Innovative Medical Technology
Neurometer® Painless Carpal Tunnel Syndrome (CTS) Diagnostic Evaluation and Screening
The sensory Nerve Conduction Threshold (sNCT) evaluation and screening for Carpal Tunnel Syndrome (CTS) begins with testing conducted at the distal phalange of the index finger (B). Early CTS is associated with hyperesthetic CPTs (abnormally low electrical excitability) reflecting inflamed nerves (neuritis) that have not lost their functioning. Advanced CTS, associated with a loss of median nerve function (neuropathy), is associated with hypoesthetic (abnormally high) CPTs. The combination of a sensory impairment detected at the distal phalange of the index finger (Site B), combined with normal CPT measures from the ulnar nerve (5th finger, Site E) and palmar branch of the median nerve (Site I, pre-tunnel control site), objectively confirms the clinical diagnosis of CTS. The CPT evaluation can detect CTS in the presence of a polyneuropathy. This electrodiagnostic procedure confirms the recovery of median nerve function following conservative or surgical treatment of CTS. Screening for CTS in industrial settings results in the prevention of advanced complications and significant financial savings.
Focal nerve lesions, such as
those induced by a traumatic injury, are evaluated and confirmed by
determining a normal sensory function proximal to the suspected lesion and
abnormal function distally. For example, evaluation of carpal tunnel
syndrome is performed by testing the median nerve proximal and distal to the
carpal tunnel - at the palmar cutaneous branch of the median nerve and the
distal digital branches of the median nerve, respectively. Upon obtaining
measures consistent with the suspected condition, the distal digital
branches of the ulnar nerve at the little finger are evaluated to rule out a
distal polyneuropathy mimicking or co-existing with carpal tunnel syndrome.
Excerpt from Recurrent Nerve
Compression: Around the Hand Table: Hand Surgery Quarterly, Winter
2005 pgs. 7-18. A Publication of the American Association for Hand Surgery.
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