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Related Experiment Videos

Effects of elevation on nerve function in an acute upper extremity nerve compression model.

L K Chidgey1, R M Szabo, B Kolack

  • 1Department of Orthopaedics, University of California, Davis Medical Center, Sacramento.

Journal of Orthopaedic Research : Official Publication of the Orthopaedic Research Society
|January 1, 1989
PubMed
Summary

Lowering the hand to heart level may not reverse nerve function decline in carpal tunnel syndrome, even with moderate pressure. This suggests limited blood flow recovery, potentially leading to nerve damage.

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Area of Science:

  • Neuroscience
  • Orthopedics
  • Biomedical Engineering

Background:

  • Carpal tunnel syndrome (CTS) is a common condition characterized by nerve compression.
  • Understanding the physiological response to elevated carpal tunnel pressure is crucial for managing CTS.
  • Positional changes, like lowering the hand, are often advised for symptom relief.

Purpose of the Study:

  • To investigate the effect of lowering the hand to heart level on nerve function under externally induced carpal tunnel pressure.
  • To determine if this maneuver can reverse or mitigate nerve dysfunction when carpal tunnel pressure is moderately elevated.

Main Methods:

  • External compression applied to the palmar wrist to elevate carpal tunnel pressure to 50 mm Hg in healthy volunteers.
  • Continuous monitoring of carpal tunnel pressure using a slit catheter.

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  • Evaluation of sensory and motor nerve conduction parameters (latencies, amplitudes) at regular intervals.
  • Assessing the impact of lowering the hand from maximum elevation to heart level on nerve function.

    • Main Results:

    • A 50% decrease in sensory amplitude, correlating with subjective sensory changes, was used as a threshold.
    • Lowering the hand to heart level did not consistently reverse the decline in sensory amplitude.
    • Four subjects showed transient improvement, while four showed no change, with all eventually progressing to a complete sensory block.
    • Sustained reversal of declining nerve function was not observed in most subjects.

    Conclusions:

    • Moderately elevated carpal tunnel pressure can lead to significant nerve dysfunction.
    • Lowering the hand to heart level may be insufficient to restore local tissue blood flow and reverse nerve function decline once it has significantly decreased.
    • This suggests that positional changes alone might not prevent impending nerve damage in cases of significant carpal tunnel pressure elevation.