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Related Experiment Videos

Skin temperature side differences--a diagnostic tool for CRPS?

Gunnar Wasner1, Jörn Schattschneider, Ralf Baron

  • 1Klinik für Neurologie, Universitätsklinikum Kiel der Christian-Albrechts-Universität, Niemannsweg 147, 24105 Kiel, Germany.

Pain
|July 6, 2002
PubMed
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Skin temperature differences can reliably diagnose Complex Regional Pain Syndrome type I (CRPS I) by dynamically measuring sympathetic nervous system activity. This method offers high sensitivity and specificity for distinguishing CRPS I from other painful limb conditions.

Area of Science:

  • Neurology
  • Pain Medicine
  • Physiology

Background:

  • Complex Regional Pain Syndrome type I (CRPS I) is a chronic pain condition affecting an extremity after trauma, characterized by sensory, motor, and autonomic dysfunction.
  • Vascular abnormalities in CRPS I are linked to altered sympathetic nervous system activity.
  • Previous research highlighted the role of sympathetic activity in CRPS I vasomotor disturbances.

Purpose of the Study:

  • To evaluate the diagnostic value of skin temperature side differences in CRPS I.
  • To assess these differences in relation to spontaneous sympathetic vasoconstrictor activity.
  • To determine the sensitivity and specificity of skin temperature measurements for CRPS I diagnosis.

Main Methods:

  • Studied 25 patients with CRPS I, 15 with other painful limb conditions, and 20 healthy controls.

Related Experiment Videos

  • Utilized controlled thermoregulation via a thermal suit to modulate sympathetic activity (cooling to activate, warming to abolish).
  • Measured skin temperature using infrared thermometry on affected and unaffected limbs at rest and during sympathetic modulation.

    • Main Results:

    • Minor skin temperature asymmetries were observed at rest in most CRPS I patients.
    • Temperature differences between limbs increased dynamically during controlled thermoregulation, peaking at moderate to high vasoconstrictor activity.
    • Diagnostic sensitivity for CRPS I increased from 32% at rest to 76% during sympathetic modulation, with specificity remaining high (93-100%).

    Conclusions:

    • Unilateral vascular disturbances in CRPS I are critically dependent on sympathetic activity levels.
    • Dynamic skin temperature measurements during sympathetic modulation reliably distinguish CRPS I from other extremity pain syndromes.
    • This method offers a sensitive and specific approach for diagnosing CRPS I.