O45.012 Premature separation of placenta with afibrinogenemia, second trimester

Name of the Condition

• Premature Separation of Placenta with Afibrinogenemia, Second Trimester (O45.012)

Summary

Premature separation of placenta with afibrinogenemia in the second trimester is a pregnancy complication where the placenta detaches from the uterine wall before delivery, accompanied by a severe deficiency of fibrinogen. This condition can lead to significant maternal and fetal risks due to impaired blood clotting, hemorrhage, and reduced placental function.

Causes

The exact cause is often unclear, but it may result from trauma, hypertension, or uterine abnormalities. The afibrinogenemia typically arises from the release of placental tissue into the maternal circulation, triggering abnormal clotting processes and depleting fibrinogen levels.

Risk Factors

• Hypertensive disorders of pregnancy (e.g., preeclampsia).
• Trauma to the abdomen.
• Uterine abnormalities or prior uterine surgery.
• Advanced maternal age.
• Smoking or substance use during pregnancy.
• History of placental abruption.

Symptoms

• Sudden, severe abdominal pain.
• Vaginal bleeding (may be absent in some cases).
• Uterine tenderness or rigidity.
• Fetal distress (e.g., decreased movement, abnormal heart rate).
• Signs of shock (e.g., dizziness, rapid pulse).

Diagnosis

Diagnosis is based on clinical presentation, ultrasound imaging to assess placental separation, and laboratory tests to evaluate coagulation status (e.g., fibrinogen levels, clotting times). The second trimester timing is confirmed by gestational age assessment.

Treatment Options

Management depends on maternal and fetal stability. Stable cases may involve close monitoring, while unstable cases require emergency delivery. Fibrinogen replacement therapy may be used to address coagulation defects. Supportive care includes blood transfusions and managing shock.

Prognosis and Follow-Up

Prognosis varies based on severity, gestational age, and promptness of care. Close follow-up is essential to monitor for recurrent abruption or complications in future pregnancies. Fetal outcomes depend on the extent of placental separation and gestational age at delivery.

Complications

• Severe maternal hemorrhage.
• Fetal hypoxia or death.
• Disseminated intravascular coagulation (DIC).
• Uterine atony or hysterectomy.
• Preterm birth-related complications.

Lifestyle & Prevention

• Manage chronic conditions like hypertension.
• Avoid abdominal trauma.
• Cease smoking or substance use during pregnancy.
• Attend regular prenatal care for early detection of risk factors.

When to Seek Professional Help

Seek immediate medical attention for sudden abdominal pain, vaginal bleeding, or signs of shock during pregnancy. Prompt evaluation is critical to assess placental separation and coagulation status.

Tips for Medical Coders

Document the second trimester gestational age and afibrinogenemia to support code O45.012. Include clinical details confirming placental separation and coagulation testing results. Ensure timing aligns with the second trimester (13–26 weeks) for accurate coding.