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Abstract
Two parts of the labyrinth sense inertial forces arising from head movements as well as forces due to gravity, the semicircular canals are primarily concerned with rotational accelerations while the otolith organs, the utricle and saccule, transducer linear acceleration and are sensitive to static head position.
Inputs are crucial for dynamic and static control of oculomotor responses to linear motion of the head, especially in the vertical pitch and roll planes. Otolith play role in the perception of verticality.
Over the last years, vestibular function tests concentrate on the horizontal semi-circular canal ocular reflex as it is the easiest reflex to stimulate and record.
New horizon was introduced in vestibular function tests to highlight the contribution and the effect of otolith organ on balance.
Twenty healthy adult volunteers with no history of vestibular symptoms served for standardization of the SVVT and sixty Nine subjects with diagnosis of vestibular otolith disorders. They were 34 males and 35 females, their age ranged from 42 to 60 years (45.4±1.29 years) with duration of illness ranged from 15.1 to 19.5 months with mean of 17.3±1.1 which ensure that the time for spontaneous recovery had elapsed
They were submitted to full audiological and vestibular assessment so as to diagnose otolith affection (using DHI, ENG/VNG, CDP, VEMPs and/or SVVT) with/or without SCC affection. Only 55 patients received three forms of VRT (as the rest had Meniere’s disease and were excluded from VRT due to the fluctuating nature of the disease).VRT was received on a regular bases either clinic based (OPK and OPK in the roll plane) or home-based (VORx1 &x2), 2 sessions/week for 6 weeks. All the study group was re-evaluated after the completion of the program using DHI (subjectively) and CDP, VEMPs and SVVT (objectively).There was statistical significant difference between before and after rehabilitation as regards DHI scores and SOT-CDP in conditions 5,6 &CS which magnifies the importance of VRT in long standing dizziness. However, VEMPs recovered in 2 patients only who emphasize the fact that VEMPs is a good tool in diagnosing saccular pathology but a rather insensitive tool in monitoring VRT.