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Sayed D, Deer TR, Hagedorn JM, Sayed A, D’Souza RS, Lam CM, Khatri N, Hussaini Z, Pritzlaff SG, Abdullah NM, Tieppo Francio V, Falowski SM, Ibrahim YM, Malinowski MN, Budwany RR, Strand NH, Sochacki KM, Shah A, Dunn TM, Nasseri M, Lee DW, Kapural L, Bedder MD, Petersen EA, Amirdelfan K, Schatman ME, Grider JS. A Systematic Guideline by the ASPN Workgroup on the Evidence, Education, and Treatment Algorithm for Painful Diabetic Neuropathy: SWEET. J Pain Res 2024; 17:1461-1501. [PMID: 38633823 PMCID: PMC11022879 DOI: 10.2147/jpr.s451006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2023] [Accepted: 03/19/2024] [Indexed: 04/19/2024] Open
Abstract
Introduction Painful diabetic neuropathy (PDN) is a leading cause of pain and disability globally with a lack of consensus on the appropriate treatment of those suffering from this condition. Recent advancements in both pharmacotherapy and interventional approaches have broadened the treatment options for PDN. There exists a need for a comprehensive guideline for the safe and effective treatment of patients suffering from PDN. Objective The SWEET Guideline was developed to provide clinicians with the most comprehensive guideline for the safe and appropriate treatment of patients suffering from PDN. Methods The American Society of Pain and Neuroscience (ASPN) identified an educational need for a comprehensive clinical guideline to provide evidence-based recommendations for PDN. A multidisciplinary group of international experts developed the SWEET guideline. The world literature in English was searched using Medline, EMBASE, Cochrane CENTRAL, BioMed Central, Web of Science, Google Scholar, PubMed, Current Contents Connect, Meeting Abstracts, and Scopus to identify and compile the evidence for diabetic neuropathy pain treatments (per section as listed in the manuscript) for the treatment of pain. Manuscripts from 2000-present were included in the search process. Results After a comprehensive review and analysis of the available evidence, the ASPN SWEET guideline was able to rate the literature and provide therapy grades for most available treatments for PDN utilizing the United States Preventive Services Task Force criteria. Conclusion The ASPN SWEET Guideline represents the most comprehensive review of the available treatments for PDN and their appropriate and safe utilization.
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Affiliation(s)
- Dawood Sayed
- Department of Anesthesiology and Pain Medicine, The University of Kansas Medical Center, Kansas City, KS, USA
| | - Timothy Ray Deer
- Pain Services, Spine and Nerve Center of the Virginias, Charleston, WV, USA
| | - Jonathan M Hagedorn
- Department of Anesthesiology and Perioperative Medicine, Mayo Clinic, Rochester, MN, USA
| | - Asim Sayed
- Podiatry/Surgery, Susan B. Allen Memorial Hospital, El Dorado, KS, USA
| | - Ryan S D’Souza
- Department of Anesthesiology and Perioperative Medicine, Mayo Clinic, Rochester, MN, USA
| | - Christopher M Lam
- Department of Anesthesiology and Pain Medicine, The University of Kansas Medical Center, Kansas City, KS, USA
| | - Nasir Khatri
- Interventional Pain Medicine, Novant Spine Specialists, Charlotte, NC, USA
| | - Zohra Hussaini
- Department of Anesthesiology and Pain Medicine, The University of Kansas Medical Center, Kansas City, KS, USA
| | - Scott G Pritzlaff
- Department of Anesthesiology and Pain Medicine, University of California, Davis, Sacramento, CA, USA
| | | | - Vinicius Tieppo Francio
- Department of Anesthesiology and Pain Medicine, The University of Kansas Medical Center, Kansas City, KS, USA
| | | | - Yussr M Ibrahim
- Pain Medicine, Northern Light Eastern Maine Medical Center, Bangor, ME, USA
| | | | - Ryan R Budwany
- Pain Services, Spine and Nerve Center of the Virginias, Charleston, WV, USA
| | | | - Kamil M Sochacki
- Department of Anesthesiology and Perioperative Medicine, Rutgers Robert Wood Johnson, New Brunswick, NJ, USA
| | - Anuj Shah
- Department of Physical Medicine and Rehabilitation, Detroit Medical Center, Detroit, MI, USA
| | - Tyler M Dunn
- Anesthesiology and Pain Medicine, Mayo Clinic, Phoenix, AZ, USA
| | - Morad Nasseri
- Interventional Pain Medicine / Neurology, Boomerang Healthcare, Walnut Creek, CA, USA
| | - David W Lee
- Pain Management Specialist, Fullerton Orthopedic, Fullerton, CA, USA
| | | | - Marshall David Bedder
- Chief of Pain Medicine Service, Augusta VAMC, Augusta, GA, USA
- Associate Professor and Director, Addiction Medicine Fellowship Program, Department Psychiatry and Health Behavior, Medical College of Georgia at Augusta University, Augusta, GA, USA
| | - Erika A Petersen
- Department of Neurosurgery, University of Arkansas for Medical Sciences, Little Rock, AR, USA
| | - Kasra Amirdelfan
- Director of Clinical Research, Boomerang Healthcare, Walnut Creek, CA, USA
| | - Michael E Schatman
- Department of Anesthesiology, Perioperative Care & Pain Medicine, NYU Grossman School of Medicine, New York, NY, USA
- Department of Population Health – Division of Medical Ethics, NYU Grossman School of Medicine, New York, NY, USA
| | - Jay Samuel Grider
- Anesthesiology, Division of Pain Medicine, University of Kentucky College of Medicine, Lexington, KY, USA
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Chapman KB, Sayed D, Lamer T, Hunter C, Weisbein J, Patel KV, Dickerson D, Hagedorn JM, Lee DW, Amirdelfan K, Deer T, Chakravarthy K. Best Practices for Dorsal Root Ganglion Stimulation for Chronic Pain: Guidelines from the American Society of Pain and Neuroscience. J Pain Res 2023; 16:839-879. [PMID: 36942306 PMCID: PMC10024474 DOI: 10.2147/jpr.s364370] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2022] [Accepted: 01/17/2023] [Indexed: 03/14/2023] Open
Abstract
With continued innovations in neuromodulation comes the need for evolving reviews of best practices. Dorsal root ganglion stimulation (DRG-S) has significantly improved the treatment of complex regional pain syndrome (CRPS), and it has broad applicability across a wide range of other conditions. Through funding and organizational leadership by the American Society for Pain and Neuroscience (ASPN), this best practices consensus document has been developed for the selection, implantation, and use of DRG stimulation for the treatment of chronic pain syndromes. This document is composed of a comprehensive narrative literature review that has been performed regarding the role of the DRG in chronic pain and the clinical evidence for DRG-S as a treatment for multiple pain etiologies. Best practice recommendations encompass safety management, implantation techniques, and mitigation of the potential complications reported in the literature. Looking to the future of neuromodulation, DRG-S holds promise as a robust intervention for otherwise intractable pain.
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Affiliation(s)
- Kenneth B Chapman
- The Spine & Pain Institute of New York, New York, NY, USA
- Department of Anesthesiology, Zucker School of Medicine at Hofstra Northwell, Manhasset, NY, USA
- Department of Anesthesiology, NYU Langone Medical Center, New York, NY, USA
- Correspondence: Kenneth B Chapman, NYU Langone Medical Center, Zucker School of Medicine at Hofstra/Northwell, Pain Medicine at Staten Island University Hospital, 1360 Hylan Boulevard, Staten Island, NY, 10305, USA, Email
| | - Dawood Sayed
- Department of Anesthesiology, The University of Kansas Medical Center (KUMC), Kansas City, KS, USA
| | - Tim Lamer
- Department of Anesthesiology and Perioperative Medicine, Division of Pain Medicine, Mayo Clinic, Rochester, MN, USA
| | - Corey Hunter
- Ainsworth Institute of Pain Management, New York, NY, USA
| | | | - Kiran V Patel
- The Spine & Pain Institute of New York, New York, NY, USA
- Department of Anesthesiology, Zucker School of Medicine at Hofstra Northwell, Manhasset, NY, USA
- Department of Anesthesiology, NYU Langone Medical Center, New York, NY, USA
| | - David Dickerson
- Department of Anesthesiology, Critical Care and Pain Medicine, NorthShore University Health System, Evanston, IL, USA
- Department of Anesthesia & Critical Care, University of Chicago, Chicago, IL, USA
| | | | - David W Lee
- Fullerton Orthopedic Surgery Medical Group, Fullerton, CA, USA
| | | | - Timothy Deer
- The Spine and Nerve Center of the Virginias, Charleston, WV, USA
| | - Krishnan Chakravarthy
- Department of Anesthesiology and Pain Medicine, University of California San Diego Health Sciences, San Diego, CA, USA
- VA San Diego Healthcare System, San Diego, CA, USA
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Smith S, Normahani P, Lane T, Hohenschurz-Schmidt D, Oliver N, Davies AH. Prevention and Management Strategies for Diabetic Neuropathy. LIFE (BASEL, SWITZERLAND) 2022; 12:life12081185. [PMID: 36013364 PMCID: PMC9410148 DOI: 10.3390/life12081185] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/02/2022] [Revised: 07/17/2022] [Accepted: 07/28/2022] [Indexed: 11/16/2022]
Abstract
Diabetic neuropathy (DN) is a common complication of diabetes that is becoming an increasing concern as the prevalence of diabetes rapidly rises. There are several types of DN, but the most prevalent and studied type is distal symmetrical polyneuropathy, which is the focus of this review and is simply referred to as DN. It can lead to a wide range of sensorimotor and psychosocial symptoms and is a major risk factor for diabetic foot ulceration and Charcot neuropathic osteoarthropathy, which are associated with high rates of lower limb amputation and mortality. The prevention and management of DN are thus critical, and clinical guidelines recommend several strategies for these based on the best available evidence. This article aims to provide a narrative review of DN prevention and management strategies by discussing these guidelines and the evidence that supports them. First, the epidemiology and diverse clinical manifestations of DN are summarized. Then, prevention strategies such as glycemic control, lifestyle modifications and footcare are discussed, as well as the importance of early diagnosis. Finally, neuropathic pain management strategies and promising novel therapies under investigation such as neuromodulation devices and nutraceuticals are reviewed.
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Affiliation(s)
- Sasha Smith
- Section of Vascular Surgery, Department of Surgery and Cancer, Imperial College London, London W6 8RF, UK; (S.S.); (P.N.); (T.L.)
- Imperial Vascular Unit, Imperial College Healthcare NHS Trust, London W6 8RF, UK
| | - Pasha Normahani
- Section of Vascular Surgery, Department of Surgery and Cancer, Imperial College London, London W6 8RF, UK; (S.S.); (P.N.); (T.L.)
- Imperial Vascular Unit, Imperial College Healthcare NHS Trust, London W6 8RF, UK
| | - Tristan Lane
- Section of Vascular Surgery, Department of Surgery and Cancer, Imperial College London, London W6 8RF, UK; (S.S.); (P.N.); (T.L.)
- Department of Vascular Surgery, Cambridge University Hospitals NHS Foundation Trust, Cambridge CB2 0QQ, UK
| | - David Hohenschurz-Schmidt
- Pain Research Group, Department of Surgery and Cancer, Imperial College London, London SW10 9NH, UK;
| | - Nick Oliver
- Section of Metabolic Medicine, Department of Metabolism, Digestion and Reproduction, Imperial College London, London W2 1PG, UK;
- Division of Medicine and Integrated Care, Imperial College Healthcare NHS Trust, London W2 1NY, UK
| | - Alun Huw Davies
- Section of Vascular Surgery, Department of Surgery and Cancer, Imperial College London, London W6 8RF, UK; (S.S.); (P.N.); (T.L.)
- Imperial Vascular Unit, Imperial College Healthcare NHS Trust, London W6 8RF, UK
- Correspondence:
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Smith S, Normahani P, Lane T, Hohenschurz-Schmidt D, Oliver N, Davies AH. Pathogenesis of Distal Symmetrical Polyneuropathy in Diabetes. LIFE (BASEL, SWITZERLAND) 2022; 12:life12071074. [PMID: 35888162 PMCID: PMC9319251 DOI: 10.3390/life12071074] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/01/2022] [Revised: 07/11/2022] [Accepted: 07/13/2022] [Indexed: 12/13/2022]
Abstract
Distal symmetrical polyneuropathy (DSPN) is a serious complication of diabetes associated with significant disability and mortality. Although more than 50% of people with diabetes develop DSPN, its pathogenesis is still relatively unknown. This lack of understanding has limited the development of novel disease-modifying therapies and left the reasons for failed therapies uncertain, which is critical given that current management strategies often fail to achieve long-term efficacy. In this article, the pathogenesis of DSPN is reviewed, covering pathogenic changes in the peripheral nervous system, microvasculature and central nervous system (CNS). Furthermore, the successes and limitations of current therapies are discussed, and potential therapeutic targets are proposed. Recent findings on its pathogenesis have called the definition of DSPN into question and transformed the disease model, paving the way for new research prospects.
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Affiliation(s)
- Sasha Smith
- Section of Vascular Surgery, Department of Surgery and Cancer, Imperial College London, London W6 8RF, UK; (S.S.); (P.N.); (T.L.)
- Imperial Vascular Unit, Imperial College Healthcare NHS Trust, London W6 8RF, UK
| | - Pasha Normahani
- Section of Vascular Surgery, Department of Surgery and Cancer, Imperial College London, London W6 8RF, UK; (S.S.); (P.N.); (T.L.)
- Imperial Vascular Unit, Imperial College Healthcare NHS Trust, London W6 8RF, UK
| | - Tristan Lane
- Section of Vascular Surgery, Department of Surgery and Cancer, Imperial College London, London W6 8RF, UK; (S.S.); (P.N.); (T.L.)
- Department of Vascular Surgery, Cambridge University Hospitals NHS Foundation Trust, Cambridge CB2 0QQ, UK
| | - David Hohenschurz-Schmidt
- Pain Research Group, Department of Surgery and Cancer, Imperial College London, London SW10 9NH, UK;
| | - Nick Oliver
- Section of Metabolic Medicine, Department of Metabolism, Digestion and Reproduction, Imperial College London, London W2 1PG, UK;
- Division of Medicine and Integrated Care, Imperial College Healthcare NHS Trust, London W2 1NY, UK
| | - Alun Huw Davies
- Section of Vascular Surgery, Department of Surgery and Cancer, Imperial College London, London W6 8RF, UK; (S.S.); (P.N.); (T.L.)
- Imperial Vascular Unit, Imperial College Healthcare NHS Trust, London W6 8RF, UK
- Correspondence:
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D'Souza RS, Barman R, Joseph A, Abd-Elsayed A. Evidence-Based Treatment of Painful Diabetic Neuropathy: a Systematic Review. Curr Pain Headache Rep 2022; 26:583-594. [PMID: 35716275 DOI: 10.1007/s11916-022-01061-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/26/2022] [Indexed: 12/25/2022]
Abstract
PURPOSE OF REVIEW Painful diabetic neuropathy (PDN) manifests with pain typically in the distal lower extremities and can be challenging to treat. The authors appraised the literature for evidence on conservative, pharmacological, and neuromodulation treatment options for PDN. RECENT FINDINGS Intensive glycemic control with insulin in patients with type 1 diabetes may be associated with lower odds of distal symmetric polyneuropathy compared to patients who receive conventional insulin therapy. First-line pharmacologic therapy for PDN includes gabapentinoids (pregabalin and gabapentin) and duloxetine. Additional pharmacologic modalities that are approved by the Food and Drug Administration (FDA) but are considered second-line agents include tapentadol and 8% capsaicin patch, although studies have revealed modest treatment effects from these modalities. There is level I evidence on the use of dorsal column spinal cord stimulation (SCS) for treatment of PDN, delivering either a 10-kHz waveform or tonic waveform. In summary, this review provides an overview of treatment options for PDN. Furthermore, it provides updates on the level of evidence for SCS therapy in cases of PDN refractory to conventional medical therapy.
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Affiliation(s)
- Ryan S D'Souza
- Department of Anesthesiology and Perioperative Medicine, Mayo Clinic, Rochester, MN, USA
| | - Ross Barman
- Department of Anesthesiology and Perioperative Medicine, Mayo Clinic, Rochester, MN, USA
| | - Amira Joseph
- Department of Anesthesiology and Perioperative Medicine, Mayo Clinic, Rochester, MN, USA
| | - Alaa Abd-Elsayed
- Department of Anesthesiology and Perioperative Medicine, University of Wisconsin, Madison, WI, USA.
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D'Souza RS, Langford B, Dombovy-Johnson M, Abd-Elsayed A. Neuromodulation Interventions for the Treatment of Painful Diabetic Neuropathy: a Systematic Review. Curr Pain Headache Rep 2022; 26:365-377. [PMID: 35226258 DOI: 10.1007/s11916-022-01035-9] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/30/2021] [Indexed: 11/25/2022]
Abstract
PURPOSE OF REVIEW Painful diabetic neuropathy (PDN) is a prevalent and debilitating condition, characterized by severe burning, tingling, and lancinating pain usually located in the distal lower extremities. In addition to manifesting with severe pain, PDN may also be associated with poor quality of life and sleep, mood disorders, burns, falls, and social withdrawal. The authors appraised the current body of literature for evidence on neuromodulation interventions for PDN. RECENT FINDINGS In patients with refractory PDN unresponsive to conventional medical management (glucose optimization and oral analgesic medications), there is level I evidence supporting the use of 10-kHz and tonic dorsal column spinal cord stimulation (SCS). Included studies reported significant associations between 10-kHz and tonic dorsal column SCS and superior analgesic outcomes, physical functioning, and patient satisfaction. Current level of evidence remains limited for other modalities of neuromodulation for PDN including burst SCS (level II-3), dorsal root ganglion SCS (level III), and peripheral nerve stimulation (level II-3). Some studies reported improvements in neurological physical examination, sensory testing, and/or reflex testing in patients undergoing 10-kHz SCS for treatment of PDN. In summary, the purpose of this review is to equip provider with important updates on the use of neuromodulation interventions for the treatment of PDN that is refractory to conventional medical therapy, with current level I evidence supporting use of 10-kHz and tonic SCS for PDN.
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Affiliation(s)
- Ryan S D'Souza
- Department of Anesthesiology and Perioperative Medicine, Mayo Clinic, Rochester, MN, USA
| | - Brendan Langford
- Department of Anesthesiology and Perioperative Medicine, Mayo Clinic, Rochester, MN, USA
| | | | - Alaa Abd-Elsayed
- Department of Anesthesiology and Perioperative Medicine, University of Wisconsin, Madison, WI, USA.
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Omosor E, Lee T, Hussain N. A Case Series of Permanent Dorsal Root Ganglion Stimulation. Cureus 2022; 14:e21193. [PMID: 35165634 PMCID: PMC8839444 DOI: 10.7759/cureus.21193] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/13/2022] [Indexed: 11/30/2022] Open
Abstract
Introduction Neuropathic pain commonly causes high levels of pain that impairs multiple facets of the lives of patients. Multiple first-line treatments such as physical therapy and pharmacological intervention exist. Treatment refractory to these interventions may be considered for spinal cord stimulation (SCS). However, modest rates of meaningful relief leave room for improvement. Dorsal root ganglion stimulation (DRGS) has been touted to be a viable alternative solution to SCS with more specific targets and, consequently, fewer side effects. Thus, DRGS has been accepted as a better alternative to spinal cord stimulation. In contrast, we report a series of DRGS patients who had lower rates of meaningful pain relief than what was reported in the literature. Methods We present a series of 11 patients who underwent both DRGS trial and subsequent permanent implantation with negative outcomes (defined by ≥ 50% of pre-surgical pain) in 55% of patients. Patient records were searched for comorbidities that could potentially affect the DRGS implant (diabetes, cancer, smoking, age > 70 years old). Once delineated, the predictive value of each comorbidity for negative outcomes was estimated. Results Eighteen patients had a successful DRGS trial which was defined as a ≥ 50% pain reduction as well as increased ability to perform daily activities. Seven patients elected not to proceed with the permanent DRGS. Of the 11 remaining patients that had the permanent DRGS, four patients reported being completely pain-free ≥ one month following implantation, one reported a significant increase in pain improvement at four months post-operation, and six patients reported pain that was ≥ 50% of their pre-surgical pain 4-12 months following implantation. Conclusion In our case series, we observed a discrepancy between DRGS trial outcomes and outcomes following permanent implantation. We found that a stronger correlation may exist between worse outcomes and smoking. Older age, the presence of diabetes, and cancer had more modest associations. These comorbidities may have value as tests for predicting negative outcomes of permanent DRGS implantation. Additionally, we hypothesized that this could also be due to the presence of psychological factors which obscure the true result of the DRGS trial. Thus, we suggest that DRGS be prescribed with caution in these patient populations, and use comorbidities to test for the likelihood of negative outcomes. Limitations of this study are those that are intrinsic to a retrospective case series.
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D'Souza RS, Kubrova E, Her YF, Barman RA, Smith BJ, Alvarez GM, West TE, Abd-Elsayed A. Dorsal Root Ganglion Stimulation for Lower Extremity Neuropathic Pain Syndromes: An Evidence-Based Literature Review. Adv Ther 2022; 39:4440-4473. [PMID: 35994195 PMCID: PMC9464732 DOI: 10.1007/s12325-022-02244-9] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2022] [Accepted: 06/23/2022] [Indexed: 01/30/2023]
Abstract
Dorsal root ganglion stimulation (DRG-S) is a form of selective neuromodulation therapy that targets the dorsal root ganglion. DRG-S offers analgesia in a variety of chronic pain conditions and is approved for treatment of complex regional pain syndrome (CRPS) by the US Food and Drug Administration (FDA). There has been increasing utilization of DRG-S to treat various neuropathic pain syndromes of the lower extremity, although evidence remains limited to one randomized controlled trial and 39 observational studies. In this review, we appraised the current evidence for DRG-S in the treatment of lower extremity neuropathic pain using the Grading of Recommendations, Assessment, Development, and Evaluations (GRADE) criteria. The primary outcome was change in pain intensity after DRG-S compared to baseline. We stratified presentation of results based of type of neuropathy (CRPS, painful diabetic neuropathy, mononeuropathy, polyneuropathy) as well as location of neuropathy (hip, knee, foot). Future powered randomized controlled trials with homogeneous participants are warranted.
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Affiliation(s)
- Ryan S D'Souza
- Division of Pain Medicine, Department of Anesthesiology and Perioperative Medicine, Mayo Clinic, Rochester, MN, USA
| | - Eva Kubrova
- Department of Physical Medicine and Rehabilitation, Mayo Clinic, Rochester, MN, USA
| | - Yeng F Her
- Division of Pain Medicine, Department of Anesthesiology and Perioperative Medicine, Mayo Clinic, Rochester, MN, USA
| | - Ross A Barman
- Division of Pain Medicine, Department of Anesthesiology and Perioperative Medicine, Mayo Clinic, Rochester, MN, USA
| | - Brandon J Smith
- Department of Physical Medicine and Rehabilitation, Mayo Clinic, Rochester, MN, USA
| | - Gabriel M Alvarez
- Department of Physical Medicine and Rehabilitation, Mayo Clinic, Rochester, MN, USA
| | - Tyler E West
- Division of Pain Medicine, Department of Anesthesiology and Perioperative Medicine, Mayo Clinic, Rochester, MN, USA
| | - Alaa Abd-Elsayed
- Department of Anesthesiology, University of Wisconsin, Madison, WI, USA.
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