Elsevier

Neurologic Clinics

Volume 15, Issue 4, 1 November 1997, Pages 835-848
Neurologic Clinics

NECROTIZING PERIPHERAL NERVE VASCULITIS

https://doi.org/10.1016/S0733-8619(05)70350-9Get rights and content

Necrotizing vasculitis, especially that of the type observed in poly-arteritis nodosa (PAN), affects arteries of the epineurium and induces nerve ischemia when vasa nervorum are occluded. Necrotizing arteritis is associated with symptomatic and asymptomatic nerve lesions owing to ischemia.1, 24, 27 It also occurs secondarily in the course of neuropathy associated with infection, malignancy, and focal diabetic neuropathy. It further causes ischemic nerve lesions on preexisting ones.

The classification of vasculitis is still a matter of controversy because it has often been based on the size of the vessels predominantly affected,46 even though overlaps occur. Recent attempts to modify the classification of systemic vasculitides22 have not achieved further clarification. Large vessel vasculitis, which includes giant cell arteritis and Takayasu's arteritis, is seldom associated with peripheral neuropathy, and further, neuropathy is rare in cranial (giant cell) arteritis, and when present, is usually due to lesions of epineurial vessels of the type observed in PAN.5, 36 Of the medium-sized vessel vasculitic disorders, which include PAN and Kawasaki's disease, neuropathy occurs only in PAN. The group of small vessel vasculitis generally includes Wegener's granulomatosis, Churg-Strauss syndrome, and microscopic polyangiitis (with involvement of capillaries), which actually in many cases, overlaps with PAN. The nomenclature of the systemic vasculitides remains enigmatic25 owing to the lack of specific biologic markers, except for Wegener's granulomatosis in which the presence of antineutrophil cytoplasmic antibodies (c-ANCA) can be of value.

Section snippets

PERIPHERAL NEUROPATHY OF NECROTIZING ARTERITIS

Necrotizing arteritis is the most common primary vasculitis responsible for vasculitic neuropathy and encompasses local and systemic mechanisms of vascular inflammation that involve large or small vessels; it leads to vessel and tissue necrosis with typical leucocytic infiltration, leucocytoclasia, hemorrhage, and fibrinoid change.46 Clinical neuropathy occurs in 50% to 75% of patients with systemic vasculitis of the PAN group.17, 29 Subclinical lesions are probably much more common. A similar

EVOLUTION OF ISCHEMIC NEUROPATHY

Under treatment, mainly with long-term corticosteroids, recovery of motor deficits because of ischemic neuropathy takes months, because the lesions are axonal. In many patients, there is no residual deficit after 6 to 12 months. Sensory loss gradually recedes, but is often incomplete. Residual pain is common and may be difficult to differentiate from a relapse of the neuropathy, especially in patients who lack general manifestations or elevated biological markers of inflammation.

When neuropathy

NEUROPATHY IN WEGENER'S GRANULOMATOSIS

The neurologic manifestations of Wegener's granulomatosis were reviewed retrospectively in 324 patients at the Mayo Clinic.31 Overall, 109 patients (33.6%) had neurologic manifestations, including 53 with peripheral neuropathy. A multifocal neuropathy was seen in 42 patients, a distal symmetric polyneuropathy in 6, and an unclassified peripheral neuropathy in 5. Neuropathy was a major presenting symptoms in 8 of 22 patients with mononeuropathy multiplex who underwent detailed evaluation. The

NECROTIZING VASCULITIS IN NEUROPATHY OF OTHER ORIGINS

A secondary vasculitis neuropathy with lymphocytic inflammation occurs in (1) infections, such as retroviral infection, leprosy, and Lyme disease35; (2) the delayed type hypersensitivity reactions of tuberculoid leprosy and reversal reactions in lepromatous neuropathy; (3) lymphoproliferative disorders and other cancers; and (4) occasionally in multifocal diabetic neuropathy.

INDICATION OF NERVE BIOPSY FOR DIAGNOSIS OF VASCULITIS

Vasculitis is one of the most treatable forms of neuropathy, and its diagnosis should not be missed. It is unmistakable when acute or subacute multifocal neuropathy occurs in the context of multisystem involvement, including renal insufficiency, ischemic lesions of the skin, especially of the lower extremities, asthma, or eosinophilia. In such patients the diagnosis of necrotizing vasculitis is easily suspected clinically and confirmed by nerve and muscle biopsy. In older patients with

TREATMENT

With the use of corticosteroids in treatment of PAN, the 5-year survival decreased from 13% in the control group to 48% in treated patients.15 It is widely agreed that one can start with prednisone at 1 mg/kg/d, although some start with 2 mg/kg/d. High doses of corticosteroids may not be well tolerated in the elderly. Simultaneous treatment with oral cyclophosphamide, 2mg/kg/d, or by monthly pulses of 1g i.v. may help to reduce the doses of corticosteroids. In cases with severe general

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    Address Reprint Requests to Professor Girard Said, Service de Neurologie, CH de Bicêtre, 78, rue du Général Leclerc, 94275 Le Kremlin Bicêtre, France

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    From the Service de Neurologie, Hôpital de Bicêtre, Université Paris Sud, Paris, France

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