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J Occup Environ Med. 2008 Jul;50(7):758-64. doi: 10.1097/JOM.0b013e3181645425.

Median and ulnar nerve conduction studies at the wrist: criterion validity of the NC-stat automated device.

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1
Department of General Medical Sciences, Washington University School of Medicine, St. Louis, MO 63110, USA.

Abstract

OBJECTIVE:

To compare results obtained with the NC-stat--an automated nerve testing device--to traditional nerve conduction studies relevant to carpal tunnel syndrome screening.

METHODS:

Thirty-three subjects recruited from patients referred for electrodiagnostic testing were studied. Measurements including the distal motor latency (DML), distal sensory latency (DSL), and median-ulnar latency difference (MUD) were obtained by the NC-stat and by standard nerve conduction studies.

RESULTS:

With modifications to the NC-stat's suggested reference ranges, sensitivity with respect to the traditional results ranged from 93.8% (sensory MUD) to 100% (median DML and DSL) and specificity ranged from 84.6% (motor MUD) to 94.1% (sensory MUD). Sensitivity was as high or higher and specificity was lower when using the manufacturer's suggested cutoffs.

CONCLUSION:

The NC-stat appears to be a convenient and sensitive method for detecting median nerve pathology at the wrist.

PMID:
18617831
DOI:
10.1097/JOM.0b013e3181645425
[Indexed for MEDLINE]

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