Cui Han, Zhong Weizheng, Zhu Mingxing, Jiang Naifu, Huang Xingxian, Lan Kai, Hu Liyu, Chen Shixiong, Yang Zhuoxin, Yu Haibo, Li Guanglin
Annu Int Conf IEEE Eng Med Biol Soc. 2020 Jul;2020:3662-3665. doi: 10.1109/EMBC44109.2020.9175316.
Bell's palsy impairs the symmetry of facial appearance and movement. Detailed examination of facial muscle activities should be important for the diagnosis and treatment of the Bell's palsy. In this study, facial muscle activities in normal and Bell's palsy conditions were measured using a high-density (HD) electromyography (EMG) technique. The EMG signals during active tasks (four different facial expressions) and resting task were collected with a HD array of EMG electrodes from forehead and cheek muscles. To visualize facial EMG activities, the EMG maps were reconstructed from the HD-EMG recordings. The two-dimension (2D) correlation coefficients between right and left sides of facial EMG maps were calculated to evaluate the symmetry of facial muscle activities during these tasks. Our experimental results showed that the 2D correlation coefficients during active tasks were different significantly (P<0.01) between the healthy group(n=4) and Bell's palsy group(n=3). These results demonstrated that the synchronism of facial muscle activities during active tasks in healthy subjects is greater than that in the Bell's palsy subjects. This pilot study suggested that HD-EMG would be a potential technique to assess abnormal asymmetric activities of facial muscles for Bell's palsy.
贝尔面瘫会损害面部外观和运动的对称性。对面部肌肉活动进行详细检查对于贝尔面瘫的诊断和治疗至关重要。在本研究中，使用高密度（HD）肌电图（EMG）技术测量正常和贝尔面瘫情况下的面部肌肉活动。在主动任务（四种不同面部表情）和静息任务期间，通过HD肌电电极阵列从前额和脸颊肌肉收集肌电信号。为了可视化面部肌电活动，从HD-EMG记录中重建肌电图。计算面部肌电图左右两侧的二维（2D）相关系数，以评估这些任务期间面部肌肉活动的对称性。我们的实验结果表明，健康组（n = 4）和贝尔面瘫组（n = 3）在主动任务期间的二维相关系数存在显著差异（P < 0.01）。这些结果表明，健康受试者在主动任务期间面部肌肉活动的同步性大于贝尔面瘫受试者。这项初步研究表明，HD-EMG将是一种评估贝尔面瘫面部肌肉异常不对称活动的潜在技术。
