Acute paroxysmal cold hemoglobinuria upon dengue fever: A case report

Abstract

Rationale: Dengue fever is capable of inciting the formation of transient polyclonal antibodies directed at red blood cell antigens, resulting in complement-mediated hemolysis, leading to intravascular hemolysis and hemoglobinuria. Patient’s concern: A 12-year-old male patient who recovered from dengue fever a week ago had red blood cell agglutination, spherocytes, and engulfment of red blood cells (erythrophagocytosis) by monocytes and neutrophils on routine hematological peripheral blood smear. The unexpected blood smear results prompted the lab physicians to investigate autoimmune hemolytic anemia, which revealed a monospecific positive direct antiglobulin test for complement (C3d, C3b) and the presence of Donath-Landsteiner antibody. Diagnosis: Paroxysmal cold hemoglobinuria (PCH), secondary to dengue fever. Interventions: Oxygen supplements, antibiotics, intravenous immunoglobulins, steroid therapy, and packed cell transfusions were administered. Outcomes: The patient’s condition was improved following the therapy. Lessons: Post-dengue PCH is a rare complication that requires a thorough peripheral smear examination for erythrophagocytosis, as advanced hematology analyzers fail to detect such findings.

Keywords

Paroxysmal cold hemoglobinuria / Dengue / Erythrophagocytosis / Donath-Landsteiner test / Treatment

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