Clinical Scenario:
A 12-year-old boy presents with high-grade fever, purpuric rash, seizures, and altered consciousness. Cerebrospinal fluid (CSF) examination confirms the diagnosis of meningitis. Forty-eight hours after admission, he develops severe shock. Despite aggressive intravenous fluid resuscitation and inotropic support, the shock remains refractory. Laboratory investigations show:
| Investigation | Result |
|---|---|
| Serum sodium | 128 mmol/L |
| Serum potassium | 6.5 mmol/L |
What is the most likely complication that has developed in this patient?
A. Septic shock
B. Neurogenic shock
C. Intracranial hemorrhage
D. Hyponatremic dehydration
E. Waterhouse–Friderichsen syndrome
Correct answer & Explanation:
Answer: E. Waterhouse–Friderichsen syndrome
Explanation: Waterhouse-Friderichsen syndrome
This child most likely has meningococcal meningitis with meningococcemia, complicated by Waterhouse–Friderichsen syndrome, which is characterized by massive bilateral adrenal hemorrhage leading to acute adrenal insufficiency. The presence of a purpuric rash, refractory shock, hyponatremia, and hyperkalemia strongly suggests adrenal failure. Patients may rapidly progress to circulatory collapse, disseminated intravascular coagulation (DIC), coma, and death if not promptly recognized and treated.
Why not the other options?
- A. Septic shock: Although septic shock can occur in severe meningococcal infection, the combination of refractory shock, hyponatremia, and hyperkalemia is more characteristic of acute adrenal insufficiency due to Waterhouse–Friderichsen syndrome.
- B. Neurogenic shock: Typically results from spinal cord injury causing loss of sympathetic tone and is not associated with hyperkalemia or adrenal failure.
- C. Intracranial hemorrhage: May cause neurological deterioration and hemodynamic instability, but it does not explain the electrolyte abnormalities suggestive of adrenal insufficiency.
- D. Hyponatremic dehydration: Can cause shock and low sodium levels, but it does not account for the marked hyperkalemia and persistent inotrope-resistant shock seen in this patient.
Clinical Pearl:
In a child with meningococcemia, purpuric rash, refractory shock, hyponatremia, and hyperkalemia, always suspect Waterhouse–Friderichsen syndrome (acute adrenal hemorrhage causing adrenal crisis).
