Understanding Cold Agglutinin Disease: Symptoms, Causes, and Treatment Options

Cold agglutinin disease (CAD) is a rare form of autoimmune hemolytic anemia (AIHA) that affects about 1 in 300,000 people. It occurs when the body's immune system mistakenly attacks and destroys red blood cells, leading to anemia and other symptoms. CAD is more common in people over 60, and women are more likely to develop the condition than men.

What Causes Cold Agglutinin Disease?

In most cases, the exact cause of CAD is unknown (idiopathic). However, certain conditions can trigger the development of CAD, including:

• Lymphoma, especially in people over 60

• Bacterial infections, such as E. coli, M. pneumoniae (atypical pneumonia), syphilis, or Legionnaires disease

• Viral infections, like the flu, hepatitis C, or Epstein Barr (mononucleosis)

• Parasitic infections, such as malaria

• Other autoimmune disorders

• Blood cell cancers, like multiple myeloma or leukemia

• COVID-19

Symptoms of Cold Agglutinin Disease

The most common symptoms of CAD include:

• Weakness and fatigue

• Dizziness and headaches

• Sore back, legs, or joints

• Irritability or changes in behavior

• Pale or yellow skin

• Cold feet or hands

• Chest pains

• Dark purple-to-gray discoloration of the skin in the fingertips, toes, nose or ears

• Numbness or pain in the extremities

• Small ulcers on the extremities

• Dark urine

• Blood clots

Some people with CAD may also experience Raynaud's phenomenon, which causes a cold, numb feeling and loss of color in the fingers or toes. Symptoms tend to worsen in colder temperatures.

Diagnosing Cold Agglutinin Disease

If your doctor suspects you have CAD, they will order blood tests to confirm the diagnosis. A complete blood count (CBC) can reveal signs of anemia, such as lower numbers of red blood cells and a larger-than-normal number of new red blood cells. Other tests can confirm the presence of hemolysis. A direct antiglobulin test (Coombs test) can detect higher-than-normal levels of cold agglutinins, the antibodies responsible for destroying red blood cells.

Treatment Options for Cold Agglutinin Disease

Treatment for CAD depends on the severity of symptoms and whether the condition is primary or secondary to another illness. If an underlying condition is causing CAD, treating that condition may help alleviate symptoms.

For mild cases, avoiding cold temperatures and staying warm may be sufficient. In more severe cases, treatment options include:

• Plasmapheresis: A procedure that filters the blood to remove cold agglutinins

• Blood transfusions: To temporarily increase red blood cell count

• Sutimlimab-jome (Enjaymo): The only FDA-approved medication specifically for CAD, which inhibits the destruction of red blood cells

• Rituximab: A drug that targets certain immune cells, originally developed for treating lymphoma

• Bortezomib: A medication used to treat multiple myeloma, which may be prescribed if other treatments are ineffective

Living with Cold Agglutinin Disease

If you have CAD, it's essential to stay warm and avoid cold temperatures. This may involve wearing extra clothing, using comfortable undergarments, and staying away from cold foods and drinks. Remember, you're not alone in this journey. Support organizations and online communities can provide valuable information and connect you with others who understand what you're going through.

To learn more about cold agglutinin disease, visit the following resources:

• National Organization for Rare Disorders (NORD) - Cold Agglutinin Disease

• Mayo Clinic - Cold Agglutinin Disease

• Aplastic Anemia and MDS International Foundation - Cold Agglutinin Disease