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- W4220724299 abstract "To assess the correlation between fetal head regression and levator ani muscle (LAM) co-activation under Valsalva maneuver.This study was a secondary analysis of a prospective cohort study on the association between the angle of progression (AoP) and labor outcome. We scanned a group of nulliparous women at term before the onset of labor at rest and under maximum Valsalva maneuver. In addition to the previously calculated AoP, in the present study, we measured the anteroposterior diameter of LAM hiatus (APD) on each ultrasound image. LAM co-activation was defined as APD at Valsalva less than that at rest, whereas fetal head regression was defined as AoP at Valsalva less than that at rest. We calculated the correlation between the two phenomena. Finally, we examined various labor outcomes according to the presence, absence, or co-existence of these two phenomena.We included 469 women. A total of 129 (27.5%) women presented LAM co-activation while 50 (10.7%) showed head regression. Only 15 (3.2%) women showed simultaneous head regression and LAM co-activation. Women with coexisting LAM co-activation and head regression had the narrowest AoP at Valsalva in comparison with other study groups (p < .001). In addition, they had the highest risk of Cesarean delivery (40%) and longest first, second, and active second stage durations, although none of these reached statistical significance.In nulliparous women at term before the onset of labor fetal head regression and LAM co-activation at Valsalva are two distinct phenomena that uncommonly coexist." @default.
- W4220724299 created "2022-04-03" @default.
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- W4220724299 date "2022-03-13" @default.
- W4220724299 modified "2023-10-14" @default.
- W4220724299 title "The correlation between levator ani co-activation and fetal head regression on maternal pushing at term" @default.
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- W4220724299 doi "https://doi.org/10.1080/14767058.2022.2050363" @default.
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