Roberta T Chow1, Patricia J Armati2. 1. 1 Honorary Research Associate, Brain & Mind Centre, The University of Sydney , Camperdown, New South Wales. 2. 2 Neuroinflammation Group, Brain & Mind Centre, The University of Sydney , Camperdown, New South Wales, Australia .
Abstract
OBJECTIVE: This review examines the evidence of neural inhibition as a mechanism underlying pain relief and anesthetic effect of photobiomodulation (PBM). BACKGROUND: PBM for pain relief has also been used for more than 30 years; however, the mechanism of its effectiveness has not been well understood. METHODS: We review electrophysiological studies in humans and animal models and cell culture studies to examine neural responses to PBM. RESULTS: Evidence shows that PBM can inhibit nerve function in vivo, in situ, ex vivo, and in culture. Animal studies using noxious stimuli indicate nociceptor-specific inhibition with other studies providing direct evidence of local conduction block, leading to inhibited translation of pain centrally. Evidence of PBM-disrupted neuronal physiology affecting axonal flow, cytoskeleton organization, and decreased ATP is also presented. PBM changes are reversible with no side effects or nerve damage. CONCLUSIONS: This review provides strong evidence in neuroscience identifying inhibition of neural function as a mechanism for the clinical application of PBM in pain and anesthesia.
OBJECTIVE: This review examines the evidence of neural inhibition as a mechanism underlying pain relief and anesthetic effect of photobiomodulation (PBM). BACKGROUND:PBM for pain relief has also been used for more than 30 years; however, the mechanism of its effectiveness has not been well understood. METHODS: We review electrophysiological studies in humans and animal models and cell culture studies to examine neural responses to PBM. RESULTS: Evidence shows that PBM can inhibit nerve function in vivo, in situ, ex vivo, and in culture. Animal studies using noxious stimuli indicate nociceptor-specific inhibition with other studies providing direct evidence of local conduction block, leading to inhibited translation of pain centrally. Evidence of PBM-disrupted neuronal physiology affecting axonal flow, cytoskeleton organization, and decreased ATP is also presented. PBM changes are reversible with no side effects or nerve damage. CONCLUSIONS: This review provides strong evidence in neuroscience identifying inhibition of neural function as a mechanism for the clinical application of PBM in pain and anesthesia.
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