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  • Title: Risk of shoulder dystocia in second delivery: does a history of shoulder dystocia matter?
    Author: Overland EA, Spydslaug A, Nielsen CS, Eskild A.
    Journal: Am J Obstet Gynecol; 2009 May; 200(5):506.e1-6. PubMed ID: 19268881.
    Abstract:
    OBJECTIVE: Our aim was to estimate the relative and absolute risk of shoulder dystocia in the second delivery according to history of shoulder dystocia and offspring birthweight. STUDY DESIGN: A retrospective cohort study including all women in Norway with 2 consecutive singleton vaginal deliveries with fetus in cephalic presentation, during the period 1967-2005 (n = 537,316). RESULTS: In the second delivery shoulder dystocia occurred in 0.8% of all women. In women with a prior shoulder dystocia the recurrence risk was 7.3%. Most cases of shoulder dystocia in second delivery were in women without such history (96.2%). Offspring birthweight was the most important risk factor for shoulder dystocia in second delivery: crude odds ratio, 292.9 (95% confidence interval, 237.8-360.7) comparing birthweight > 5000 g with 3000-3499 g. CONCLUSION: Prior shoulder dystocia increased the risk of shoulder dystocia in the second delivery. However, offspring birthweight was by far the most important risk factor.
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