O44 Placenta previa

Name of the Condition

• Placenta Previa

Summary

Placenta previa is a pregnancy complication where the placenta partially or fully covers the cervix, potentially obstructing vaginal delivery. This condition can lead to bleeding during pregnancy or labor and requires careful monitoring to manage risks to both mother and fetus.

Causes

The exact cause is not fully understood, but it often involves abnormal placental implantation in the lower uterine segment. Factors such as uterine scarring or abnormal vascularization may contribute to its development.

Risk Factors

• Previous placenta previa
• Multiple pregnancies (e.g., twins, triplets)
• Prior uterine surgery (e.g., cesarean section, dilation and curettage)
• Advanced maternal age (over 35)
• Smoking or substance use during pregnancy
• Multiparity (having given birth multiple times)

Symptoms

• Painless vaginal bleeding, typically in the second or third trimester
• Sudden, bright red bleeding without pain (common presentation)
• Possible abdominal cramping or uterine contractions in some cases

Diagnosis

Diagnosis is confirmed via transabdominal or transvaginal ultrasound, which visualizes the placenta's position relative to the cervix. Additional imaging or monitoring may be used to assess bleeding or fetal well-being.

Treatment Options

• Bed rest or activity restriction to reduce bleeding risk
• Close monitoring of maternal and fetal status
• Corticosteroids to enhance fetal lung maturity if preterm delivery is likely
• Blood transfusion if significant hemorrhage occurs
• Cesarean delivery, often planned if previa persists near term

Prognosis and Follow-Up

With proper management, outcomes are generally favorable. Follow-up includes regular prenatal visits, ultrasounds, and monitoring for recurrent bleeding. Most cases resolve as the uterus grows, but persistent previa may require earlier delivery.

Complications

• Severe maternal hemorrhage
• Preterm birth
• Fetal growth restriction
• Placenta accreta (abnormal placental attachment)
• Maternal or fetal mortality in rare, unmanaged cases

Lifestyle & Prevention

• Avoid activities that may increase bleeding risk (e.g., intercourse, strenuous exercise)
• Attend all prenatal appointments for monitoring
• Follow provider guidance on activity levels and rest
• Avoid smoking or substance use during pregnancy

When to Seek Professional Help

Seek immediate care for:

• Sudden, heavy vaginal bleeding
• Severe abdominal pain or cramping
• Signs of shock (dizziness, fainting, rapid heartbeat)
• Decreased fetal movement

Tips for Medical Coders

Document the placenta's exact position (partial vs. complete) and any associated hemorrhage or trimester details. Ensure clinical notes specify whether bleeding occurred and if the previa resolved or persisted. Code O44 is used for placenta previa without hemorrhage; specify hemorrhage separately if present.