Continuous posterior occipital and lateral occipital positions

Abnormal fetal position is one of the common causes of dystocia. Anterior occipital (normal fetal position) accounted for about 90%, and abnormal fetal position accounted for about 10% during childbirth. Among them, the abnormal position of the fetal head was mostly abnormal. There were continuous lateral occipital lateral position and continuous posterior occipital position due to fetal head rotation in the pelvic cavity. Position; there are faces exposed first and forehead exposed due to poor fetal head flexion; as well as high upright position, forward unevenness, etc., accounting for about 6% to 7%. Abdominal first exposure is about 3% to 4%, and shoulder first exposure is rare. In addition, there are compound first exposures. During delivery, the fetal head is connected in the posterior or lateral position. During the descent, the occipital region of the fetal head can be turned forward by 135 ° or 90 ° due to the strong contractions. Natural delivery. If the fetal occipital bone cannot continue to turn forward until the end of the childbirth, it is still located behind or to the side of the mother's pelvis, which causes difficulties in childbirth. position).

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