Treatments for Adult Still's Disease

Treatments for Adult Still's Disease

Drugs used to treat Adult Still's Disease

 

Ilaris

etanercept

canakinumab

tocilizumab

anakinra

 

What is Adult Still's Disease?

 

Adult Still's Disease (ASD) is a rare inflammatory disorder characterized by systemic inflammation, joint pain, fever, and a distinctive rash. It can be challenging to diagnose due to its nonspecific symptoms and overlaps with other conditions. ASD shares similarities with juvenile idiopathic arthritis but occurs in adults, typically between the ages of 16 and 35. While the exact cause of ASD remains unknown, it is considered an autoinflammatory disease, meaning it involves dysregulation of the innate immune system, leading to inflammation without a clear external cause.

 

Key Features and Symptoms

 

1. High, Spiking Fever:

   - Patients experience high fevers (above 39°C or 102°F) that often occur once or twice daily, typically in the late afternoon or evening.

   - The fever may spike and return to normal within hours, a pattern that is almost diagnostic of ASD.

 

2. Evanescent Salmon-Colored Rash:

   - A transient, salmon-pink rash appears on the trunk, arms, and legs and is often associated with fever spikes.

   - This rash may disappear and reappear, particularly when the person has a fever or exercises.

 

3. Joint Pain and Arthritis:

   - Joint pain (arthralgia) and inflammation (arthritis) are common and may affect multiple joints, especially the wrists, knees, and ankles.

   - Chronic arthritis can lead to joint damage over time.

 

4. Muscle Pain (Myalgia):

   - Widespread muscle pain can accompany the joint symptoms, especially during fever episodes.

 

5. Other Symptoms:

   - Sore throat, lymphadenopathy (enlarged lymph nodes), hepatomegaly (enlarged liver), splenomegaly (enlarged spleen), and pleuritis (inflammation around the lungs) may also occur.

 

Causes and Risk Factors

The cause of Adult Still's Disease remains unknown, though genetic, environmental, and immune factors likely contribute. Some triggers may include infections or stress, which can activate the immune system abnormally in genetically predisposed individuals.

 

Pathophysiology

ASD involves dysregulation of the immune system, specifically with pro-inflammatory cytokines like interleukin-1 (IL-1), IL-6, and IL-18. These cytokines play a role in triggering the inflammatory response in the body, causing the characteristic symptoms of fever, rash, and joint pain. The autoinflammatory nature of ASD suggests that the disease results from an internal immune system reaction rather than an autoimmune process, where the body attacks specific tissues.

 

Diagnosis

ASD is often diagnosed by excluding other diseases since its symptoms overlap with other conditions, such as infections, malignancies, or autoimmune diseases. The Yamaguchi Criteria are frequently used, requiring a combination of major and minor criteria. Key diagnostic steps include:

 

- Blood Tests:

  - Elevated levels of inflammatory markers like C-reactive protein (CRP), erythrocyte sedimentation rate (ESR), ferritin, and liver enzymes.

  - High ferritin (an iron-storage protein) is especially notable and may be 5 to 10 times higher than normal.

  - Leukocytosis (high white blood cell count) with neutrophilia (increased neutrophils) is common.

 

- Imaging:

  - X-rays or MRIs of affected joints to assess inflammation and damage.

 

- Yamaguchi Criteria:

  - The major criteria include fever, arthritis, typical rash, and leukocytosis.

  - The minor criteria include sore throat, lymphadenopathy, liver enlargement, or abnormal liver tests.

 

Treatment Options

 

1. Non-Steroidal Anti-Inflammatory Drugs (NSAIDs):

   - For mild cases, NSAIDs may help reduce fever, inflammation, and pain.

 

2. Corticosteroids:

   - Prednisone or other corticosteroids are often prescribed for moderate to severe cases to control inflammation. Long-term use may be required, though they have side effects like weight gain, osteoporosis, and increased infection risk.

 

3. Disease-Modifying Anti-Rheumatic Drugs (DMARDs):

   - Methotrexate, hydroxychloroquine, and azathioprine may be prescribed to reduce inflammation and prevent joint damage.

 

4. Biologic Agents:

   - IL-1 inhibitors (like anakinra), IL-6 inhibitors (like tocilizumab), and TNF inhibitors can target specific immune responses.

   - These are often used for patients who do not respond to conventional treatments.

 

5. Physical Therapy:

   - Exercise and physical therapy help maintain joint function, improve mobility, and reduce stiffness.

 

Prognosis and Complications

The course of ASD varies widely:

- Monocyclic (one-time occurrence): About one-third of patients may experience ASD only once, followed by remission.

- Polycyclic (relapsing-remitting): Some patients have recurring episodes with periods of remission in between.

- Chronic: A chronic form can cause ongoing symptoms and may lead to joint damage.

 

Complications may include macrophage activation syndrome (MAS), a severe condition where the immune system becomes hyperactive, leading to organ damage, anemia, and clotting abnormalities.

 

Monitoring and Follow-Up

ASD patients should have regular follow-up to monitor inflammation levels, organ function, and joint health.