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Related Experiment Videos

Painful peripheral states and sympathetic blocks.

L Loh, P W Nathan

    Journal of Neurology, Neurosurgery, and Psychiatry
    |July 1, 1978
    PubMed
    Summary

    Sympathetic nerve blocks effectively relieved chronic pain and hyperpathia, suggesting a link to noradrenaline release. This indicates the sympathetic system

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    Area of Science:

    • Pain research
    • Neuroscience
    • Pharmacology

    Background:

    • Chronic pain conditions often involve complex mechanisms.
    • The role of the sympathetic nervous system in pain is not fully understood.
    • Hyperpathia, an abnormal sensitivity to stimuli, is a common feature of neuropathic pain.

    Observation:

    • Sympathetic nerve blocks, using local anesthesia or guanethidine, were performed in patients with chronic pain.
    • Pain relief was strongly correlated with the presence of hyperpathia.
    • Blocks were ineffective unless hyperpathia was present, but relieved both pain and hyperpathia when it was.

    Findings:

    • Sympathetic blocks provide significant pain relief in chronic pain states characterized by hyperpathia.
    • The effectiveness of guanethidine blocks suggests peripheral noradrenaline emission maintains pain and hyperpathia.
    • These findings highlight the critical involvement of the sympathetic nervous system in certain chronic pain conditions.

    Implications:

    • Targeting the sympathetic nervous system may be a viable strategy for managing chronic pain with hyperpathia.
    • Understanding the role of peripheral noradrenaline is crucial for developing novel pain therapies.
    • Further research into the sympathetic system's contribution to pain and hyperpathia is warranted.

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