Indeed, of the 338 patient records I examined, 14% of those referred with suspicion of CTS had no evidence of nerve damage found with electrodiagnostic testing. A third possibility is that the test may yield normal results. In most of these patients, EMG/NCS serves to confirm the presence of median nerve pathology and to describe how severe it is, but other disorders like radiculopathy and ulnar nerve compromises can also be found masquerading as carpal tunnel syndrome. Several weeks ago I published a blog describing the kinds of neurologic disorders revealed by electromyography and nerve conduction studies (EMG/NCS) in patients who are suspected of carpal tunnel syndrome (CTS) on clinical grounds.
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