstract:
    PURPOSE: To review our experience with a screening program that included sequential cervical length measurements in our large population of triplet pregnancies. METHODS: Seventy-eight triplet pregnancies were retrospectively included. Cervical length measurements were performed by transvaginal ultrasound in 2-week intervals from week 16 + 0 onwards in a tertiary-care center in Vienna. The main outcome measurement was preterm delivery prior to 32 + 0 weeks of gestation. Statistical analyses were performed using paired and unpaired t tests and a stepwise linear regression model. RESULTS: There were 26 cases of preterm delivery (33.3%). Women with preterm delivery revealed significant cervical length shortening from week 22 + 0 (median 33 mm, interquartile range, IQR 17-39) to 24 + 0 (median 21 mm, IQR 7-30; p = 0.005). This was not observed in women without preterm delivery. From week 22 + 0 onwards, both groups showed further significant 2-week differences in cervical length (p < 0.05). Univariate analysis of cervical length in weeks 20 + 0, 22 + 0, and 24 + 0 as well as cervical length dynamics from 22 + 0 to 24 + 0 predicted preterm delivery. CONCLUSIONS: In triplet pregnancies, a decrease in cervical length seems physiological from week 22 + 0 onwards. A sharp decrease in cervical length from the 22 + 0 to the 24 + 0 week as well as the smaller cervical length in weeks 20 + 0, 22 + 0, and 24 + 0 increase the risk of preterm delivery.
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