Cited by 473Pain Mechanisms and TreatmentsPain Management and TreatmentMusculoskeletal pain and rehabilitation

When does acute pain become chronic?

Open access
Voscopoulos, C, Lema, M·2010·British Journal of Anaesthesia

Abstract

The transition from acute to chronic pain appears to occur in discrete pathophysiological and histopathological steps. Stimuli initiating a nociceptive response vary, but receptors and endogenous defence mechanisms in the periphery interact in a similar manner regardless of the insult. Chemical, mechanical, and thermal receptors, along with leucocytes and macrophages, determine the intensity, location, and duration of noxious events. Noxious stimuli are transduced to the dorsal horn of the spinal cord, where amino acid and peptide transmitters activate second-order neurones. Spinal neurones then transmit signals to the brain. The resultant actions by the individual involve sensory-discriminative, motivational-affective, and modulatory processes in an attempt to limit or stop the painful process. Under normal conditions, noxious stimuli diminish as healing progresses and pain sensation lessens until minimal or no pain is detected. Persistent, intense pain, however, activates secondary mechanisms both at the periphery and within the central nervous system that cause allodynia, hyperalgesia, and hyperpathia that can diminish normal functioning. These changes begin in the periphery with upregulation of cyclo-oxygenase-2 and interleukin-1β-sensitizing first-order neurones, which eventually sensitize second-order spinal neurones by activating N-methyl-d-aspartic acid channels and signalling microglia to alter neuronal cytoarchitecture. Throughout these processes, prostaglandins, endocannabinoids, ion-specific channels, and scavenger cells all play a key role in the transformation of acute to chronic pain. A better understanding of the interplay among these substances will assist in the development of agents designed to ameliorate or reverse chronic pain.

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Crossref · 10.1093/bja/aeq323

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Authors
Voscopoulos, C., & Lema, M.
Affiliations
University at Buffalo, State University of New York (US)
Venue
British Journal of Anaesthesia
Publisher
Elsevier BV
Published
2010-12
Volume
105
Pages
i69-i85
ISSN
0007-0912 (ISSN-L)
OpenAlex
W2124105819
Cited by
473
References
207
Citations by year
2026: 16 · 2025: 29 · 2024: 26 · 2023: 39 · 2022: 38 · 2021: 33 · 2020: 38 · 2019: 27 · 2018: 29 · 2017: 36 · 2016: 48 · 2015: 35 · 2014: 23 · 2013: 27 · 2012: 16
FWCI
1.78
Type
journal article
Language
en
Open access
Locations
  • British Journal of Anaesthesia (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Physiology › Pain Mechanisms and Treatments
  • Health Sciences › Medicine › Anesthesiology and Pain Medicine › Pain Management and Treatment
  • Health Sciences › Medicine › Pharmacology › Musculoskeletal pain and rehabilitation
Keywords
acute pain, chronic pain, pain transition, nociception, dorsal horn, spinal cord, cyclooxygenase-2, IL-1β, NMDA receptor, microglia, allodynia, hyperalgesia, hyperpathia, prostaglandins, endocannabinoids, ion channels, pain modulation, analgesic drug development
MeSH terms
Acute Disease, Chronic Disease, Humans, Neural Pathways, Neuralgia, Neuronal Plasticity, Pain, Pain, Postoperative, Postoperative Pain, Signal Transduction, Disease Progression

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