Abstract
A new tubal transducer (NC-3) for measuring cochlear microphonics (CM) in extratympanic electrocochleography (ECochG) was developed by improving the common hearing aid earphone. Using a human forearm as a dummy ear, the artifact contamination generated from the NC-3 tubal transducer was tested and the possibility of measuring the CM at a non-shielded bedside was studied. An HN-5 electrode was fixed to a subject's forearm, and a sound stimulus of 90 dBnHL was delivered through the tube of the NC-3. When the earphone of the transducer was placed at a right-angle to the electrode on either a vertical or horizontal plane and the electrode was placed in direct contact with the tip of the tube, contamination from electromagnetic induction and CM-like mechanical vibration were prevented. Using the HN-5 electrode and NC-3, extratympanic ECochG-CM was recorded from normal-hearing subjects in both a shielded sound-proof room and a non-shielded ordinary, quiet room. No differences were found between CMs measured in the two rooms. These results suggest that the NC-3 overcomes the shortcomings of a loudspeaker system and allows CM to be recorded accurately at non-shielded bedsides.
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References
Chan L, Xluwu C, Li X (1992) Cochlear microhponics and recruitment. Acta Otolaryngol (Stockh) 112: 213–220
Eggermont JJ, Odenthal DW, Schmidt PH, Spoor A (1974) Electrocochleography. Basic principles and clinical application. Acta Otolaryngol (Stockh) [Suppl] 316: 17–24
Elbering C (1977) Some aspects of electrocochleography (ECoG). Fadl, Copenhagen, pp 489–495
Gibson WPR (1978) Essentials of clinical electric response audiometry. Churchill Livingstone, Edinburgh, pp 59–106
Hoke M (1976) Cochlear microphonics in man and its probable importance in objective audiometry. In: Ruben RJ, Elbering C, Salomon G (eds) Electrocochleography. University Park Press, Baltimore, pp 41–54
Nishida H (1981) Clinical application of electrocochleography. Pract Otol (Kyoto) 74: 134–138
Nishida H, Okada M, Tanaka Y (1993) Delayed responses in ECoG. In: Höhman D (ed) ECoG, OAE and introaperative monitoring. Kugler, Amsterdam, pp 41–44
Nishida H, Tanaka Y, Okada M, Inoue Y (1995) Evoked otoacoustic emission and electrocochleography in a patient with multiple sclerosis. Ann Otol Rhinol Laryngol 104: 456–462
Nishida N, Noguchi Y, Komatsuzaki A (1996) A new electrode (HN-5) for CM measurement in extratympanic electrocochleography. Audiology 35: 98
Sakamaoto T, Sugano T (1963) Electrical theory 1. Jikkyo, Tokyo
Yagasaki A, Hirata M (1989) Noise countermeasure in the field (technology for effective investigation/countermeasure upon the occurrence of trouble according to example) (in Japanese). EMC Japan `89 Symposium, Practice of Countermeasure III. Japan Management Association, Tokyo, pp 8˙2˙1-8˙2˙27
Zerlin S, Naunton RF (1978) Recording and analysis techniques. In: Naunton RF, Fernandez C (eds) Evoked electrical activity in the auditory nervous system. Academic Press, New York, pp 195–208
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Nishida, H., Komatsuzaki, A. & Noguchi, Y. Cochlear microphonics recordable at the non-shielded bedside using a new tubal transducer. Eur Arch Otorhinolaryngol 254 (Suppl 1), S46–S49 (1997). https://doi.org/10.1007/BF02439721
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DOI: https://doi.org/10.1007/BF02439721