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  • Title: [New elements in the diagnosis and the treatment of primary AL amyloid polyneuropathy and neuropathy due to POEMS syndrome].
    Author: Adams D, Lozeron P, Theaudin M, Ribrag V, Bourhis JH, Lacroix C.
    Journal: Rev Neurol (Paris); 2011 Jan; 167(1):57-63. PubMed ID: 21190703.
    Abstract:
    INTRODUCTION: Primary AL amyloid polyneuropathy (AL-PN) and neuropathy due to POEMS syndrome (POEMS-N) are rare, associated with a monoclonal gammopathy (MG) IgGλ or IgAλ at a low rate and systemic manifestations. They are invalidating and life-threatening. STATE OF THE ART: AL-PN usually mimics small fiber length-dependent axonal polyneuropathies, but also multifocal or painful neuropathies, POEMS-N corresponds to a rapid ascending CIDP with MG. To confirm the diagnosis of AL-PN, initial investigations should identify amyloidosis on nerve or accessory salivary glands, to establish the type of amyloid after serum free light-chain (FLC) measurements. For the diagnosis of N-POEMS, diagnosis is based on the presence of four criteria proposed by Dispenzieri. These neuropathies are associated with biomarkers, useful for diagnosis and treatment monitoring: elevated serum level of FLC monoclonal in (AL-PN) or VEGF (N-POEMS). PERSPECTIVES: Early diagnosis of these neuropathies and early treatment using high-dose melphalan associated with an autologous hematopoietic stem cell graft or low monthly doses can improve the clinical manifestations and patient survival. CONCLUSIONS: Systematic search for monoclonal gammopathy by immunofixation and serum free light chains is very useful for the management of progressive peripheral neuropathies of unknown origin.
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