Thermal Vestibulometry after Head Injury
Journal Title: Nepal Journal of Neuroscience - Year 2010, Vol 7, Issue 1
Abstract
The main purpose of this study is to determine the site of lesion in head injury cases by a procedure called thermal vestibulometry. Thermal vestibulometry was done in eleven normal subjects and ten patients of head injury. MSPV (maximum slow phase velocity) was calculated and plotted in a curve where ordinate was represented by MSPV and abscissa by different caloric temperatures. Resulting curve was studied by comparing the vestibulogram of individual head injury group with the maximum and minimum values of the control group of patients in order to arrive at a diagnosis. Out of ten cases of head injury, five patients showed hypofunctioning vestibulograms, two patients showed recruitment, two patients showed hyperactivity with or without decruitment and three cases showed normal vestibulograms. Nature of hearing loss of every deaf patient was compared with the vestibulogram of that individual case to know whether the auditory and the vestibular lesions of an individual were same or not. Hypofunction was a sign of a peripheral vestibular lesion. Presence of recruitment was diagnosed as a peripheral phenomenon. Hyperactivity with values of MSPV above the normal reference value was termed as a central phenomenon. The phenomenon of decay or decruitment which is always taken as a central phenomenon in audiometry, was found to be either peripheral or central in thermal vestibulometry. When compared with the site of origin of a deaf patient, it was found that the site of vestibular lesion may not be the same as that of the auditory lesion
Authors and Affiliations
Akhil Chandra Sarma, MS
Keywords
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