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Cryptogenic polyneuropathy: clinical and neurophysiological findings
Jonas Lindh1, Martin Tondel, Anders Osterberg
1Section of Neurology, Department of Internal Medicine, Ryhov County Hospital, Jönköping, Sweden. jonas.lindh@it.se
Journal of the Peripheral Nervous System : JPNS
|February 11, 2005
Summary
This study describes cryptogenic polyneuropathy, a slow nerve lesion primarily affecting men. Most patients experience mild to moderate sensorimotor polyneuropathy, often starting with distal numbness.
Area of Science:
- Neurology
- Clinical Neuroscience
Background:
- Cryptogenic polyneuropathy (CPN) is a diagnosis of exclusion, necessitating detailed characterization.
- Understanding CPN's clinical and neurophysiological profile is crucial for diagnosis and management.
Purpose of the Study:
- To delineate the clinical and neurophysiological characteristics of CPN in a large patient cohort.
- To identify demographic and symptomatic patterns associated with CPN.
Main Methods:
- Retrospective analysis of medical records from 168 patients diagnosed with CPN between 1993 and 2000.
- Inclusion criteria: age 40-79 years, diagnosis of CPN.
- Data collection included clinical symptoms, neurological examination findings, and neurophysiological test results.
Main Results:
- The study included 168 patients (68% male), with a mean age of 61 at symptom onset and 64 at diagnosis.
- Distal numbness (68%) was the most frequent symptom; decreased proprioception/vibration sense (80%) and loss of ankle jerks (78%) were common findings.
- Neurography revealed a mixed sensorimotor polyneuropathy, predominantly axonal (70%) or mixed axonal/demyelinating.
Conclusions:
- CPN presents as a slowly progressive sensorimotor nerve lesion, primarily of axonal type.
- Men are more frequently affected than women.
- The majority of patients exhibit mild to moderate polyneuropathy severity.