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Anterior Placenta: Causes, Symptoms & Birth
An anterior placenta is one that attaches to the front wall of the uterus. It is a common, usually uncomplicated variation of placental position during pregnancy.
Things worth knowing about "Anterior placenta"
An anterior placenta is one that attaches to the front wall of the uterus. It is a common, usually uncomplicated variation of placental position during pregnancy.
What Is an Anterior Placenta?
An anterior placenta is a placenta that has implanted on the front wall of the uterus, the side facing the mother's abdomen. The placenta is the vital organ that develops during pregnancy to supply the baby with nutrients and oxygen. Its position within the uterus can vary: it may attach to the front (anterior), back (posterior), side (lateral), or bottom (low-lying) of the uterine wall.
An anterior placenta is a common finding and is considered a normal variation of placental positioning in most cases. It does not typically pose any health risks to the mother or the baby.
Causes and Development
The position of the placenta is determined by where the fertilised egg implants in the uterus. If implantation occurs along the front wall of the uterus, the placenta develops there. This is a natural variation that cannot be influenced by the mother's behaviour or lifestyle choices.
Certain factors may slightly increase the likelihood of an anterior placenta:
- Previous caesarean sections (scar tissue on the front uterine wall)
- Prior uterine surgeries or procedures
- In vitro fertilisation (IVF)
Symptoms and Effects
An anterior placenta does not typically cause any symptoms or discomfort. However, many pregnant women notice that fetal movements are felt later and less intensely than with a posterior placenta. This is because the placenta acts as a cushion between the baby and the mother's abdominal wall, dampening the sensation of kicks and turns.
- Later perception of fetal movements (typically from around 20 to 24 weeks rather than 18 weeks)
- Softer or muffled sensation of kicks and rolls
- Occasionally, challenges in obtaining a clear cardiotocography (CTG) reading
Diagnosis
The position of the placenta is routinely assessed during ultrasound examinations as part of standard antenatal care. The placental location is typically confirmed at the mid-pregnancy anomaly scan, usually between 19 and 22 weeks of gestation. A follow-up scan may be recommended towards the end of pregnancy to assess the exact position of the placenta relative to the cervix.
Possible Complications
In the vast majority of cases, an anterior placenta is completely uncomplicated. In rare situations, however, the following may occur:
- Placenta praevia: If the placenta lies low and partially or fully covers the cervix, it can cause bleeding and prevent a vaginal birth. This is not specific to the anterior position.
- Placenta accreta: Particularly in women with previous caesarean sections, the placenta may grow deeper into the uterine wall. This is a rare but serious complication.
- Challenging amniocentesis: If a amniotic fluid test is required, the clinician may need to adjust the needle angle to avoid puncturing the placenta.
Management and Outlook
An anterior placenta generally requires no specific treatment. Pregnant women are advised to monitor their baby's movements and to seek medical advice promptly if they notice a significant reduction or absence of fetal movements.
In most cases of an uncomplicated anterior placenta, a vaginal delivery is possible. If placenta praevia or another complication is present, a caesarean section may be recommended.
Guidance for pregnant women with an anterior placenta:
- Attend all scheduled antenatal appointments and ultrasound scans
- Monitor fetal movements daily from around 24 weeks of gestation
- Contact a healthcare provider immediately if fetal movements are reduced or absent
- Maintain open communication with your midwife or obstetrician
References
- Cunningham FG et al. - Williams Obstetrics, 25th edition. McGraw-Hill Education, 2018.
- Royal College of Obstetricians and Gynaecologists (RCOG) - Placenta Praevia and Placenta Accreta: Diagnosis and Management. Green-top Guideline No. 27a, 2018.
- World Health Organization (WHO) - WHO Recommendations on Antenatal Care for a Positive Pregnancy Experience. WHO Press, Geneva, 2016.
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