O88.013 Air embolism in pregnancy, third trimester

Name of the Condition

• Air embolism in pregnancy, third trimester

Summary

Air embolism in pregnancy, third trimester is a rare but life-threatening complication where air enters the maternal venous circulation during the third trimester of pregnancy. It can lead to rapid cardiovascular and respiratory collapse, requiring immediate recognition and intervention.

Causes

Air embolism in the third trimester typically occurs when air is introduced into the venous system, often during procedures such as cesarean delivery, manual removal of the placenta, or uterine manipulation. It may also result from trauma to the uterus or pelvic veins, allowing air to enter the circulation.

Risk Factors

• Cesarean delivery or other uterine surgery.
• Manual removal of the placenta.
• Uterine trauma or rupture.
• Use of positive-pressure ventilation during labor.
• Supine positioning during delivery (e.g., in the third trimester).

Symptoms

• Sudden onset of dyspnea, chest pain, or respiratory distress.
• Hypotension, tachycardia, or cardiovascular collapse.
• Neurological symptoms (e.g., seizures, confusion, loss of consciousness).
• Cyanosis or altered mental status.
• Possible "mill wheel" murmur on auscultation.

Diagnosis

Diagnosis is based on clinical suspicion, especially in the context of procedures that risk air entry, combined with imaging (e.g., echocardiography to detect air in the heart chambers) or detection of air in the pulmonary arteries. Laboratory tests may show hypoxemia or metabolic acidosis.

Treatment Options

Treatment focuses on immediate supportive care, including oxygen therapy, fluid resuscitation, and positioning the patient in left lateral decubitus or Trendelenburg position to prevent further air entry. Advanced interventions may include hyperbaric oxygen therapy or cardiopulmonary resuscitation if cardiac arrest occurs.

Prognosis and Follow-Up

Prognosis depends on the volume of air embolized and the speed of intervention. Early recognition and treatment improve outcomes, but severe cases can result in permanent neurological damage or death. Follow-up includes monitoring for complications and assessing maternal and fetal well-being.

Complications

• Cardiovascular collapse or cardiac arrest.
• Neurological deficits (e.g., stroke, seizures).
• Respiratory failure.
• Fetal distress or loss.

Lifestyle & Prevention

Preventive measures include avoiding procedures that risk air entry, using proper techniques during uterine manipulation, and ensuring adequate hydration. Patients should be positioned carefully during labor to minimize venous pressure changes.

When to Seek Professional Help

Seek immediate medical attention if symptoms such as sudden dyspnea, chest pain, or altered mental status occur, especially after uterine procedures or trauma.

Tips for Medical Coders

Code O88.013 is specific to air embolism occurring in the third trimester of pregnancy. Documentation should specify the trimester and confirm the presence of air embolism. Ensure the diagnosis aligns with clinical findings and procedural history to support accurate coding.