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[Peripheral neuropathies and monoclonal dysglobulinemias: contribution of morphological study]
1Service de Neurologie, CHU Dupuytren, Limoges.
Abstract:
The association between a peripheral neuropathy (PN) and a monoclonal dysglobulinemia has often been reported. A causative link is however not always easy to establish. Therefore, to demonstrate with certainty that the dysglobulinemia is actually responsible for the PN, various clinical, electrophysiological and immunological criteria are employed. As a result of our personal experience, we wish to emphasize the benefit of the histological and immunopathological findings revealed by the nerve biopsy of these patients. The nerve biopsy results have, in addition, been combined and compared with the results of an indirect immunofluorescence study of the sera of these patients on normal human nerve. The results of these studies have permitted us, in about 70% of cases, to ascertain the mechanisms in question: the role of an eventual chemotherapy, the dysimmune process, the presence of abnormal immunoglobulins in the nerve, amyloidosis deposits, infiltrations of nerve parenchyma by abnormal cells, a combination of one or several of these mechanisms, etc... We were able to divide our 70 patients into 4 groups: group 1: "direct link" (55-60% of the cases), group 2: "indirect link" (10-15%), group 3: "no link" (10%), and group 4: "undetermined link" (about 20%). Analysis of group 1 revealed a statistically significant association between PN and type IgM Kappa MGUS.
Insights
Peripheral neuropathy (PN) linked to monoclonal dysglobulinemia is clarified using nerve biopsies and immunofluorescence. A direct association was found between PN and IgM Kappa MGUS in over half of the patients studied.
Area of Science:
- Neurology
- Immunology
- Pathology
Context:
- Peripheral neuropathy (PN) is frequently associated with monoclonal dysglobulinemia, but establishing a causal link is challenging.
- Clinical, electrophysiological, and immunological criteria are used to determine the relationship between PN and monoclonal dysglobulinemia.
Purpose:
- To highlight the diagnostic value of nerve biopsy and immunopathology in patients with PN and monoclonal dysglobulinemia.
- To correlate nerve biopsy findings with indirect immunofluorescence studies of patient sera.
Summary:
- Nerve biopsies combined with immunofluorescence studies helped ascertain causal mechanisms in approximately 70% of 70 patients.
- Identified mechanisms include chemotherapy effects, immune processes, abnormal immunoglobulins in nerves, amyloidosis, and neoplastic cell infiltration.
- Patients were categorized into four groups: direct link (55-60%), indirect link (10-15%), no link (10%), and undetermined link (20%).
- A statistically significant association was observed between PN and IgM Kappa monoclonal gammopathy of undetermined significance (MGUS) in the direct link group.
Impact:
- Nerve biopsy and immunopathology provide crucial insights into the pathogenesis of PN associated with monoclonal dysglobulinemia.
- Findings aid in understanding the diverse mechanisms underlying PN in this patient population.
- The study identifies a specific association between IgM Kappa MGUS and PN, guiding further research and clinical management.