Rudolfer et al reported several models for the diagnosis of carpal tunnel syndrome. Two models use a decision tree, one multivariate and one bivariate. The authors are from the University of Manchester.
Patient selection: evaluate for carpal tunnel syndrome
Analysis: nerve conduction of the median nerve
Parameters:
(1) median nerve motor latency at the wrist in milliseconds
(2) median nerve sensory amplitude in microvolts
(3) median nerve sensory latency
Median Motor Latency
Median Sensory Amplitude
Median Sensory Latency
Diagnosis
> 7.6 msec
NA
NA
severe CTS
6.6 to 7.6 msec
NA
NA
moderate CTS
4.4 to 6.5 msec
> 15 microvolts
NA
mild CTS
<= 4.3 msec
> 15 microvolts
NA
no abnormality
<= 6.5 msec
<= 15 microvolts
> 4.2 msec
moderate CTS
5.6 to 6.5 msec
<= 15 microvolts
<= 4.2 msec
mild CTS
<= 5.5 msec
<= 15 microvolts
<= 4.2 msec
moderate CTS
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