Related Experiment Video
Updated: Aug 29, 2026

Metacarpal Small Incision for Carpal Tunnel Syndrome
Published on: April 5, 2024
Randomized trial of buffered versus plain lidocaine for local anaesthesia in open carpal tunnel decompression
Abstract:
We performed a randomized double-blind case-control study in 64 consecutive patients undergoing open carpal tunnel decompression under local anaesthetic to assess the pain experienced on injection of plain lidocaine (pH 6.4) compared with lidocaine buffered with sodium bicarbonate (pH 7.4). The results showed no statistical difference in the pain scores reported by patients. The mean pain scores for all patients were low, and most patients reported that they were "not at all anxious" about receiving a similar injection in the future.
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