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Inflammatory vasculopathy in multifocal diabetic neuropathy
Gérard Said1, Catherine Lacroix, Pierre Lozeron
1Service de Neurologie and Laboratoire Louis Ranvier, Hôpital de Bicêtre, Assistance Publique-Hôpitaux de Paris and Université Paris-sud, France. gerard.said@bct.ap-hop-paris.fr
Brain : a Journal of Neurology
|January 23, 2003
Summary
Diabetic multifocal sensory-motor deficits (MDN) involve nerve trunks, unlike common diabetic polyneuropathy (DSP). MDN is linked to blood vessel inflammation and damage in nerves, distinct from DSP's typical presentation.
Area of Science:
- Neurology
- Diabetology
- Pathology
Background:
- Diabetic patients can develop distal symmetrical polyneuropathy (DSP) or multifocal sensory-motor deficits (MDN).
- MDN involves nerve roots, plexus, and trunks, presenting clinically different from DSP.
- Nerve ischemia is a proposed mechanism, but clinical differences suggest additional factors.
Purpose of the Study:
- To prospectively investigate the characteristics and underlying pathology of multifocal sensory-motor deficits (MDN) in diabetic patients.
- To differentiate MDN from distal symmetrical polyneuropathy (DSP) based on clinical and pathological findings.
Main Methods:
- Studied 22 diabetic patients with MDN, excluding other causes of neuropathy.
- Performed nerve biopsy on affected sensory nerves.
- Conducted electrophysiological testing and cerebrospinal fluid (CSF) analysis.
- Compared findings with nerve biopsies from 30 patients with severe DSP.
Main Results:
- MDN presented with progressive neurological deficits, predominantly in lower limbs, often asymmetrical.
- Nerve biopsies revealed severe axonal lesions, asymmetrical axonal loss, and evidence of vasculitis, hemorrhage, and inflammation.
- Patients with MDN showed significantly higher levels of endoneurial inflammation and vascular abnormalities compared to DSP patients.
Conclusions:
- Multifocal sensory-motor deficits (MDN) in diabetic patients are associated with pre-capillary blood vessel involvement.
- An inflammatory response secondary to vascular damage is a key feature distinguishing MDN from DSP.
- MDN represents a distinct neuropathic pattern in diabetes, driven by vascular pathology.