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Analgesia and Pain Management01:25

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Pain is critical to various clinical pathologies, provoking an urgent need for effective management. Pain, whether acute or chronic, is a complex neurochemical process. Its alleviation depends on the type, with nonopioid analgesics effective for mild to moderate pain, such as musculoskeletal or inflammatory pain, while neuropathic pain responds best to anticonvulsants, tricyclic antidepressants, or serotonin/norepinephrine reuptake inhibitors. For severe acute or chronic pain, opioids may be...
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A Protocol of Manual Tests to Measure Sensation and Pain in Humans
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Pain relief by touch: a quantitative approach.

Flavia Mancini1, Thomas Nash, Gian Domenico Iannetti

  • 1Institute of Cognitive Neuroscience, University College London, London, UK Department of Neuroscience, Physiology and Pharmacology, University College London, London, UK Division of Medicine, University College London, London, UK.

Pain
|December 24, 2013
PubMed
Summary
This summary is machine-generated.

Touch applied within the same skin area (dermatome) effectively reduces pain perception. This pain relief diminishes as the distance between touch and pain increases, revealing a spatial organization in touch-pain interactions.

Keywords:
AnalgesiaPainReliefSignal detection theorySpaceTouch

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Area of Science:

  • Neuroscience
  • Pain perception
  • Somatosensation

Background:

  • Pain relief via touch is a known phenomenon.
  • Segmental touch (within the same body area) offers greater pain relief than extrasegmental touch.
  • The precise spatial organization of touch-pain interactions within a single dermatome remains unclear.

Purpose of the Study:

  • To investigate how and where touch modulates laser-evoked pain perception within a human dermatome.
  • To determine the spatial characteristics of touch-pain interactions at the intrasegmental level.

Main Methods:

  • Two experiments were conducted using laser-evoked stimuli and tactile stimulation.
  • Pain perception was assessed via intensity ratings, qualitative descriptors, and signal detection measures (sensitivity and response bias).
  • The distance between tactile and laser stimuli within a dermatome was systematically varied.

Main Results:

  • Concurrent touch significantly reduced perceived pain intensity (analgesia).
  • Touch decreased sensitivity to laser stimulation, suggesting impaired Aδ pathway information processing.
  • A bias towards perceiving laser stimuli as less painful was observed, which decreased linearly with increasing stimulus distance.

Conclusions:

  • Touch-pain interactions exhibit a clear spatial organization within a single dermatome.
  • Intrasegmental tactile stimulation can modulate pain processing, with effects dependent on spatial proximity.
  • Findings provide evidence for localized inhibitory mechanisms in touch-pain modulation.