Screening for Prognostic Biomarkers of Severe Bell's Palsy in Adults

Overview

Bell's palsy (idiopathic peripheral facial palsy) is the most common cause of facial palsy, which is related to the inflammation of the facial nerve, possibly induced by herpesvirus reactivation. Its first-line treatment comprises corticosteroids, antiviral therapy and physiotherapy. In most severe cases (grade IV to VI on House-Brackmann scale), facial motricity may remain altered or develop synkinesis or post-paralytic spasm, thus tremendously affecting quality of life. To avoid potential complications, surgical facial nerve decompression could be proposed. To date, however, there are no means to predict if Bell's palsy will evolve with any complications or if the patient will recover entirely. Thus, the invasive facial nerve decompression is equally proposed to subjects who will develop the consequences as well as to subjects able to restore without surgical treatment. This study proposes to search for prognostic blood biomarkers related to the Bell's palsy recovery pattern. Adult patients with severe Bell's palsy will be proposed to have a blood sampling for proteomic analysis in the early stage of the disease. Then 125 biomarkers on a Peptiquant™ kit will be analysed by mass spectrometry, and prognostic biomarkers will be selected regarding to the clinical recovery of Bell's palsy

Bell's palsy (idiopathic peripheral facial palsy) is the most common cause of facial palsy, which is related to the inflammation of the facial nerve, possibly induced by herpesvirus reactivation. Its first-line treatment comprises corticosteroids, antiviral therapy and physiotherapy. In most severe cases (grade IV to VI on House-Brackmann scale), facial motricity may remain altered or develop synkinesis or post-paralytic spasm, thus tremendously affecting quality of life. The recovery of Bell's palsy is currently evaluated either by Sunnybrook Facial Grading System, House-Brackmann scale or Chevalier's method. It is nonetheless unpredictable, especially at the early stage of the disease. If the first-line treatment fails to provide a fast recovery, facial nerve decompression surgery may be proposed. Being rather complex and risky, this technique shows a lower efficiency if delayed from the onset. Surgical indication is based upon clinical and radiological criteria as well as electrophysiological measurements (electromyography - EMG and electromyoneurography - EMNG). EMG and ENMG methods have a somewhat limited predictive value, since 20 to 40% patients with severe Bell's palsy can recover without surgical treatment. Moreover, these measurements are not widely accessible and, in severe cases, they should be performed between 9 and 20 days from the onset. The surgery, in order to increase its success rate, should be performed in maximum 30 days, ideally in 14 days from the onset. Therefore, diagnostic and treatment of severe Bell's palsy face a double challenge: a narrow time window to provide a diagnostic and therapeutic strategy, and the need of a reliable prognostic methods to exclude the possibility of spontaneous recovery and thus to justify the surgical approach. Mass Spectrometry assay allows simultaneous detection of numerous proteins, to screen for inflammatory and neurodegenerative biomarkers at acute stage of Bell's palsy. Some of these proteins might appear of a prognostic value and will help to develop more reliable and personalised treatment approach of severe Bell's palsy. The primary objective of the study is to identify prognostic blood biomarkers related to the facial motricity recovery at 3 months from onset of severe Bell's palsy in adults. The secondary objectives are identification of the biomarkers related to the recovery speed in the first three months, and to the initial severity of Bell's palsy; evaluation of diagnostic performance of selected biomarkers; creation of a blood collection for further research on selected biomarkers. 130 patients referred by accident and emergency department will be enrolled during their appointments at the ENT Department of the University Hospital of Montpellier. BIOFIPS study implies 4 visits, with the overall duration of 3 months per patient. After patient information and consent, routine clinical examination, audiometric testing, tympanometry, acoustic reflex testing and Bell's palsy scoring will be performed. Patients will receive a medical prescription for a blood test an MRI to exclude other causes of facial palsy. At time of inclusion and 1 month after, they will be proposed to have a blood sampling for proteomic analysis. Then 125 biomarkers on a Peptiquant™ kit will be analysed by mass spectrometry, and prognostic biomarkers will be selected regarding to the clinical recovery of Bell's palsy.