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Evaluation of opioid use among patients with back disorders and arthritis.

Hayes CJ, Payakachat N, Li C. Evaluation of opioid use among patients with back disorders and arthritis. Quality of life research : an international journal of quality of life aspects of treatment, care and rehabilitation. 2018 Nov 1; 27(11):3021-3035.

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PURPOSE: Long-term opioid use for chronic pain has increased, but limited evidence exists on its benefits. Evaluation of long-term benefits in pain is based on patient-reported measures such as health-related quality of life (HRQoL). This study examined the long-term effects of opioid use on HRQoL and its subdomains in patients with back pain or arthritis by comparing opioid users to non-opioid users for three metrics: (1) any opioid use, (2) duration of opioid use, and (3) average daily morphine equivalent dose. METHODS: A nationally representative sample of cancer-free adults with chronic back pain or arthritis was selected. Using the 12-Item Short Form Survey, HRQoL measures of Mental Component Score (MCS), Physical Component Score (PCS), and individual subdomains were assessed at baseline and 1 year later. Opioid users were matched to non-opioid users in a 1:1 greedy match using propensity scores estimated based on many patient demographics and baseline HRQoL measures. RESULTS: At year one, PCS was significantly lower among opioid users, mostly driven by bodily pain subdomain; MCS was not different. Short-term opioid users ( < 1 month) had higher MCS while long-term users ( 1 month) had lower PCS. Low-dose [ < 20 morphine milligram equivalents (MME)/day] opioid use was associated with lower PCS, while no difference was found between high dose ( 20 MME/day) and non-opioid users. However, most differences were not clinically significant. CONCLUSIONS: Long-term opioid use is not associated with improvements in HRQoL. Clinicians should carefully evaluate the need for opioid use, especially long-term use in managing chronic back pain and arthritis.

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