• Int J Gynaecol Obstet · Jun 2006

    Comparative Study

    Delivery of the posterior arm reduces shoulder dimensions in shoulder dystocia.

    • J Kung, A V Swan, and S Arulkumaran.
    • Department of Obstetrics and Gynaecology, St. George's University of London, London, UK.
    • Int J Gynaecol Obstet. 2006 Jun 1;93(3):233-7.

    ObjectiveTo evaluate a possible reduction in shoulder diameter and circumference by extending the posterior arm during delivery, for an easier birth in cases of shoulder dystocia.MethodsIn this study of 33 neonates the bisacromial diameter and axilloacromial circumference were measured within 72 h of birth, first with the neonate's arms by its chest and then with 1 arm extended above its head. Reductions in diameter and circumference were evaluated.ResultsThe mean +/- SD differences in bisacromial diameter and axilloacromial circumference were 1.9 +/- 0.69 cm and 2.52 +/- 1.18 cm, respectively. A greater reduction was observed in neonates with a greater shoulder diameter.ConclusionIn cases of shoulder dystocia, delivery of the posterior arm should significantly reduce shoulder dimensions, especially in larger fetuses, and prevent a need for excessive traction.

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