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Facial nerve conduction study in the prognosis of Bell’s palsy outcomes by using Facial Nerve Grading System 2.0

To evaluate the prognosis value of facial nerve conduction study in Bell’s palsy outcome. Subjects and methods: A descriptive and cross-sectional study using electro diagnostic data and medical chart review on 29 patients diagnosed with Bell’s palsy in Department of Neurology, Military Hospital 103 from January 2017 to December 2017, were evaluated using the facial nerve grading system 2.0 (FNGS) during their initial visit and on day 20 and day 40. We performed facial nerve conduction studies (NCS) in the first 5 days and on the 20th day. Facial NCS results were classified into amplitude loss less than 75% and amplitude loss 75% or greater to stratify into good or poor prognosis. Results: In the first 5 days, the amplitude loss was less than 75% in 13 patients (44.8%) and 75% or greater in 16 patients (55.2%). On the 20th day, the amplitude loss was less than 75% in 8 patients (27.6%) and 75% or greater in 21 patients (72.4%). There was a statistically significant correlation between patients with compound muscle action potential (CMAP) amplitude difference 75% or higher in the first 5 days and those with FNGS 2.0 equal to grade 3 or above (Chi Square = 9.311, p = 0.004). | Facial nerve conduction study in the prognosis of Bell’s palsy outcomes by using Facial Nerve Grading System 2.0 Journal of military pharmaco-medicine no5-2018 FACIAL NERVE CONDUCTION STUDY IN THE PROGNOSIS OF BELL’S PALSY OUTCOME BY USING FNGS 2.0 Le Trung Duc*; Nguyen Duc Thuan*; Nguyen Tien Son* SUMMARY Objectives: To evaluate the prognosis value of facial nerve conduction study in Bell’s palsy outcome. Subjects and methods: A descriptive and cross-sectional study using electro diagnostic data and medical chart review on 29 patients diagnosed with Bell’s palsy in Department of Neurology, Military Hospital 103 from January 2017 to December 2017, were evaluated using the facial nerve grading system 2.0 (FNGS) during their initial visit and on day 20 and day 40. We performed facial nerve conduction studies (NCS) in the first 5 days and on th the 20 day. Facial NCS results were classified into amplitude loss less than 75% and amplitude loss 75% or greater to stratify into good or poor prognosis. Results: In the first 5 days, the amplitude loss was less than 75% in 13 patients (44.8%) and 75% or greater in 16 patients th (55.2%). On the 20 day, the amplitude loss was less than 75% in 8 patients (27.6%) and 75% or greater in 21 patients (72.4%). There was a statistically significant correlation between patients with compound muscle action potential (CMAP) amplitude difference 75% or higher in the first 5 days and those with FNGS 2.0 equal to grade 3 or above (Chi Square = 9.311, p = 0.004). There was a statistically significant correlation between patients with CMAP amplitude th difference 75% or higher on 20 day and those with FNGS 2.0 equal to grade 3 or above (Chi square = 19.859, p < 0.001). Conclusion: The facial nerve conduction study is a valuable tool for follow-up and recovery prognosis of the Bell’palsy, especially in the subacute phase. Based on our data, poor prognosis is predicted in patients with more .