Evaluation of the utricular function using ocular vestibular evoked myogenic potential in posterior canal benign paroxysmal positional vertigo patients before and after canalith repositioning maneuver / Mona Tarek Mohammed Kandil ; Supervised Abeir Osman Dabbous , Amira Elshennawy , Mariam Magdy Medhat

Thesis (M.Sc.) - Cairo University - Faculty of Medicine - Department of E.N.T

Background : In Benign paroxysmal positional vertigo (BPPV), the otoconia are dislodged from their usual position within the utricle and migrate into one of the semicircular canals. Utricular dysfunction in BPPV has been reported. Residual dizziness (RD) is common following treatment.Objective: To assess the utricular function in patients with posterior canal BPPV following canalith repositioning maneuver (CRM) using ocular vestibular evoked myogenic potential (oVEMP) and to correlate the findings with any RD after CRM.Methods: 30 adult patients with posterior canal BPPV (6 males and 24 females) were compared to well-matched controls. oVEMP and Dizziness Handicap Inventory (DHI) Questionnaire were administrated before and after successful CRM. Results: Before CRM, the affected ear showed a significant delay in latency of N1 in the affected ear oVEMP and a significantly decreased in N1-P1amplitude compared to controls and to the non-affected ears. After CRM their amplitudes were comparable. The cases had a greater Interaural amplitude difference ratio (IAAD) compared to controls before and after CRM. The non-affected ear showed only decreased in N1-P1amplitude compared to controls. After CRM the affected ear amplitude increased and became comparable to the controls. The IAAD was larger in RD group than non-RD group before and after CRM. The Dizziness handicap severity decreased following CRM. But the occurrence of RD could not be predicted from DHI scores

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