Why the study?
Although a larger difference between transverse abdominal diameter and biparietal diameter (TAD-BPD) is a reported risk factor for shoulder dystocia, it remained unclear whether this association is relevant in Japan.
Does a larger difference between transverse abdominal diameter and biparietal diameter (TAD-BPD) predict shoulder dystocia in Japanese women delivering vaginally?
Population
1,866 Japanese women who delivered vaginally between 37+0 and 41+6 weeks of gestation
Comparison
TAD-BPD values associated with shoulder dystocia
Design
Retrospective observational cohort study
Authors
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TAD-BPD may associate with shoulder dystocia in Japan; extends prior reports but leaves open clinical utility.
Does a larger difference between transverse abdominal diameter and biparietal diameter (TAD-BPD) predict shoulder dystocia in Japanese women delivering vaginally?
A TAD-BPD difference ≥12.0 mm is associated with an increased risk of shoulder dystocia, but its low positive predictive value limits its utility as a screening tool.
Shinohara et al. (2021) studied this question.
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