Chronic Noncancer Pain Research Articles

Transcranial Direct Current Stimulation Reduces Pressure Pain Sensitivity in Patients With Noncancer Chronic Pain

Objectives: Noncancer chronic pain is a clinical challenge because pharmacological treatment often fails to relieve pain. Transcranial direct current stimulation (tDCS) is a treatment that could have the potential for pain relief and improvement in quality of life. However, there is a lack of clinical trials evaluating the effects of tDCS on the pain system. The aim of the present study was to evaluate the effect of 5 days of anodal tDCS treatment on the pain system in patients with chronic noncancer pain using quantitative sensory testing and quality of life questionnaires: (1) Brief Pain Inventory-short form, (2) European Organization for Research and Treatment of Life Questionnaire-C30, and (3) Hospital Anxiety Depression Scale. Methods: Eleven patients with noncancer chronic pain (51 ± 13.6 y old, 5M) participated in the study. Anodal tDCS was applied for 5 consecutive days, followed by sham stimulation after a washout period of at least 2 weeks. Pressure pain thresholds and pain tolerance thresholds (PTT) were assessed in different body regions on days 1 and 5. Results: Anodal tDCS appeared to maintain PTT at C5 (clavicle) on day 5, but sham stimulation decreased PTT (P = 0.007). In addition, anodal tDCS increased PTT compared with sham at day 5 at Th10 ventral dermatomes (P = 0.014). Both anodal and sham tDCS decreased the Brief Pain Inventory-short form total and interference scores, and the European Organization for Research and Treatment of Life Questionnaire-C30 fatigue score, but no interaction effect was observed. Conclusion: This study adds to the evidence in the literature that tDCS may be a potential therapeutic tool for the management of noncancer chronic pain.

Assessing the feasibility of the GOTT (Gabapentinoid and Opioid Tapering Toolkit) in a primary care setting in North-East England

Objective To assess the feasibility and possible impacts of implementation of systematic non-pharmacological interventions to reduce the level of prescribing of opioid and gabapentinoid analgesics for chronic non-cancer pain (CNCP), particularly high-dose prescriptions, through a proof-of-concept study in a deprived area (second lowest decile) primary care practice in North-East England. Participant Twenty-five primary care staff (clinical and non-clinical) of which 18 clinicians received the intervention. Intervention used in this study practice known as GOTT (Gabapentinoid and Opioid Toolkit) All clinicians received an educational skills programme to support patient pain self-management, tailored on the clinicians’ self-assessment of their learning needs, embedding both clinician skill learning and patient self-care resources for rapid access within consultations into a GP clinical management computer system. Outcome measures Clinical staff completed questionnaires before and after the GOTT intervention to assess levels of knowledge and confidence in their own skills to support chronic pain self-management across several domains. Prescription data were used to measure changes in opioid and gabapentinoid prescribing at the practice across the 12-month intervention and 30-month follow-up period. Results Prescribing of opioid and gabapentinoid/pregabalin decreased substantially in the practice across the intervention period (c. 90% in high-dose opioid [ p = .0118], and 15% gabapentin/pregabalin prescriptions, respectively), over a one-year period during the COVID-19 pandemic. Follow-up analysis showed 100% and c.50% reductions, respectively, in December 2022. The questionnaire data showed an increase in clinician confidence in skills to enable self-management over the intervention period, overall ( p = .044) and, specifically across three of the five domains measured: supporting behavioural change ( p = .028), supporting self-care ( p = .008), and managing difficult consultations ( p = .011). Conclusion The GOTT intervention program provided some initial evidence of a proof-of-concept for the implementation of a systematic non-pharmacological pain management skills and resources programme addressing lack of confidence in skills to introduce and support self-management and reduce use of strong opioids and gabapentinoids.

Interventions to reduce opioid use for patients with chronic non-cancer pain in primary care settings: A systematic review and meta-analysis.

This systematic review and meta-analysis aimed to assess interventions to reduce opioid use for patients with chronic non-cancer pain (CNCP) versus usual care or active controls in primary care settings. In this registered study (PROSPERO: CRD42022338458), we searched MEDLINE, Embase PsycInfo, CINAHL, and Cochrane Library from inception to December 28th 2021, and updated on Dec 14th 2023 for randomized controlled trials (RCTs) and cohort studies with no restrictions. Methodological quality was assessed using the Cochrane Risk of Bias tool for RCTs and Newcastle Ottawa Scale for cohort studies. Primary outcomes included mean reduction in morphine equivalent daily dose (reported as mean differences [MDs] mg/day; 95% confidence intervals [95%CIs]) and/or opioid cessation proportion. Secondary outcomes were mean changes in pain severity (reported as standardized mean difference [SMDs]; 95%CIs) and (serious) adverse events. Meta-analyses were performed using random-effects models. We identified 3,826 records, of which five RCTs (953 participants) and five cohort studies (901 participants) were included. Overall, opioid dosage was significantly reduced in intervention groups compared to controls (MD: -28.63 mg/day, 95%CI: -39.77 to -17.49; I2 = 31.25%; eight studies). Subgroup analyses revealed significant opioid dose reductions with mindfulness (MD: -29.36 mg/day 95%CI: -40.55 to -18.17; I2 = 0.00%; two trials) and CBT-based multimodalities (MD: -41.68 mg/day; 95%CI: -58.47 to -24.89; I2 = 0.00%; two cohort studies), respectively, compared to usual care. No significant differences were observed in opioid cessation (Odds ratio: 1.10, 95%CI: -0.48 to 2.67, I2 = 58.59%; two trials) or pain severity (SMD: -0.13, 95%CI: -0.37 to 0.11; I2 = 33.51%; three trials). Adverse events were infrequently examined, with withdrawal symptoms commonly reported. The studied interventions were effective in reducing opioid dosage for people with CNCP in primary care. They highlighted the importance of multidisciplinary collaboration. Large-scale RCTs measuring the long-term effects and cost of these interventions are needed before their implementation.

The prescribing of opioids for chronic noncancer pain in the menopausal and postmenopausal population: a drug utilisation study in the United Kingdom.

Opioid use for chronic noncancer pain (CNCP) is consistently higher in menopausal/postmenopausal women than in younger women or men, elevating their risk of opioid-related adverse health outcomes. Since pain severity increases with hormonal changes accompanying menopause, these women should be a focus of opioid stewardship efforts. To examine opioid prescribing trends for CNCP in menopausal/postmenopausal women diagnosed with a musculoskeletal condition. Population-based drug utilisation study using IQVIA Medical Research Data UK. Annual opioid prescribing incidence, prevalence, and average duration of use were calculated for a cohort of women aged 50-79 with musculoskeletal conditions newly diagnosed between 2010-2021. Specific results were stratified by age, pain indication, and Townsend score. From 2010 to 2021, incident prescribing rates of opioids increased in women aged 50-54 (161.4 [95% CI 149.7-174.0] per 1000 PYAR in 2010 to 239.6 [95% CI 211.7-271.2] per 1000 PYAR in 2021); these women discontinued opioid use faster (~1 year) than older age groups (~2 years). Overall, opioid prescribing prevalence decreased from 23% in 2010 to 14% in 2021, and average opioid use duration decreased from 3 years to 1 year (2010 - post-2017) in women aged 50-79. The overall observed decrease in prevalence and average duration of opioid use is encouraging. Incident prescriptions are rising in women aged 50-54 and those with fibromyalgia while remaining steady in women aged 55-79. Understanding the impact of menopause/post-menopause on opioid use trends is important for effective opioid stewardship.

Treating Anxiety-Based Cognitive Distortions Pertaining to Somatic Perception for Better Chronic Pain Outcomes: A Recommendation for Better Practice in the Present Day and the Cyber Age of Medicine.

Anxiety-based cognitive distortions pertaining to somatic perception (ABCD-SPs)-primarily catastrophizing, fear avoidance, and kinesiophobia-have been repeatedly linked to worsening chronic, non-cancer pain (CNCP) outcomes of increased disability, amplified pain, ineffective opioid use, and opioid misuse. Several studies have suggested that treating ABCD-SPs can improve pain outcomes, yet identification and targeting of ABCD-SPs are not part of the standard medical pain assessment and treatment plan. Utilizing a narrative review of proposed mechanisms, published patient perspectives, and study correlations connecting these cognitive distortions with CNCP outcomes, an approach for better practice in the delivery of standard medical CNCP care can be deduced and formulated into a Belief and Behavior Action Plan (BBAP) for medical clinicians treating CNCP to implement into initial and maintenance care planning. These recommendations require relatively few resources to implement and have the potential to disseminate more effective CNCP treatment on a large scale now and in the future with the new frontier of cognitive computing in medicine.

Exceeding the guideline-recommended maximum daily dose of opioids for long-term treatment of non-cancer pain in Germany – a large retrospective observational study

BackgroundHigh-dose long-term opioid therapy (LTOT) has been associated with increased mortality and hospitalizations. Therefore, the evidence-based German guideline on LTOT for chronic non-cancer pain (CNCP) recommends to only exceed the maximum daily dose (MDD) of opioids in exceptional cases. This study aimed to determine the portion of LTOT patients who exceeded the guideline-recommended MDD and identify predictors of exceeding in administrative claims data.MethodsThe retrospective observational analysis of opioid prescriptions in patients receiving LTOT for CNCP was based on administrative claims by a large German statutory health insurance company. Patients with at least two quarters of opioid prescriptions between January 2018 and June 2019 were included and followed up for two years. Predictors were identified by logistic regression. In addition, the number of patients still in opioid therapy and the extent of exceeded MDDs were analyzed over time.ResultsThe sample consisted of 113,475 patients. Overall, 10.5% of the patients exceeded the guideline-recommended MDD averaged over the observation period. Strong predictors for exceeding the MDD were receiving opioid prescriptions from > 7 physicians (OR = 7.66, p < .001), receiving predominantly strong opioids (OR = 6.79, p < .001) and receiving opioids for at least one year prior to inclusion (OR = 5.35, p < .001). Within the non-exceeding group, 28.1% discontinued opioid therapy. In contrast, 9.9% of patients in the exceeding group discontinued opioid therapy, whereas the vast majority remained on treatment until the end of the observation period. Furthermore, a slight increase in prescribed doses was observed over time.ConclusionsThe results indicate that a moderate proportion of patients exceeded the guideline-recommended MDD. However, certain patient groups were more likely to receive high doses. This applied in particular to those who were already on treatment at the time of inclusion and continued to receive opioids until the end of the observation period. Further research should examine whether the continuous opioid therapy among the patients with exceeding the guideline-recommended MDD might be related to specific indications, a lack of therapeutic options or avoidance of withdrawal.Trial registrationGerman Clinical Trials Register (drks.de/search/en). Identifier: DRKS00024854. Registered 28 April 2021.

Spiritual care provided by a physician in a pain management clinic: a bidirectional relationship between chronic non-cancer pain and spirituality

Spiritual care provided by a physician in a pain management clinic: a bidirectional relationship between chronic non-cancer pain and spirituality

Is general practitioner involvement in the initiation of opioids for chronic non-cancer pain associated with opioid dose and concurrent drug use?

Objective Is the involvement of the regular general practitioner (GP) in the decision to initiate opioid treatment for chronic non-cancer pain (CNCP) associated with two main risk factors for serious adverse events: increased opioid dose and the concomitant use of prescribed benzodiazepines or benzodiazepine-related medications? Design and setting An anonymous web-based survey was conducted in the county of Rogaland, Norway, during the spring of 2021. Subjects GPs who self-reported applying at least once for reimbursement of opioids prescribed to treat CNCP. They were asked to answer the survey based on the last patient for whom they recalled submitting a reimbursement application. Main outcome measures 1) Total opioid dose in daily oral morphine equivalents (OMEQ). 2) Concurrent use of benzodiazepines and/or benzodiazepine-related drugs. Results The daily opioid dose was lower when the surveyed GPs initiated the opioid treatment (36 OMEQ, n = 25), than when others had initiated the treatment (108 OMEQ, n = 31, p = 0.001). For concurrent use of benzodiazepine or benzodiazepine-related drugs, no significant difference was found (33%, n = 9 with GP involvement vs. 47%, n = 16, p = 0.279 with no GP involvement). Conclusions GP involvement in the initiation of opioid medication for CNCP was associated with a lower opioid dose being prescribed. Implications GP involvement in the initiation of opioid prescriptions may facilitate safer prescribing.

Multidimensional Analysis of Quality of Life in Patients with Chronic Non-Cancer Pain and Short- and Long-Term Intrathecal Analgesic Therapy.

Background: Intrathecal drug delivery (IDD) is part of the fourth analgesic step. Evidence on the quality of life of patients with refractory chronic non-cancer pain (CNCP) using these devices and their long-term outcomes is scarce. This study aims to evaluate patients with IDD to assess their HRQoL. Additionally, the study seeks to understand the patients' satisfaction with the treatment and changes in pain magnitude over time. Methods: Adult patients with CNCP and intrathecal drug delivery systems (IDDS) were included. The study population was divided into two groups: less than and more than 15 years of treatment. HRQoL was analyzed using validated questionnaires. Pain reduction was assessed using the visual analog scale (VAS), and treatment satisfaction was evaluated using the Patient Global Impression of Improvement scale. Results: The results indicate a poor HRQoL in IDD patients, with better scores in the group with ≥15 years of treatment. Pain reduction was similar in both groups, and patients reported a positive satisfaction level with the treatment. Conclusions: HRQoL in CNCP patients is severely affected. Long-term IDD patients have a similar or even better HRQoL in some respects compared to those with shorter follow-ups. IDD patients experienced pain reduction, with most feeling better or much better.

Predictive Model for Opioid Use Disorder in Chronic Pain: A Development and Validation Study.

There are several questionnaires for the challenge of anticipating opioid use disorder (OUD). However, many are not specific for chronic non-cancer pain (CNCP) or have been developed in the American population, whose sociodemographic factors are very different from the Spanish population, leading to scarce translation into clinical practice. Thus, the aim of this study is to prospectively validate a predictive model for OUD in Spanish patients under long-term opioids. An innovative two-stage predictive model was developed from retrospective (n = 129) and non-overlapping prospective (n = 100) cohorts of real-world CNCP outpatients. All subjects used prescribed opioids for 6 or more months. Sociodemographic, clinical and pharmacological covariates were registered. Mu-opioid receptor 1 (OPRM1, A118G, rs1799971) and catechol-O-methyltransferase (COMT, G472A, rs4680) genetic variants plus cytochrome P450 2D6 (CYP2D6) liver enzyme phenotypes were also analyzed. The model performance and diagnostic accuracy were calculated. The two-stage model comprised risk factors related to OUD (younger age, work disability and high daily opioid dose) and provided new useful information about other risk factors (low quality of life, OPRM-G allele and CYP2D6 extreme phenotypes). The validation showed a satisfactory accuracy (70% specificity and 75% sensitivity) for our predictive model with acceptable discrimination and goodness of fit. Our study presents the results of an innovative model for predicting OUD in our setting. After external validation, it could represent a change in the paradigm of opioid treatment, helping clinicians to better identify and manage the risks and reduce the side effects and complications.

Association of cannabis use with patient-reported pain measures among adults with chronic pain in US states with medical cannabis programs

IntroductionMost Americans live in a state that has legalized cannabis as a medical treatment for pain, but it is unclear how chronic pain intensity relates to cannabis use. Our objective...

Evolution of Fentanyl Prescription Patterns and Administration Routes in Primary Care in Salamanca, Spain: A Comprehensive Analysis from 2011 to 2022.

(1) Background: The escalating use of opioids contributes to social, health, and economic crises. In Spain, a notable surge in the medical prescription of opioids in recent years has been observed. The aim of this work was to assess the consumption rate of fentanyl, categorised by the different administration routes, in Primary Care in the province of Salamanca (Spain) spanning the years 2011 to 2022, and to compare it with the national trend and with data from the US. (2) Methods: Doses per inhabitant per day (DHD) were calculated, and interannual variations, as well as consumption rates, were subject to thorough analysis. (3) Results: The prevalence of fentanyl use in Salamanca has doubled from 1.21 DHD in 2011 to 2.56 DHD in 2022, with the transdermal system (TD) as the predominant administration route. This upward trajectory mirrors the national trend, yet the rise in fentanyl use is markedly lower than the reported data in the US. This finding may be attributed to an ageing population and potentially inappropriate fentanyl prescriptions, i.e., for the management of chronic non-cancer pain and other off-label prescriptions. (4) Conclusions: The use of fentanyl in Salamanca, particularly through transdermal systems, doubled from 2011 to 2022, aligning with the national trend. Preventive measures are imperative to prevent fentanyl misuse and moderate the observed escalation in consumption rates.

Insomnia among patients with chronic pain: A retrospective study.

Insomnia can coexist with chronic pain and is a major cause of rapidly increasing medical expenses. However, insomnia has not been fully evaluated in patients with chronic pain. This retrospective study aimed to identify the risk factors for insomnia in patients with chronic non-cancer pain. A total of 301 patients with chronic non-cancer pain were enrolled. Patients with the Athens insomnia scale scores ≥ 6 and < 6 were classified into insomnia (+) and insomnia (-) groups, respectively. All patients completed self-report questionnaires as part of their chronic pain treatment approach. Univariate and multivariate analyses were performed to predict insomnia. We found that 219 of 301 (72.8%) patients met the AIS criteria for insomnia. Significant differences were depicted between patients with and without insomnia in terms of body mass index, numeric rating scale, pain catastrophizing scale, hospital anxiety, and depression scale (HADS), pain disability assessment scale, EuroQol 5 dimension (EQ5D), and pain self-efficacy questionnaire. Multiple regression analysis identified the numeric rating scale, HADS, and EQ5D scores as factors related to insomnia in patients with chronic non-cancer pain. Anxiety, depression, and disability were associated with a greater tendency toward insomnia. HADS and EQ5D scores are useful screening tools for preventing insomnia in patients with chronic non-cancer pain.

Recommendations for managing adults with chronic non-cancer pain in primary care: A systematic clinical guideline review.

Chronic non-cancer pain (CNCP) is a leading driver of disability. Primary care clinicians treat most patients with CNCP. Yet, they are often unable to identify appropriate pain treatments, mainly due to concerns about the safety and effectiveness of available medications. Clinical practice guidelines (CPGs) can be useful tools to guide primary care clinicians in selecting pain treatments based on the best available evidence. To undertake a systematic review of CPGs that address the management of adults with CNCP, regardless of underlying condition type, in primary care. We systematically reviewed and synthesised current CPGs for managing adults with CNCP in primary care (2013-2023). We followed a stepwise systematic process to synthesise key CPG recommendations: extracted and analysed each recommendation, synthesised by compiling similar recommendations using a thematic analysis approach, and assessed the strength of CPG recommendations to create a final, unified set of recommendations. We focused on identifying CPGs containing recommendations on the following topics: (a) opioid pain management, (b) non-opioid pharmacological pain management, (c) non-pharmacological pain management, and (d) patient-centred communication around pain management, prevention, and organisation of care. We included 13 CPGs, 8 of which focused solely on use of opioids, emphasising the lack of long-term effectiveness and safety concerns, being mainly based on the expert consensus. As an exception, high-quality evidence recommended referring patients with suspected opioid use disorder to specialist addiction services for medication-assisted treatment. Recommendations for non-opioid pain management were often contradictory and based on the expert consensus. Patient-centred pain management combined with exercise-based interventions and psychological therapies are appropriate strategies for managing patients with CNCP. Most CPGs focused on opioid management, with contradictory recommendations for non-opioid management based on low-quality evidence. Additional research is needed to strengthen the evidence for using non-opioid and non-pharmacological interventions to manage patients with CNCP.

Choosing Wisely in Physical Medicine and Rehabilitation: Developing Canadian Recommendations for Resource Stewardship

ABSTRACT Choosing Wisely Canada (CWC) aims to reduce potentially harmful or unnecessary diagnostic investigations and practices in health care delivery. A committee of the Canadian Association of Physical Medicine &amp; Rehabilitation (PM&amp;R) surveyed the general membership seeking suggestions on new or revised PM&amp;R CWC recommendations. Draft recommendations were revised and refined with an emphasis on resource stewardship and alignment with the CWC mission. The updated 2023 CWC recommendations for PM&amp;R are to avoid: (1) investigating and treating asymptomatic bacteriuria in patients with neurogenic bladder; (2) recommending more than a brief period of physical and cognitive rest after mild traumatic brain injury; (3) starting opioid treatment for chronic noncancer pain without exhausting other approaches; (4) ordering diagnostic imaging for low back pain in the absence of red flags; (5) repeating injections without evaluating patients’ responses to them; and, (6) recommending carpal tunnel release without first confirming nerve entrapment with electrodiagnostic studies or ultrasonography. We present unique implementation tools to equip practitioners with quality improvement strategies to adopt these recommendations into their practices. Future work will include developing recommendations that consider planetary health co-benefits, creating knowledge translation tools, and assessing the impact of recommendation adoption into clinical practice.

EHealth-Integrated Psychosocial and Physical Interventions for Chronic Pain in Older Adults: Scoping Review.

Chronic noncancer pain (CNCP) is highly present among older adults, affecting their physical, psychological, and social functioning. A biopsychosocial multimodal approach to CNCP management is currently extensively suggested by international clinical practice guidelines. Recently, the growing development and application of eHealth within pain management has yielded encouraging results in terms of effectiveness and feasibility; however, its use among the older population remains underexamined. The overall aim of this scoping review was to systematically map existing literature about eHealth multimodal interventions (including both physical and psychosocial components) targeting older adults with CNCP. This review adhered to the JBI methodology, a protocol was a priori registered as a preprint on the medRxiv platform, and the results were reported according to the PRISMA-ScR (Preferred Reporting Items for Systematic Reviews and Meta-Analyses extension for Scoping Reviews) guidelines. Four electronic databases (PubMed, Cochrane Central Register of Controlled Trials, Web of Science, and PsycINFO) were systematically searched for relevant articles. Studies were included if they reported on multimodal interventions (including both physical and psychosocial components) delivered through any eHealth modality to an older population with any type of CNCP. Two reviewers selected the studies: first by screening titles and abstracts and second by screening full-text articles. The quality of the included studies was evaluated using the Quality Assessment Tool for Studies with Diverse Designs. The results of the studies were summarized narratively. A total of 9 studies (n=6, 67% published between 2021 and 2023) with quality rated as medium to high were included, of which 7 (78%) were randomized controlled trials (n=5, 71% were pilot and feasibility studies). All the included studies evaluated self-management interventions, most of them (n=7, 78%) specifically designed for older adults. The participants were aged between 65 and 75 years on average (mean 68.5, SD 3.5 y) and had been diagnosed with different types of CNCP (eg, osteoarthritis and chronic low back pain). Most of the included studies (5/9, 56%) involved the use of multiple eHealth modalities, with a higher use of web-based programs and video consulting. Only 1 (11%) of the 9 studies involved a virtual reality-based intervention. The evaluated interventions showed signs of effectiveness in the targeted biopsychosocial outcomes, and the participants' engagement and ratings of satisfaction were generally positive. However, several research gaps were identified and discussed. Overall, of late, there has been a growing interest in the potential that eHealth multimodal interventions offer in terms of improving pain, physical, and psychosocial outcomes in older adults with CNCP. However, existing literature on this topic still seems scarce and highly heterogeneous, with few proper randomized controlled trials, precluding robust conclusions. Several gaps emerged in terms of the older population considered and the lack of evaluation of comorbidities. RR2-10.1101/2023.07.27.23293235.

Prevalence of opioid misuse in patients with cancer: a systematic review and meta-analysis

Background/ObjectivesLong-term consequences of opioid consumption, such as misuse, have been a major concern in patients with chronic non-cancer pain. Potentially opioid misuse may also be a consequence in patients with cancer in opioid treatment which encouraged us to undertake this systematic review assessing the frequency of opioid misuse in this population.Materials/MethodsThe search strategy comprised words related to cancer, opioid misuse, and frequency. PubMed, Embase, PsycInfo, and Cinahl were searched from inception to July 2023. Prospective studies were selected and analysed regarding frequency, study characteristics, and quality. A meta-analysis was possible to carry out for a sub-group (opioid misuse risk).ResultsFrom 585 abstracts screened, six articles were included. Only prevalence data were found. The prevalence of opioid misuse ranged from 5.7% to 84%, while the prevalence of opioid misuse risk varied from 2.4% to 35.4%. The pooled prevalence of opioid misuse risk was 12.3% (95% CI: 0.8–36.3; I2 = 98.4%, 95% CI: 97.2–99.1). The studies differed regarding, e.g., methods, misuse definitions, and assessment instruments.ConclusionsFew studies were identified and large differences in prevalence for opioid misuse and opioid misuse risk were observed. Methodological disparities and the studies quality underscore the importance of improved studies in the future.

Opioid analgesic dose and route conversion ratio studies: a scoping review to inform an eDelphi guideline.

Clinicians regularly prescribe opioids to manage acute and chronic cancer pain, frequently to address acute postoperative pain, and occasionally to manage chronic non-cancer pain. Clinical efficacy may be suboptimal in some patients due to side effects and/or poor response, and opioid rotation/switching (conversions) is frequently necessary. Despite the widespread practice, opioid conversion ratios are inconsistent between clinicians, practices, and countries. Therefore, we performed a scoping systematic review of opioid conversion studies to inform an international eDelphi guideline. To ensure a comprehensive review, we conducted a systematic search across multiple databases (OVID Medline, PsycINFO, Embase, EBM-Cochrane Database of Systematic Reviews and Registered Trials, LILACS, IMEMR, AIM, WPRIM) using studies published up to June 2022. Additionally, we performed hand and Google Scholar searches to verify the completeness of our findings. Our inclusion criteria encompassed randomized and non-randomized studies with no age limit, with only a few pediatric studies identified. We included studies on cancer, non-cancer, acute, and chronic pain. The level and grade of evidence were determined based on the Multinational Supportive Care in Cancer (MASCC) criteria. Our search yielded 21,118 abstracts, including 140 randomized (RCT) and 68 non-randomized (NRCT) clinical trials. We compared these results with recently published conversion ratios. Modest correlations were noted between published reviews and the present scoping systematic review. The present scoping systematic review found low-quality evidence to support an opioid conversion guideline. We will use these data, including conversion ratios and type and route of administration, to inform an eDelphi guideline.

Experiences and perceptions of participating in a peer-support intervention for adults with chronic non-cancer pain.

Experiences and perceptions of participating in a peer-support intervention for adults with chronic non-cancer pain.

Attentional Bias for Opioids in Taiwanese Heavy Smokers with Chronic Noncancer Pain.

Background and Objectives: Attentional bias (AB) for addictive substances is a feature of attention found in individuals with substance misuse or diagnosed with substance use disorders. When AB exists, the attention of the addicted individual may be quickly oriented to cues related to the addictive substance or be maintained on these cues for a longer time. AB toward opioids was found in Western samples of smokers with chronic noncancer pain. The level of AB was dose-responsive. However, similar studies in the Taiwanese population are lacking. This study compared the patterns of AB for opioid analgesics in Taiwanese participants with chronic noncancer pain to that of individuals without pain. This study aimed to investigate if AB toward opioids is presented in Taiwanese heavy smokers who are on long-term opioid therapy for pain control. Materials and Methods: Participants were grouped into chronic noncancer pain smokers, chronic pain nonsmokers, and smokers without pain, according to smoking habits and whether or not on long-term opioid therapy for pain control. Each participant completed demographic questionnaires, mood scales, and the opioid-related visual probe task. Differences in AB among the groups were compared using a three-way analysis of covariance controlling for daily cigarette consumption. Results: Chronic noncancer pain smokers (n = 17) and chronic pain nonsmokers (n = 16) displayed more severe levels of depression, anxiety, and pain, compared to smokers without pain (n = 28). Only did chronic pain nonsmokers show significant AB for opioid cues that were displayed for a short time. Analysis on reaction time found that smokers without pain consistently responded faster to the tasks. No difference in reaction time was found between the pain groups. Conclusions: The current study did not fully replicate findings from studies that were based in Western countries. Formulary availability and regulatory limitations might have affected patient's perception of prescription opioids in Taiwan. However, chronic pain nonsmokers exhibited initial orientation toward opioid-related cues when daily cigarette consumption was accounted for. According to previous research, this AB for shortly displayed opioid cues can be associated with the expectation of pain relief. The current finding also indicated general psychomotor retardation in individuals who were on long-term use of opioids.