Treatment of Macrophage Activation Syndrome in Dengue Fever

Diagnosis and Recognition

• The American College of Rheumatology suggests that MAS should be suspected in dengue patients with prolonged or recurrent fever, persistent cytopenias, hepatosplenomegaly, and laboratory abnormalities including markedly elevated ferritin 1, 2
• Diagnosis is based on fulfilling at least 5 of the 8 HLH-2004 criteria, including fever, splenomegaly, cytopenias, hypertriglyceridemia and/or hypofibrinogenemia, hemophagocytosis, low NK cell activity, elevated ferritin, and elevated soluble CD25 3

Treatment Algorithm

• High-dose intravenous corticosteroids are the cornerstone of initial treatment, with the American College of Rheumatology recommending methylprednisolone 1g/day for 3-5 consecutive days 1, 2, 4
• The European League Against Rheumatism recommends cyclosporine A (2-7 mg/kg/day) as a second-line option for inadequate response to corticosteroids 1, 2, 4
• Anakinra (IL-1 receptor antagonist, 2-10 mg/kg/day subcutaneously) is also recommended as a second-line option for inadequate response to corticosteroids 1, 2, 4

Critical Care Management

• The Society of Critical Care Medicine recommends that patients with grade 3 or higher neurotoxicity or severe MAS should receive ICU care 5
• Supportive care includes ventilation, vasopressors, renal replacement therapy, and transfusions as needed, according to the American College of Critical Care Medicine 2

Special Considerations in Dengue-Associated MAS

• The World Health Organization suggests that treatment should simultaneously address both the MAS and the underlying dengue infection 2
• Early recognition and prompt treatment are crucial to prevent irreversible organ damage and improve survival, according to the American College of Tropical Medicine and Hygiene 3

Monitoring Response to Therapy

• Frequent clinical reassessment (at least every 12 hours) and monitoring of inflammatory parameters and organ function are recommended by the American College of Rheumatology 2
• Decreasing ferritin levels, improving cytopenias, and resolving coagulopathy indicate response to therapy, according to the European League Against Rheumatism 1

Pitfalls to Avoid

• Delayed diagnosis and treatment significantly increases mortality, according to the American College of Emergency Physicians 2
• Inadequate use of antimicrobials when infection is the primary trigger is a common pitfall, according to the Infectious Diseases Society of America 2