Abstract
Purpose
To estimate the risk of shoulder dystocia (SD) in pregnancies with/without maternal diabetes or obesity; to identify antenatal maternal and fetal ultrasound-derived risk factors and calculate their contributions.
Methods
A multicenter retrospective analysis of 13,428 deliveries in three tertiary hospitals (2014–2017) with fetal ultrasound data ≤ 14 days prior to delivery (n = 7396). Inclusion criteria: singleton pregnancies in women ≥ 18 years old; vertex presentation; vaginal delivery at ≥ 37 weeks of gestation. Estimated fetal weight (EFW) and birth weight (BW) were categorized by steps of 250 g. To evaluate risk factors, a model was performed using ultrasound data with SD as the dependent variable.
Results
Diabetes was present in 9.3%; BMI ≥ 30 kg/m2 in 10.4% and excessive weight gain in 39.8%. The total SD rate was 0.9%, with diabetes 2.0% and with obesity 1.9%. These increased with BW 4250–4499 g compared to 4000–4249 g in women with diabetes (12.1% vs 1.9%, P = 0.010) and without (6.1% vs 1.6%, P < 0.001) and at the same BW threshold for women with obesity (9.6% vs 0.6%, P = 0.002) or without (6.4% vs 1.8%, P < 0.001). Rates increased similarly for EFW at 4250 g and for AC–HC at 2.5 cm. Independent risk factors for SD were EFW ≥ 4250 g (OR 3.8, 95% CI 1.5–9.4), AC–HC ≥ 2.5 cm (OR 3.1, 95% CI 1.3–7.5) and diabetes (OR 2.2, 95% CI 1.2–4.0). HC/AC ratio, obesity, excessive weight gain and labor induction were not significant.
Conclusion
Independent of diabetes, which remains a risk factor for SD, a significant increase may be expected if the EFW is ≥ 4250 g and AC–HC is ≥ 2.5 cm.
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Availability of data and material
The data that support the findings of the study are available on reasonable request from the corresponding author.
Code availability
IBM SPSS Statistics Version 25.0 (Armonk, NY, USA).
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Acknowledgements
We would like to thank the team of midwives, nurses and physicians from the three participating obstetrics wards for their support in caring for pregnant women and recording clinical data.
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JV study design, data collection, data analysis, interpretation of study findings, manuscript writing and editing. CAED data analysis and interpretation, manuscript editing. LD, HV data collection, manuscript editing. CK, WH, BR, DS, MA-D manuscript editing. MJAM interpretation of study findings, manuscript editing. UMS-G study design, data analysis, interpretation of study findings, manuscript editing. All authors approved the final draft for publication.
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UMS-G received remuneration for lectures by pharmaceutical companies (Novo Nordisk, Berlin-Chemie, Sanofi-Aventis). MJAM received an honorarium from Novo Nordisk for chairing the Drug Monitoring Committee on a trial comparing two of their long-acting insulins in type 1 diabetes. The remaining authors report no conflict of interest. The contributing authors are solely responsible for the content of the manuscript.
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This study was performed in line with the principles of the Declaration of Helsinki and received ethical approval (Eth-33/16 Berlin Medical Association).
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The need for individual written consent was waived by the local Ethics Committee of Berlin Medical Association in view of the retrospective nature of the study. All data were stored and analyzed anonymously.
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Vetterlein, J., Doehmen, C.A.E., Voss, H. et al. Antenatal risk prediction of shoulder dystocia: influence of diabetes and obesity: a multicenter study. Arch Gynecol Obstet 304, 1169–1177 (2021). https://doi.org/10.1007/s00404-021-06041-7
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DOI: https://doi.org/10.1007/s00404-021-06041-7