Pain physician
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Review
Monitoring opioid adherence in chronic pain patients: assessment of risk of substance misuse.
Use of opioids for chronic non-cancer pain (CNCP) has increased in recent years because this pain had been undertreated. There was also a simultaneous increase in misuse and abuse of opioids. Deaths due to such abuse and misuse also have risen as seen in the many reports published every day in local papers as well as in the medical literature. So, it is imperative that patients who are prescribed these medications be monitored for adherence so misuse and abuse can be curtailed and opioids are available to those who genuinely need them for chronic pain control. There are various screening tools available to monitor such adherence, and there is an abundance of literature about it in addiction and psychiatric medicine. There is, though, a paucity of such literature as applied to pain medicine. ⋯ We found 52 publications, of which 22 met the criteria to be included in this manuscript. We found only one study that was prospective, and compared the various screening tools that are available to monitor opioid adherence. In the majority of the studies the number treated was small. There was not a single screening tool that can be applied universally to all patients who are on opioid therapy for chronic non-cancer pain.
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Opioids have been utilized for thousands of years to treat pain and their use continues to escalate. It is estimated that 90% of the patients who present to pain centers and receive treatment in such facilities are on opioids. However, in contrast to increasing opioid use and the lack of evidence supporting long-term effectiveness in chronic non-cancer pain, is the escalating misuse of prescription opioids, including abuse and diversion. There is also uncertainty about the incidence and clinical salience of multiple, poorly characterized adverse drug events, including endocrine dysfunction, immunosuppression, infectious disease, opioid-induced hyperalgesia, overdoses, deaths, and psychosocial and economic implications. ⋯ This comprehensive review illustrates the lack of literature on long-term opioid therapy; thus, opioid therapy should be provided with great restraint and caution, based on the weak evidence available.
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Therapeutic use, overuse, abuse, and diversion of controlled substances in managing chronic non-cancer pain continue to be an issue for physicians and patients. The challenge is to eliminate or significantly curtail abuse of controlled prescription drugs while still assuring the proper treatment of those patients. Some physicians are apprehensive regarding the use of chronic opioid therapy in chronic non-cancer pain due to a perceived lack of proven evidence, the misuse of opioids, tolerance, dependence, and hyperalgesia. ⋯ UDT can provide tools for tracking patient compliance and expose possible drug misuse and abuse. UDT is one of the major tools of adherence monitoring in the assessment of the patient's predisposition to, and patterns of, drug misuse/abuse--a vital first step towards establishing and maintaining the safe and effective use of opioid analgesics in the treatment of chronic pain. This comprehensive review provides the role of UDT in monitoring chronic opioid therapy along with reliability and accuracy, appropriate use, overuse, misuse, and abuse.
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The present evidence illustrates that the placebo effect depends on a variety of neurochemical and neurophysiological mechanisms, which are measurable and modifiable. However, the placebo response is inexorably tied to the treatment context. All medical treatments take place in a particular context; this context includes the therapist's attitudes, psychosocial factors affecting the therapeutic relationship, and the patient's mindset. ⋯ On the contrary, they should try to potentiate it, since this is a very important clinical implication. From the research perspective, the emerging knowledge of placebo continues to cast doubts on the appropriateness of the double-blind placebo-control design in assessing efficacy of treatment--specifically involving interventional techniques or surgery. The research setting itself may introduce nocebo hyperalgesia.
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Opioid-induced hyperalgesia (OIH) is defined as a state of nociceptive sensitization caused by exposure to opioids. The condition is characterized by a paradoxical response whereby a patient receiving opioids for the treatment of pain could actually become more sensitive to certain painful stimuli. The type of pain experienced might be the same as the underlying pain or might be different from the original underlying pain. ⋯ Clinicians should suspect OIH when opioid treatment's effect seems to wane in the absence of disease progression, particularly if found in the context of unexplained pain reports or diffuse allodynia unassociated with the original pain, and increased levels of pain with increasing dosages. The treatment involves reducing the opioid dosage, tapering them off, or supplementation with NMDA receptor modulators. This comprehensive review addresses terminology and definition, prevalence, the evidence for mechanism and physiology with analysis of various factors leading to OIH, and effective strategies for preventing, reversing, or managing OIH.