Practical Advices for Treating Chronic Pain in the Time of COVID-19: A Narrative Review Focusing on Interventional Techniques

Background: Since the management of chronic pain has become even more challenging secondary to the occurrence of SARS-CoV-2 outbreaks, we developed an exhaustive narrative review of the scientific literature, providing practical advices regarding the management of chronic pain in patients with suspected, presumed, or confirmed SARS-CoV-2 infection. We focused particularly on interventional procedures, where physicians are in closer contact with patients. Methods: Narrative Review of the most relevant articles published between June and December of 2020 that focused on the treatment of chronic pain in COVID-19 patients. Results: Careful triage of patients is mandatory in order to avoid overcrowding of hospital spaces. Telemedicine could represent a promising tool to replace in-person visits and as a screening tool prior to admitting patients to hospitals. Opioid medications can affect the immune response, and therefore, care should be taken prior to initiating new treatments and increasing dosages. Epidural steroids should be avoided or limited to the lowest effective dose. Non urgent interventional procedures such as spinal cord stimulation and intrathecal pumps should be postponed. The use of personal protective equipment and disinfectants represent an important component of the strategy to prevent viral spread to operators and cross-infection between patients due to the SARS-CoV-2 outbreaks.

Safety of epidural steroids: a review

Spine disease is one of the most common musculoskeletal diseases, especially in an aging society. An epidural steroid injection (ESI) is a highly effective treatment that can be used to bridge the gap between physical therapy and surgery. Recently, it has been increasingly used clinically. The purpose of this article is to review the complications of corticosteroids administered epidurally. Common complications include: hypothalamic-pituitary-adrenal (HPA) axis suppression, adrenal insufficiency, iatrogenic Cushing's syndrome, hyperglycemia, osteoporosis, and immunological or infectious diseases. Other less common complications include psychiatric problems and ocular ailments. However, the incidence of complications related to epidural steroids is not high, and most of them are not serious. The use of nonparticulate steroids is recommended to minimize the complications associated with epidural steroids. The appropriate interval and dosage of ESI are disputed. We recommend that the selection of appropriate ESI protocol should be based on the suppression of HPA axis, which reflects the systemic absorption of the corticosteroid.

Is Epidural Injection of Sodium Chloride Solution a True Placebo or an Active Control Agent? A Systematic Review and Meta-Analysis

BACKGROUND: Epidural injections have been extensively used since their description in 1901, and steroids since their first utilization in 1952. Multiple randomized controlled trials and systematic reviews have reached discordant conclusions regarding the effectiveness of sodium chloride solution and steroids in managing spinal pain. True placebo-controlled trials with the injection of an inactive substance to unrelated structures have been nonexistent. Consequently, the discussions continue to escalate, seemingly without proper discourse. In this review, we sought to assess the true placebo nature of saline and the effectiveness of steroids. OBJECTIVES: This assessment of sodium chloride solution is undertaken to assess if it is a true placebo when injected into the epidural space, is effective alone, and whether steroids are effective when injected with sodium chloride solution rather than local anesthetic in managing spinal pain. STUDY DESIGN: A systematic review of randomized controlled trials utilizing sodium chloride solution alone, steroids alone, or sodium chloride solution with steroids in managing spinal pain secondary to disc herniation or spinal stenosis. METHODS: The systematic review was performed utilizing Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA). Cochrane review criteria and Interventional Pain Management techniques--Quality Appraisal of Reliability and Risk of Bias Assessment (IPM–QRB) was used to assess the methodological quality assessment. Qualitative analysis was performed by utilizing best evidence synthesis principles, and quantitative analysis was performed utilizing meta-analysis with conventional methodology and single-arm meta-analysis. PubMed, Cochrane Library, US National Guideline Clearinghouse, Google Scholar, and prior systematic reviews and reference lists were utilized in the literature search from 1966 through December 2018. The evidence was summarized utilizing principles of best evidence synthesis on a scale of 1 to 5. Outcome measures for the present analysis, 20% improvement from the baseline pain scores or disability scores was considered clinically significant. Effectiveness was determined short-term if it was less than 6 months, whereas longer than 6 months was considered to be long-term. RESULTS: Of the 8 trials meeting inclusion criteria, 2 trials utilized fluoroscopic imaging and one study utilized ultrasound. All other studies performed the procedure without fluoroscopy. With dual-arm meta-analysis, there was no significant difference between epidural sodium chloride solution and epidural steroids with sodium chloride solution. Utilizing single-arm analysis, both epidural saline and epidural steroids with saline were effective in reducing 20% of pain, however, only reducing disability scores by 10% to 12%. Based on the qualitative analysis, epidural saline and epidural steroids with saline showed effect beyond placebo and showed level I, or strong evidence, that neither epidural saline, nor epidural steroids with saline are placebo and that both are effective. LIMITATIONS: Despite 8 randomized controlled trials, only 2 of them utilized fluoroscopy. Overall evidence is considered less than optimal and further studies elucidating these actions are strongly recommended. CONCLUSIONS: The findings of this systematic review and meta-analysis show that epidurally administered sodium chloride solution and sodium chloride solution with steroids may be effective in managing low back and lower extremity pain. Consequently, the findings of this review provide information that epidurally administered sodium chloride solution is not a true placebo. KEY WORDS: Chronic low back pain, epidural injections, local anesthetic, sodium chloride solution, steroids, placebo effect

Combination of caudal epidural steroids with oral gabapentin for radicular low back pain: a prospective observational study

Introduction: The physical, socioeconomic and psychological burden of low back pain is enormous. The poor socioeconomic condition and geographical constrains confines people to limited health facilities. The objective of the study was to evaluate whether combination of caudal epidural steroids with local anaesthetics and gabapentin is effective for radicular low back pain in the rural Nepal setting. Methods: It was a prospective observational study including 300 patients with radicular low back pain done over a period of 6 months (13/4/2016 to 30/10/2016). All participants received caudal epidural steroid injection (6ml 2% Xylocaine with adrenaline plus Depomedroxy steroid 80mg plus 12 ml distilled water) and 200 mg gabapentin daily for three months. All patients were followed up for three months and were evaluated. Results: Mean age of presentation was 41.21 years (SD ± 11.02) with majority of farmers (42.31%). Mean Numerical Rating Scale at the baseline was 8.01(SD±1.00) and at the first follow up was 3.98 (SD±0.83) (p <0.001). Mean Oswestry Disability Index at baseline was7.85 (SD±0.98) and at the first follow up was 4.04 (SD±0.80) (p <0.001). Straight Leg Raising Test at baseline was less than 70° in 84.7% which improved to more than 70° in 87.9% of the patients (p-value <0.001). Conclusion: Caudal epidural steroids combined with gabapentin is safe, economical and technically less demanding. This treatment modality can be used with good outcomes in the rural areas with limited diagnostic and therapeutic facilities.