Ropivacaine and magnesium sulfate in sciatic nerve block at the popliteal level: randomized double-blind study

Area of Science:

• Anesthesiology
• Pain Management
• Pharmacology

Background:

• Postoperative acute pain affects over 80% of patients, with significant dissatisfaction regarding pain relief.
• Multimodal analgesia, incorporating adjuvants with local anesthetics, is a key strategy in modern pain management.
• Ropivacaine is a commonly used long-acting local anesthetic for surgical procedures.

Purpose of the Study:

• To evaluate the analgesic efficacy of magnesium sulfate as an adjuvant to ropivacaine in sciatic nerve blocks.
• To assess the impact of magnesium sulfate on sensory block characteristics and postoperative pain following bunion correction surgery.

Main Methods:

• A double-blind, randomized study involving 50 patients undergoing bunion correction surgery.
• Patients received either ropivacaine with magnesium sulfate (MgSO4) or ropivacaine with a physiological solution via sciatic nerve block.
• The primary endpoint was the duration of the sensory block.

Main Results:

• Magnesium sulfate significantly reduced sensory block onset time (9.2 vs. 21.8 minutes) and prolonged its duration (18.2 vs. 13.9 hours).
• Postoperative pain scores (NRS) were significantly lower in the magnesium group between 12 and 24 hours (2 vs. 6.7).
• The need for additional opioids was significantly reduced in patients who received magnesium sulfate.

Conclusions:

• Magnesium sulfate added to ropivacaine for sciatic nerve blocks enhances analgesia by extending block duration and reducing pain.
• This combination therapy improves the quality of pain relief and decreases the requirement for postoperative opioids.
• Further research is warranted to validate these findings and explore broader clinical applications.