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Median nerve F-wave study derived by flexor carpi radialis
C Marchini1, R Marinig, P Bergonzi
1Department of Neurology, University of Udine, Italy.
Electromyography and Clinical Neurophysiology
|December 8, 1998
Summary
This study introduces a new method for diagnosing cervical radiculopathies by analyzing F-waves. This technique specifically targets C6-C7 roots, offering improved diagnostic criteria for these common nerve conditions.
Area of Science:
- Neurophysiology
- Neurology
- Clinical Electrophysiology
Background:
- F-responses are valuable diagnostic tools for cervical radiculopathies, typically assessed via ulnar or median nerve stimulation.
- Current methods primarily evaluate the 8th cervical and 1st thoracic roots, leaving a gap in assessing C6-C7 roots.
- Cervical radiculopathies affecting C6-C7 roots require specific diagnostic approaches.
Purpose of the Study:
- To introduce and validate a novel method for studying F-waves.
- To specifically target and evaluate the C6-C7 cervical roots using median nerve stimulation and flexor carpi radialis derivation.
- To establish new diagnostic criteria for C6-C7 radiculopathies.
Main Methods:
- Median nerve stimulation with flexor carpi radialis (FCR) muscle derivation was employed.
- F-waves were recorded and analyzed in 47 healthy subjects (94 nerves) aged 21-59.
- The method was subsequently applied to 6 patients with confirmed C6-C7 radiculopathy.
Main Results:
- F-waves were clearly identifiable in all 94 nerves from the healthy cohort.
- Normal F-wave latency ranged from 18.0 to 24.0 msec, with a mean of 21.4 +/- 1.48 msec (2 SD).
- The study reports findings from 6 paradigmatic cases of C6-C7 radiculopathy using the new method.
Conclusions:
- Median nerve stimulation with flexor carpi radialis derivation is an effective method for studying F-waves.
- This technique provides reliable data for evaluating C6-C7 root function.
- The described method offers a valuable diagnostic tool for C6-C7 cervical radiculopathies.