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
Median Motor Latency
Median Sensory Amplitude
Diagnosis
> 7.6 msec
<= 13 microseconds
severe CTS
5.3 to 7.6 msec
<= 13 microseconds
moderate CTS
<= 5.2 msec
<= 13 microseconds
mild CTS
<= 3.8 msec
14 to 18 microvolts
no abnormality
> 3.8 msec
14 to 18 microvolts
mild CTS
<= 4.3 msec
> 18 microvolts
no abnormality
> 4.3 msec
> 18 microvolts
mild CTS
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