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Opioid-induced hyperalgesia 

Opioid-induced hyperalgesia
Opioid-induced hyperalgesia

Kirsty Bannister

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date: 24 September 2021

The landmark paper discussed in this chapter is ‘Opioid-induced hyperalgesia: Abnormal or normal pain?’, published by Simonnet and Rivat in 2003. Morphine remains the analgesic of choice for those patients suffering moderate-to-severe pain, but it is increasingly recognized that worsening pain can be associated with chronic opioid consumption—the so-called phenomenon of opioid-induced hyperalgesia (OIH). This paper combined knowledge from clinical studies and experimental evidence from animal research in order to delve deeper into the workings of OIH and ask whether it represented normal or abnormal pain. The authors, intrigued by evidence indicating that exogenous opioids could activate both inhibitory and facilitatory pain systems, looked to reassess the role of such enhancement in pain sensitivity. As the debate regarding the very existence of OIH rages on, we pain specialists can take comfort in the knowledge that for many before us, over a decade ago, the reality of OIH was never in question.

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