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Related Experiment Videos

Comparison between median and ulnar sensitive action potential (SAP) obtained with two different stimulation methods

S Premoselli1, V Galimberti, C Cerri

  • 1Neurorehabilitation Unit, University of Milan, Seregno, Milan, Italy.

Electromyography and Clinical Neurophysiology
|March 1, 1995
PubMed
Summary

This study compared two methods for measuring sensory action potentials (SAP) in median and ulnar nerves across age groups. Supra-maximal stimulation significantly increased SAP amplitude, particularly in older adults.

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Area of Science:

  • Neuroscience
  • Electrophysiology
  • Nerve Conduction Studies

Background:

  • Sensory Action Potentials (SAP) are crucial for assessing peripheral nerve function.
  • Age-related changes can affect nerve conduction parameters.
  • Standardized electrodiagnostic techniques are essential for accurate nerve evaluation.

Purpose of the Study:

  • To compare two distinct stimulation methods for recording sensory action potentials (SAP) in healthy subjects.
  • To investigate age-related differences in SAP parameters (latency and amplitude) of median and ulnar nerves.
  • To evaluate the impact of stimulus intensity on SAP measurements.

Main Methods:

  • Healthy subjects were divided into four age groups (20-30, 30-40, 40-50, 50-60 years).
  • Sensory action potentials of median and ulnar nerves were recorded using bipolar surface electrodes at the wrist.

Related Experiment Videos

  • Two stimulation methods were compared: 20 mA (averaging 20 stimuli) and 100 mA (single stimulus).

    • Main Results:

    • No statistically significant difference in SAP latency was found between the two methods within each age group.
    • A decrease in latency was observed with supra-maximal stimulation.
    • A statistically significant increase in SAP amplitude was observed with supra-maximal stimulation, especially in older individuals (median nerve: p < 0.001; ulnar nerve: p < 0.0005).

    Conclusions:

    • Supra-maximal stimulation effectively increases sensory action potential amplitude without significantly altering latency.
    • This method may be particularly beneficial for evaluating nerve function in elderly populations.
    • The findings support the use of supra-maximal stimulation for enhanced electrodiagnostic assessment of peripheral nerves.