Carpal tunnel syndrome with normal nerve conduction studies

Area of Science:

• Neurology
• Clinical Neurophysiology

Background:

• The diagnostic value of electrodiagnostic testing for carpal tunnel syndrome (CTS) remains debated.
• Clinical presentation alone can be insufficient for accurate CTS diagnosis.

Purpose of the Study:

• To evaluate the utility of nerve conduction studies (NCS) in patients meeting clinical criteria for CTS.
• To compare outcomes between CTS patients with normal versus abnormal NCS.
• To determine if NCS can predict the response to conservative management.

Main Methods:

• Patients meeting clinical CTS criteria were divided into groups based on NCS results (normal vs. abnormal).
• Logistic regression models were used to assess the predictability of NCS findings from clinical features.
• The correlation between NCS results and the outcome of conservative management was analyzed.

Main Results:

• A significant portion (25%) of CTS patients without confounding disorders had normal NCS.
• Patients with abnormal NCS were generally older, heavier, and exhibited more pronounced CTS symptoms.
• Clinical features did not accurately predict NCS results, particularly in borderline cases.
• NCS findings did not reliably predict the success of conservative CTS management.

Conclusions:

• Nerve conduction studies offer independent diagnostic information in suspected carpal tunnel syndrome, particularly when clinical evidence is less definitive.
• Electrodiagnostic testing is not a reliable predictor of treatment outcomes for nonsurgical management of CTS.