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Cold Agglutinin – Definition, Causes and Treatment
Cold agglutinins are antibodies that cause red blood cells to clump together at low temperatures and can lead to a form of hemolytic anemia.
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Cold agglutinins are antibodies that cause red blood cells to clump together at low temperatures and can lead to a form of hemolytic anemia.
What Is a Cold Agglutinin?
Cold agglutinins are special IgM-type antibodies that bind to the surface of red blood cells (erythrocytes) at temperatures below body temperature – typically below 37 °C (98.6 °F) – and cause them to clump together (agglutinate). This process can lead to the destruction of red blood cells, resulting in a condition known as cold agglutinin disease (CAD), a type of autoimmune hemolytic anemia.
Causes
Cold agglutinins can arise as a primary (idiopathic) condition or secondarily due to an underlying disease:
- Primary CAD: Often associated with a clonal B-cell disorder of the bone marrow, in which abnormal plasma cells overproduce IgM antibodies.
- Secondary CAD: Triggered by infections (e.g., Mycoplasma pneumoniae, Epstein-Barr virus), lymphomas, chronic lymphocytic leukemia, or other autoimmune conditions.
- Acute transient form: Commonly occurs following infections, especially in children, and typically resolves on its own.
Symptoms
Symptoms are mainly triggered by cold exposure and can vary considerably in severity:
- Pallor, fatigue, and weakness caused by anemia
- Acrocyanosis: Bluish discoloration of the fingers, toes, nose, and ears due to impaired circulation in the cold
- Yellowing of the skin and eyes (jaundice) due to increased breakdown of red blood cells
- Dark-colored urine (hemoglobinuria)
- Dizziness, rapid heartbeat, and shortness of breath in severe anemia
Diagnosis
Diagnosis is established through a combination of clinical examination and laboratory tests:
- Complete blood count: Reveals anemia with elevated mean corpuscular volume (MCV) due to cell clumping
- Direct Coombs test (DAT): Positive for complement protein C3d, not for IgG
- Cold agglutinin titer: Elevated titers (usually above 1:64 at 4 °C) confirm the diagnosis
- LDH and bilirubin: Elevated as signs of hemolysis
- Haptoglobin: Decreased during active hemolysis
- Bone marrow examination and imaging may be performed to rule out underlying malignancies
Treatment
General Measures
The most important initial step is consistent avoidance of cold exposure. Many patients with mild disease do not require pharmacological treatment.
Pharmacological Therapy
- Rituximab: A monoclonal anti-CD20 antibody that depletes B cells and reduces antibody production – currently the first-line treatment for patients with CAD requiring therapy.
- Rituximab plus bendamustine: A combination regimen with improved response rates in primary CAD.
- Sutimlimab: A recently approved complement inhibitor (anti-C1s) specifically developed for CAD that blocks complement-mediated hemolysis.
- Corticosteroids and plasmapheresis are reserved for acute emergency situations, as their long-term benefit is limited.
Treatment of the Underlying Condition
In secondary CAD, treating the underlying cause – such as an infection or lymphoma – is the primary therapeutic goal.
References
- Berentsen S. et al. - Cold agglutinin disease: Current challenges and future prospects. Journal of Blood Medicine, 2020; 11: 93–107.
- Swiecicki P.L. et al. - Cold agglutinin disease. Blood, 2013; 122(7): 1114–1121.
- Brodsky R.A. - Warm autoimmune hemolytic anemia and cold agglutinin disease. Harrison's Principles of Internal Medicine, 21st edition, McGraw-Hill, 2022.
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