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[Sural neurography: comparative study in stimulation with surface and needle electrodes].
EEG-EMG Zeitschrift Fur Elektroenzephalographie, Elektromyographie Und Verwandte Gebiete
|March 1, 1983
Summary
Surface electrodes yield higher sural sensory nerve conduction velocity and amplitude compared to needle electrodes in healthy adults. A formula allows conversion between the two methods for accurate nerve conduction studies.
Area of Science:
- Neuroscience
- Electrophysiology
Background:
- Nerve conduction studies (NCS) are crucial for diagnosing peripheral neuropathies.
- Standardizing NCS techniques, particularly electrode type, is essential for reliable results.
- Sural nerve conduction parameters are commonly assessed using both surface (SE) and needle (NE) electrodes.
Purpose of the Study:
- To compare sural sensory nerve conduction velocity (NCV), nerve action potential (NAP) duration, and amplitude using SE and NE.
- To establish a conversion formula between SE and NE for sural sensory NCV.
Main Methods:
- Thirty healthy volunteers (18-30 years) participated.
- Sural nerve conduction parameters were measured using SE and NE at the lateral malleolus.
- Skin temperature was controlled and NCV adjusted to 35°C.
Main Results:
- Both NCV and NAP-amplitude were significantly higher with SE compared to NE.
- Mean NCV: SE 56.78 m/s vs. NE 53.27 m/s.
- Mean NAP-amplitude: SE 27.3 µV vs. NE 12.21 µV.
- NAP-duration was similar for both methods (1.3 ms).
- A linear regression formula was derived: NE-SNCV = 26.57 + 0.47 * SE-SNCV.
Conclusions:
- Surface electrodes provide higher sural sensory nerve conduction values than needle electrodes.
- The derived formula enables accurate conversion of NCV measurements between SE and NE techniques.
- These findings aid in standardizing sural nerve conduction studies.