Rare Complication of IVF When Pleural Effusion Signals Ovarian Hyperstimulation Syndrome

Unusual Case Breathing Trouble Unmasks OHSS

A 44-year-old woman presented with chest discomfort, cough, and breathing difficulty just 10 days after embryo transfer. Notably, this was her fourth IVF cycle each previously complicated by OHSS. However, this time, the absence of abdominal ascites initially puzzled clinicians.

Key findings:

  • Ultrasound and X-ray revealed a right-sided pleural effusion.
  • Laboratory results: Normal CBC and kidney function; decreased serum albumin.
  • Pleural fluid analysis: High protein (exudate), with reactive cells but no infection.

A chest drain removed 2150 ml of fluid over 3 days, resolving symptoms. She later delivered a healthy baby via cesarean section.

Medical Perspective: Why This Matters

OHSS typically involves ovarian enlargement and fluid buildup in the abdomen. However, unilateral pleural effusion without ascites is extremely rare—reported in less than 1% of OHSS cases.

  • How does this happen?
    • Leakage of fluid from the abdomen to the chest via microscopic defects in the diaphragm or lymphatic channels.
    • Right-side effusions are more common due to anatomical reasons.

Risk Factors & Prevention

Understanding who is at risk is essential. Common OHSS risk factors include:

  • Polycystic ovarian syndrome (PCOS)
  • High antral follicle count and AMH levels
  • Prior history of OHSS

Preventive strategies:

  • Use of GnRH agonists over HCG
  • Freeze-all embryo policies
  • Minimal stimulation IVF protocols

Recent studies advocate for in vitro maturation and personalized stimulation regimens to mitigate OHSS without significantly reducing success rates.

Clinical Implications & Future Outlook

This case reinforces the need for vigilance. Even in the absence of typical symptoms like abdominal bloating, clinicians must consider OHSS in post IVF patients with unexplained respiratory issues.

  • Encourage early imaging when respiratory symptoms occur post embryo transfer.
  • Develop and adopt institutional protocols for OHSS risk assessment.
  • Educate patients about the risks and options for safer IVF practices.

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