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Compound nerve action potentials from the median and ulnar nerves
Archives of Physical Medicine and Rehabilitation
|January 1, 1987
Summary
This study introduces a novel electrodiagnostic technique for assessing upper extremity neuropathies. It establishes normative values for nerve conduction studies, aiding in the diagnosis of nerve damage.
Area of Science:
- Neuroscience
- Clinical Electrophysiology
Background:
- Nerve conduction studies are crucial for diagnosing peripheral neuropathies.
- Standard electrodiagnostic methods can be limited in sensitivity for certain nerve conditions.
Observation:
- Compound nerve action potentials (MNAP and SNAP) were recorded from median and ulnar nerves in 20 healthy subjects.
- Amplitude ratios and conduction velocities were analyzed, establishing normative data.
- Specific thresholds for abnormal SNAP/MNAP amplitude ratios and conduction velocities were identified.
Findings:
- An SNAP/MNAP amplitude ratio > 0.25, intermediate MNAP velocity < 49.5 m/sec, and intermediate SNAP velocity < 45.5 m/sec were found to exceed 2SDs from the mean.
- Median MNAP latency across the carpal tunnel was 1.0 ± 0.3 ms.
- Ulnar MNAP conduction velocity across the elbow was 59.7 ± 3.8 m/sec.
Implications:
- The developed technique provides objective electrophysiological measures for evaluating upper extremity neuropathies.
- These findings may supplement existing diagnostic tools for nerve disorders.
- Establishing normative data is essential for accurate clinical interpretation of nerve conduction studies.