Understanding Vasculitis
Vasculitis is a group of autoimmune disorders characterized by inflammation of the blood vessels. The term "vasculitis" literally means inflammation of the vessels, and it can affect arteries, veins, and capillaries of any size throughout the body. When blood vessels become inflamed, they can thicken, weaken, narrow, or scar, disrupting normal blood flow. This can damage the organs and tissues supplied by the affected vessels, leading to a wide range of symptoms depending on which vessels and organs are involved. Vasculitis can be a primary condition, occurring on its own, or secondary, developing as a result of another disease, infection, or medication reaction. There are many different types of vasculitis, classified by the size of blood vessels affected and the specific pattern of disease. With early diagnosis and appropriate treatment, many forms of vasculitis can be controlled, preventing serious organ damage and allowing people to live full, active lives.
What Happens in Vasculitis?
In vasculitis, the immune system mistakenly attacks blood vessel walls, causing inflammation. This inflammation damages the vessel walls, leading to several potential problems. Vessels may narrow (stenosis), reducing blood flow to organs and tissues. Vessels may weaken and stretch, forming bulges called aneurysms that can rupture. Vessels may become scarred and thickened, further restricting blood flow. Blood clots may form in inflamed vessels, blocking blood flow completely. The reduced blood flow can deprive tissues and organs of oxygen and nutrients, causing damage or organ failure. The exact cause of most types of vasculitis is unknown, but it likely involves a combination of genetic predisposition, immune system dysfunction, and environmental triggers such as infections, medications, or exposure to certain chemicals or toxins.
Types of Vasculitis
Vasculitis is classified based on the size of the blood vessels primarily affected:
Large Vessel Vasculitis: Giant cell arteritis (temporal arteritis) affects large and medium arteries, particularly those in the head, and can cause vision loss if untreated. Takayasu arteritis affects the aorta and its major branches, most commonly in young women.
Medium Vessel Vasculitis: Polyarteritis nodosa affects medium-sized arteries throughout the body, sparing the lungs. Kawasaki disease primarily affects children and involves medium-sized arteries, particularly coronary arteries supplying the heart.
Small Vessel Vasculitis: Granulomatosis with polyangiitis (formerly Wegener's granulomatosis) affects small and medium vessels, particularly in the respiratory tract and kidneys. Microscopic polyangiitis affects small vessels, particularly in the kidneys and lungs. Eosinophilic granulomatosis with polyangiitis (formerly Churg-Strauss syndrome) affects small and medium vessels and is associated with asthma and high eosinophil counts. Henoch-Schönlein purpura (IgA vasculitis) primarily affects children and involves small vessels in the skin, joints, intestines, and kidneys.
Variable Vessel Vasculitis: Behçet's disease can affect vessels of any size and causes recurrent mouth sores, genital sores, and eye inflammation. Cogan syndrome affects the eyes and inner ears.
Who Gets Vasculitis?
Vasculitis can affect people of all ages, genders, and ethnic backgrounds, though certain types have specific demographic patterns. Some forms, like Kawasaki disease and Henoch-Schönlein purpura, primarily affect children. Others, like giant cell arteritis, typically affect adults over age 50. Takayasu arteritis most commonly affects young women, particularly those of Asian descent. Some types of vasculitis are more common in certain ethnic groups. People with other autoimmune diseases, chronic infections (such as hepatitis B or C), or certain genetic factors may have increased risk. Smoking increases the risk of some types of vasculitis and can worsen disease severity.
Common Symptoms
Vasculitis symptoms vary widely depending on which blood vessels and organs are affected. Some people experience only mild symptoms, while others develop severe, life-threatening complications. Common symptoms include:
General Symptoms: Fever, often without an obvious cause. Fatigue and weakness. Weight loss and loss of appetite. Night sweats. General feeling of being unwell (malaise). Muscle and joint aches.
Skin Symptoms: Purple or red spots (purpura) on the skin, particularly on the legs. Hives, rashes, or itching. Lumps or nodules under the skin. Open sores or ulcers. Livedo reticularis (a mottled, lacy pattern on the skin).
Organ-Specific Symptoms: Kidneys: Blood in urine, protein in urine, decreased kidney function, high blood pressure. Lungs: Shortness of breath, cough, coughing up blood, chest pain. Nervous system: Headaches, stroke, seizures, numbness, tingling, weakness, vision changes, confusion. Eyes: Redness, pain, vision loss, double vision. Ears: Hearing loss, ringing in the ears, dizziness. Heart: Chest pain, heart attack, heart failure, irregular heartbeat. Gastrointestinal: Abdominal pain, bloody stools, nausea, vomiting, intestinal perforation. Sinuses and upper respiratory tract: Chronic sinusitis, nosebleeds, nasal congestion, collapsed nasal bridge.
Complications: If left untreated, vasculitis can cause permanent organ damage, organ failure, aneurysms and rupture of blood vessels, stroke, heart attack, kidney failure, vision loss or blindness, and increased risk of infections due to immunosuppressive treatments.
Diagnosing Vasculitis
Diagnosing vasculitis can be challenging because symptoms vary widely and can mimic other conditions. Diagnosis involves a combination of clinical evaluation, laboratory tests, imaging, and often tissue biopsy. A healthcare provider will review symptoms, conduct a physical examination, and assess which organs may be affected. Blood tests check inflammatory markers including erythrocyte sedimentation rate (ESR) and C-reactive protein (CRP), which are often elevated. Complete blood count may show anemia or elevated white blood cells. Kidney and liver function tests assess organ damage. Antineutrophil cytoplasmic antibodies (ANCA) are associated with certain types of small vessel vasculitis. Other autoantibodies may be tested depending on suspected type. Urinalysis detects blood or protein in urine, indicating kidney involvement. Imaging studies including X-rays, CT scans, MRI, ultrasound, and angiography visualize blood vessels and detect narrowing, blockages, aneurysms, or organ damage. Biopsy of affected tissue or organ (such as skin, kidney, lung, or artery) confirms inflammation of blood vessels and helps determine the specific type of vasculitis.
Treatment Options
Treatment for vasculitis depends on the type, severity, and organs affected. The goals are to stop inflammation, prevent organ damage, achieve remission, and prevent relapses. Treatment typically involves immunosuppressive medications to control the autoimmune attack.
Corticosteroids: High-dose prednisone or methylprednisolone is often the first-line treatment to rapidly reduce inflammation. For severe cases, intravenous corticosteroids may be used initially. Once inflammation is controlled, the dose is gradually reduced to the lowest effective level.
Immunosuppressive Medications: Cyclophosphamide is a powerful immunosuppressant used for severe vasculitis affecting vital organs. Azathioprine or methotrexate may be used for maintenance therapy after initial treatment or for less severe disease. Mycophenolate mofetil is an alternative immunosuppressant for some types of vasculitis.
Biologic Therapies: Rituximab targets B cells and is effective for certain types of vasculitis, particularly ANCA-associated vasculitis. Tocilizumab blocks interleukin-6 and is approved for giant cell arteritis. Other biologics may be used for specific types of vasculitis.
Other Medications: Aspirin or other antiplatelet agents may be used to prevent blood clots. Blood pressure medications and cholesterol-lowering drugs help manage cardiovascular risk. Pain relievers for symptom management.
Plasma Exchange (Plasmapheresis): May be used in severe cases to remove harmful antibodies from the blood.
Surgery: May be necessary to repair damaged blood vessels, remove aneurysms, or restore blood flow to organs.
Lifestyle Modifications: Quit smoking to improve blood vessel health and treatment response. Eat a balanced, anti-inflammatory diet. Exercise regularly as tolerated to maintain overall health. Manage stress through relaxation techniques or counseling. Get adequate rest and sleep. Protect skin from sun exposure, especially when taking immunosuppressive medications.
Living with Vasculitis
Vasculitis is often a chronic condition that requires ongoing management and monitoring. With early diagnosis and appropriate treatment, many people achieve remission and maintain good organ function. Some forms of vasculitis are self-limited and resolve with treatment, while others are chronic and require long-term immunosuppression. The prognosis varies widely depending on the type of vasculitis, severity, organs affected, and response to treatment. Regular follow-up with a rheumatologist or other specialists is essential to monitor disease activity, adjust medications, assess for organ damage, and detect relapses early. Adherence to prescribed medications is crucial, even during remission, as stopping treatment prematurely can lead to disease flares and organ damage. Regular blood tests, urine tests, and imaging studies help monitor disease and treatment side effects. Staying informed about your specific type of vasculitis, recognizing warning signs of flares, maintaining open communication with your healthcare team, and seeking support from family, friends, and support groups can help you successfully manage both the physical and emotional aspects of living with vasculitis.