A new technique for dorsal sural nerve conduction study with surface strip electrodes

Area of Science:

• Neuroscience
• Clinical Electrophysiology

Background:

• Nerve conduction studies are crucial for diagnosing peripheral neuropathies.
• Optimizing signal amplitude in sensory nerve action potentials (SNAPs) is essential for accurate diagnosis.
• The dorsal sural nerve (DSN) is a key nerve for assessing lower limb sensory function.

Purpose of the Study:

• To introduce and evaluate a novel method for dorsal sural nerve conduction studies using surface strip electrodes (SSEs).
• To compare the amplitude of dorsal sural SNAPs obtained with SSEs against a conventional method.

Main Methods:

• Dorsal sural SNAPs were recorded orthodromically in 49 healthy volunteers.
• A new technique utilized surface strip electrodes (SSEs) placed on the laterodorsal aspect of the foot for DSN stimulation.
• Findings were compared with a conventional method using a standard bipolar stimulator.

Main Results:

• The mean peak-to-peak amplitude of dorsal sural SNAPs using SSEs was 12.9±6.3μV.
• The SSE method yielded amplitudes 118.6% higher than the conventional method (12.9μV vs. 5.9μV; P<0.001).
• Mean nerve conduction velocity was 44.8±5.5m/s.

Conclusions:

• Surface strip electrodes (SSEs) consistently provide higher amplitude dorsal sural SNAPs.
• This improved amplitude is attributed to the ability of SSEs to elicit SNAPs from all digital branches of the DSN.
• The SSE method offers a more sensitive approach for dorsal sural nerve conduction studies, particularly in cases of varied DSN innervation.