Department of Breast and Endocrine Surgery, Haukeland University Hospital, Bergen, Norway.
Department of Clinical Sciences, University of Bergen, Bergen, Norway.
Laryngoscope. 2024 Mar;134(3):1485-1491. doi: 10.1002/lary.31020. Epub 2023 Sep 2.
Vocal cord (VC) movement has been demonstrated by the use of accelerometry (ACC) to decrease in parallel with the electromyographic amplitude (EMG) during ongoing traction injury to the recurrent laryngeal nerve (RLN). When RLN function recovers, discrepancies between EMG and VC movement have been reported in clinical and experimental studies. The present study was conducted to clarify the actual relationship between EMG and VC movement measured by ACC during nerve recovery.
EMG obtained by continuous nerve monitoring (C-IONM) was compared with ACC during traction injury to the RLN, and throughout 40-min nerve recovery. A three-axis linear accelerometer probe was attached to the VC, and ACC data were registered as described. Traction damage was applied to the RLN until there was a 70% amplitude decrease from baseline EMG, or until loss of signal (LOS), that is, EMG values ≤100 μV.
Thirty-two RLN from 16 immature pigs were studied. Correlation between EMG and ACC were calculated during nerve injury and nerve recovery. The mean correlations were for the 70% and LOS group from start to end of traction: 0.82 (±0.17) and 0.87 (±0.17), respectively. Corresponding correlation coefficients during 40-min recovery was 0.50 (±0.48) in the 70% group and 0.53 (±0.33) in the LOS group.
There is a high correlation between EMG and VC movement during nerve injury, and a moderate correlation during early nerve recovery. EMG recovery after RLN injury ensures sufficient VC function as assessed by ACC.
N/A Laryngoscope, 134:1485-1491, 2024.
在对喉返神经（RLN）进行持续牵引损伤时，肌电图（EMG）幅度与声带（VC）运动呈平行下降，通过加速度计（ACC）已证明 VC 运动减少。当 RLN 功能恢复时，在临床和实验研究中已经报道了 EMG 和 VC 运动之间存在差异。本研究旨在阐明在神经恢复过程中通过 ACC 测量的 EMG 和 VC 运动之间的实际关系。
在 RLN 牵引损伤期间和整个 40 分钟神经恢复期间，将连续神经监测（C-IONM）获得的 EMG 与 ACC 进行比较。将三轴线性加速度计探头连接到 VC 上，并按照所述方法记录 ACC 数据。对 RLN 施加牵引损伤，直到 EMG 幅度从基线下降 70%，或直到信号丢失（LOS），即 EMG 值≤100μV。
研究了 16 只未成熟猪的 32 条 RLN。在神经损伤和神经恢复期间计算了 EMG 和 ACC 之间的相关性。从牵引开始到结束时，70%和 LOS 组的平均相关性分别为 0.82（±0.17）和 0.87（±0.17）。在 40 分钟恢复期间，70%组的相关系数为 0.50（±0.48），LOS 组为 0.53（±0.33）。
在神经损伤期间，EMG 和 VC 运动之间存在高度相关性，在早期神经恢复期间存在中度相关性。RLN 损伤后 EMG 恢复可确保 ACC 评估的 VC 功能充足。
无 喉科学，134：1485-1491，2024。
