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Polyarteritis Nodosa

  • Author: Dana Jacobs-Kosmin, MD, FACP; Chief Editor: Herbert S Diamond, MD  more...
 
Updated: Jan 12, 2016
 

Background

Classic polyarteritis nodosa (PAN or c-PAN) is a systemic vasculitis characterized by necrotizing inflammatory lesions that affect medium-sized and small muscular arteries, preferentially at vessel bifurcations, resulting in microaneurysm formation, aneurysmal rupture with hemorrhage, thrombosis, and, consequently, organ ischemia or infarction.

Kussmaul and Maier first described PAN in 1866. The autopsy of a patient with fever, weight loss, abdominal pain, and polyneuropathy revealed areas of focal inflammatory exudations that gave rise to palpable nodules along the course of medium-sized arteries.[1]

PAN, like other vasculitides, affects multiple systems and has protean manifestations, although it most commonly affects skin (see the image below), joints, peripheral nerves, the gut, and the kidney.[2] The lungs are usually spared with PAN. A typical PAN patient might present with fever, night sweats, weight loss, skin ulcerations or tender nodules, and severe muscle and joint pains developing over weeks or months. (See Etiology, Presentation, and Workup.)

Nonspecific, firm, tender subcutaneous nodules wit Nonspecific, firm, tender subcutaneous nodules without livedo reticularis and/or systemic involvement may be the first sign of polyarteritis nodosa (PAN).

See Cutaneous Clues to Accurately Diagnosing Rheumatologic Disease, a Critical Images slideshow, to help recognize cutaneous manifestations of rheumatologic diseases. Also see the slideshow Vasculitis: Case Presentations for more information on clinical, histologic, and radiographic imaging findings in various forms of vasculitis. For information on pediatric PAN, see Childhood Polyarteritis Nodosa.

Insight into PAN requires some understanding of how this rare disease has been defined. Periarteritis nodosa was a term used from the mid 1800s to the 1900s to describe a spectrum of systemic vasculitic disorders, including diseases that manifested as arterial aneurysms, as well as those that caused diffuse necrotizing glomerulonephritis.[3, 4] The term periarteritis nodosa was changed to polyarteritis nodosa in the mid 1900s to reflect the transmural inflammation of arteries caused by this disorder.[5]

The understanding of vasculitides continued to increase by the 1980s with the discovery of antineutrophil cytoplasmic antibodies (ANCAs). Microscopic polyangiitis (MPA; formerly called microscopic polyarteritis) is an ANCA-associated systemic vasculitis that has some features similar to those of classic PAN, with the additional involvement of renal glomeruli and pulmonary capillaries.

Features of PAN

In 1990, the American College of Rheumatology (ACR) established criteria for research purposes in order to differentiate PAN from other forms of vasculitis.[6] A committee of ACR physicians selected 10 disease features of PAN; in order for PAN to be diagnosed, at least 3 of the 10 ACR criteria should be present when radiographic or pathological diagnosis of vasculitis is made[6] (see Presentation and Workup):

  • Weight loss of 4 kg or more
  • Livedo reticularis
  • Testicular pain/tenderness
  • Myalgia or leg weakness/tenderness
  • Mononeuropathy or polyneuropathy
  • Diastolic blood pressure greater than 90 mm/Hg
  • Elevated blood urea nitrogen (BUN) or creatinine level unrelated to dehydration or obstruction
  • Presence of hepatitis B surface antigen or antibody in serum
  • Arteriogram demonstrating aneurysms or occlusions of the visceral arteries
  • Biopsy of small- or medium-sized artery containing polymorphonuclear neutrophils

The strong association of MPA with ANCA, as well as the pathologic and clinical differences between MPA and PAN, demonstrate that PAN and MPA are likely separate disorders. It was not until 1994 that histologic criteria to distinguish PAN from MPA were defined at the international Chapel Hill Consensus Conference (CHCC).[7] According to the CHCC criteria, the presence of vasculitis in arterioles, venules, and capillaries defines the diagnosis of MPA (although small- and medium-sized arteries may also be involved in MPA) and excludes the diagnosis of PAN. (See Presentation, DDx, and Workup.)

Stages

PAN is divided into subacute, acute, and chronic stages. In the subacute stage, infiltration of mononuclear cells becomes more prominent, while in the acute stage, polymorphonuclear neutrophils infiltrate all layers of the vessel wall. (See Etiology.)

In the chronic stage, fibrinoid necrosis of the vessels causes thrombosis and tissue infarction. Aneurysmal dilatations of the involved arteries, as large as 1 cm in size, are characteristic findings of PAN. Kidney lesions show predominant arteritis without glomerulonephritis; however, in patients with severe hypertension, glomerulosclerosis may be superimposed with glomerulonephritis. Pulmonary arteries are not involved, and bronchial artery involvement is uncommon.

Patient education

Patients should understand that PAN can be a progressive systemic disease, and further complications and the involvement of other organ systems are quite common. Many patients attempt to discontinue their medications after initial symptomatic improvement, owing to the potential for adverse effects. Therefore, the benefits of medical treatments should be discussed clearly with the patient, in addition to the risks associated with the long-term use of immunosuppressants. The use of these medications necessitates close monitoring for many years to come. (See Treatment and Medication.)

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Pathophysiology

Vascular lesions in medium-sized muscular arteries occur mainly at bifurcations and branch points. Inflammation may start in the vessel intima and progress to include the entire arterial wall, destroying the internal and external elastic lamina, resulting in fibrinoid necrosis.[5] Aneurysms develop in the weakened vessel, carrying a subsequent risk for rupture and hemorrhage. Thrombi may develop at the site of the lesions. As lesions progress, proliferation of the intima or media may result in obstruction and subsequent tissue ischemia or infarction.[8] Polyarteritis nodosa (PAN) spares large vessels (the aorta and its major branches), the smallest vessels (capillaries and small arterioles), and the venous system.[5]

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Etiology

Hepatitis B and PAN

The pathogenesis of polyarteritis nodosa (PAN) is unknown, and no animal model is available for study. H epatitis B virus (HBV) infection is strongly linked with PAN. Evidence for immune complex–induced disease is confined to HBV-related PAN; the role of immune complexes in non-HBV-related PAN remains unclear.[5] Impaired function of endothelial cells may be part of idiopathic PAN or a consequence of it; in HBV-PAN, virus replication may directly injure the vessel wall.[9] Endothelial dysfunction can perpetuate the inflammation through cytokine and adhesion molecule production.[8]

HBV-associated vasculitis almost always takes the form of PAN. HBV-PAN may occur at any time during the course of acute or chronic hepatitis B infection, although it typically occurs within 6 months of infection.[9]

The activity of HBV-PAN does not parallel that of the hepatitis, and symptoms are the same as those of idiopathic PAN. Small studies have found that GI manifestations, malignant hypertension, renal infarction, and orchiepididymitis were more common in HBV-PAN.[9]

HBV was once the cause of up to 30% of PAN cases.[10] Widespread use of the hepatitis B vaccine has significantly decreased the incidence of HBV-PAN, which is now estimated to account for less than 8% of all PAN cases.[11]

Genetic associations

Loss-of-function mutations in CECR1, the gene that encodes adenosine deaminase 2 (ADA2), have been associated with a spectrum of vascular and inflammatory phenotypes that includes polyarteritis nodosa.[12]  Navon Elkan and colleagues identified six families with multiple cases of systemic and cutaneous polyarteritis nodosa, most of which had onset during childhood. In all the families, disease was traced to recessive mutations in CECR1 that resulted in reduced activity of ADA2.[13]

Possible roles of ADA2 include regulation of the proliferation of activated T cells and macrophages and the differentiation of monocytes to macrophages. Reduction in ADA2 activity  may affect the adenosine inflammatory-response pathway.[13]

Similarly, Gonzalez Santiago et al report two siblings with novel compound heterozygous mutations in CECR1 who were diagnosed with cutaneous PAN in early childhood.[14]

Other disease associations

Controversy has surrounded the potential association of hepatitis C virus (HCV) with PAN. HCV may be linked to cutaneous PAN, a benign, limited form of PAN. In a study of 16 patients with cutaneous PAN, 5 tested positive for hepatitis C.[15] HCV-associated PAN has also been described in 31 patients included in a larger 161 patient cohort with HCV-related vasculitis in France.[16] Despite the presence of serum cryoglobulins, these patients were diagnosed with HCV-PAN on the basis of typical histopathologic features of PAN and/or the presence of microaneurysms and/or multiple stenoses on abdominal and/or renal angiography.

A number of other infectious organisms have been reported in association with PAN or PAN-like diseases, but causal evidence is inconsistent. These organisms include varicella-zoster virus, parvovirus B-19, cytomegalovirus, human T-cell leukemia virus, streptococcal species, Klebsiella species, Pseudomonas species, Yersinia species, Toxoplasma gondii, Rickettsiae, trichinosis, and sarcosporidiosis.[17, 18] Recently, reports of associations with PAN and human immunodeficiency virus[19] and cutaneous PAN and tuberculosis[20] have been published as well.

Some syndromes, including rheumatic diseases, malignancies, and infections have been associated with clinical syndromes indistinguishable from idiopathic PAN. Rheumatoid arthritis (RA) and Sjögren syndrome have been associated with PAN. Notably, the incidence of RA-associated vasculitis has decreased greatly since the 1980s, likely attributable to improvements in the management of RA.[21] Cutaneous PAN occurring with HLA-B39 spondyloarthritis,[22] common variable immunodeficiency,[23] and psoriatic arthritis in an 11-year-old boy[24] have also been reported.

Hematologic malignancies, such as hairy cell leukemia and, in one case, angioimmunoblastic T cell lymphoma, have been associated with PAN-like vasculitides.[25, 26]

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Epidemiology

Occurrence in the United States

Polyarteritis nodosa (PAN) is a rare disease, with an incidence of about 3-4.5 cases per 100,000 population annually. Older estimates placed the prevalence as high as 7.7 cases per 100,000 population, for example, in a population of Alaskan Eskimos hyperendemic for HBV infection.[27]

International occurrence

Depending on the definitions used, the annual estimated incidence of PAN ranges from 1.6 cases per million in south Sweden to 4.6 cases per million in England to 30.7 cases per million adults in Paris, France.[10, 28]

Sex- and age-related demographics

PAN affects men more frequently than women (male-to-female ratio 1.6-2:1). PAN has been diagnosed in persons of every age; however, it is predominantly observed in individuals aged approximately 45-65 years.[8]

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Prognosis

Idiopathic (non–HBV-related) PAN

Traditionally, it has been taught that relapses of polyarteritis nodosa (PAN) are rare in individuals who completely recover. However, a study in Sweden described 10 patients with PAN, 57% of whom experienced relapse within 5 years.[28]

Recovery from neurologic deficits due to PAN can take up to 18 months. Central nervous system (CNS) involvement carries a worse prognosis than does peripheral nerve involvement.[17]

The prognosis is markedly worse in patients with acute abdominal syndromes characterized by extensive bowel involvement.[29] Multiple perforations may be found, relapses are common, and the postoperative course is complicated by infections and delayed healing. Surgery performed for cholecystitis or appendicitis does not appear to worsen prognosis in the same way.

The prognosis is better in patients with cutaneous PAN without systemic involvement. This disease is benign but tends to relapse.

In a retrospective study of 52 patients with childhood-onset PAN who were followed for a mean of 6.2 years, 27 patients (51.9%) were in clinical remission without medication at follow-up, 17 (32.7%) were in clinical remission while on medication, and six patients (11.6%) had a persistent or relapsing disease course. Two patients (3.8%) with severe cerebral involvement died. Cranial nerve palsy occurring during the course of disease was significantly correlated with a worse prognosis. Nephrogenic hypertension at disease onset and seizures during the course of the disease were significantly associated with irreversible organ damage.[30]

Relapses were more frequent among PAN patients with severe gastrointestinal involvement in a retrospective study of 69 pediatric patients, while a higher cumulative dose of cyclophosphamide was associated with a lower relapse risk. During follow-up with a median duration of 6 years, the relapse rate was 35%. The mortality rate was 4%.[31]

HBV-related PAN

Patients who seroconvert usually recover. Once HBV-PAN goes into remission, the risk of recurrence is very low (6% in one series).[11]

HCV-related PAN

One study found that in patients with HCV-related vasculitis, HCV-PAN exhibits a more severe clinical presentation but a higher rate of clinical remission.[16]

Complications

Permanent morbidity due to PAN is relatively rare, although patients may develop peripheral neuropathy, renal insufficiency or renal failure, and/or hypertension. Fever, weight loss, and malaise are present in 50% of patients; renal failure and hypertension, in 60%; arthritis, arthralgia, and myalgia, in 64%; and peripheral neuropathy and mononeuritis multiplex, in 51%.

Complications of PAN include the following:

  • Cutaneous ulcerations
  • Extremity gangrene
  • Organ infarction
  • Aneurysm rupture (intraorgan bleeding) - Aneurysmal ruptures have been reported to occur in the kidneys, liver, heart, pancreas, and axillary and brachial arteries. [32, 33, 34, 35, 36, 37]
  • Stroke
  • Encephalopathy
  • Myelopathy
  • Heart failure
  • Myocardial infarction
  • Pericarditis
  • Renal failure
  • Gastrointestinal (GI) bleeding
  • Bowel infarction
  • Peripheral neuropathy

Mortality

When left untreated, the 5-year survival rate of PAN is 13%. Nearly half of patients die within the first 3 months of onset. Corticosteroid treatment improves the 5-year survival rate to 50-60%. When the steroid is combined with other immunosuppressants, the 5-year survival rate may increase to greater than 80%.

Death associated with PAN occurs as a result of uncontrolled vasculitis, infectious complications related to treatment-induced immunosuppression, and vascular complications of the disease, such as myocardial infarction and stroke. The mortality rate is higher in patients with acute abdominal syndromes.[29] Intractable hypertension contributes to morbidity and mortality rates.

In a cohort of 161 patients with HCV-related vasculitis, there was no significant difference in mortality between HCV-MC patients and those with HCV-PAN. Overall survival rates at 1, 3, and 5 years in HCV-PAN patients were 95% (95% confidence interval [CI], 0.87-1), 89% (95% CI, 0.75-0.98), and 89% (95% CI, 0.75-1), respectively.[16]

Prognostic score

In a prospective study of 342 patients with PAN, Guillevin et al found 5 factors associated with poor prognosis. They devised a 5-factors score (FFS) to predict survival and help guide treatment decisions.[38] The presence of any of the following 5 factors predicts an increased likelihood of mortality:

  • Renal insufficiency (serum creatinine >1.58 mg/dL)
  • Proteinuria (>1 g/d)
  • GI involvement (bleeding, perforation, infarction, pancreatitis)
  • Cardiomyopathy
  • CNS involvement

When the FFS is zero, the predicted mortality rate at 5 years is 11.9%. When the FFS is 1, the mortality rate is 25.9%, and when the FFS is 2 or more, the mortality rate is 45.9%.

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Contributor Information and Disclosures
Author

Dana Jacobs-Kosmin, MD, FACP Attending Physician, Department of Medicine, Division of Rheumatology, Einstein Medical Center; Clinical Assistant Professor of Medicine, Jefferson Medical College of Thomas Jefferson University

Dana Jacobs-Kosmin, MD, FACP is a member of the following medical societies: American College of Physicians, American College of Rheumatology, American Medical Association

Disclosure: Nothing to disclose.

Coauthor(s)

J Mark Jackson, MD Clinical Professor of Medicine/Dermatology, Division of Dermatology, University of Louisville School of Medicine

J Mark Jackson, MD is a member of the following medical societies: American Academy of Dermatology, American Medical Association, Kentucky Medical Association, Texas Medical Association

Disclosure: Nothing to disclose.

Chief Editor

Herbert S Diamond, MD Visiting Professor of Medicine, Division of Rheumatology, State University of New York Downstate Medical Center; Chairman Emeritus, Department of Internal Medicine, Western Pennsylvania Hospital

Herbert S Diamond, MD is a member of the following medical societies: Alpha Omega Alpha, American College of Physicians, American College of Rheumatology, American Medical Association, Phi Beta Kappa

Disclosure: Nothing to disclose.

Acknowledgements

Mahendra Agraharkar, MD, MBBS, FACP, FASN, Clinical Associate Professor of Medicine, Baylor College of Medicine; President and CEO, Space City Associates of Nephrology

Mahendra Agraharkar, MD, MBBS, FACP, FASN is a member of the following medical societies: American College of Physicians, American Society of Nephrology, and National Kidney Foundation

Disclosure: South Shore DaVita Dialysis Center Ownership interest

Bruce A Baethge, MD, Faculty, Texas A&M Medical School

Bruce A Baethge, MD is a member of the following medical societies: Alpha Omega Alpha; American College of Physicians; American College of Rheumatology and Arthritis Foundation

Disclosure: Nothing to disclose.

Kanwarpreet Baweja, MD, Fellow in Nephrology, Division of Renal Diseases and Hypertension, University of Texas Health Science Center

Kanwarpreet Baweja, MD is a member of the following medical societies: American Medical Association, American Society of Nephrology, Medical Council of India, and National Kidney Foundation

Disclosure: Nothing to disclose.

Steve Chung, MD, Director, Clinical Epilepsy Research, Assistant Professor of Clinical Neurology, Residency Director, Department of Neurology, Barrow Neurological Institute

Steven Chung, MD is a member of the following medical societies: American Academy of Neurology, American Epilepsy Society, American Medical Association, California Medical Assocation, and Phi Beta Kappa

Disclosure: Nothing to disclose.

Elliot Goldberg, MD Dean of the Western Pennsylvania Clinical Campus, Professor, Department of Medicine, Temple University School of Medicine

Elliot Goldberg, MD is a member of the following medical societies: Alpha Omega Alpha, American College of Physicians, and American College of Rheumatology

Disclosure: Nothing to disclose.

B Mark Keegan, MD, FRCPC, Assistant Professor of Neurology, College of Medicine, Mayo Clinic; Master's Faculty, Mayo Graduate School; Consultant, Department of Neurology, Mayo Clinic, Rochester

B Mark Keegan, MD, FRCPC is a member of the following medical societies: American Academy of Neurology, American Medical Association, and Minnesota Medical Association

Disclosure: Novartis Consulting fee; Bionest Consulting fee

Howard S Kirshner, MD, Professor of Neurology, Psychiatry and Hearing and Speech Sciences, Vice Chairman, Department of Neurology, Vanderbilt University School of Medicine; Director, Vanderbilt Stroke Center; Program Director, Stroke Service, Vanderbilt Stallworth Rehabilitation Hospital; Consulting Staff, Department of Neurology, Nashville Veterans Affairs Medical Center

Howard S Kirshner, MD is a member of the following medical societies: Alpha Omega Alpha, American Academy of Neurology, American Heart Association, American Medical Association, American Neurological Association, American Society of Neurorehabilitation, National Stroke Association, Phi Beta Kappa, and Tennessee Medical Association

Disclosure: Nothing to disclose.

Carlos J Lozada, MD Director of Rheumatology Fellowship Program, Professor, Department of Medicine, Division of Rheumatology and Immunology, University of Miami, Leonard M Miller School of Medicine

Carlos J Lozada, MD is a member of the following medical societies: American College of Physicians and American College of Rheumatology

Disclosure: Pfizer Honoraria Speaking and teaching; Amgen Honoraria Speaking and teaching

Christopher Luzzio, MD, Clinical Assistant Professor, Department of Neurology, University of Wisconsin at Madison School of Medicine and Public Health

Christopher Luzzio, MD is a member of the following medical societies: American Academy of Neurology

Disclosure: Nothing to disclose.

Francisco Talavera, PharmD, PhD Adjunct Assistant Professor, University of Nebraska Medical Center College of Pharmacy; Editor-in-Chief, Medscape Drug Reference

Disclosure: Medscape Salary Employment

Vasanta P Weiss, MD, Consulting Staff, Department of Nephrology, University of Virginia Medical Center

Disclosure: Nothing to disclose.

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Nonspecific, firm, tender subcutaneous nodules without livedo reticularis and/or systemic involvement may be the first sign of polyarteritis nodosa (PAN).
Tender, hyperpigmented, firm subcutaneous nodules with a background of livedo reticularis common in cutaneous polyarteritis nodosa (PAN).
Tender erythematous nodules with central "punched out" ulcerations common in cutaneous polyarteritis nodosa (PAN).
Polyarteritis nodosa (PAN) is characterized by fibrinoid necrosis of the arterial wall with a leukocytic infiltrate. In this slide, a large, pale occlusion of a muscular artery can be seen. Within this collagenous tissue is a leukocytic infiltrate, which is the hallmark of PAN. Courtesy of Urbana Atlas of Pathology.
Livedo reticularis in polyarteritis nodosa (PAN).
 
 
 
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