title: Auditory- and Vestibular-Evoked Potentials Correlate with Motor and Non-Motor Features of Parkinson's Disease.
abstract: Degeneration of several brainstem nuclei has been long related to motor and non-motor symptoms (NMSs) of Parkinson's disease (PD). Nevertheless, due to technical issues, there are only a few studies that correlate that association. Brainstem auditory-evoked potential (BAEP) and vestibular-evoked myogenic potential (VEMP) responses represent a valuable tool for brainstem assessment. Here, we investigated the abnormalities of BAEPs, ocular VEMPs (oVEMPs), and cervical VEMPs (cVEMPs) in patients with PD and its correlation to the motor and NMSs. Fifteen patients diagnosed as idiopathic PD were evaluated by Unified Parkinson's Disease Rating Scale and its subscores, Hoehn and Yahr scale, Schwab and England scale, and Non-Motor Symptoms Scale. PD patients underwent pure-tone, speech audiometry, tympanometry, BAEP, oVEMPs, and cVEMPs, and compared to 15 age-matched control subjects. PD subjects showed abnormal BAEP wave morphology, prolonged absolute latencies of wave V and I-V interpeak latencies. Absent responses were the marked abnormality seen in oVEMP. Prolonged latencies with reduced amplitudes were seen in cVEMP responses. Rigidity and bradykinesia were correlated to the BAEP and cVEMP responses contralateral to the clinically more affected side. Contralateral and ipsilateral cVEMPs were significantly correlated to sleep (p= 0.03 and 0.001), perception (p= 0.03), memory/cognition (p= 0.025), and urinary scores (p= 0.03). The oVEMP responses showed significant correlations to cardiovascular (p= 0.01) and sexual dysfunctions (p= 0.013). PD is associated with BAEP and VEMP abnormalities that are correlated to the motor and some non-motor clinical characteristics. These abnormalities could be considered as potential electrophysiological biomarkers for brainstem dysfunction and its associated motor and non-motor features.
authors.affiliation: Department of Neurology, Ain Shams University , Cairo , Egypt.
authors.forename: Ali Soliman
authors.initials: AS
authors.lastname: Shalash
authors.affiliation: Audiology Unit, Department of Otorhinolaryngology, Ain Shams University , Cairo , Egypt.
authors.forename: Dalia Mohamed
authors.initials: DM
authors.lastname: Hassan
authors.affiliation: Institute of Psychiatry, Ain Shams University , Cairo , Egypt.
authors.forename: Hanan Hani
authors.initials: HH
authors.lastname: Elrassas
authors.affiliation: Department of Toxicology, Mansoura University , Mansoura , Egypt.
authors.forename: Mohamed Mosaad
authors.initials: MM
authors.lastname: Salama
authors.affiliation: Instituto de Investigación Científica, Universidad Juárez del Estado de Durango , Durango , Mexico.
authors.forename: Edna
authors.initials: E
authors.lastname: Méndez-Hernández
authors.affiliation: Instituto de Investigación Científica, Universidad Juárez del Estado de Durango , Durango , Mexico.
authors.forename: José M
authors.initials: JM
authors.lastname: Salas-Pacheco
authors.affiliation: Unidad de Trastornos del Movimiento y Sueño, Hospital General Dr. Manuel Gea González , Ciudad de México , Mexico.
authors.forename: Oscar
authors.initials: O
authors.lastname: Arias-Carrión
keywords: Parkinson’s disease; auditory; evoked potentials; motor; non-motor; vestibular