Scandinavian Journal of Pain最新文献

Background: The transient receptor potential cation channel subfamily V1 (TRPV1) receptor is an important factor in pain transmission. The present Phase 2a study investigated the effect on evoked pain and safety of a topically administered TRPV1-antagonist (ACD440 Gel) in patients with chronic peripheral neuropathic pain (PNP).

Methods: This was an exploratory, randomized, placebo-controlled double-blind crossover study in patients with probable or definite PNP demonstrating sensory hypersensitivity, assessed as evoked pain on suprathreshold sensory stimulation, i.e. hyperalgesia. The aetiologies included a mix of postherpetic neuralgia, postoperative neuropathic pains, and chemotherapy-induced pain. Patients administered ACD440 Gel twice daily onto the painful area(s) for 7 days. Primary endpoint was hyperalgesia to brush, cold, heat, and pinprick. Secondary endpoints included spontaneous pain and Neuropathic Pain Symptom Inventory Questionnaire (NPSI). Due to a significant period effect, a post hoc analysis was conducted, including only period 1 data, i.e. a parallel group comparison.

Results: Fourteen patients were enrolled and completed the study. ACD440 Gel reduced pain intensity evoked by a 40°C thermoroller stimulus in heat hyperalgesic patients, by ACD440 from median 6 (IQR 4.75, 7.75) to 1.5 (IQR 0.75, 2.25), i.e. by -5.0 (95%CI -11.2, 1.2) vs placebo from median 4 (IQR 3.5, 5.0) to median 5.0 (IQR 4.5, 6.5), i.e. by 1.3 (95%CI -1.5, 4.2), p = 0.029. There were no adverse events induced by study treatment. Evoked mechanical hyperalgesia and brush allodynia were not significantly affected, p = 0.07.

Conclusion: ACD440 Gel demonstrated a significant analgesic effect on thermally evoked pain, especially in suprathreshold heat pain. This is congruent with an attenuation of thermal hyperalgesia in chronic neuropathic pain patients with C-fibre mediated pain, while there was no effect on evoked pain related to Aβ and Aδ stimuli. The results support further clinical development in patients with thermally induced C-fibre mediated pain.

Objective: The aim of this study is to assess the clinical impression of health professionals at the Pain and Rehabilitation Centre, Linköping University Hospital, Sweden, according to whom patients have gradually become more complex and "difficult" over time.

Methods: This is a repeated cross-sectional study. Over 8,000 patients assessed between 2009 and 2022 answered questionnaires from the Swedish quality registry for pain rehabilitation. Patient-reported outcome measures were analysed with multivariate data analysis such as principal component analysis.

Results: During 2009-2022, the first principal component did not change statistically over time (p = 0.177), and it did not correlate to the year (rho = -0.014; p = 0.21). Patients were divided into three groups (2009-2012, 2013-2016, and 2017-2022), and a partial least squares-discriminant analysis model with group belonging as the Y-variable did not reveal any relevant differences (R ² = 0.048; Q ² = 0.045). For the period 2016-2022, additional data were available, enabling the comparison of pre- vs post-pandemic data by discriminant analysis. No clinically relevant difference was found.

Conclusions: It was not possible to confirm the clinical impression of health care personnel. While it is important to listen to "clinical hunches" emitted by experienced clinicians, it is also essential not to be too quick to equate such impressions with a true state of affairs.

Objectives: Acute Pain Services (APS) have significantly evolved since their establishment in the 1990s, emphasizing multimodal analgesia, which is a pivotal component of enhanced recovery after surgery, to enhance postoperative recovery. Despite improvements, variability in pain trajectories among patients necessitated the development of transitional pain units to address individual needs and ensure safe opioid tapering. The Norwegian National Registry for Advanced Acute Pain Services (AAPS), known as SmerteReg, was established to further enhance understanding of pain treatment in these patients. In this study, we aimed to analyze opioid use patterns and characteristics of opioid users referred to AAPS compared to non-opioid users.

Methods: Data from SmerteReg (2016-2020) were analyzed, including patient demographics, diagnoses, pain treatment, and patient-reported outcome measures. Patient characteristics at admittance were compared between opioid users and non-opioid users. Multivariate logistic regression was used to explore factors associated with opioid use.

Results: Of 1,068 patient tracks, 64% were opioid users at admittance. Opioid users were older and more frequently female, reporting higher levels of anxiety, depression, catastrophizing, and sleep problems before admission. Sleep problems before admittance was reported three times more frequent by patients using opioids compared to patients not using an opioid at admittance.

Conclusion: Pre-admittance opioid use was prevalent among patients referred to AAPS, emphasizing the need for tailored pain management strategies. Women, older patients, and those reporting sleep problems before admittance were more likely to use opioids. The finding that sleep problems before admittance were strongly associated with opioid use, suggests the importance of addressing sleep disturbances in pain management protocols. This study contributes to understanding opioid use patterns and factors influencing pain management in hospitalized patients.

Objectives: The STarT Back screening Tool (SBT) captures patients with low back pain (LBP) at risk of worse prognosis. However, the SBT does not include assessment of multisite and chronic widespread pain (MS-CWP). The aim was to study the differences in prognostic factors in patients with LBP classified according to SBT or SBT in combination with MS-CWP, and the 1-year outcome regarding visits to physiotherapist and sickness absence, in relation to risk scorings.

Methods: In this 1-year prospective study, adults (18-67 years) seeking care for LBP in primary care were classified into three prognostic risk groups (low, medium, high), using SBT only and using a combined screening tool (SBT and MS-CWP). Differences in prognostic factors at baseline, and outcome in terms of number of physiotherapist visits and sickness absence the year after inclusion were compared for risk groups derived by the two methods.

Results: Eighty-four patients (61% women) were included in the study. According to SBT alone, 19 were classified as low risk, 48 as medium risk, and 17 as high risk. When using the combined screening tool, additionally seven patients from the medium risk group were classified as high risk. Patients classified as high risk by SBT only or by the combined screening tool showed similar statistically significant worse mental health, health status, kinesiophobia, physical function, and sleep, as compared to the low-risk group. There were no differences in visits to physiotherapist and sickness absence between the risk groups for neither of the tools.

Conclusion: The combined screening tool resulted in more patients being classified as high risk than with SBT alone. The three risk groups identified either by SBT alone or by the combined screening tool differed significantly on all investigated prognostic factors, suggesting that including MS-CWP to the SBT captures more patients at risk.

Objectives: Phantom limb pain (PLP) is common after limb amputation and can lead to chronic pain and psychosocial risks, potentially leading to suicide or euthanasia. This study aimed to explore the consequences of intractable PLP on a person's life before, during, and after receiving phantom motor imagery (PMI) treatment, focusing on the person's experiences with PMI and how it influenced his life and decision regarding euthanasia.

Methods: This case study focused on a single participant from the PMI treatment group of a PLP randomized clinical trial (RCT). The participant, who joined the RCT as a last resort before euthanasia, experienced decreased PLP during the trial, but the pain returned 1 month post-treatment. Subsequently, the participant initiated self-administered PMI training at home. A mixed quantitative-qualitative method approach was used to analyze this case study.

Results: Understanding and living with PLP was challenging for the participant, making him lose interest in life. Despite starting with low expectations, the participant enjoyed PMI, particularly home training. PLP disappeared during the RCT, returned after therapy cessation, and vanished again during PMI home training. PMI returned his motivation to live, leading him to discontinue his plans for euthanasia.

Conclusions: This case illustrates the severity of chronic PLP, highlighting also the complex interaction of biopsychosocial factors in pain, which can lead a person to consider euthanasia. Representing the first use of PMI in a home setting, this study, along with previous studies in clinical setting, indicates PMI to be a promising and feasible innovative intervention for decreasing PLP, encouraging further research. This study also emphasizes the need to enhance PLP education among clinicians and people with amputations.

Objectives: Hypermobile Ehlers-Danlos syndrome (hEDS) is a multisystemic disorder in which pain and psychological symptoms appear to be highly interrelated. We investigate the relationships between pain intensity, pain location, and psychological distress in patients with hEDS.

Methods: The study sample in this cross-sectional study comprised patients with diagnosed hEDS (n = 81) aged 18-67 years, with a mean age of 39.5. Sociodemographic information was collected using a questionnaire. Pain intensity was measured using the numeric rating scale, depressive symptoms with the Beck Depression Inventory, and pain-related anxiety with the Pain Anxiety Symptoms Scale. The interrelations between pain intensity and psychological factors were analysed for each of the following anatomical regions: head, neck, upper extremities, chest, back, abdomen, and lower extremities.

Results: The results show that pain was intense and occurring in multiple anatomical regions. Pain intensity was related to depressive symptoms and pain anxiety, with the strength of the relationship varying across different anatomical regions. Specific findings were that strongest associations of depressive symptoms and pain intensity were in the abdomen and lower extremities. In contrast, pain in the upper extremities did not relate to depressive symptoms or pain anxiety.

Conclusion: This is the first study on patients with hEDS that elucidates the multisite pain symptoms and their interrelation to psychological symptoms. The total burden of pain can be considered a strong contributing element to the results found in our study. These factors should be considered when treating patients with hEDS.

The term "neuroinflammation" (NI) is currently popular, and the meaning is a long way from the original description restricted to findings after stroke, central nervous system (CNS) trauma, or CNS infection. NI has been implied in association with diseases of the CNS, such as Alzheimer's, Parkinson's, and Multiple Sclerosis. In addition, it has also been associated with psychiatric/psychological diagnoses, chronic pain diagnoses, stress, many functional disorders, and "central sensitization." Findings proposed to be evidence for NI have been found not only in the brain but also in the spinal cord, dorsal root ganglia, and peripheral nerves. Worrisome is the mistaken confusion that leads "association" to be "proof of cause," where there is much dispute over whether findings are really evidence for inflammation. This article is a short review of the literature and a critique of the concept of NI.

Objectives: To compare pain trajectories and acute exercise-induced pain over a 16-week period in patients with hypermobility spectrum disorder (HSD) undergoing high-load (HEAVY) or low-load (LIGHT) shoulder exercise.

Methods: In this secondary analysis using data from a randomized controlled trial, we included men and women aged 18-65 with HSD and shoulder complaints >3 months. Participants were randomly allocated (1:1 ratio) to 16 weeks of HEAVY or LIGHT shoulder exercise program, performed three times weekly. The HEAVY program consisted of progressive strengthening and full range of motion exercises, while the LIGHT program included low-load exercises performed in neutral to mid-range. Pain was assessed using the numeric rating scale (NRS) before and after each exercise session. Pain trajectories were assessed using pre-exercise pain scores at the final session each week. Exercise-induced pain was evaluated as the change in pain before and after exercise, using the mean of the three sessions each week. Both outcomes were analyzed using linear mixed models.

Results: Data from 64 out of 100 patients (HEAVY 34, LIGHT 30) were analyzed (80% women, mean age 39.6, mean Beighton score of 5.8). Shoulder pain was reduced by 0.89 NRS in HEAVY (95% CI 0.4 to 1.4) and 0.33 NRS (95% CI -0.25 to 0.91) in LIGHT. The between-group difference in change in pain from baseline to week 16 was 0.56 (95% CI -0.20 to 1.33, p = 0.149). There was no between-group difference in pain trajectories (group × time interaction, p = 0.321). The mean exercise-induced pain over time was similar in both groups (group × time interaction, p = 0.614), with pain below 0.5 NRS throughout the 16 weeks.

Conclusions: Pain trajectories over 16 weeks were similar in patients with HSD and persistent shoulder complaints performing high-load or low-load shoulder exercises. There was minor to no exercise-induced pain during high-load strengthening exercise, challenging previous beliefs.

Objectives: Chronic pain is a major global public-health issue. In Sweden, 20% adults report moderate to severe chronic pain, with 7% continuously seeking healthcare. Shortcomings in treatment, accessibility, and knowledge in healthcare for chronic pain have previously been reported. A generic treatment structure from primary to specialized care and rehabilitation was missing. This study aims to describe the development process for the creation of a person-centered and coherent care (P3C) pathway for adults with chronic pain in Sweden.

Methods: A National Action Group with expertise in pain medicine, rehabilitation medicine, psychiatry, anesthesiology, neurosurgery, general medicine, nursing, psychology, physiotherapy, occupational therapy, and patient representation was commissioned to develop the pathway following a stepwise co-designed approach, which included mapping current situation, goals, measures and indicators of the pathway, assessment of consequences and anchoring the process.

Results: Goals were based on challenges identified in the mapping, including improvements in patient's well-being, continuity during and between care contacts, timely self-management, communication between levels of care, and knowledge about pain. Points of pathway entrance and exit were described. Measures focused on areas such as early pain analysis, biopsychosocial approach to assessment and treatment, early rehabilitation plan, teamwork, dialogue and joint plans between levels of care, patient participation, and education on pain and its consequences. Process and outcome indicators, and a report on benefits and risks for patients, ethical aspects, costs, and impacts of the pathway on other areas of healthcare were included.

Conclusions: The P3C pathway addressed the challenges described by patients and practitioners. By being person-centered and coherent, it can promote patient empowerment and equality in care, with emphasis on early and timely interventions, dialogue between patients and practitioners and between levels of care, self-management of pain instead of prolonged medical intervention, value-driven and coordinated care contacts, and increased knowledge about chronic pain, based on existing evidence and experience.