Autoimmune hemolysis: mixed warm and cold antibody type

Area of Science:

• Hematology
• Immunology
• Internal Medicine

Background:

• Mixed autoimmune haemolysis presents a complex clinical and serological challenge.
• This condition combines features of both warm antibody autoimmune haemolysis and cold agglutinin syndrome.

Purpose of the Study:

• To describe the clinical and serological characteristics of 25 patients with mixed autoimmune haemolysis.
• To investigate the demographic, etiological, and management aspects of this rare disorder.

Main Methods:

• Analysis of patient data including clinical presentation, serological findings (direct antiglobulin test, antibody specificity), and treatment outcomes.
• Separation and characterization of IgG and IgM antibody components.

Main Results:

• All 25 patients exhibited positive direct antiglobulin tests with IgG and complement on red blood cells.
• Cold autoantibodies were active at 30°C or above, often with Ii system specificity; warm component specificity was less evident.
• Severe haemolysis was common, with idiopathic cases (44%) and secondary cases (associated with SLE or lymphoma) identified. The male:female ratio was 1:15.

Conclusions:

• Mixed autoimmune haemolysis is a distinct entity requiring careful serological evaluation.
• While often responsive to treatment, the chronic and relapsing nature of the condition poses management difficulties.
• Plasma exchange may serve as a valuable adjunctive therapy in managing severe cases.