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Medline ® Abstract for Reference 114

of 'Prevention and management of side effects in patients receiving opioids for chronic pain'

Opioid-induced hyperalgesia (OIH): a real clinical problem or just an experimental phenomenon?
Eisenberg E, Suzan E, Pud D
J Pain Symptom Manage. 2015 Mar;49(3):632-6. Epub 2014 Aug 13.
Although opioid-induced hyperalgesia (OIH) is mentioned as a potential cause of opioid dose escalation without adequate analgesia, true evidence in support of this notion is relatively limited. Most studies conducted in the context of acute and experimental pain, which seemingly demonstrated evidence for OIH, actually might have measured other phenomena such as acute opioid withdrawal or tolerance. OIH studies in patients with chronic pain have used various experimental pain models (such as cold pain tolerance or heat pain intensity). Therefore, the fact that they have yielded inconsistent results is hard to interpret. Thus far, with the exception of a few clinical case reports on OIH in patients with cancer pain and one prospective study in patients with chronic neuropathic pain, evidence for OIH in patients with chronic or cancer-related pain is lacking. Whether experimental pain models are necessary for establishing the clinical diagnosis of OIH, and which specific model is preferred, are yet to be determined.
Rappaport Faculty of Medicine, Technion-Israel Institute of Technology, Haifa, Israel; Institute of Pain Medicine, Rambam Health Care Campus, Haifa, Israel. Electronic address: e_eisenberg@rambam.health.gov.il.