Hyperhemolysis Syndrome without Underlying Hematologic Disease.

Area of Science:

• Transfusion Medicine
• Hematology
• Immunology

Background:

• Hyperhemolysis is a rare, life-threatening hemolytic transfusion reaction.
• It is typically observed in patients with sickle cell disease.
• This phenomenon is uncommon in patients without hemoglobinopathies.

Purpose of the Study:

• To report a case of hyperhemolysis in a patient without hemoglobinopathy.
• To investigate the underlying mechanism of hyperhemolysis in this context.
• To highlight the potential for delayed hemolytic transfusion reactions (DHTR) to cause hyperhemolysis.

Main Methods:

• A case report of a 55-year-old male trauma patient requiring multiple red blood cell transfusions.
• Laboratory investigations including direct and indirect antiglobulin tests, antibody identification, and assessment of hemolysis markers.
• Clinical monitoring of hemoglobin and hematocrit levels following transfusions.

Main Results:

• The patient developed a positive direct antiglobulin test (DAT) for IgG and complement, and indirect antiglobulin test (IAT) for anti-Jka alloantibodies.
• The patient's red blood cells (RBCs) were Jka negative, while transfused blood contained the Jka antigen, consistent with DHTR.
• Subsequent transfusions precipitated further drops in hemoglobin and hematocrit, indicating hyperhemolysis, which resolved upon cessation of transfusions.

Conclusions:

• Hyperhemolysis can occur in the setting of a delayed hemolytic transfusion reaction (DHTR).
• This case demonstrates that hyperhemolysis is not exclusive to patients with hemoglobinopathies.
• Careful monitoring and management are crucial for patients experiencing severe hemolytic reactions post-transfusion.