Spinal Cord Stimulator Implantation for Complex Regional Pain Syndrome in Patient With Extensive Vertebral Surgical History: A Case Report.

Spinal cord stimulation (SCS) has emerged as a novel therapeutic option for refractory complex regional pain syndrome (CRPS). However, SCS placement is often complicated by a prior history of surgical manipulation and hardware implantation along the spinal column. Through this case exploration, we aim to expand the technical approach to SCS implantation in CRPS and encourage further research into innovative approaches for this treatment modality. Our patient is a 61-year-old female with a past medical history of bilateral C7 cervical pedicle fracture status and extensive surgical manipulation, including cervical laminectomy and hardware placement along the cervical spine. The development of CRPS refractory to conventional therapies complicated her course. We obtained non-contrast computed tomography (CT) to confirm intact lamina in vertebral levels below C3 and proceeded with the SCS trial with successful lead placement up to C5. Despite prior surgical manipulation of the vertebral spine hindering our ability to access the ideal C2 level, we were able to achieve significant coverage up to the C5 level. Obtaining non-contrast CT preoperatively and carefully assessing the epidural space patency were integral to our ability to assess the feasibility of lead placement in a patient with extensive hardware. Through this approach, we are able to offer SCS to patients who would otherwise be precluded from this modality.

Perceived Pain in People Living with Amyotrophic Lateral Sclerosis-A Scoping Review.

(1) Background: Pain is a common symptom in patients with Amyotrophic Lateral Sclerosis (ALS). There are no evidence-based pharmacological treatments for pain in ALS; recommendations are based on guidelines for chronic non-oncological pain and clinical experience. The aim is to map the literature on how people with ALS experience pain, and how this affects their daily activities and social relationships. (2) Methods: This scoping review included studies concerning patients with spinal/bulbar ALS aged ≥ 18 years who experience pain, focusing on perception, characteristics, treatment, and impact on quality of life. Temporal and linguistic criteria were applied when searching the MEDLINE, CINAHL, and SCOPUS databases. (3) Results: The management of pain in these patients is complex and involves the use of anti-inflammatory drugs, analgesics, and opioids. Pain is associated with other conditions such as depression and anxiety, which contribute to a deterioration in the quality of life. Moreover, pain may also negatively influence patient compliance with prescribed treatment regimens and the quality of care they perceive themselves to be receiving. (4) Conclusions: It is of the most importance to identify effective ways to assess and treat this issue, with health care professionals taking an active role in this process.

Chronic Pain in Spanish Physiotherapy Practice: Treatment Challenges and Opportunities in Diverse Healthcare Settings-A Qualitative Study.

Background/Objectives: Physiotherapists face significant challenges in managing chronic pain; a complex condition best addressed through a biopsychosocial (BPS) approach. Although substantial evidence exists globally, research specific to Spain remains limited. This study explores the experiences and challenges Spanish physiotherapists encounter in integrating BPS elements across public and private healthcare settings. Methods: Semi-structured interviews with 12 experienced physiotherapists were conducted, using a qualitative approach with purposive sampling and reflexive thematic analysis. The analysis, grounded in a constructivist/interpretivist framework, allowed themes to emerge naturally from the data, supported by relevant quotes. Results: Three primary themes were identified: (1) challenges in implementing the BPS approach, including patient resistance and limited training; (2) facilitators for adopting the BPS model, such as multidisciplinary support and positive patient outcomes; and (3) emotional and psychological aspects of the physiotherapists. The findings highlight the complexities of chronic pain management in physiotherapy, emphasizing the need for enhanced psychological training, integrated multidisciplinary care, early diagnosis, and effective family involvement. These insights are critical for improving both patient care and physiotherapist well-being. Conclusions: This study provides valuable guidance for future strategies, focusing on educational enhancements, multidisciplinary collaboration, healthcare policy reform, and emotional support for physiotherapists within the Spanish healthcare context.

An in-Depth Exploration of Consumer and Consumer Representative Views on Chronic Pain Management in Australia: A Key Informant Interview Study.

Chronic pain affects millions of Australians. Despite guidelines recommending non-pharmacological approaches as the first line treatment, opioid medications remain among the most common treatments. This study interviewed consumers and consumer representatives (i.e., representatives of peak pain advocacy organizations in Australia) to gain first-hand perspectives on chronic pain treatment in Australia. Individual semi-structured Key Informant Interviews (KIIs) with three consumers and three representatives were undertaken. Interviews were transcribed, and thematic analysis applied. Results showed that consumers and consumer representatives identified critical treatment access barriers. Another shared theme related to overarching principles of care, with sub-themes pertaining to the need for an interdisciplinary approach and pain education. A further shared theme focused on typical medical interventions, with one shared subtheme regarding the benefits and drawbacks of pain medications. Both groups highlighted the importance of a biopsychosocial approach with consideration of mental health, particularly related to perceived stigma and comorbidities. These findings highlight that chronic pain remains both undertreated and inadequately treated in Australia. There is a critical need to use novel approaches to overcome access barriers and stigma, and to advance precision medicine to match patients to the treatment most likely to be of benefit as early as possible in their journey.

Efficacy of Radio Electric Asymmetric Conveyer (REAC) Biomodulation Treatments in Managing Chronic Pain, Edema, and Metabolic Syndrome: A Case Report.

This case report presents a 67-year-old male with a history of metabolic syndrome, uncontrolled diabetes mellitus, hypertension, and prostate cancer, who underwent radio electric asymmetric conveyer (REAC) biomodulation treatments, specifically anti-cellulite treatment (ACT), circulatory optimization (CO), and metabolic optimization (MO). The patient initially presented with severe pain and edema in the left lower limb, requiring morphine. Over three months, he received a combination of ACT, CO, and MO protocols. Remarkable improvements were observed in pain intensity, edema reduction, balance, and overall quality of life, with a reduced reliance on morphine. This report highlights the potential of REAC biomodulation therapies in managing complex conditions associated with metabolic syndrome.

Startle sign events induced by mechanical manipulation during surgery for neuroma localization: a retrospective cohort study.

BACKGROUND: Chronic pain from peripheral neuromas is difficult to manage and often requires surgical excision, though intraoperative identification of neuromas can be challenging due to anatomical ambiguity. Mechanical manipulation of the neuroma during surgery can elicit a characteristic "startle sign", which can help guide surgical management. However, it is unknown how anesthetic management affects detection of the startle sign. METHODS: We performed a retrospective cohort study of 73 neuroma excision surgeries performed recently at Massachusetts General Hospital. Physiological changes in the anesthetic record were analyzed to identify associations with a startle sign event. Anesthesia type and doses of pharmacological agents were analyzed between startle sign and no-startle sign groups. RESULTS: Of the 64 neuroma resection surgeries included, 13 had a startle sign. Combined intravenous and inhalation anesthesia (CIVIA) was more frequently used in the startle sign group vs. no-startle sign group (54% vs. 8%), while regional blockade with monitored anesthetic care was not associated with the startle sign group (12% vs. 0%), p = 0.001 for anesthesia type. Other factors, such as neuromuscular blocking agents, ketamine infusion, remifentanil infusion, and intravenous morphine equivalents showed no differences between groups. CONCLUSIONS: Here, we identified hypothesis-generating descriptive differences in anesthetic management associated with the detection of the neuroma startle sign during neuroma excision surgery, suggesting ways to deliver anesthesia facilitating detection of this phenomenon. Prospective trials are needed to further validate the hypotheses generated.

Diagnostic Pain: A Case of Pudendal Neuralgia.

Pudendal neuralgia remains a challenging diagnosis given the absence of sensitive biomarkers or imaging findings. The following case describes a patient with rectal pain complicated by prolonged hospitalization who was eventually diagnosed with pudendal neuralgia per the Nantes criteria. It furthermore underscores several confounders that prevented timely diagnosis, including misattribution of her symptoms to prior resolved conditions, anchoring bias in the absence of confirmatory evidence, and misattribution of her pain to opiate-induced allodynia. It also draws attention to the toll exacted by delays in diagnosis, including patient discomfort, deconditioning, exposure to high-dose opioids, susceptibility to potential nosocomial infections, strain on patient-provider relationships, and the need for post-discharge inpatient rehabilitation, in addition to significant financial costs.

Interventional Strategies for Alleviating Severe Abdominal Pain in Chronic Pancreatitis and Abdominal Cancer: A Case Report on the Use of Splanchnic Nerve Radiofrequency Ablation and Erector Spinae Plane Block.

A cancer diagnosis marks the beginning of a difficult path filled with a profound battle against the excruciating pain associated with the illness. Cancer-related pain, which is complex and emotionally distressing, presents unique challenges in terms of treatment. Abdominal cancers and metastases frequently result in severe and unmanageable pain that does not respond well to traditional medications. In such situations, interventions like neurolysis and radiofrequency ablation of the splanchnic nerves and celiac plexus have emerged as effective strategies, providing enhanced pain relief and reducing the need for narcotic painkillers. In this case report, we describe a case of a 38-year-old man with a longstanding history of chronic pancreatitis with a polypoid growth close to the ampulla in the duodenal bulb. The patient was given pain medications to alleviate the pain, but the severe stomach pain, vomiting, and fever persisted. Imaging tests supported the diagnosis and showed chronic pancreatitis, a continuing inflammatory process, and a periampullary adenocarcinoma. The patient had significant pain while being positioned prone for the diagnostic block, hence an erector spinae plane block was done before the radiofrequency ablation. The patient received radiofrequency ablation at the T11 and T12 levels after receiving a diagnostic splanchnic nerve block, significantly reducing pain. The effectiveness of these interventional procedures in enhancing the patient's quality of life and decreasing their dependence on narcotic drugs was highlighted by follow-up visits at two, four, and six months that revealed little to no discomfort. This instance emphasizes the importance of considering neurolysis and radiofrequency ablation as essential alternatives for treating severe abdominal pain brought on by chronic pancreatitis and abdominal cancer.

The Intra-Articular Combination of Fentanyl, Dexamethasone, Clonidine, Ropivacaine, and Dextrose to Treat Pain Due to Knee Osteoarthritis: A Case Report.

We report a case involving the pain management of a patient with knee osteoarthritis (KOA), where conventional treatment failed to provide pain relief. Instead, a multimodal approach including an intra-articular (IA) injection of a combination of various agents was applied successfully. The pharmacological treatment resulted in minimal improvement. After experiencing failure with IA hyaluronic acid and platelet-rich plasma injections, an IA combination of fentanyl 50 mcg, dexamethasone 8 mg, clonidine 150 mcg, ropivacaine 7.5% 5 ml, dextrose 30% 5 ml, and normal saline 5 ml was applied. The treatment led to a two-year pain relief. The multimodal approach seems to offer satisfactory and encouraging results as the improvement in the quality of life led to favorable physical and psychological outcomes in the patient.

Efficacy of botulinum toxin injection using the right-sided unilateral retrocrural approach for celiac plexus in a cancer survivor with persistent abdominal pain: a case report.

Cancer survivors often face persistent abdominal pain, necessitating optimal pain management. While celiac plexus block (CPB) and botulinum toxin (BT) injection are viable options, traditional methods may encounter challenges due to patient-specific concerns and anatomical complexities. Here, the case of a cancer survivor in his 70 s experiencing recurrent abdominal pain, who declined conventional percutaneous CPB approaches due to anxiety related to aortic puncture, is presented. Following a pancreaticoduodenectomy, the patient developed chronic abdominal pain attributed to adhesions leading to small bowel obstruction. Concurrently, there was notable psychological distress, including anxiety, depression, and heightened concerns regarding tumor recurrence. Considering the patient's specific concerns, a right-sided unilateral retrocrural single-needle technique was proposed, aimed at alleviating pain, while avoiding conventional CPB approaches. Initial right-sided retrocrural CPB offered short-term relief, prompting a subsequent BT injection using the same approach. Following BT injection, the patient reported significant and sustained pain reduction (from 8 to 1 on an 11-point numerical rating scale) at both 12 and 20 weeks post-procedure. Right-sided retrocrural BT injection offers an alternative approach, addressing patient concerns and demonstrating prolonged pain relief. This may benefit cancer survivors with upper abdominal pain, emphasizing the importance of personalized and innovative pain management strategies.

Lumbar Sympathetic Block Leading to Increased Arterial Diameter and Blood Flow: A Mechanism of Therapeutic Benefit.

Lumbar sympathetic blocks (LSBs) have long been used for the treatment of chronic lower extremity pain and for conditions such as complex regional pain syndrome (CRPS). With a better understanding of the autonomic nervous system and its function, these blocks have grown in their utility. Through this growth, however, our understanding of sympathetic-mediated pain is still vaguely understood. Here, we present a case of a patient who underwent a point-of-care ultrasound (POCUS) before and after an LSB, and we were able to show significant dilation of the posterior tibial artery (PTA) following the block. We propose that this arterial dilation plays a mechanistic role in providing pain relief to patients who undergo LSB. This increased blood flow can not only enhance healing properties to surrounding tissues but also allow for nitric oxide to play potential regulatory roles in pain pathways. Here, we also review potential mechanisms of the amelioration of sympathetic-mediated pain as well as the potential utilization of LSBs and neuromodulation in treating visceral pathologies through a better understanding of visceral somatic relationships.

Health Resource Utilization and Cost Impact of Integrative Medicine Services for Newly Diagnosed Chronic Pain Patients.

Background: Integrative medicine (IM) is the healing-oriented practice of medicine that emphasizes the relationship between practitioner and patient. It considers the whole person, their environment, lifestyle, and social and cultural factors. It is evidence based and makes use of all appropriate therapies, conventional and complimentary. Objective: To evaluate the impact of IM services on health outcomes and care costs of chronic pain management patients compared with standard care. Methods: This article uses University of New Mexico hospital billing data from 10/2016 to 09/2019 to identify patients with nervous system or musculoskeletal pain. A total of 1,304 patients were matched using propensity scores into IM services (treatment: 652) and standard care (control: 652) cohorts for difference-in-differences analysis. The patients were matched based on age, sex, race, zip code, insurance type, ICD-10s, prescriptions, health care events, and medical claim costs. Results: Patients who used IM services had better health outcomes and lower costs at 3-month, 6-month, and 12-month follow-up. At the 12-month follow-up, the IM group showed a 19% decrease in utilization of inpatient care, a 37% decrease in Emergency Department utilization, and an 11.3% reduction in claim costs compared with the control group. Conclusion: Patients who utilize IM services as part of chronic pain management have overall lower health care costs and better health outcomes. Unfortunately, in the health system studied, less than 3% of patients utilize these services. Promotion of and education about IM services should be aimed at both patients and their providers.

Poland Syndrome and Multimorbidity in a 79-Year-Old Male.

This case study highlights a 79-year-old man with chronic low back pain attributed to severe lumbar scoliosis. Physical examination revealed the unilateral absence of pectoral muscles and ipsilateral hand anomalies, indicative of Poland syndrome (PS). The patient also experienced depression due to chronic pain and PS-related anomalies. A multi-disciplinary approach proved effective in alleviating both pain and depression.

Continuing home opioid dose in chronic opioid users reduces total opioid use after ventral hernia repair.

INTRODUCTION: Managing acute postoperative pain in patients on chronic opioid therapy is challenging. There is little data regarding optimal perioperative chronic opioid management. We hypothesized that continuing the home dose of opioid while inpatient following ventral hernia repair (VHR) would reduce total opioid consumption postoperatively. METHODS: Chronic opioid users were ordered their home opioid scheduled and our standard multimodal analgesia regimen. At time of discharge, we reviewed inpatient opioid use and prescribed opioids based on morphine milligram equivalent (MME) consumed per our established protocol. RESULTS: VHR was performed in 658 patients with 117 utilizing chronic opioid medications from June 2017 through March 2022; 43 patients were managed on protocol and 74 were not. Inpatient daily MME consumption was similar between groups (34 vs 36 MME; p â€‹= â€‹0.285). Patients treated according to protocol received significantly lower MME prescriptions at discharge (80 vs 225 MME; p â€‹< â€‹0.001) with similar refills (21.4 vs 25.4 â€‹%; p â€‹= â€‹0.820). CONCLUSION: Continuing home opioids for chronic opioid users following VHR resulted in less opioid prescribing with no increase in refills.

A Novel Ultrasound-Guided Bilateral Vagal Nerve Hydrodissection With 5% Dextrose Without Local Anesthetic for Recalcitrant Chronic Multisite Pain and Autonomic Dysfunction.

Chronic pain is a complex condition that often poses diagnostic and management challenges due to its multifactorial etiology. This case report describes a 49-year-old pastor who presented with a three-year history of chronic pain affecting multiple sites, including the neck, bilateral shoulders, thoracic region, lower back, and bilateral knees. Additionally, he experienced shortness of breath on mild exertion, which adversely affected his ability to converse and speak publicly. The patient had a rapid resting heart rate of 100-120 beats per minute, occasional palpitations, and a 24-hour electrocardiogram that confirmed 15% premature ventricular complexes with bigeminy and trigeminy. He complained of limited appetite with early satiety, intermittent nausea, and regurgitation. Despite consultations with multiple specialists, no underlying causes were identified in the cardiac, respiratory, gastrointestinal, or psychological domains. Ultrasound-guided bilateral vagus nerve hydrodissection using 5% dextrose without local anesthetics was administered three times at monthly intervals, resulting in remarkable pain relief within three months and the effects persisted at the nine-month follow-up. Tachycardia was no longer perceived, resting heart rate slowed to 70-80 beats per minute, shortness of breath improved, and public speaking ability was restored. The patient's early satiety, nausea, and reflux complaints were resolved. This case report highlights the potential effectiveness of this novel intervention for chronic pain. Further research is warranted to validate these findings and explore the mechanism of action.

Economic burden and dosing trends of buprenorphine buccal film and transdermal patch in chronic low back pain.

Aim: Exploring prescribing trends and economic burden of chronic low back pain (cLBP) patients prescribed buprenorphine buccal film (Belbuca®) or transdermal patches. Methods: In the MarketScan® commercial insurance claims (employees and their spouses/dependents, 2018-2021), the first film or patch prescription date was an index event. The observation covered 6-month pre-index and 12-month post-index periods. Results: Patients were propensity-score matched (708 per cohort). Buprenorphine initiation had stable cost trends in buccal film and increasing trends in transdermal patch cohort. Between-cohort comparisons of healthcare expenditures, cost trends and resource utilization showed significant differences, mostly in favor of buccal film. Buccal film also had higher daily doses and wider dosing range. Conclusion: Buprenorphine film is more cost-effective cLBP treatment with more flexible dosing.

What is this article about? This retrospective study included patients with chronic low back pain (cLBP) and commercial insurance in the USA. Only patients treated with Belbuca®, a buprenorphine buccal film, or a buprenorphine transdermal patch were included. Patients were observed 6 months prior to and 12 months after the first buprenorphine prescription. Healthcare costs, cost trends, resource use and buprenorphine treatment characteristics were explored.What were the results? Patients with cLBP on buccal film had lower costs, stable cost trends and less healthcare resources used. Also, they had higher buprenorphine daily doses.What do the results mean? The results imply that buccal film is less costly for cLBP patients than patches. The buccal film had more flexible dosing with higher daily doses, which might be associated with better pain control.

The Application of Radiofrequency Ablation in Acute and Chronic Pain Management.

Radiofrequency ablation (RFA), also known as rhizotomy, is one of the frequently used modalities in interventional pain management. This nonsurgical procedure delivers radiofrequency waves to the targeted nerves to interrupt transmission of nociceptive signals from the peripheral tissues to the central nervous system, thereby reducing pain perception. Recent studies have demonstrated the efficacy of RFA treatment as an effective interventional pain management technique to treat a variety of acute and chronic pain conditions including facial pain, headaches, postmastectomy, musculoskeletal, and major joint pain (knee, hip, shoulder, sacroiliac), and cancer pain. As more certified registered nurse anesthetists are involved in pain management, it is important to be familiar with current nonsurgical pain interventions. This journal course describes the unique mechanism of action of radiofrequency for pain modulation and provides emerging evidence to support its applications in both acute and chronic pain management.

Buprenorphine Facilitates Rapid Weaning From Very-High-Dose Intrathecal Hydromorphone.

Pain management in patients on chronic opioid therapy is a common clinical challenge. The phenomena of opioid-induced hyperalgesia and tolerance are important contributors to that challenge. There are multiple strategies described to wean opioid doses and/or transition patients off opioids altogether. However, there is very little data to guide transitions off chronic intrathecal opioids. Here, we report on two patients with intractable post-laminectomy pain syndrome, resulting in severe functional limitation in the setting of opioid escalation culminating in the intrathecal delivery of hydromorphone to daily doses as high as 20 mg/day. We describe their rapid successful weaning off opioids using low-dose buprenorphine, which resulted in a dramatic improvement in pain and function.

Development and Validation of a Treatment Algorithm for Osteoarthritis Pain Management in Patients With End-Stage Kidney Disease Undergoing Hemodialysis.

Background: Although osteoarthritis is common in the hemodialysis population and leads to poor health outcomes, pain management is challenged by the absence of clinical guidance. A treatment algorithm was developed and validated to aid hemodialysis clinicians in managing osteoarthritis pain. Objective: The objective was to develop and validate a treatment algorithm for managing osteoarthritis pain in patients undergoing hemodialysis. Design: A validation study was conducted based on Lynn's method for content validation. Setting: To develop and validate a treatment algorithm, interviews were conducted virtually by the primary researcher with clinicians from various institutions across the Greater Toronto and Hamilton Area in Ontario. Patients: The treatment algorithm was developed and validated for the management of osteoarthritis pain in patients on hemodialysis. Patients were not involved in the development or validation of the tool. Measurements: The algorithm was measured for content and face validity. Content validity was measured by calculating the content validity index of each component (I-CVI) of the algorithm and the overall scale validity index (S-CVI). Face validity was assessed by calculating the percentage of positive responses to the face validity statements. Methods: A draft algorithm was developed based on literature searches and expert opinion and validated by interviewing nephrology and pain management clinicians. Through consecutive rounds of 1:1 interviews, content and face validity were assessed by asking participants to rate the relevance of each component of the algorithm and indicate their level of agreeability with a series of statements. Following each round, the I-CVI of the algorithm as well as the S-CVI was calculated and the percentage of positive responses to the statements was determined. The research team revised the algorithm in response to the findings. The final algorithm provides a stepwise approach to the non-pharmacologic and pharmacologic management of pain, including topical, oral, and opioid use. Results: A total of 18 clinicians from 7 institutions across the Greater Toronto and Hamilton Area were interviewed (10 pharmacists, 5 nurse practitioners, and 3 physicians). The average S-CVI of the algorithm across all 3 rounds was 0.93. At least 78% of participants provided positive responses to the face validity statements. Limitations: An algorithm was developed based on input from clinicians working in the province of Ontario, limiting the generalizability of the algorithm across provinces. In addition, the algorithm did not include the perspectives of primary care providers or patients/caregivers. Conclusions: An algorithm for the management of osteoarthritis pain in the hemodialysis population was developed and validated through expert review to standardize practices and encourage clinicians to use evidence-based treatments and address the psychosocial symptoms of pain. As the algorithm possesses a high degree of content and face validity, it may improve osteoarthritis pain management among patients undergoing hemodialysis. Future research will assess the implementation of the algorithm across hemodialysis settings.

Contexte: Bien que l'arthrose soit fréquente et qu'elle entraîne de mauvais résultats de santé chez les patients en hémodialyse, la gestion de la douleur liée à l'arthrose est limitée par l'absence de directives cliniques. Un algorithme de traitement a été développé et validé afin d'aider les cliniciens en hémodialyse à gérer la douleur liée à l'arthrose chez leurs patients. Objectifs: Développer et valider un algorithme de traitement pour la prise en charge de la douleur liée à l'arthrose chez les patients en hémodialyse. Conception: Étude de validation menée en utilisant la méthode de Lynn pour la validation du contenu. Cadre: Pour élaborer et valider l'algorithme, le chercheur principal a mené des entrevues en mode virtuel avec des cliniciens de divers établissements de Hamilton et de la région du Grand Toronto (Ontario). Sujets: L'algorithme de traitement a été développé et validé pour la prise en charge de la douleur liée à l'arthrose chez les patients en hémodialyse. Ces derniers n'ont pas participé au développement ou à la validation de l'outil. Mesures: La validité du contenu et la validité apparente de l'algorithme ont été évaluées. La validité du contenu a été mesurée en calculant l'indice de validité de chaque composante (I-CVI) de l'algorithme, ainsi que l'indice de validité à l'échelle globale (S-CVI). La validité apparente a été évaluée en calculant le pourcentage de réponses positives aux énoncés de validité apparente. Méthodologie: Une ébauche de l'algorithme a été développée à partir de recherches de littérature scientifique et d'avis d'experts, puis validée lors d'entretiens avec des cliniciens en néphrologie et en gestion de la douleur. Afin d'évaluer la validité du contenu et la validité apparente de l'algorithme, les cliniciens ont participé à des séries consécutives d'entretiens individuels où ils devaient évaluer la pertinence de chaque composante de l'algorithme et indiquer leur niveau d'accord avec une série d'énoncés. L'indice de validité du contenu de chaque composante (I-CVI) de l'algorithme, l'indice de validité de l'échelle globale (S-CVI) et le pourcentage de réponses positives aux énoncés ont été calculés après chaque tour. L'algorithme a ensuite été révisé par l'équipe de recherche en réponse aux résultats. L'algorithme final fournit une approche par étapes pour la gestion non pharmacologique et pharmacologique (traitement local, oral, opioïdes) de la douleur. Résultats: En tout, 18 cliniciens provenant de 7 établissements de Hamilton et de la région du Grand Toronto ont été interviewés (10 pharmaciens, 5 infirmières praticiennes et 3 médecins). L'indice S-CVI moyen de l'algorithme pour les trois séries d'entrevues était de 0,93. Au moins 78 % des participants ont fourni des réponses positives aux énoncés de validité apparente. Limites: L'algorithme a été élaboré à partir des données fournies par des cliniciens travaillant dans la province de l'Ontario, ce qui limite sa généralisabilité dans les autres provinces. Aussi, l'algorithme n'inclut pas le point de vue des prestataires de soins primaires ou des patients/soignants. Conclusion: Un algorithme de prise en charge de la douleur liée à l'arthrose chez les patients en hémodialyse a été développé et validé par des experts afin de normaliser les pratiques et d'encourager les cliniciens à utiliser des traitements fondés sur les preuves et à traiter les symptômes psychosociaux de la douleur. L'algorithme ayant montré un degré élevé de validité du contenu et de validité apparente, il a ainsi le potentiel d'améliorer la gestion de la douleur liée à l'arthrose chez les patients en hémodialyse. Les recherches à venir évalueront l'application de l'algorithme dans divers contextes d'hémodialyse.

Tiam1-mediated maladaptive plasticity underlying morphine tolerance and hyperalgesia.

Opioid pain medications, such as morphine, remain the mainstay for treating severe and chronic pain. Prolonged morphine use, however, triggers analgesic tolerance and hyperalgesia (OIH), which can last for a long period after morphine withdrawal. How morphine induces these detrimental side effects remains unclear. Here, we show that morphine tolerance and OIH are mediated by Tiam1-coordinated synaptic structural and functional plasticity in the spinal nociceptive network. Tiam1 is a Rac1 GTPase guanine nucleotide exchange factor that promotes excitatory synaptogenesis by modulating actin cytoskeletal dynamics. We found that prolonged morphine treatment activated Tiam1 in the spinal dorsal horn and Tiam1 ablation from spinal neurons eliminated morphine antinociceptive tolerance and OIH. At the same time, the pharmacological blockade of Tiam1-Rac1 signalling prevented the development and reserved the established tolerance and OIH. Prolonged morphine treatment increased dendritic spine density and synaptic NMDA receptor activity in spinal dorsal horn neurons, both of which required Tiam1. Furthermore, co-administration of the Tiam1 signalling inhibitor NSC23766 was sufficient to abrogate morphine tolerance in chronic pain management. These findings identify Tiam1-mediated maladaptive plasticity in the spinal nociceptive network as an underlying cause for the development and maintenance of morphine tolerance and OIH and provide a promising therapeutic target to reduce tolerance and prolong morphine use in chronic pain management.