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      Optimal dose of perineural dexmedetomidine to prolong analgesia after brachial plexus blockade: a systematic review and Meta-analysis of 57 randomized clinical trials

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          Abstract

          Background and Objectives

          Peripheral injection of dexmedetomidine (DEX) has been widely used in regional anesthesia to prolong the duration of analgesia. However, the optimal perineural dose of DEX is still uncertain. It is important to elucidate this characteristic because DEX may cause dose-dependent complications. The aim of this meta-analysis was to determine the optimal dose of perineural DEX for prolonged analgesia after brachial plexus block (BPB) in adult patients undergoing upper limb surgery.

          Method

          A search strategy was created to identify suitable randomized clinical trials (RCTs) in Embase, PubMed and The Cochrane Library from inception date to Jan, 2021. All adult patients undergoing upper limb surgery under BPB were eligible. The RCTs comparing DEX as an adjuvant to local anesthetic (LA) with LA alone for BPB were included. The primary outcome was duration of analgesia for perineural DEX. Secondary outcomes included visual analog scale (VAS) in 12 and 24 h, consumption of analgesics in 24 h, and adverse events.

          Results

          Fifty-seven RCTs, including 3332 patients, were identified. The subgroup analyses and regression analyses revealed that perineural DEX dose of 30-50 μg is an appropriate dosage. With short−/intermediate-acting LAs, the mean difference (95% confidence interval [CI]) of analgesia duration with less than and more than 60 μg doses was 220.31 (153.13–287.48) minutes and 68.01 (36.37–99.66) minutes, respectively. With long-acting LAs, the mean differences (95% CI) with less than and more than 60 μg doses were 332.45 (288.43–376.48) minutes and 284.85 (220.31–349.39) minutes.

          Conclusion

          30-50 μg DEX as adjuvant can provides a longer analgesic time compared to LA alone and it did not increase the risk of bradycardia and hypotension.

          Supplementary Information

          The online version contains supplementary material available at 10.1186/s12871-021-01452-0.

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          GRADE guidelines: 3. Rating the quality of evidence.

          Howard Balshem, Mark Helfand, Holger Schünemann … (2011)
          This article introduces the approach of GRADE to rating quality of evidence. GRADE specifies four categories-high, moderate, low, and very low-that are applied to a body of evidence, not to individual studies. In the context of a systematic review, quality reflects our confidence that the estimates of the effect are correct. In the context of recommendations, quality reflects our confidence that the effect estimates are adequate to support a particular recommendation. Randomized trials begin as high-quality evidence, observational studies as low quality. "Quality" as used in GRADE means more than risk of bias and so may also be compromised by imprecision, inconsistency, indirectness of study results, and publication bias. In addition, several factors can increase our confidence in an estimate of effect. GRADE provides a systematic approach for considering and reporting each of these factors. GRADE separates the process of assessing quality of evidence from the process of making recommendations. Judgments about the strength of a recommendation depend on more than just the quality of evidence. Copyright © 2011 Elsevier Inc. All rights reserved.
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            Facilitatory effects of perineural dexmedetomidine on neuraxial and peripheral nerve block: a systematic review and meta-analysis.

            F Abdallah, R Brull (2013)
            Nerve blocks improve postoperative analgesia, but their benefits may be short-lived. This quantitative review examines whether perineural dexmedetomidine as a local anaesthetic (LA) adjuvant for neuraxial and peripheral nerve blocks can prolong the duration of analgesia compared with LA alone. All randomized controlled trials (RCTs) comparing the effect of dexmedetomidine as an LA adjuvant to LA alone on neuraxial and peripheral nerve blocks were reviewed. Sensory block duration, motor block duration, block onset times, analgesic consumption, time to first analgesic request, and side-effects were analysed. were combined using random-effects modelling. A total of 516 patients were analysed from nine RCTs. Five trials investigated dexmedetomidine as part of spinal anaesthesia and four as part of a brachial plexus (BP) block. Sensory block duration was prolonged by 150 min [95% confidence interval (CI): 96, 205, P<0.00001] with intrathecal dexmedetomidine. Perineural dexmedetomidine used in BP block may prolong the mean duration of sensory block by 284 min (95% CI: 1, 566, P=0.05), but this difference did not reach statistical significance. Motor block duration and time to first analgesic request were prolonged for both intrathecal and BP block. Dexmedetomidine produced reversible bradycardia in 7% of BP block patients, but no effect on the incidence of hypotension. No patients experienced respiratory depression. Dexmedetomidine is a potential LA adjuvant that can exhibit a facilitatory effect when administered intrathecally as part of spinal anaesthesia or peripherally as part of a BP block. However, there are presently insufficient safety data to support perineural dexmedetomidine use in the clinical setting.
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              Dexmedetomidine added to levobupivacaine prolongs axillary brachial plexus block.

              Fusun Yegenoglu, Aliye Esmaoglu, Aynur Akin … (2010)
              We evaluated the effect of adding dexmedetomidine to levobupivacaine for axillary brachial plexus blockade. The primary endpoints were the onset and duration of sensory and motor block and duration of analgesia. Sixty patients scheduled for elective forearm and hand surgery were divided into 2 equal groups in a randomized, double-blind fashion. The 4 main nerves in the axilla (musculocutaneus, radial, median, ulnar) were identified using neural stimulation. Patients were assigned randomly to 1 of the 2 groups. In group L (n = 30), 40 mL (200 mg) of 0.5% levobupivacaine + 1 mL saline and in group LD (n = 30), 40 mL (200 mg) of 0.5% levobupivacaine + 1 mL dexmedetomidine were given. Motor and sensory block onset times, block durations, and duration of analgesia were recorded. Demographic data and surgical characteristics were similar in both groups. Sensory and motor block onset times were shorter in group LD than in group L (P < 0.05). Sensory and motor blockade durations were longer in group LD than in group L (P < 0.01). Duration of analgesia was longer in group LD than in group L (P < 0.05). Systolic arterial blood pressure levels in group LD at 10, 15, 30, 45, 60, 90, and 120 minutes were significantly lower than those in group L (P < 0.05). Diastolic arterial blood pressure levels in group LD at 60, 90, and 120 minutes were significantly lower than those in group L (P < 0.05). Heart rate levels in group LD, except basal measurements, were significantly lower than those in group L (P < 0.05). In group LD bradycardia was observed in 7 patients, although there was no bradycardia in group L (P < 0.05). Dexmedetomidine added to levobupivacaine for axillary brachial plexus block shortens the onset time and prolongs the duration of the block and the duration of postoperative analgesia. However, dexmedetomidine also may lead to bradycardia.
              Article 0 comments Cited 101 times – based on 0 reviews     Review now
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                Author and article information

                Contributors
                Yubo Xie: xybdoctor@163.com
                Journal
                Journal ID (nlm-ta): BMC Anesthesiol
                Journal ID (iso-abbrev): BMC Anesthesiol
                Title: BMC Anesthesiology
                Publisher: BioMed Central (London )
                ISSN (Electronic): 1471-2253
                Publication date (Electronic): 28 September 2021
                Publication date PMC-release: 28 September 2021
                Publication date Collection: 2021
                Volume: 21
                Electronic Location Identifier: 233
                Affiliations
                [1 ]GRID grid.412594.f, Department of Anesthesiology, , The First Affiliated Hospital of Guangxi Medical University, ; No. 6 Shuangyong Road, Nanning, 530021 Guangxi Zhuang Autonomous Region China
                [2 ]Department of Anesthesiology, Liuzhou Hospital of Traditional Chinese Medicine, Liuzhou, Guangxi Zhuang Autonomous Region China
                Article
                Publisher ID: 1452
                DOI: 10.1186/s12871-021-01452-0
                PMC ID: 8477554
                PubMed ID: 34583650
                SO-VID: df02212e-a11f-4f6f-a36d-6657a5ea8771
                Copyright © © The Author(s) 2021
                License:

                Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver ( http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

                History
                Date received : 6 February 2021
                Date accepted : 9 September 2021
                Categories
                Subject: Research
                Custom metadata
                issue-copyright-statement © The Author(s) 2021

                ScienceOpen disciplines: Anesthesiology & Pain management
                Keywords: perineural dexmedetomidine,adjuvant,brachial plexus block,meta-analysis
                Data availability:
                ScienceOpen disciplines: Anesthesiology & Pain management
                Keywords: perineural dexmedetomidine, adjuvant, brachial plexus block, meta-analysis

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