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

Theodore N. Armstrong, Ann M. Dale, Muhammad T. Al-Lozi, Alfred Franzblau, Bradley A. Evanoff

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

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.

Original languageEnglish
Pages (from-to)758-764
Number of pages7
JournalJournal of occupational and environmental medicine
Volume50
Issue number7
DOIs
StatePublished - Jul 2008

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