The placenta is a temporary but fundamental organ during pregnancy that performs vital functions for the development and well-being of the fetus.
Its position within the uterus can vary, and one of the possible locations is that of a posterior placenta.
In this article, we will explore in detail what it means to have one, what the implications are for pregnancy and childbirth, and what can be done in case of non-optimal positioning.
What does posterior placenta mean?
A posterior placenta occurs when this organ implants on the posterior wall of the uterus, the one closest to the mother’s spine.
This position is considered completely normal and does not in itself represent a cause for concern during pregnancy.
It’s important to note that the placenta can take different positions within the uterus:
- Anterior: when it implants on the anterior wall of the uterus, closer to the mother’s abdominal area.
- Posterior: when it implants on the posterior wall of the uterus, near the spine.
- Lateral: when it implants on one of the sides of the uterus.
- Fundal: when it implants in the upper part of the uterus, called the uterine fundus.
The posterior fundal placenta is a variant of the posterior position, in which the placenta is located in the upper part of the posterior wall of the uterus.
This position is considered favorable for pregnancy and natural childbirth.
In some cases, one can speak of a low posterior placenta, which indicates a situation where the placenta is in the lower part of the posterior wall of the uterus, closer to the cervix.
This condition requires more careful monitoring during pregnancy.
What is the optimal position for the placenta?
There is no universally recognized “optimal” position for the placenta, as different positions can be compatible with a healthy pregnancy and normal delivery. However, some positions are generally considered more favorable than others:
- Fundal placenta, that is, when the placenta implants in the fundus of the uterus, both anteriorly and posteriorly, is considered an ideal position. This location offers ample space for fetal growth and rarely causes complications during childbirth.
- High anterior or posterior placenta: these positions are also considered favorable, as they leave the lower part of the uterus free, facilitating the descent of the fetus during childbirth.
The posterior placenta, whether high or fundal, is generally considered an optimal position, as it does not interfere with the birth process and allows the fetus to assume the ideal position for birth.
It’s important to emphasize that the position of the placenta can change during pregnancy, especially in the first few months.
As the uterus grows, the placenta can “migrate” upward, moving away from the cervix. This phenomenon is known as “placental rise” and is completely normal.
What can be done when it is poorly positioned?
When talking about a “poorly positioned” placenta, this generally refers to situations such as placenta previa (when the placenta partially or totally covers the cervix) or placenta accreta (when the placenta attaches too deeply to the uterine wall). The posterior placenta, in itself, is not considered a problematic position.
However, in the case of a low posterior placenta, some precautions might be necessary:
- Regular monitoring: the doctor or midwife might recommend more frequent ultrasound checks to follow the position of the placenta during pregnancy.
- Rest: in some cases, a rest period might be advised to promote the rise of the placenta.
- Avoiding stressful activities: it might be suggested to avoid intense physical activities or situations that could cause stress to the body.
- Birth planning: if the placenta remains in a low position close to the end of pregnancy, it might be necessary to plan a cesarean delivery to avoid complications.
It is essential to follow your doctor’s or midwife’s instructions and not hesitate to ask for clarification or express any concerns.
It’s important to remember that each pregnancy is unique and that the position of the placenta is just one of many factors that healthcare professionals consider in evaluating the course of pregnancy and planning for childbirth.
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SOURCES
Burton GJ, Fowden AL. The placenta: a multifaceted, transient organ. Philos Trans R Soc Lond B Biol Sci. 2015 Mar 5;370(1663):20140066. doi: 10.1098/rstb.2014.0066. PMID: 25602070; PMCID: PMC4305167.