Persistent postoccipital dystocia

Persistent posterior occipital dystocia is due to the difficulty of childbirth because the fetal position cannot be changed to the normal fetal position during delivery. A type of persistent abnormal occipitoposterior abnormal fetal position is due to the fetal head connecting with the posterior occipital position during childbirth. During the descent process, when the double parietal diameter of the fetal head reaches or approaches the middle pelvic plane, most Can complete the internal rotation action, turn into anterior pillow natural delivery. 5% to 10% until the end of labor, the fetal headrest continues to be unable to turn forward, and is still located behind the mother's pelvis.