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http://oacapps.med.jhmi.edu/OBGYN-101/Text/Abnormal%20L&D/fetal_position.htm
Occiput anterior is usually the easiest position for the fetal head to traverse the maternal pelvis. Shown here is the "direct OA" position. While some fetuses deliver in this position, others deliver slightly rotated clockwise (LOA) or counterclockwise (ROA).
https://www.incision.care/courses/occiput-anterior-delivery/
The occiput anterior presentation is the most efficient way for a normally proportioned fetus to pass through a gynecoid pelvis and occurs in around 85% of all vaginal deliveries. In an occiput anterior presentation the lie is longitudinal with a cephalic presentation
https://medlineplus.gov/ency/patientinstructions/000621.htm
The ease at which this passage will take place depends on how your baby is positioned during delivery. The best position for the baby to be in to pass through the pelvis is with the head down and the body facing towards the mother's back. This position is called occiput anterior (OA).
https://spinningbabies.com/learn-more/baby-positions/other-fetal-positions/right-occiput-anterior-roa/
In Right Occiput Anterior (ROA), the back of the baby is more on the mother’s right side than on her left side. In other words, The back is to the mother’s right, and the baby is facing towards the roomy sciatic notch in the back left of her pelvis.
https://www.momjunction.com/articles/ways-to-avoid-having-an-occiput-posterior-position_0082926/
Jan 18, 2020 · Most babies, who are in the occiput posterior position before labor, tend to rotate to the occiput anterior (OA) position after the labor sets in. Some posterior babies may get delivered without any slowdown in labor, while some may take time but require no obstetric interventions.
https://www.uptodate.com/contents/occiput-posterior-position#!
Feb 14, 2019 · Before labor, 15 to 20 percent of term fetuses in cephalic presentation are OP, but only 5 percent are OP at vaginal delivery because most OP fetuses spontaneously rotate to an anterior position during labor . Some persistent OP positions may be due to an android maternal pelvis, as the mechanical forces on the fetus during the cardinal movements of labor in this setting can inhibit rotation to the occiput anterior …
https://www.medicalopedia.org/1154/fetal-position/
Apr 28, 2011 · Occiput anterior is usually the easiest position for the fetal head to traverse the maternal pelvis. Shown here is the “direct OA” position. While some fetuses deliver in this position, others deliver slightly rotated clockwise (LOA) or counterclockwise (ROA). Either way, the fetus is still considered to be an an “anterior” position.
https://www.verywellfamily.com/fetal-positions-for-labor-and-birth-2759020
The right occiput anterior (ROA) presentation is also common in labor. In this position, the back of the baby is slightly off center in the pelvis with the back of the head toward the mother's right thigh. In general, OA positions do not lead to problems or additional pain during labor or birth.
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