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Drug Design, Development and Therapy 2023Peripheral nerve block technology is important to balanced anesthesia technology. It can effectively reduce opioid usage. It is the key to enhance clinical... (Review)
Review
Peripheral nerve block technology is important to balanced anesthesia technology. It can effectively reduce opioid usage. It is the key to enhance clinical rehabilitation as an important part of the multimodal analgesia scheme. The emergence of ultrasound technology has accelerated peripheral nerve block technology development. It can directly observe the nerve shape, surrounding tissue, and diffusion path of drugs. It can also reduce the dosage of local anesthetics by improving positioning accuracy while enhancing the block's efficacy. Dexmedetomidine is a highly selective drug α-adrenergic receptor agonist. Dexmedetomidine has the characteristics of sedation, analgesia, anti-anxiety, inhibition of sympathetic activity, mild respiratory inhibition, and stable hemodynamics. Numerous studies have revealed that dexmedetomidine in peripheral nerve blocks can shorten the onset time of anesthesia and prolong the time of sensory and motor nerve blocks. Although dexmedetomidine was approved by the European Drug Administration for sedation and analgesia in 2017, it has not yet been approved by the US Food and Drug Administration (FDA). It is used as a non-label drug as an adjuvant. Therefore, the risk-benefit ratio must be evaluated when using these drugs as adjuvants. This review explains the pharmacology and mechanism of dexmedetomidine, the effect of dexmedetomidine on various peripheral nerve block as an adjuvant, and compare it with other types of adjuvants. We summarized and reviewed the application progress of dexmedetomidine as an adjuvant in nerve block and look forward to its future research direction.
Topics: United States; Dexmedetomidine; Adjuvants, Immunologic; Anesthetics, Local; Nerve Block; Adrenergic alpha-2 Receptor Agonists; Peripheral Nerves
PubMed: 37220544
DOI: 10.2147/DDDT.S405294 -
Proceedings of the National Academy of... Oct 2019Observing the structure and regeneration of the myelin sheath in peripheral nerves following injury and during repair would help in understanding the pathogenesis and...
Observing the structure and regeneration of the myelin sheath in peripheral nerves following injury and during repair would help in understanding the pathogenesis and treatment of neurological diseases caused by an abnormal myelin sheath. In the present study, transmission electron microscopy, immunofluorescence staining, and transcriptome analyses were used to investigate the structure and regeneration of the myelin sheath after end-to-end anastomosis, autologous nerve transplantation, and nerve tube transplantation in a rat model of sciatic nerve injury, with normal optic nerve, oculomotor nerve, sciatic nerve, and Schwann cells used as controls. The results suggested that the double-bilayer was the structural unit that constituted the myelin sheath. The major feature during regeneration was the compaction of the myelin sheath, wherein the distance between the 2 layers of cell membrane in the double-bilayer became shorter and the adjacent double-bilayers tightly closed together and formed the major dense line. The expression level of myelin basic protein was positively correlated with the formation of the major dense line, and the compacted myelin sheath could not be formed without the anchoring of the lipophilin particles to the myelin sheath.
Topics: Animals; Axons; Myelin Sheath; Nerve Regeneration; Peripheral Nerve Injuries; Rats
PubMed: 31611410
DOI: 10.1073/pnas.1910292116 -
Minerva Anestesiologica Jul 2019Pain is the most common complaint amongst trauma patients throughout the perioperative period. Multimodal analgesia is currently being regarded the mainstay, with... (Review)
Review
Pain is the most common complaint amongst trauma patients throughout the perioperative period. Multimodal analgesia is currently being regarded the mainstay, with regional anesthesia techniques constituting an integral part of it. Ultrasound imaging techniques display a plethora of advantages that have pervaded regional anesthesia practice. In this review, we set out to provide several examples of injuries, to elucidate the precise anatomy of fractured bones (osteotomes), and to elaborate on certain peripheral nerve blocks employed in pain management of trauma patients. Controversies/special considerations pertaining to peripheral nerve blocks also dictate thorough analysis: as such, acute compartment syndrome, acute peripheral nerve injuries, regional anesthesia in awake or anesthetized patients, continuous peripheral nerve blocks, positioning limitations and, finally, ultrasound imaging versus neurostimulation techniques are extensively reviewed.
Topics: Acute Pain; Analgesia; Anesthesia, Conduction; Brachial Plexus; Compartment Syndromes; Emergency Medical Services; Fractures, Bone; Humans; Lower Extremity; Nerve Block; Pain Management; Pain, Postoperative; Patient Positioning; Peripheral Nerve Injuries; Peripheral Nerves; Ultrasonography, Interventional; Upper Extremity
PubMed: 30735016
DOI: 10.23736/S0375-9393.19.13145-8 -
Hand (New York, N.Y.) Jan 2023
Topics: Humans; Peripheral Nerves; Peripheral Nerve Injuries
PubMed: 36698251
DOI: 10.1177/15589447221150669 -
Pain Physician Mar 2021Peripheral nerve stimulation (PNS) has been increasingly used to manage acute and chronic pain. However, the level of clinical evidence to support its use is not clear.
BACKGROUND
Peripheral nerve stimulation (PNS) has been increasingly used to manage acute and chronic pain. However, the level of clinical evidence to support its use is not clear.
OBJECTIVES
To assess the clinical evidence of PNS in the treatment of acute or chronic pain.
STUDY DESIGN
A systematic review of the efficacy and safety of PNS in managing acute or chronic pain.
METHODS
Data sources were PubMed, Cochrane Library, Scopus, CINAHL Plus, Google Scholar, and reference lists. The literature search was performed up to December 2019. Study selection included randomized trials, observational studies, and case reports of PNS in acute or chronic pain. Data extraction and methodological quality assessment were performed utilizing Cochrane review methodologic quality assessment and Interventional Pain Management Techniques-Quality Appraisal of Reliability and Risk of Bias Assessment (IPM-QRB) and Interventional Pain Management Techniques-Quality Appraisal of Reliability and Risk of Bias Assessment for Nonrandomized Studies (IPM-QRBNR). The evidence was summarized utilizing principles of best evidence synthesis on a scale of 1 to 5. Data syntheses: 227 studies met inclusion criteria and were included in qualitative synthesis.
RESULTS
Evidence synthesis based on randomized controlled trials (RCTs) and observational studies showed Level I and II evidence of PNS in chronic migraine headache; Level II evidence in cluster headache, postamputation pain, chronic pelvic pain, chronic low back and lower extremity pain; and Level IV evidence in peripheral neuropathic pain, and postsurgical pain. Peripheral field stimulation has Level II evidence in chronic low back pain, and Level IV evidence in cranial pain.
LIMITATIONS
Lack of high-quality RCTs. Meta-analysis was not possible due to wide variations in experimental design, research protocol, and heterogeneity of study population.
CONCLUSIONS
The findings of this systematic review suggest that PNS may be effective in managing chronic headaches, postamputation pain, chronic pelvic pain, and chronic low back and lower extremity pain, with variable levels of evidence in favor of this technique.
Topics: Acute Pain; Chronic Pain; Humans; Pain Management; Peripheral Nerves; Reproducibility of Results; Transcutaneous Electric Nerve Stimulation
PubMed: 33740342
DOI: No ID Found -
The Journal of Clinical Investigation Nov 2021Peripheral nerves have the capacity for regeneration, but the rate of regeneration is so slow that many nerve injuries lead to incomplete recovery and permanent...
Peripheral nerves have the capacity for regeneration, but the rate of regeneration is so slow that many nerve injuries lead to incomplete recovery and permanent disability for patients. Macrophages play a critical role in the peripheral nerve response to injury, contributing to both Wallerian degeneration and nerve regeneration, and their function has recently been shown to be dependent on intracellular metabolism. To date, the impact of their intracellular metabolism on peripheral nerve regeneration has not been studied. We examined conditional transgenic mice with selective ablation in macrophages of solute carrier family 16, member 1 (Slc16a1), which encodes monocarboxylate transporter 1 (MCT1), and found that MCT1 contributed to macrophage metabolism, phenotype, and function, specifically in regard to phagocytosis and peripheral nerve regeneration. Adoptive cell transfer of wild-type macrophages ameliorated the impaired nerve regeneration in macrophage-selective MCT1-null mice. We also developed a mouse model that overexpressed MCT1 in macrophages and found that peripheral nerves in these mice regenerated more rapidly than in control mice. Our study provides further evidence that MCT1 has an important biological role in macrophages and that manipulations of macrophage metabolism can enhance recovery from peripheral nerve injuries, for which there are currently no approved medical therapies.
Topics: Animals; Female; Macrophages; Male; Mice; Mice, Transgenic; Monocarboxylic Acid Transporters; Nerve Regeneration; Peripheral Nerve Injuries; Sciatic Nerve; Symporters
PubMed: 34491913
DOI: 10.1172/JCI141964 -
Anesthesiology Jul 2021Percutaneous peripheral nerve stimulation is an analgesic technique involving the percutaneous implantation of a lead followed by the delivery of electric current using... (Randomized Controlled Trial)
Randomized Controlled Trial
BACKGROUND
Percutaneous peripheral nerve stimulation is an analgesic technique involving the percutaneous implantation of a lead followed by the delivery of electric current using an external pulse generator. Percutaneous peripheral nerve stimulation has been used extensively for chronic pain, but only uncontrolled series have been published for acute postoperative pain. The current multicenter study was undertaken to (1) determine the feasibility and optimize the protocol for a subsequent clinical trial and (2) estimate the treatment effect of percutaneous peripheral nerve stimulation on postoperative pain and opioid consumption.
METHODS
Preoperatively, an electrical lead was percutaneously implanted to target the sciatic nerve for major foot/ankle surgery (e.g., hallux valgus correction), the femoral nerve for anterior cruciate ligament reconstruction, or the brachial plexus for rotator cuff repair, followed by a single injection of long-acting local anesthetic along the same nerve/plexus. Postoperatively, participants were randomized to 14 days of either electrical stimulation (n = 32) or sham stimulation (n = 34) using an external pulse generator in a double-masked fashion. The dual primary treatment effect outcome measures were (1) cumulative opioid consumption (in oral morphine equivalents) and (2) mean values of the "average" daily pain scores measured on the 0 to 10 Numeric Rating Scale within the first 7 postoperative days.
RESULTS
During the first 7 postoperative days, opioid consumption in participants given active stimulation was a median (interquartile range) of 5 mg (0 to 30) versus 48 mg (25 to 90) in patients given sham treatment (ratio of geometric means, 0.20 [97.5% CI, 0.07 to 0.57]; P < 0.001). During this same period, the average pain intensity in patients given active stimulation was a mean ± SD of 1.1 ± 1.1 versus 3.1 ± 1.7 in those given sham (difference, -1.8 [97.5% CI, -2.6 to -0.9]; P < 0.001).
CONCLUSIONS
Percutaneous peripheral nerve stimulation reduced pain scores and opioid requirements free of systemic side effects during at least the initial week after ambulatory orthopedic surgery.
Topics: Feasibility Studies; Female; Humans; Implantable Neurostimulators; Male; Middle Aged; Pain, Postoperative; Peripheral Nerves; Pilot Projects; Transcutaneous Electric Nerve Stimulation; Treatment Outcome
PubMed: 33856424
DOI: 10.1097/ALN.0000000000003776 -
Anesthesiology Feb 2021The authors provide a comprehensive summary of all randomized, controlled trials (n = 76) involving the clinical administration of liposomal bupivacaine (Exparel; Pacira... (Review)
Review
The authors provide a comprehensive summary of all randomized, controlled trials (n = 76) involving the clinical administration of liposomal bupivacaine (Exparel; Pacira Pharmaceuticals, USA) to control postoperative pain that are currently published. When infiltrated surgically and compared with unencapsulated bupivacaine or ropivacaine, only 11% of trials (4 of 36) reported a clinically relevant and statistically significant improvement in the primary outcome favoring liposomal bupivacaine. Ninety-two percent of trials (11 of 12) suggested a peripheral nerve block with unencapsulated bupivacaine provides superior analgesia to infiltrated liposomal bupivacaine. Results were mixed for the 16 trials comparing liposomal and unencapsulated bupivacaine, both within peripheral nerve blocks. Overall, of the trials deemed at high risk for bias, 84% (16 of 19) reported statistically significant differences for their primary outcome measure(s) compared with only 14% (4 of 28) of those with a low risk of bias. The preponderance of evidence fails to support the routine use of liposomal bupivacaine over standard local anesthetics.
Topics: Anesthetics, Local; Bupivacaine; Humans; Liposomes; Nerve Block; Pain Management; Pain, Postoperative; Peripheral Nerves; Treatment Outcome
PubMed: 33372949
DOI: 10.1097/ALN.0000000000003630 -
British Journal of Anaesthesia Apr 2021Rebound pain is a common, yet under-recognised acute increase in pain severity after a peripheral nerve block (PNB) has receded, typically manifesting within 24 h after...
BACKGROUND
Rebound pain is a common, yet under-recognised acute increase in pain severity after a peripheral nerve block (PNB) has receded, typically manifesting within 24 h after the block was performed. This retrospective cohort study investigated the incidence and factors associated with rebound pain in patients who received a PNB for ambulatory surgery.
METHODS
Ambulatory surgery patients who received a preoperative PNB between March 2017 and February 2019 were included. Rebound pain was defined as the transition from well-controlled pain (numerical rating scale [NRS] ≤3) while the block is working to severe pain (NRS ≥7) within 24 h of block performance. Patient, surgical, and anaesthetic factors were analysed for association with rebound pain by univariate, multivariable, and machine learning methods.
RESULTS
Four hundred and eighty-two (49.6%) of 972 included patients experienced rebound pain as per the definition. Multivariable analysis showed that the factors independently associated with rebound pain were younger age (odds ratio [OR] 0.98; 95% confidence interval [CI] 0.97-0.99), female gender (OR 1.52 [1.15-2.02]), surgery involving bone (OR 1.82 [1.38-2.40]), and absence of perioperative i.v. dexamethasone (OR 1.78 [1.12-2.83]). Despite a high incidence of rebound pain, there were high rates of patient satisfaction (83.2%) and return to daily activities (96.5%).
CONCLUSIONS
Rebound pain occurred in half of the patients and showed independent associations with age, female gender, bone surgery, and absence of intraoperative use of i.v. dexamethasone. Until further research is available, clinicians should continue to use preventative strategies, especially for patients at higher risk of experiencing rebound pain.
Topics: Adolescent; Adult; Aged; Aged, 80 and over; Ambulatory Surgical Procedures; Autonomic Nerve Block; Cohort Studies; Female; Follow-Up Studies; Humans; Male; Middle Aged; Pain Measurement; Pain, Postoperative; Peripheral Nerves; Retrospective Studies; Young Adult
PubMed: 33390261
DOI: 10.1016/j.bja.2020.10.035 -
Ugeskrift For Laeger Nov 2022Rebound pain is a severe post-surgical pain which occurs after the resolution of peripheral nerve blocks. Current literature suggests that rebound pain affects around... (Review)
Review
Rebound pain is a severe post-surgical pain which occurs after the resolution of peripheral nerve blocks. Current literature suggests that rebound pain affects around 50% of those receiving a peripheral nerve block. Possible interventions constitute patient education, bridging analgesia from the resolution of the nerve block, multimodal analgesic regimes, block adjuvants, or continuous pain catheters. Factors such as low age, female gender, bone surgery, and absence of IV dexamethasone are likely to be associated with rebound pain, as argued in this review.
Topics: Female; Humans; Anesthesia, Conduction; Pain Management; Analgesia; Pain, Postoperative; Peripheral Nerves
PubMed: 36426833
DOI: No ID Found