Washington, I., M. Shih, S. Burastero, P. Tittiranonda
"In response to the growing number of reported cases of CTS, many companies have introduced screening tools to detect CTS in its early stages. Formal nerve conduction studies are considered the "gold standard" for CTS diagnoses, and abnormality in nerve function is considered one of the earliest indicators of a developing compression neuropathy. This study evaluates the reliability of a portable nerve conduction monitor (Nervepace S-200, Neurotron Medical, New Jersey) which measures both motor and sensory nerve latencies. This instrument's portability and ease of use have made it potentially attractive to health and safety officers interested in conducting active surveillance in the field. It may provide inexpensive, fast, and reliable results in settings where formal nerve conduction testing is infeasible.
In this study, we examined the reliability of the portable monitor in measuring median and ulnar nerve latencies. All testing was perfomed by one operator on 28 volunteer subjects between the ages of 20 and 35, 11 male and 17 female, who had no prior symptoms of CTS. The median motor, median sensory, ulnar motor, and ulnar sensory latencies of each subject were measured at the same time each day for three consecutive days. The results showed a high degree of intrarater reliability. No significant differences were found in latencies between days among any of the 4 groups of measurements (p<0.05), and the coefficient of variation was less than .2 ms. for all measurements, with the variation being highest in motor latency measurement of the ulnar nerve.
...In addition, the actual testing (Nervepace) requires 15 minutes to complete as compared to 30-45 minutes using the standard nerve conduction machine, and the average cost per test is $35 as compared to up to $500 for the standard nerve conduction study."
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