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Dynamic F waves in neurogenic claudication.

S F London1, J D England

  • 1Department of Neurology, University of Colorado Health Sciences Center, Denver 80262.

Muscle & Nerve
|May 1, 1991
PubMed
Summary
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Neurogenic claudication symptoms may stem from temporary nerve conduction issues. F wave exercise testing shows dynamic changes, aiding diagnosis of this condition.

Area of Science:

  • Neurophysiology
  • Neurology
  • Clinical Electrophysiology

Background:

  • Neurogenic claudication is a common cause of leg pain during walking.
  • Its dynamic neurological symptoms are not fully understood.
  • Electrophysiological studies can help elucidate the underlying pathophysiology.

Purpose of the Study:

  • To investigate the utility of F wave analysis in diagnosing neurogenic claudication.
  • To explore the physiological basis of dynamic neurological symptoms in neurogenic claudication.

Main Methods:

  • Serial F waves were recorded before and after ambulation in two patients.
  • F wave parameters including latency and elicitability were analyzed.
  • Changes were assessed dynamically over a short period post-exercise.

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Main Results:

  • Both patients exhibited dynamic changes in F wave parameters post-exercise.
  • These changes included F wave unelicitability and increased latencies.
  • The observed changes were rapidly reversible within 15 minutes.

Conclusions:

  • Dynamic changes in F waves suggest exercise-induced ischemic conduction block and slowing in proximal motor axons.
  • These electrophysiological findings may explain the transient neurological symptoms of neurogenic claudication.
  • F wave exercise testing could be a valuable diagnostic tool for neurogenic claudication.