Symptoms of Ovarian Hyperstimulation Syndrome
Ovarian hyperstimulation syndrome presents with a spectrum of symptoms ranging from mild abdominal discomfort to life-threatening complications, characterized primarily by capillary leak syndrome causing fluid shifts into third spaces.
Clinical Presentation by Severity
Mild to Moderate Symptoms
The most common presenting symptoms include 1:
- Abdominal pain and distention
- Bloating
- Nausea and vomiting
- Abdominal fullness
- Early satiety
- Dyspepsia
Severe Manifestations
As the syndrome progresses, patients develop signs of capillary leak syndrome 2, 3, 4:
Fluid accumulation:
- Ascites (often large-volume)
- Pleural effusion leading to dyspnea and tachypnea
- Pericardial effusion (less common)
Hemodynamic changes:
- Hypovolemia despite third-space fluid accumulation
- Tachycardia
- Hypotension
- Oliguria or anuria
Laboratory derangements:
- Hemoconcentration (elevated hematocrit)
- Hyponatremia
- Hyperkalemia
- Electrolyte imbalances
Critical/Life-Threatening Complications
The most severe cases can present with 2, 4, 5:
- Thromboembolic events (arterial or venous)
- Ischemic stroke
- Limb ischemia and compartment syndrome
- Deep vein thrombosis
- Respiratory failure (adult respiratory distress syndrome)
- Renal failure
- Hemorrhage from ruptured ovary
- Hemodynamic instability
Key Diagnostic Features
Physical examination findings:
- Massive ovarian enlargement (palpable on examination)
- Abdominal distention from ascites
- Respiratory distress if pleural effusions present
- Signs of dehydration despite fluid overload in third spaces
- Bilaterally enlarged ovaries with multiple cysts
- Ascites
- Pleural effusion (unilateral or bilateral)
Important Clinical Context
The syndrome typically occurs 1:
- As a complication of ovarian stimulation for assisted reproductive technology
- Rarely spontaneously (in molar pregnancies or FSH receptor mutations)
- Most commonly in young, otherwise healthy women
Critical pitfall: OHSS is an iatrogenic, potentially life-threatening condition that requires rapid recognition 2, 4. The hypercoagulable state can lead to devastating thromboembolic complications including stroke and limb ischemia, even in young patients. Early identification of symptoms—particularly the triad of abdominal pain, distention, and dyspnea—should prompt immediate evaluation.
The severity ranges from mild symptoms manageable as outpatient to critical cases requiring hospitalization and multidisciplinary intensive care 7. Any patient with respiratory symptoms, oliguria, or signs of thrombosis requires urgent intervention.