Electrocochleography and Symptoms of Inner Ear Dysfunction

Ferraro, John A.; Arenberg, I. Kaufman; Hassanein, Ruth S.

doi:10.1001/archotol.1985.00800040035001

Cited by 83 publications

(51 citation statements)

References 6 publications

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“…In endolymphatic hydrops, a relative increase in endolymphatic fluid pressure causes hydromechanical changes within the scala media and subsequent displacement of the basilar membrane toward the scala tympani. SP elevation is known to reflect these changes Durrant and Gans, 1975;Ferraro et al, 1985). In addition, perilymph fistula is also thought to have the same mechanism as secondary endolymphatic hydrops, and exhibits endolymphatic hydrops histologically and increased SP/AP in animal models (Campbell and Savage, 1992) and in man (Arenberg et al, 1988).…”

Section: Discussionmentioning

confidence: 99%

Electrocochleographic findings in superior canal dehiscence syndrome

et al. 2015

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Section: Discussionmentioning

confidence: 99%

Electrocochleographic findings in superior canal dehiscence syndrome

et al. 2015

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“…2 years. As to a correlation between hearing and an elevation in the SP/AP ratio, a positive ECoG was reported to be strongly related to the degree of deafness [5,18,19] , but not to audiogram configuration [5,20] . In the present study, the incidence of an elevated SP/AP ratio was significantly higher in ears with moderate or severe deafness of 1 30 dB, regardless of disease duration.…”

Section: Discussionmentioning

confidence: 99%

The Clinical Value of Extratympanic Electrocochleography in the Diagnosis of Ménière’s Disease

Takeda

Kakigi

2010

ORL

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Objective: To evaluate the clinical conditions causing an elevation in the click-evoked summation potential (SP)/action potential (AP) amplitude ratio (SP/AP ratio), the cause of the SP enhancement in Ménière’s disease (MD) and the diagnostic efficacy of electrocochleography (ECoG) were discussed. Study Design: Retrospective case review. Setting: An outpatient clinic of the Otolaryngology Department of Kochi Medical School. Patients: ECoG testing was performed in 632 patients (727 ears) with vertigo/dizziness and/or deafness over a 10-year period (1995–2005). Among them, 334 patients had diagnoses of definite MD, including 95 cases of bilateral involvement. Main Outcome Measures: Audiological thresholds and SP/AP ratio. Results: An enhanced SP was observed in 56.3% of patients with MD. The incidence of an enhanced SP was low in patients for whom the disease duration was 2 years or less and the frequency of attacks was once a year or less, but was significantly higher in cases where the disease duration was 2 years or longer and/or the frequency of attacks was several times a year (Games-Howell test, p < 0.05). The incidence of an enhanced SP was significantly elevated in cases with pure-tone average exceeding 31 dB (Kendall’s rank correlation test, p < 0.001). However, the enhanced SP, once it appeared, did not always disappear in spite of hearing improvement. Hearing improvement induced by the glycerol test also produced no alteration in an SP/AP ratio, and there was no significant difference between the glycerol test results and the incidence of an enhanced SP (χ² goodness-of-fit test). Conclusions: The longer the patients were symptomatic or the severer the ear symptoms, the more likely the ECoG was to be positive. The abnormally elevated SP, once it had appeared, persisted for long periods. Spontaneous and glycerol-induced hearing gains did not result in a decrease in SP/AP ratio. These clinical characteristics of ECoG seem to indicate that the enhanced SP in MD might be caused by the malfunction of hair cells, not by the displacement of the basilar membrane toward the scala tympani.

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“…The TM elec trode is usually a version of a foam tip elec trode [13][14][15] or a chlorided silver wirerayon wick [9,[16][17][18]. A more detailed ac count of TM electrodes is available in a recent review [15] and will not be dealt with here.…”

Section: Extratympanic Versus Transtympanic Recordingsmentioning

confidence: 99%

Cochlear Potentials in Clinical Audiology

Ferraro

Krishnan

1997

Audiol Neurotol

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The recording of cochlear and auditory nerve potentials in humans via Electrocochleography (ECochG) has emerged as a valuable tool for a variety of clinical applications. This review consolidates current research on the use of cochlear potentials Ménière’s disease/ and ECochG in the clinical setting and identifies several areas in need of additional study. Methodological topics discussed include a review of ECochG recording approaches (i.e. trans-tympanic versus extratympanic) and issues related to choice of stimuli (clicks versus tonebursts). The review of current applications for cochlear potentials focuses primarily on the use of ECochG in the identification and treatment of Ménière’s disease/endolymphatic hydrops (MD/ELH). Other uses for ECochG also are presented (e.g. intraoperative monitoring, enhancement of ABR wave I, estimation of hearing sensitivity). Several suggestions are offered to maximize the predictive value of ECochG in the diagnosis of MD/ELH.

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Electrocochleography and Symptoms of Inner Ear Dysfunction

Cited by 83 publications

References 6 publications

Electrocochleographic findings in superior canal dehiscence syndrome

Electrocochleographic findings in superior canal dehiscence syndrome

The Clinical Value of Extratympanic Electrocochleography in the Diagnosis of Ménière’s Disease

Cochlear Potentials in Clinical Audiology

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