Interventional Pain Management in Multidisciplinary Chronic Pain Clinics: A Prospective Multicenter Cohort Study with One-Year Follow-Up

Chronic Non-cancer Pain Management in a Tertiary Pain Clinic Network: a Retrospective Study

INTRODUCTION

Chronic pain is a distressing condition that should be treated in specialized pain clinics. Pain clinics offer a holistic, evidence-based approach, including pharmacological, complementary, and invasive treatments. This study aimed to provide preliminary information regarding chronic pain treatments and identify reasons for accessing an important hub-spoke pain clinic network.

METHODS

A retrospective multicenter cross-sectional study was carried out. A total of 1606 patients' records were included. Patients were selected from the 26 pain clinics of a single region in Italy. Univariate and multivariate logistic regression models were used.

RESULTS

Multivariate models showed that the use of opioids were considered effective for severe or moderate pain [odds ratio (OR) 0.41; 95% 0.33-0.51], while the use of invasive treatments (OR 2.45; 95% 1.95-3.06) and the use of complementary therapy (OR 1.87; 95% 1.38-2.51) were associated with severe or moderate pain. Overall, age, sex, nonsteroidal anti-inflammatory drugs (NSAID) use, a combination of NSAIDs, complementary therapies, and a combination of opioids and invasive treatments did not seem to be significantly associated with the nature of pain. Multivariate models confirmed that clinical parameters such as the nature of pain, multi-diagnosis, more than one site of pain, treatments, and general practitioner, but not the severity of pain and use of invasive treatments, had an impact on the choice of a pain clinic.

CONCLUSION

Opioids are useful in managing moderate or severe chronic pain. Multimodal approaches are used for the management of chronic pain. Moreover, it is not clear how patients are addressed to access different pain clinics (spoke versus hub) networks. More widespread adoption is needed for an interdisciplinary approach to managing chronic pain and adopting guideline recommendations, and rigorous research is required to provide more substantial evidence and support clinical practice.

Efficacy and safety of hyperbaric oxygen therapy for fibromyalgia: a systematic review and meta-analysis

OBJECTIVE

To investigate the efficacy and safety of hyperbaric oxygen therapy (HBOT) for fibromyalgia (FM).

DESIGN

A systematic review and meta-analysis.

DATA SOURCES

PubMed, EMBASE, Cochrane Library, Web of Science, VIP (China Science and Technology Journal Database), CNKI (China National Knowledge Infrastructure) and WanFang database were searched from from inception to 22 October 2022.

ELIGIBILITY CRITERIA

We included clinical trials (randomised controlled and non-randomised controlled trials) of HBOT for FM.

DATA EXTRACTION AND SYNTHESIS

Two researchers independently screened the literature, extracted data and evaluated the quality of the included studies, with disagreements resolved by a third researcher. The Cochrane Collaboration checklists and the Methodological Index for Non-randomised Studies were used to assess the risk of bias. Meta-analysis was performed by RevMan V.5.4.1 software. Random effect models were used for meta-analysis.

RESULTS

Nine studies were included in this review, with a total of 288 patients. For pain assessment, we combined the results of the Visual Analogue Scale and Widespread Pain Index. The results showed that HBOT could relieve the pain of FM patients compared with the control intervention (standardised mean difference=-1.56, 95% CI (-2.18 to -0.93), p<0.001, I 2=51%). Most included studies reported that HBOT ameliorated tender points, fatigue, multidimensional function, patient global and sleep disturbance in FM. Adverse events occurred in 44 of 185 patients (23.8%). Twelve patients (6.5%) withdrew because of adverse reactions. No serious adverse events or complications were observed.

CONCLUSIONS

HBOT might have a positive effect in improving pain, tender points, fatigue, multidimensional function, patient global and sleep disturbance in FM, with reversible side effects. Low pressure (less than 2.0 atmospheric absolute) may be beneficial to reduce adverse events in FM. Further studies should be carried out to evaluate the optimal protocol of HBOT in FM.

PROSPERO REGISTRATION NUMBER

CRD42021282920.

Effects of booster sessions on self-management interventions for chronic musculoskeletal pain: a systematic review and meta-analysis of randomised controlled trials

ABSTRACT

Our objective was to investigate the effectiveness of booster sessions after self-management interventions as a means of maintaining self-management behaviours in the treatment of chronic musculoskeletal pain. We searched MEDLINE, EMBASE, Science Citation Index, Cochrane Central Register of Controlled Trials, and PsychINFO. Two authors independently identified eligible trials and collected data. We calculated the odds ratio for the analyses of dichotomous data and standardised mean differences (SMDs) with 95% confidence interval (CI) for continuous variables. Our search identified 14 studies with a total of 1695 patients. All studies were at high risk of bias and provided very low quality evidence. For the primary outcomes, booster sessions had no evidence of an effect on improving patient-reported outcomes on physical function (SMD -0.13, 95% CI -0.32 to -0.06; P = 0.18), pain-related disability (SMD -0.16, 95% CI -0.36 to 0.03; P = 0.11), and pain self-efficacy (SMD 0.15, 95% CI -0.07 to 0.36; P = 0.18). For the secondary outcomes, booster sessions caused a significant reduction in patient-reported pain catastrophising (SMD -0.42, 95% CI -0.64 to -0.19; P = 0.0004) and no evidence of an effect on patient-reported pain intensity, depression, coping, or treatment adherence. There is currently little evidence that booster sessions are an effective way to prolong positive treatment effects or improve symptoms of long-term musculoskeletal conditions after self-management interventions. However, the studies were few with high heterogeneity, high risk of bias, and overall low quality of evidence. Our review argues against including booster sessions routinely to self-management interventions for the purpose of behaviour maintenance.

Anesthetic considerations in patients with implantable devices and chronic pain surgery

The use of advanced invasive techniques for the control of chronic pain in patients with multiple comorbidities is becoming increasingly common. Neuromodulation offers a new management alternative involving the infusion of one or more drugs into the epidural or intrathecal space through a fully implantable infusion pump. It also involves spinal stimulation, a minimally invasive technique in which electrodes are positioned in the epidural space and connected to a pulse generator that is implanted subcutaneously and generates pulses designed to suppress the noxious stimulus. This article will describe the anesthetic considerations in cases of implantable drug delivery systems, and spinal and peripheral nerve stimulation devices. Additionally, patients with electrical or drug neuromodulation devices may present to anesthetic practice for surgical indications unrelated to their chronic pain pathology. Hence the importance of being familiar with the basic components of these devices, how they work, what drugs they use and the potential associated complications in the perioperative context, in order to ensure proper management and patient safety.

Non-Adherence to Pharmacotherapy: A Prospective Multicentre Study About Its Incidence and Its Causes Perceived by Chronic Pain Patients

OBJECTIVE

Pharmacological interventions remain the cornerstone of chronic pain treatment; however, nearly 40% of the prescription medicines are not taken as prescribed. The present study aims at understanding and describing non-adherence from the perspective of chronic pain patients during a 1-year follow-up study.

METHODS

A cohort of 950 consecutive patients referred to a first consultation in Multidisciplinary Chronic Pain Clinics was followed with a standardized protocol for 1 year. This included assessment of pain characteristics; prescribed medication; therapeutic adherence; effectiveness of treatment, non-adherence and its perceived reasons; clinical outcomes and quality of life. We used a mixed methods approach, including qualitative and quantitative analyses.

RESULTS

Forty-nine percent of the 562 patients who responded to all assessments during follow-up were adherent after 1 year of chronic pain treatment. The core associations between each "non-adherence reason" and Anatomical Therapeutic Chemical Code (ATC) group were perceived side effects (p=0.019) and delayed start (p=0.022) for narcotic analgesics (opioids); perceived non-efficacy (p=0.017) and delayed start (p=0.004) for antiepileptics and anticonvulsants; perceived low necessity (p=0.041) and delayed start (p=0.036) for analgesics antipyretics; change in prescriptions because of a new clinical condition for antidepressants (p=0.024); high concerns (p=0.045) and change in prescriptions because of a new clinical condition (p<0.001) for non-steroidal anti-inflammatory drugs; delayed start (p=0.016) and financial constraints (p=0.018) for other medications.

DISCUSSION

This study emphasizes the patient's perspective regarding non-adherence to pharmacological treatment of chronic pain, providing valuable and novel information to be used in future interventions to help patients make an informed choice about their adherence behavior.

Hyperbaric oxygen and aerobic exercise in the long-term treatment of fibromyalgia: A narrative review

Chronic pain is one of the most common clinical presentations in the primary care settings. In the US, Fibromyalgia (FM) affects about 1-3% of adults and commonly occurs in adults between the ages of 40-50 years. FM causes widespread muscular pain and tenderness with hyperalgesia and allodynia and may be associated with other somatic complaints. Hyperbaric oxygen therapy (HBOT) has been utilized and has recently shown promising effects in the management of FM and other chronic pain disorders. In HBOT, the intermittent breathing of 100% oxygen in a pressurized chamber where the pressure is higher than 1 atmosphere absolute (ATA) has been utilized. HBOT exhibits a significant anti-inflammatory effect through reducing production of glial cells and inflammatory mediators which results in pain alleviation in different chronic pain conditions. HBOT can also influence neuroplasticity and affects the mitochondrial mechanisms resulting in functional brain changes. In addition to that, HBOT stimulates nitric oxide (NO) synthesis which helps in alleviating hyperalgesia and NO-dependent release of endogenous opioids which seemed to be the primary HBOT mechanism of antinociception. Moreover, aerobic exercise and meditative movement therapies (MMT) have gained attention for their role in pain alleviation through different anti-inflammatory and antioxidant mechanisms. In this review, we aim to elucidate the different mechanisms of HBOT and aerobic exercise in attenuating pain as adjuvant therapy in the multidisciplinary treatment strategy of chronic pain, and more particularly fibromyalgia.

Interventional Pain Management in Multidisciplinary Chronic Pain Clinics: A Prospective Multicenter Cohort Study with One-Year Follow-Up

Background

Interventional Pain Management (IPM) is performed in multidisciplinary chronic pain clinics (MCPC), including a range of invasive techniques to diagnose and treat chronic pain (CP) conditions. Current patterns of use of those techniques in MCPC have not yet been reported.

Objective

We aimed to describe quantitatively and qualitatively the use of IPM and other therapeutic procedures performed on-site at four Portuguese MCPC.

Methods

A prospective cohort study with one-year follow-up was performed in adult patients. A structured case report form was systematically completed at baseline and six and 12 months.

Results

Among 808 patients referred to the MCPC, 17.2% had been prescribed IPM. Patients with IPM were on average younger and had longer CP duration and lower levels of maximum pain and pain interference/disability. The three main diagnoses were low back pain (n = 28), postoperative CP, and knee pain (n = 16 each). From 195 IPM prescribed, nerve blocks (n = 108), radiofrequency (n = 31), and viscosupplementation (n = 22) were the most prevalent. Some IPM techniques were only available in few MCPC. One MCPC did not provide IPM.

Conclusions

IPM are seldom prescribed in Portuguese MCPC. Further studies on IPM safety and effectiveness are necessary for clear understanding the role of these techniques in CP management.