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A Journal on Otorhinolaryngology, Head and Neck Surgery,
Plastic Reconstructive Surgery, Otoneurosurgery
Indexed/Abstracted in: EMBASE, Scopus
Otorinolaringologia 1998 September;48(3):107-11
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
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.