Influenza A H1N1 Triggering Complement-Mediated Hemolytic Uremic Syndrome.

Area of Science:

• Nephrology
• Hematology
• Immunology

Background:

• Complement-mediated hemolytic uremic syndrome (CM-HUS) is a severe condition involving hemolytic anemia, thrombocytopenia, and kidney damage, often linked to complement system dysregulation.
• While CM-HUS is known, adult cases triggered by influenza infection are rare, particularly in immunocompromised individuals.

Observation:

• A 56-year-old female with multiple myeloma undergoing cancer treatment developed CM-HUS following Influenza A H1N1 infection.
• The patient presented with classic symptoms of CM-HUS, including anemia, low platelet count, and impaired kidney function.

Findings:

• Treatment with anti-complement therapy led to complete resolution of renal dysfunction and hemolytic anemia within one month.
• This case demonstrates a successful therapeutic outcome using anti-complement agents in influenza-triggered CM-HUS.

Implications:

• Influenza infection should be considered a potential trigger for CM-HUS in immunocompromised adult patients, especially those with hematologic malignancies.
• Anti-complement therapies represent a viable and effective treatment strategy for managing CM-HUS, even in complex patient populations.