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Otorinolaringologia 1998 September;48(3):107-11

Copyright © 2000 EDIZIONI MINERVA MEDICA

language: English

Diagnostic significance of the acoustic reflex test in cerebellopontine angle tumors

Singh S., Mann S. B. S., Gupta A. K., Khosla V. K.*, Raghunathan M. R., Hundal J. S.

From the Department of Otolaryngology Head and Neck Surgery and * Department of Neurosurgery Postgraduate Institute of Medical Education & Research, Chandigarh, India


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Back­ground. The aim of the ­present ­study was to eval­u­ate the effec­tive­ness of the acous­tic ­reflex ­test in diag­nos­ing cer­e­bel­lo­pon­tine ­angle ­tumors espe­cial­ly acous­tic neu­ro­ma.
Meth­ods. A pros­pec­tive ­study of fif­teen neu­ro­ra­dio­log­i­cal­ly prov­en cas­es of cer­e­bel­lo­pon­tine ­angle ­tumors, who under­went radio­log­i­cal exam­ina­tion includ­ing Acous­tic ­Reflex ­Test (ART) was under­tak­en to ­study the diag­nos­tic sig­nif­i­cance of ART and to ­find a cor­re­la­tion, if any ­between ART and ­tumor ­size. The ­study was con­duct­ed at the Post­grad­u­ate Insti­tute of Med­i­cal Edu­ca­tion & ­Research, Chan­di­garh, ­India. The low­est lev­el of stim­u­la­tion result­ing in ­change in impe­dance was con­sid­ered as acous­tic ­reflex thresh­old.
­Results. On the ­basis of the ­three param­e­ters: ­absence of acous­tic ­reflex, ele­va­tion of ­reflex thresh­old or pres­ence of acous­tic ­reflex ­decay, we ­were ­able to diag­nose 14 of the 15 cer­e­bel­lo­pon­tine ­angle ­patients. Of ­these ele­vat­ed thresh­old ­with pos­i­tive ­decay was ­seen in 40% ­patients, ­reflex ­present ­with no ­decay in 6.6% ­patients, ­reflex ­absent at all fre­quen­cies in 46.7% ­patients and nor­mal ­reflex was ­observed in 6.6% ­patients.
Con­clu­sions. The detec­tion of cer­e­bel­lo­pon­tine ­angle ­tumors is of great­est impor­tance and ART pro­vides a sim­ple, yet sen­si­tive diag­nos­tic ­tool for eval­u­at­ing ­patients ­with sus­pect­ed ­Eighth ­Nerve dis­or­der.

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