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AoP measurement may help in choosing between forceps and vacuumextraction.
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Above this value, the rate of vacuumextraction failure fell below 5%.
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One patient had a lesion 4 months following a vacuumextraction and subsequent cephalohematoma formation.
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Transperineal ultrasound was performed immediately before vacuumextraction, although AoP was measured on stored images after delivery.
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Radiological feature … One patient had a lesion 4 months following a vacuumextraction and subsequent cephalohematoma formation.
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Conclusion: AoP is a predictive factor of failed vacuumextraction, especially among nulliparous women whose risk of failure is high.
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PMID: 18976110 One patient had a lesion 4 months following a vacuumextraction and subsequent cephalohematoma formation.
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As all but one failed vacuumextraction occurred among nulliparous women, the predictive value of AoP was calculated in this subgroup of women.
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Methods: This was a prospective observational study that included women with a singleton pregnancy of ≥ 37 weeks' gestation, in cephalic presentation requiring vacuumextraction.
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The area under the receiver-operating characteristics curve for prediction of vacuumextraction failure was 0.67 (95% CI, 0.57-0.77) and the optimal AoP cut-off was 145.5°.
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Vacuumextraction was defined as failed when the duration of extraction exceeded 20 min or the vacuum cup detached more than three times.