Is occiput posterior position an abnormal fetal position?
Aug 27, 2023
Source: Cainiu Health
Dr. Lv Aiming
Introduction
Occiput posterior position is a fetal presentation, also known as posterior occipital position or back-to-back position. In this position, the fetal head is located at the maternal pelvic inlet, while the fetus's back lies against the mother's spine. Compared to the common cephalic presentation, occiput posterior position is considered an abnormal fetal position. Normally, the fetus should be in cephalic presentation, with the head oriented toward the maternal pelvic inlet.
Occiput posterior position is an abnormal fetal presentation. The detailed analysis is as follows:
Occiput posterior position, also known as occiput posterior presentation or posterior cervical position, refers to a fetal position in which the fetal head is located at the maternal pelvic inlet while the fetal back lies against the mother's spine. Compared with the common cephalic presentation, occiput posterior position is considered an abnormal fetal presentation. Normally, the fetus should be in cephalic presentation, meaning the head is directed toward the maternal pelvic inlet. This positioning facilitates smooth passage through the birth canal and reduces the risks associated with delivery. However, the fetus may assume an occiput posterior position before labor due to factors such as fetal position, uterine malformation, or multiple pregnancies. Management options include external version or emergency cesarean section when necessary.
It should be noted that an occiput posterior position does not necessarily lead to complications or difficult labor. Some fetuses in this position can still be delivered vaginally without problems. Nevertheless, because the occiput posterior position may increase the risk of delivery complications, physicians typically closely monitor both fetal and maternal conditions and implement appropriate interventions when needed.
