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Titolo:
SHORT-TERM EFFECTIVENESS OF MEDIAL EFFERENTS DOES NOT PREDICT SUSCEPTIBILITY TO TEMPORARY THRESHOLD SHIFT IN THE GUINEA-PIG
Autore:
ZENNARO O; ERRE JP; ARAN JM; DAUMAN R;
Indirizzi:
UNIV HOSP PELLEGRIN,DEPT AUDIOL F-33076 BORDEAUX FRANCE UNIV VICTOR SEGALEN BORDEAUX 2,UPR ES,INSERM CJF9704 BORDEAUX FRANCE
Titolo Testata:
Acta oto-laryngologica
fascicolo: 5, volume: 118, anno: 1998,
pagine: 681 - 684
SICI:
0001-6489(1998)118:5<681:SEOMED>2.0.ZU;2-1
Fonte:
ISI
Lingua:
ENG
Soggetto:
ACOUSTIC DISTORTION PRODUCTS; STIMULATION; HUMANS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
11
Recensione:
Indirizzi per estratti:
Citazione:
O. Zennaro et al., "SHORT-TERM EFFECTIVENESS OF MEDIAL EFFERENTS DOES NOT PREDICT SUSCEPTIBILITY TO TEMPORARY THRESHOLD SHIFT IN THE GUINEA-PIG", Acta oto-laryngologica, 118(5), 1998, pp. 681-684

Abstract

The 2f(1) - f(2) distorsion product (DPOAE) was measured in conjunction with contralateral noise to evaluate the short-term effectiveness of the olivocochlear efferents in guinea pigs (GPs). An attenuation effect was observed predominantly between 1 and 6 kHz when primary tones were set at 65 dB SPL (contralateral noise of 55 dB SPL). Subsequently, GPs were exposed to a 2 kHz tone of 87 dB SPL for 40 min, using DPOAEs as an estimate of cochlear sensitivity. The response of the cochleaappeared variable. In order to investigate whether effectiveness of efferents plays a role in temporary threshold shift (TTS), the responses of the cochlea to overstimulation were classified into three groups:ij clear cochlear change with complete recovery or actual TTS (group A(1)); ii) clear cochlear change with incomplete recovery (group A(2)); iii) mild or no change in cochlear function (group B). No relationship was found between the attenuation effect measured before noise overexposure and the susceptibility to TTS. Animals with a significant attenuation effect could fit into any of the three groups. In addition, the recovery from loud sound exposure was not paralleled with the changes occurring over time in the attenuation effect. Therefore, the conclusion that short-term effectiveness of medial efferents does not predict susceptibility to TTS in the GP is suggested.

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Documento generato il 04/12/20 alle ore 19:23:53