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  • Title: Recurrent shoulder dystocia: analysis of incidence and risk factors.
    Author: Ouzounian JG, Gherman RB, Chauhan S, Battista LR, Lee RH.
    Journal: Am J Perinatol; 2012 Aug; 29(7):515-8. PubMed ID: 22495895.
    Abstract:
    OBJECTIVES: To determine the rate and associated risk factors for recurrent shoulder dystocia (SD). STUDY DESIGN: A retrospective analysis was performed of patients delivered from January 1991 to June 2001. Patients with and without recurrent SD were identified and compared. RESULTS: Among the 267,228 vaginal births during the study period, there were 1904 cases of SD (0.7%) and 270 patients with one additional vaginal birth. The recurrent SD rate was higher than the general population (3.7% versus 0.7%, odds ratio 7.36, 95% confidence interval 3.68 to 14.23, p < 0.001). Patients with recurrent SD had a slightly higher mean birth weight with the second delivery, but this difference was not statistically significant (4173 ± 544 g versus 4017 ± 577 g, p = 0.39). CONCLUSION: Prior SD is a risk factor for recurrence in a subsequent delivery, but our results demonstrate that the rate appears to be lower than previously estimated. Most variables, including birth weight, do not appear to be useful parameters in predicting recurrence.
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