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Latency of the Acoustic Reflex in Eighth-Nerve Tumor

Latency of the Acoustic Reflex in Eighth-Nerve Tumor Abstract • We evaluated acoustic reflex morphologic features in four subjects with confirmed, unilateral acoustic neuroma. All four subjects showed marked reduction in absolute reflex amplitude and alteration in the reflex amplitude-intensity function in the ear with eighth-nerve disorder. The early, fast-rising component of the normal reflex was also typically absent in the ears with tumor. Interaural latency comparisons were made in three ways. At equal reflex sensation levels and equal reflex sound pressure levels, latency was substantially delayed in the ear with the eighth-nerve disorder. At equivalent reflex amplitudes, however, latency was equivalent in normal ears and ears with eighth-nerve disorder. Results suggest that delayed onset of the acoustic reflex in subjects with eighth-nerve disorder may reflect amplitude and wave-form morphologic effects rather than a latency prolongation per se. (Arch Otolaryngol 1983;109:1-5) References 1. Clemis J, Sarno C: The acoustic reflex latency test: Clinical application . Laryngoscope 1980;90:601-611.Crossref 2. Clemis J, Sarno C: Acoustic reflex latency test in the evaluation of nontumor patients with abnormal brainstem latencies . Ann Otol Rhinol Laryngol 1980;89:296-302. 3. Mangham C, Lindeman R, Dawson W: Stapedius reflex quantification in acoustic tumor patients . Laryngoscope 1980;90:242-250. 4. Hung I, Dallos P: Study of the acoustic reflex in human beings: I. Dynamic characteristics . J Acoust Soc Am 1972;52:1168-1180.Crossref 5. Sundby A, Flottorp G, Djupesland G: Time Constants of Registrating Equipment in Middle Ear Impedance Investigation: Proceedings of the Second Nordic Meeting on Medical and Biological Engineering. 1971, pp 207-209. 6. Ruth R, Niswander P: Acoustic reflex latency as a function of frequency and intensity of eliciting stimulus . J Am Aud Soc 1976;2:54-60. 7. McPherson D, Thompson D: Quantification of the threshold and latency parameters of the acoustic reflex in humans . Acta Otolaryngol , 1978, (suppl 353) , pp 1-37. 8. Hayes D: Effect of degree of hearing loss on diagnostic audiometric tests . Am J Otol 1980;2:91-96. 9. Josey A, Jackson C, Glasscock M: Brainstem evoked response audiometry in confirmed eighth nerve tumors . Am J Otolaryngol 1980;1:285-290.Crossref 10. Moller AR: Acoustic reflex in man . J Acoust Soc Am 1962;34:1524-1534.Crossref 11. Borg E: Acoustic middle ear reflexes: A sensory-control system . Acta Otolaryngol , 1972, (suppl 304) , pp 1-34. 12. Jerger J, Hayes D: Diagnostic applications of impedance audiometry: Middle ear disorder, sensori-neural disorder , in Jerger J, Northern J (eds): Clinical Impedance Audiometry , ed 2. Acton, Mass, American Electromedics, 1980, pp 109-127. 13. Jerger S: Diagnostic applications of impedance audiometry: Central auditory disorder , in Jerger J, Northern J (eds): Clinical Impedance Audiometry , ed 2. Acton, Mass, American Electromedics, 1980, pp 128-140. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Archives of Otolaryngology American Medical Association

Latency of the Acoustic Reflex in Eighth-Nerve Tumor

Archives of Otolaryngology , Volume 109 (1) – Jan 1, 1983

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References (11)

Publisher
American Medical Association
Copyright
Copyright © 1983 American Medical Association. All Rights Reserved.
ISSN
0003-9977
DOI
10.1001/archotol.1983.00800150005001
Publisher site
See Article on Publisher Site

Abstract

Abstract • We evaluated acoustic reflex morphologic features in four subjects with confirmed, unilateral acoustic neuroma. All four subjects showed marked reduction in absolute reflex amplitude and alteration in the reflex amplitude-intensity function in the ear with eighth-nerve disorder. The early, fast-rising component of the normal reflex was also typically absent in the ears with tumor. Interaural latency comparisons were made in three ways. At equal reflex sensation levels and equal reflex sound pressure levels, latency was substantially delayed in the ear with the eighth-nerve disorder. At equivalent reflex amplitudes, however, latency was equivalent in normal ears and ears with eighth-nerve disorder. Results suggest that delayed onset of the acoustic reflex in subjects with eighth-nerve disorder may reflect amplitude and wave-form morphologic effects rather than a latency prolongation per se. (Arch Otolaryngol 1983;109:1-5) References 1. Clemis J, Sarno C: The acoustic reflex latency test: Clinical application . Laryngoscope 1980;90:601-611.Crossref 2. Clemis J, Sarno C: Acoustic reflex latency test in the evaluation of nontumor patients with abnormal brainstem latencies . Ann Otol Rhinol Laryngol 1980;89:296-302. 3. Mangham C, Lindeman R, Dawson W: Stapedius reflex quantification in acoustic tumor patients . Laryngoscope 1980;90:242-250. 4. Hung I, Dallos P: Study of the acoustic reflex in human beings: I. Dynamic characteristics . J Acoust Soc Am 1972;52:1168-1180.Crossref 5. Sundby A, Flottorp G, Djupesland G: Time Constants of Registrating Equipment in Middle Ear Impedance Investigation: Proceedings of the Second Nordic Meeting on Medical and Biological Engineering. 1971, pp 207-209. 6. Ruth R, Niswander P: Acoustic reflex latency as a function of frequency and intensity of eliciting stimulus . J Am Aud Soc 1976;2:54-60. 7. McPherson D, Thompson D: Quantification of the threshold and latency parameters of the acoustic reflex in humans . Acta Otolaryngol , 1978, (suppl 353) , pp 1-37. 8. Hayes D: Effect of degree of hearing loss on diagnostic audiometric tests . Am J Otol 1980;2:91-96. 9. Josey A, Jackson C, Glasscock M: Brainstem evoked response audiometry in confirmed eighth nerve tumors . Am J Otolaryngol 1980;1:285-290.Crossref 10. Moller AR: Acoustic reflex in man . J Acoust Soc Am 1962;34:1524-1534.Crossref 11. Borg E: Acoustic middle ear reflexes: A sensory-control system . Acta Otolaryngol , 1972, (suppl 304) , pp 1-34. 12. Jerger J, Hayes D: Diagnostic applications of impedance audiometry: Middle ear disorder, sensori-neural disorder , in Jerger J, Northern J (eds): Clinical Impedance Audiometry , ed 2. Acton, Mass, American Electromedics, 1980, pp 109-127. 13. Jerger S: Diagnostic applications of impedance audiometry: Central auditory disorder , in Jerger J, Northern J (eds): Clinical Impedance Audiometry , ed 2. Acton, Mass, American Electromedics, 1980, pp 128-140.

Journal

Archives of OtolaryngologyAmerican Medical Association

Published: Jan 1, 1983

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