Early low-lying placentae--ultrasonic assessment, progress and outcome

Area of Science:

• Obstetrics and Gynecology
• Fetal Medicine
• Diagnostic Imaging

Background:

• Low-lying placentae diagnosed in early pregnancy are common.
• The natural course and resolution rates of these placentae require further investigation.

Purpose of the Study:

• To determine the resolution rate of low-lying placentae diagnosed before 20 weeks gestation.
• To assess the necessity of routine follow-up ultrasound scans after 32 weeks gestation for placental position.

Main Methods:

• Prospective study design.
• Inclusion of 100 patients with low-lying placentae and 64 matched controls.
• Ultrasound monitoring of placental position throughout gestation.

Main Results:

• 94% of low-lying placentae resolved by 32 weeks gestation.
• Only 2% of cases required cesarean section for placenta previa.
• No increased incidence of intrauterine growth retardation or preeclampsia was observed.

Conclusions:

• Routine ultrasound re-checks for placental position after 32 weeks are generally unnecessary.
• Follow-up scans are recommended for posterior low-lying placentae, which are more likely to persist.
• Avoiding unnecessary scans reduces maternal anxiety and ultrasound exposure.