Clinically useful adjuvants in regional anaesthesia

Area of Science:

• Anesthesiology
• Pharmacology
• Pain Management

Background:

• Regional anesthesia is crucial for surgical pain management.
• Adjuvant drugs can enhance the efficacy and duration of local anesthetics.
• Optimizing adjuvant use is key to improving patient outcomes and reducing opioid consumption.

Purpose of the Study:

• To review the clinical use and efficacy of adjuvant drugs in regional anesthesia.
• To highlight the roles of adrenaline, clonidine, ketamine, neostigmine, and NSAIDs.
• To consider future developments in slow-release local anesthetic formulations.

Main Methods:

• Literature review focusing on clinically used adjuvant drugs.
• Analysis of studies investigating adrenaline, clonidine, ketamine, neostigmine, and NSAIDs.
• Consideration of experimental data on novel drug delivery systems.

Main Results:

• Adrenaline acts as a vasoconstrictor and provides analgesia via alpha2-adrenergic mechanisms, potentially enhancing local anesthetic uptake.
• Clonidine demonstrates synergism with local anesthetics and spinal opioids, though associated with bradycardia and hypotension.
• Neostigmine offers antinociception but can cause frequent gastrointestinal side effects; biodegradable microcapsules show promise for prolonged analgesia but with local reactions.

Conclusions:

• Adrenaline and opioids are well-established, important adjuvants in regional anesthesia.
• Clonidine and neostigmine can extend analgesia but their use is limited by side effects.
• Further research into long-acting analgesic formulations is essential for advancing regional anesthesia techniques.