A Primer on Vasculitis
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Clinical AND Health Affairs A Primer on Vasculitis BY KENNETH J. WARRINGTON, M.D., AND ERIC L. MATTESON, M.D., M.P.H. Vasculitides are rare but serious conditions involving inflammation of the body’s blood vessels that can lead to organ damage and myriad complications. This article describes the various forms of vasculitis and their incidence, and discusses diagnosis and treatment of patients with the more common forms. asculitis refers to a heterogenous occasionally, they can be limited to a single The incidence of ANCA-associated vascu- group of conditions characterized by organ. Cutaneous vasculitis, testicular vas- litis is approximately 10 to 20 persons per Vinflammation of blood vessel walls, culitis and primary central nervous system million per year, with granulomatosis with which results in vascular damage. Because vasculitis are examples of single-organ polyangiitis being more common than inflammation can affect vessels of any size vasculitides. Vasculitis may develop in the microscopic polyangiitis and eosinophilic in any location, vasculitides have varying context of an underlying autoimmune dis- granulomatosis with polyangiitis. clinical presentations. ease such as systemic lupus erythematosus Vasculitides are generally classified and rheumatoid arthritis as well as with Etiology based on the predominant type of vessel malignancy, infection or medication use. In the majority of cases, the cause of (large, medium or small) involved. Giant (Table).1 vasculitis is unknown. The prevailing cell arteritis and Takayasu’s arteritis are hypothesis is that vasculitis is initiated by both large-vessel vasculitides that affect Incidence an environmental agent in a genetically the aorta and its primary and second- In general, vasculitis is rare and therefore predisposed individual. Genetic polymor- ary branches. Polyarteritis nodosa and can be difficult to recognize clinically. The phisms in the human leukocyte antigen Kawasaki disease predominantly involve incidence of specific vasculitic disorders (HLA) genes and polymorphisms in genes medium-sized arteries. The most com- varies according to patient age, race and encoding cytokines and other immuno- mon forms of small-vessel vasculitis are geographic location. For example, giant regulatory proteins have been associated granulomatosis with polyangiitis (formerly cell arteritis affects people older than 50 with an increased risk of several types of Wegener’s granulomatosis), microscopic years of age and is most common among vasculitis.2 polyangiitis, and eosinophilic granuloma- people of Northern European descent. It In certain forms of vasculitis, investiga- tosis with polyangiitis (formerly Churg- is one of the most common forms of vas- tors have identified probable etiologies. Strauss syndrome). The latter three condi- culitis in adults, with an average annual About one-third of polyarteritis nodosa tions are often collectively referred to as incidence of about 19 cases per 100,000 cases are caused by chronic hepatitis B the anti-neutrophil cytoplasmic antibody persons 50 years of age and older. Con- infection, while hepatitis C can trigger (ANCA)-associated vasculitides. Other versely, Takayasu arteritis generally occurs cryoglobulinemic vasculitis. Neoplasms, less common forms of small-vessel vasculi- in individuals younger than 40 years of age particularly hematologic malignancies, can tis include cryoglobulinemic vasculitis and and is more common among Asians. In the also cause vasculitis. Drug-induced vas- Henoch-Schönlein purpura. Some forms United States, its annual incidence is about culitis can occur with medications such as of systemic vasculitis such as Behçet’s dis- 2.6 per million population. Polyarteritis antibiotics, hydralazine, propylthiouracil ease can affect vessels of any size and type nodosa affects about five to 10 individuals and allopurinol. (arteries, veins and capillaries). per million per year, and it is becoming Typically, vasculitides are systemic dis- even less common in countries with a de- eases with multi-organ involvement; but creasing prevalence of hepatitis B infection. 36 | MINNESOTA MEDICINE | MAY 2013 Clinical AND Health Affairs Complications and Clinical TABLE Manifestations 1 The clinical manifestations and complica- Nomenclature for Vasculitides tions of vasculitis are varied and depend Large-vessel vasculitis on the vascular bed that is involved by the • Takayasu arteritis inflammatory process: • Giant cell arteritis In giant cell arteritis, the lumen may • Medium-vessel vasculitis become occluded through intimal • Polyarteritis nodosa hyperplasia, causing end-organ isch- • Kawasaki disease emia. Since the extracranial arteries are Small-vessel vasculitis typically involved, patients often pres- • Antineutrophil cytoplasmic antibody (ANCA)–associated vasculitis ent with headaches and scalp tender- • Microscopic polyangiitis ness. Patients frequently complain of • Granulomatosis with polyangiitis (Wegener’s) symptoms of polymyalgia rheumatica • Eosinophilic granulomatosis with polyangiitis (Churg-Strauss) including pain and stiffness in the neck • Immune complex SVV • Anti–glomerular basement membrane disease and proximal extremities. The serious • Cryoglobulinemic vasculitis clinical consequences that may ensue • IgA vasculitis (Henoch-Schönlein) include jaw claudication, vision loss • Hypocomplementemic urticarial vasculitis (anti-C1q vasculitis) caused by ischemic optic neuropathy, Variable-vessel vasculitis cerebrovascular ischemic events and • Behçet’s disease limb claudication. In the aorta, damage • Cogan’s syndrome to the vessel wall may lead to progres- Single-organ vasculitis sive dilatation, aneurysm formation and • Cutaneous leukocytoclastic angiitis life-threatening events such as aortic • Cutaneous arteritis dissection.3 • Primary central nervous system vasculitis • The inflammatory vasculopathy in • Isolated aortitis Others Takayasu arteritis may lead to complica- • tions such as cerebrovascular events, Vasculitis associated with systemic disease limb claudication, renovascular hyper- • Lupus vasculitis Rheumatoid vasculitis tension and aneurysm formation. Less • • Sarcoid vasculitis often, it involves the coronary arteries, • Others causing ischemic heart disease and Vasculitis associated with probable etiology pulmonary hypertension. Patients often • Hepatitis C-associated cryoglobulinemic vasculitis require surgical revascularization to re- • Hepatitis B-associated vasculitis store vascular patency. • Syphilis-associated aortitis • Polyarteritis nodosa is characterized by • Drug-associated immune complex vasculitis necrotizing inflammation of muscular • ANCA-associated vasculitis arteries, which often produces microan- • Cancer-associated vasculitis Others eurysms of the visceral arteries. Patients • typically present with constitutional SOURCE symptoms and evidence of multi-organ dysfunction. Neurologic manifestations 1. Jennette JC, Falk RJ, Bacon PA, et al. 2012 revised International Chapel Hill Consensus Conference such as mononeuritis multiplex, cutane- Nomenclature of Vasculitides. Arthritis Rheum. 2013;65(1):1-11. ous lesions (eg, skin ulcerations) and gastrointestinal complications such as mesenteric ischemia, bowel infarction • Because the various forms of ANCA- • Clinical manifestations of granulo- or hemorrhage are characteristic. Renal associated vasculitis primarily involve matosis with polyangiitis may include involvement often leads to arterial hy- small vessels such as arterioles, venules sinusitis, otitis, pulmonary nodules pertension and ischemic nephropathy and capillaries, the main target organs and alveolar hemorrhage. The major- with renal failure. Peripheral arterial are the respiratory system and kidneys, ity of patients will develop glomeru- occlusions can result in ischemia and where extensive capillary networks are lonephritis, which can lead to rapidly gangrene of the digits.4 present. progressive renal failure. Other disease manifestations may include ocular MAY 2013 | MINNESOTA MEDICINE | 37 Clinical AND Health Affairs inflammation (scleritis, proptosis), Laboratory findings suggestive of vas- lung nodules, alveolar infiltrates/hemor- cutaneous vasculitis and mononeuritis culitis may include normocytic anemia, rhage, organ infarcts). Vascular imaging multiplex.5 thrombocytosis, and elevated erythrocyte such as magnetic resonance angiography • Rapidly progressive glomerulonephritis sedimentation rate (ESR) and C-reactive (MRA) or computed tomography angi- and alveolar hemorrhage are the most protein (CRP). Unfortunately, these tests ography (CTA) is particularly useful for common clinical manifestations of mi- are not specific and may be abnormal be- noninvasive imaging of medium-sized and croscopic polyangiitis, which clinically cause of myriad inflammatory, infectious large arteries. Vessel wall edema, contrast can be very similar to granulomatosis or neoplastic disease entities. Typically, enhancement and/or wall thickening are with polyangiitis.6 ESR and CRP are markedly elevated in characteristic findings of large-vessel • Eosinophilic granulomatosis with poly- vasculitis; however, not all patients with vasculitis. In addition, MRA or CTA may angiitis has three main disease features: vasculitis mount an inflammatory re- reveal luminal changes such as long ta- allergic rhinitis and asthma, eosino- sponse—especially those with single-organ pered arterial stenoses of the aortic arch philic infiltrative disease and systemic vasculitis. branches or aneurysms.9 Conventional small-vessel