Campylobacter Colitis as a Trigger for Atypical Hemolytic Uremic Syndrome: About One Case

Area of Science:

• Nephrology
• Hematology
• Genetics

Background:

• Hemolytic uremic syndrome (HUS) is a severe condition characterized by kidney failure, anemia, and low platelets.
• Typical HUS is often triggered by infections, but atypical forms can have genetic origins.
• Early diagnosis and targeted treatment are crucial for patient outcomes.

Observation:

• A 17-year-old male presented with acute renal failure, anemia, and severe thrombocytopenia following infectious diarrhea.
• Initial investigations for typical HUS, including ADAMTS13 activity and complement pathway analysis, were inconclusive.
• The patient's condition deteriorated, requiring renal replacement therapy and developing acute heart failure.

Findings:

• Stool cultures identified *Campylobacter coli*, but its direct role in pathogenesis was unclear.
• Genetic analysis revealed a mutation in the complement factor H gene.
• Eculizumab therapy led to rapid improvement in cardiac function and renal recovery, though dialysis was initially required.

Implications:

• This case highlights the importance of considering genetic causes, specifically complement pathway mutations, in atypical HUS presentations.
• Eculizumab is effective in managing severe HUS cases with complement factor H mutations.
• Long-term eculizumab treatment may be necessary for patients with complement factor H mutations to prevent disease recurrence.