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Related Experiment Videos

Anodal block in F-wave studies

S Kirshblum1, P Cai, M V Johnston

  • 1Spinal Cord Injury Services, Kessler Institute for Rehabilitation, West Orange, NJ, USA.

Archives of Physical Medicine and Rehabilitation
|September 28, 1998
PubMed
Summary
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Anodal block was not observed in F-wave studies using needle electrodes, regardless of anode placement. Stimulator reversal is unnecessary for these nerve conduction studies.

Area of Science:

  • Neuroscience
  • Clinical Electrophysiology

Background:

  • Nerve conduction studies (NCS) are crucial for diagnosing neurological disorders.
  • F-wave analysis provides insights into proximal nerve and spinal cord function.
  • The influence of electrode placement on F-wave parameters requires clarification.

Purpose of the Study:

  • To investigate if anode position (proximal vs. distal to cathode) affects F-wave results.
  • To determine the existence of clinical anodal block in F-wave studies.

Main Methods:

  • Prospective study involving 30 healthy volunteers.
  • Median nerve conduction and F-wave studies were performed.
  • A needle cathode and a surface anode (alternately proximal and distal) were used.

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Main Results:

  • F-wave latencies were minimally affected by anode positioning.
  • High correlations were found for F-wave latencies (r=.973 to .988).
  • Differences in F-wave and M-response latencies/amplitudes were clinically insignificant.

Conclusions:

  • Anodal block was not detected in F-wave studies with needle electrode stimulation.
  • Reversing stimulator polarity is not indicated for these specific F-wave studies.
  • Further research with surface electrodes is recommended to validate these findings.