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Low-dose Intravenous Dexamethasone at Different Times as Adjunvants for Brachial Plexus Blocks

Analgesia Clinical Trial

Official title:
Comparison of the Effects of Different Time of Intravenous Dexamethasone on Brachial Plexus Block: a Randomized Control Study

Clinical Trial Summary

Dexamethasone has been tested as an effective adjuvant to prolong the effect of local anesthetics for peripheral nerve blocks, both perineurally and intravenously. The purpose of this study is to investigate the effect of the addition of dexamethasone (5mg) at different time to a standard ropivacaine solution (0.5%) on analgesic duration of interscalene block.

Clinical Trial Description

Interscalene brachial plexus block (ISB) is regarded as the standard of care for anesthesia and analgesia for shoulder surgery by providing the superior analgesia and reducing opioid consumption. After several hours when the effects of single injection ISB wear off, the patients often suffer moderate to severe pain of the surgical insult and required strong opioid analgesia. Efforts to prolong ISB duration by adding adjuvants to local anesthetic (eg. clonidine, dexmedetomidine) have been studied with promising results. Dexamethasone, has been added to local anesthetic solutions for ISB and has demonstrated promise in preliminary studies. Perineural dexamethasone (8-10mg) in conjunction with local anesthetic prolongs the duration of ISB with an effect sizes ranging from 40% to 75% (absolute effect ~ 6 to 10 hours). Dexamethasone, however, is only approved for intramuscular or intravenous administration and therefore perineural use is currently off-label. Intravenous administration of dexamethasone was reported to have similar effects as perineural route indicating the possible mechanism for prolonging analgesic duration might be due to the systemic effects of dexamethasone. We hypothesized: should that is the reason, systemic administration of dexamethasone at different time may provide similar effects on the duration of peripheral nerve block. Dexamethasone is a slow effect cortisone with long half-time, it is widely used at the beginning of surgery to prevent postoperative nausea and vomiting. A trial that demonstrates enhanced block quality and duration associated with intravenous dexamethasone at different time may allow us to achieve prolonged duration of effect if dexamethasone is used in perioperative period for different purpose. This would further identify the possible mechanism of dexamethasone to prolong the analgesia effect of local anesthetics. ;

Study Design

Related Conditions & MeSH terms

Clinical Trial Details
NCT number NCT04714112
Study type Interventional
Source Shanghai Jiao Tong University Affiliated Sixth People's Hospital
Contact
Status Completed
Phase Phase 4
Start date January 10, 2021
Completion date July 31, 2021
View Details
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