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KMID : 0860920070090010059
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Journal of the Korean Association EMG-Electrodiagnostic Medicine
2007 Volume.9 No. 1 p.59 ~ p.62
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Can Repeated Current Perception Threshold Testing Detect Malingering?
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Hong Bo-Young
Kim Min-Wook
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Abstract
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Objective: To find out whether repeated current perception threshold (CPT) testing can be used in sub- jects simulating sensory loss to identify malingering. Our hypothesis was the reproducibility of CPT in simulating normal subjects would be low because they could not memorize their level of sensory loss.
Methods: We evaluated 16 normal subjects pretending as if he or she had sensory loss and 25 patients who complained sensory disturbance. CPT level was checked twice with five-minute interval at the distal interphalangeal joint of the 4th finger in the normal subjects and at the area where sensory loss exists in the patients. Three different frequencies (2000, 250 and 5 Hz) of current were delivered to each person.
Results: Reproducibility of the two results of 5 minute gap was not significantly different in both patients and malingering subject groups.
Conclusion: We found that CPT test was quite reproducible even to the malingering normal subjects. Therefore we need to use CPT only as a supplementary tool, especially in patients who wish to demon- strate more disability than they have, for whatever reason.
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KEYWORD
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Current perception threshold, Malingering, Neuropathy
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