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Titolo:
The importance of human cochlear anatomy for the results of modiolus-hugging multichannel cochlear implants
Autore:
Frijns, JHM; Briaire, JJ; Grote, JJ;
Indirizzi:
Leiden Univ, Med Ctr, Dept Ear Nose & Throat, NL-2300 RC Leiden, Netherlands Leiden Univ Leiden Netherlands NL-2300 RC NL-2300 RC Leiden, Netherlands
Titolo Testata:
OTOLOGY & NEUROTOLOGY
fascicolo: 3, volume: 22, anno: 2001,
pagine: 340 - 349
SICI:
1531-7129(200105)22:3<340:TIOHCA>2.0.ZU;2-J
Fonte:
ISI
Lingua:
ENG
Soggetto:
ELECTRICALLY STIMULATED COCHLEA; ROTATIONALLY SYMMETRICAL MODEL; EXCITATION PATTERNS; VOLUME CONDUCTION; NEURAL EXCITATION; AUDITORY-NERVE; ELECTRODES; POSITION; SINGLE; EAR;
Keywords:
cochlear anatomy; cochlear implant; modiolus-hugging electrode; computational model;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Citazioni:
22
Recensione:
Indirizzi per estratti:
Indirizzo: Frijns, JHM Leiden Univ, Med Ctr, Dept Ear Nose & Throat, Room J2-57,POB 9600, NL-2300RC Leiden, Netherlands Leiden Univ Room J2-57,POB 9600 Leiden Netherlands NL-2300 RC
Citazione:
J.H.M. Frijns et al., "The importance of human cochlear anatomy for the results of modiolus-hugging multichannel cochlear implants", OTOL NEURO, 22(3), 2001, pp. 340-349

Abstract

Hypothesis: The fact that the anatomy of the basal turn of the human cochlea, especially, is essentially different from that of other species is likely to influence the outcome of cochlear implantation. Background: Multichannel cochlear implants give better speech understanding than single-channel devices. They are intended to make use of the tonotopic organization of the cochlea by selectively stimulating subpopulations ofthe auditory nerve. At higher stimulus levels and with monopolar stimulation, excitation of nerve fibers from other turns may interfere with this concept, especially with modiolus-hugging electrodes. Methods: A three-dimensional spiraling computer model of the human cochlea, based on histologic data, was used to test the spatial selectivity and the dynamic range before cross-turn stimulation takes place for the Clarion HiFocus implant with and without a positioner. The results were compared with a similar model of the guinea pig cochlea. Results: In humans (in contrast to the guinea pig), a well-designed modiolus-hugging electrode yielded reduced current thresholds and high spatial selectivity without reduction of the useful dynamic range. The apical turn ofthe human cochlea, however, is largely comparable in this respect with theguinea pig cochlea, where cross-turn stimulation reduces the dynamic rangesubstantially. Conclusion: The clinical success of cochlear implantation in humans and the favorable results with modiolus-hugging devices depend on the anatomy of the human cochlea.

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Documento generato il 29/02/20 alle ore 00:34:26