Subjective visual verticalin posterior canal benign paroxysmal positional vertigo patients beforeand after canalith repositioning maneuvers / Lamiaa Ahmed Eldessokey Madkour ; Supervised Mohamed Sherif Elminawi , Abeir Osman Dabbous , Mariam Magdy Medhat

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

Background: The Subjective visual vertical(SVV)is a measure of otolith-mediated verticality perception. The aimof this study was to test otolith function using the SVV in patients with posterior canal (PC) Benign Paroxysmal Positional Vertigo (BPPV) before and after Epley's canalith repositioning maneuver (CRM). Methodology:This study included 20 PC BPPV patients and 20 healthy control subjects.SVV was tested using special equipment, at the time of BPPV diagnosis, then after CRM, and then 1 week after the resolution of the vertigo and nystagmus. SVV was determined from clockwise (CW) and counter-clockwise (CCW) directions. The absolute average and the conventional numerical average was calculated. Results:Using the conventional method, there was no statistically significant difference between BPPV and their controls regarding either the CW or the CCW-SVV or the average slope.There was no statistically significant difference between CW and CCW-SVV in the patients. There was no statistically significant difference in the mean SVVvalues or the distribution of normal and abnormal results or the distribution of the SVV tilt between both sided BPPV. Using the absolute average, SVV tilt was significantly higher in the patients than the controls. The preset angle affected the result. The meanSVV was significantly lower after resolution of BPPV than before treatment

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