Wide Awake Local Anesthesia No Tourniquet (WALANT) technique improves the efficiency of distal nerve blocks for carpal tunnel release

Abstract

BackgroundAxillary block is the standard for carpal tunnel release (CTR), providing effective anesthesia, and tolerance of tourniquet. Conversely, distal blocks are less used due to poor tolerance of tourniquet. Wide Awake Local Anesthesia No Tourniquet (WALANT), proposed for hand and wrist surgeries, avoids its use. This study assesses the benefits of the addition of WALANT to distal blocks during endoscopic CTR (eCTR). MethodsThis randomized, open-label, controlled trial prospectively enrolled 60 patients scheduled for eCTR. Patients were randomized to receive distal blocks at the wrist combined to either a high arm tourniquet (Distal block group) or a WALANT in the area of surgery (Distal + Walant group). The primary endpoint was the global pain score summing pain scores related to puncture, local anesthetic injection, pneumatic tourniquet, surgical procedure, tourniquet deflation, and residual sensitivity after surgery. ResultsMean global pain score was significantly reduced in the Distal + Walant group (0.5 ± 1.4 vs. 2.2 ± 2.4; p < 0.001). No need for an additional anesthetic procedure was required in the Distal + Walant group. Even if the quality of visualization was high in both groups, it was better in the Distal block group (5 [5–5] vs. 4 [4–5]; p < 0.001). No rescue tourniquet was necessary for the Distal + Walant group. The rate of hematoma 15 days post-surgery was significantly reduced in the Distal + Walant group (20% vs. 57%; p < 0.01). ConclusionsThe addition of WALANT to distal blocks is adapted for eCTR. This combined technique decreases perioperative pain scores, provides good surgery conditions, and reduces the risk of postoperative hematoma. Clinical trial number and registry URLThe trial was registered on ClinicalTrials.gov (NCT04494100) on July 31, 2020 https://clinicaltrials.gov/ct2/show/NCT04494100?term=CMC+ambroise+pare&cntry=FR&draw=4&rank=28.