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Quantitative sensory testing: high sensitivity in small fiber neuropathy with normal NCS/EMG
Paul Magda1, Norman Latov, Michelle V Renard
1Peripheral Neuropathy Center, Department of Neurology and Neuroscience, Weill Medical College of Comell University, New York, NY 10022, USA.
Journal of the Peripheral Nervous System : JPNS
|December 13, 2002
Summary
Quantitative sensory testing (QST) effectively diagnoses small-fiber neuropathy when traditional tests fail. This method accurately identifies abnormal sensory thresholds in patients with this condition.
Area of Science:
- Neurology
- Neuroscience
- Clinical Diagnostics
Background:
- Small-fiber neuropathy (SFN) presents diagnostic challenges.
- Traditional electrodiagnostic studies often yield normal results in SFN.
- Accurate diagnosis is crucial for patient management.
Purpose of the Study:
- To evaluate the diagnostic sensitivity of quantitative sensory testing (QST) for small-fiber neuropathy.
- To assess QST's effectiveness in patients with normal conventional electrodiagnostic findings.
Main Methods:
- Utilized the CASE IV system for quantitative sensory testing.
- Included 14 patients clinically diagnosed with small-fiber neuropathy.
- Compared QST results with traditional electrodiagnostic studies.
Main Results:
- All 14 patients exhibited at least one abnormal sensory threshold via QST.
- 13 patients showed abnormal heat-pain thresholds.
- 8 patients had abnormal cold thresholds, and 7 had abnormal vibration thresholds.
Conclusions:
- Quantitative sensory testing demonstrates high diagnostic sensitivity for small-fiber neuropathy.
- QST is a valuable tool for documenting small fiber dysfunction when other methods are inconclusive.