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Minimal and asymptomatic chronic inflammatory demyelinating polyneuropathy
A Uncini1, A Di Muzio, M V De Angelis
1Center for Neuromuscular Diseases, University G d'Annunzio, Chieti, Italy. uncini@unich.it
Summary
Minimal chronic inflammatory demyelinating polyneuropathy (CIDP) presents with mild symptoms but clear electrophysiological motor fiber involvement. These benign CIDP cases represent 8% of the spectrum.
Area of Science:
- Neurology
- Clinical Electrophysiology
Background:
- Chronic inflammatory demyelinating polyneuropathy (CIDP) is a heterogeneous neurological disorder.
- CIDP exhibits significant variability in clinical presentation and severity.
Purpose of the Study:
- To characterize CIDP cases with minimal clinical symptoms.
- To determine the appropriate terminology for mild CIDP presentations.
- To assess the prevalence of minimal CIDP within a patient cohort.
Main Methods:
- Case series involving patients with prolonged distal paresthesiae or pain.
- Clinical examination assessing sensory and motor function, and reflexes.
- Electrophysiological studies (nerve conduction studies) to evaluate for demyelination and conduction block.
- Cerebrospinal fluid (CSF) analysis for protein levels.
- Nerve biopsy for histological examination.
- Genetic testing to exclude specific CIDP-associated genetic factors.
Main Results:
- Patients presented with mild sensory symptoms (paresthesiae, pain) and normal or near-normal motor strength.
- Electrophysiology confirmed demyelinating neuropathy without motor conduction block.
- Elevated CSF protein and evidence of de-myelination with axonal loss on nerve biopsy were observed.
- Genetic analysis ruled out 17p.11.2 duplication/deletion-associated neuropathy.
Conclusions:
- Mild CIDP cases, termed 'minimal CIDP', exhibit electrophysiological motor involvement despite minimal symptoms.
- These cases represent the most benign end of the CIDP spectrum.
- Minimal or asymptomatic CIDP accounted for 8% of cases in this series.