Ultrasound examination of the pelvic floor during active labor: A longitudinal cohort study.
Torbjørn Moe EggebøSigurlaug BenediktsdottirHulda HjartardottirKjell Å SalvesenIngrid I VolløyhaugPublished in: Acta obstetricia et gynecologica Scandinavica (2023)
We found a significant, but only modest, increase of the hiatal dimensions during the first stage of labor. The risk of levator ani trauma will therefore be low during this stage. The change in transverse hiatal diameter was associated with fetal descent but not with head position.