Risk factors for placenta praevia

Area of Science:

• Obstetrics and Gynecology
• Reproductive Health
• Clinical Epidemiology

Background:

• Placenta previa is a pregnancy complication where the placenta partially or totally covers the cervix.
• Identifying risk factors is crucial for timely diagnosis and management to improve maternal and fetal outcomes.

Purpose of the Study:

• To investigate and analyze the risk factors associated with the occurrence of placenta previa.
• To quantify the relative risk (RR) of placenta previa based on various maternal and obstetric characteristics.

Main Methods:

• A case-control study was conducted in Milan, Italy, involving 140 cases of placenta previa.
• 280 control subjects were selected consecutively following each case from 49,765 deliveries between 1979 and 1991.
• Clinical records were reviewed to gather data on potential risk factors.

Main Results:

• Advanced maternal age was associated with an increased risk of placenta previa (RR = 3.7, 95% CI: 2.3-6.7).
• Previous abortions (RR = 1.8, 95% CI: 1.2-2.8) and multiple previous pregnancies (RR = 1.9, 95% CI: 1.1-3.3) also increased the risk.
• No significant association was found with the sex of the newborn or multiple pregnancies.

Conclusions:

• Older maternal age and a history of abortions are confirmed as significant risk factors for placenta previa.
• Parity and previous cesarean sections showed non-significant trends in risk.
• These findings can inform clinical practice and patient counseling regarding placenta previa risk.