Bilateral Cochlear Implantation - A Case Report

Mawman, DJ; Rt, Ramsden; O’Driscoll, Martin; Adams, Tony; Saeed, Shakeel R

doi:10.1159/000059132

Cited by 3 publications

(8 citation statements)

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“…It exploits the fact that with bilateral CI and at least one noise source that is spatially set apart from a target speaker, the ear with the more favorable SNR due to the acoustic head shadow can be used. In all studies, using noise coming from the side, a benefi t of bilateral CI due to the head shadow effect has been found [Au et al, 2003;Gantz et al, 2002;Mawman et al, 2000;Müller et al, 2002;Tyler et al, 2002aTyler et al, , 2003van Hoesel et al, 2002;van Hoesel and Tyler, 2003;Vermeire et al, 2003].…”

Section: Introductionmentioning

confidence: 91%

“…First reports have shown improved speech understanding in noise with bilateral CI when compared with unilateral CI [Au et al, 2003;Tyler et al, 2002aTyler et al, , 2003van Hoesel and Tyler, 2003;Gantz et al, 2002;Mawman et al, 2000;Schön et al, 2002;Vermeire et al, 2003;van Hoesel et al, 2002]. In a few studies, even an improvement of speech intelligibility in quiet has been found Vermeire et al, 2003].…”

Section: Introductionmentioning

confidence: 99%

“…Substantial advantages in sound localization skills have been found in patients using bilateral CI in comparison with unilateral CI using various test protocols [Gantz et al, 2002;Tyler et al, 2002aTyler et al, , 2003Lawson et al, 1998;Mawman et al, 2000;van Hoesel and Tyler, 2003;van Hoesel et al, 2002]. However, to date the lower limit of spatial discrimination in bilateral CI users, which would enable a comparison with normally hearing subjects has not been directly measured.…”

Section: Introductionmentioning

confidence: 99%

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Minimum Audible Angle, Just Noticeable Interaural Differences and Speech Intelligibility with Bilateral Cochlear Implants Using Clinical Speech Processors

Senn¹,

Kompis²,

Vischer³

et al. 2005

Audiol Neurotol

105

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Sound localization and speech intelligibility were assessed in 5 patients implanted bilaterally with Medel C40+ or Medel C40 cochlear implant (CI) systems. The minimum audible angle (MAA) around the head in the horizontal plane was assessed in patients with bilateral CI using white noise bursts of 1000 ms duration presented from a loudspeaker mounted on a rotating boom and compared with the MAA of age-matched normal hearing controls. Spatial discrimination was found to be good in front and in the back of the head with near-normal MAA values (patients: 3–8°, controls: 1–4°). In contrast, poor performance on the sides was found (patients: 30 to over 45°, controls 7–10°). Bilateral CI significantly improved spatial discrimination in front for all patients, when compared with the use of either CI alone. Just noticeable differences (JNDs) in interaural intensity and time were assessed using white noise bursts (1000 ms duration; 50 ms linear ramp). In addition, interaural time JNDs were assessed using click trains (800 ms duration, 40 µs clicks, 50 Hz) and noise bursts in which either only the envelope or only the fine structure was shifted in time. In comparison with normal hearing controls, patients with bilateral CI showed near-normal interaural intensity JNDs but substantially poorer interaural time JNDs depending on the type of stimulus. In contrast to envelope onset/offset cues, interaural fine structure time differences were not perceived by the patients using CI systems employing the continuous interleaved sampling strategy without synchronization between their pulse stimulation times. Speech intelligibility in quiet and CCITT noise from the side (±90°) was assessed using the German HSM sentence test and was significantly better when using bilateral CI in comparison with either unilateral CI, mainly due to a head shadow effect. These favorable results are in agreement with the patients’ subjective experiences assessed with a questionnaire and support the use of bilateral CI.

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Section: Introductionmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Minimum Audible Angle, Just Noticeable Interaural Differences and Speech Intelligibility with Bilateral Cochlear Implants Using Clinical Speech Processors

Senn¹,

Kompis²,

Vischer³

et al. 2005

Audiol Neurotol

105

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“…Thus, interest in bilateral cochlear implantation for persons with bilateral severe to profound hearing loss has been steadily growing over the last decade. A number of studies have now examined speech recognition ability of adults using bilateral cochlear implants (Green, Mills, Bell et al, 1992;Lawson, Wilson, Zerbi, et al, 1998;Mawman, Ramsden, Saeed, et al, 2000;Gantz, Tyler, Rubinstein et al, 2002; Tyler, Gantz, Rubenstein et al, 2002b;Au, Hui, & Wei, 2003;van Hoesel & Tyler, 2003;Dorman & Dahlstrom, 2004), and fewer studies have reported on pediatric bilateral cochlear implant use (Litovsky et al, 2006a;2006b;Vermeire, Brokx, Van de Heyning, et al, 2002;Kuhn-Inacker, Shehata-Deiler, Müller, et al, 2004). Some of these reports were only single case studies, however, and most evaluated only a small group of subjects, partly because bilateral cochlear implantation has remained relatively sparse.…”

Section: Nih-pa Author Manuscriptmentioning

confidence: 99%

“…In addition, anecdotal reports have indicated that most subjects prefer wearing both implants and report improved sound clarity and/or quality for bilateral compared with unilateral implant use (Green et al, 1992;Mawman et al, 2000;Gantz et al, 2002). To our knowledge, however, subjective data have not been collected using a structured questionnaire approach with substantial numbers of bilateral cochlear implant users.…”

mentioning

confidence: 98%

Simultaneous Bilateral Cochlear Implantation in Adults: A Multicenter Clinical Study

Litovsky¹,

Parkinson²,

Arcaroli³

et al. 2006

Ear and Hearing

285

304

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Objective-To determine the efficacy of "simultaneous" bilateral cochlear implantation (both implants placed during a single surgical procedure) by comparing bilateral and unilateral implant use in a large number of adult subjects tested at multiple sites.Design-Prospective study of 37 adults with postlinguistic onset of bilateral, severe to profound sensorineural hearing loss. Performance with the bilateral cochlear implants, using the same speech processor type and speech processing strategy, was compared with performance using the left implant alone and the right implant alone. Speech understanding in quiet (CNCs and HINT sentences) and in noise (BKB-SIN Test) were evaluated at several postactivation time intervals, with speech presented at 0° azimuth, and noise at either 0°, 90° right, or 90° left in the horizontal plane. APHAB questionnaire data were collected after each subject underwent a 3-wk "bilateral deprivation" period, during which they wore only the speech processor that produced the best score during unilateral testing, and also after a period of listening again with the bilateral implants.Results-By 6-mo postactivation, a significant advantage for speech understanding in quiet was found in the bilateral listening mode compared with either unilateral listening modes. For speech understanding in noise, the largest and most robust bilateral benefit was when the subject was able to take advantage of the head shadow effect; i.e., results were significantly better for bilateral listening compared with the unilateral condition when the ear opposite to the side of the noise was added to create the bilateral condition. This bilateral benefit was seen on at least one of the two unilateral ear comparisons for nearly all (32/34) subjects. Bilateral benefit was also found for a few subjects in spatial configurations that evaluated binaural redundancy and binaural squelch effects. A subgroup of subjects who had asymmetrical unilateral implant performances were, overall, similar in performance to subjects with symmetrical hearing. The questionnaire data indicated that bilateral users perceive their own performance to be better with bilateral cochlear implants than when using a single device.Conclusions-Findings with a large patient group are in agreement with previous reports on smaller groups, showing that, overall, bilateral implantation offers the majority of patients advantages when listening in simulated adverse conditions. Persons with bilateral severe to profound sensorineural hearing loss have traditionally received a single cochlear implant. To date, health care professionals have recommended unilateral, rather than bilateral, cochlear implant fittings for these patients for several reasons, including: 1) cost/reimbursement issues, 2) preservation of one ear for future technologies, 3) additional risk of two, or extended, surgeries, and 4) lack of sufficient objective and/or subjective evidence documenting bilateral cochlear implant benefit. Although unilateral use of cochlear implants NIH-PA A...

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Comparison of Music Perception in Bilateral and Unilateral Cochlear Implant Users and Normal-Hearing Subjects

et al. 2009

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Music plays an important role in the daily life of cochlear implant (CI) users, but electrical hearing and speech processing pose challenges for enjoying music. Studies of unilateral CI (UCI) users’ music perception have found that these subjects have little difficulty recognizing tempo and rhythm but great difficulty with pitch, interval and melody. The present study is an initial step towards understanding music perception in bilateral CI (BCI) users. The Munich Music Questionnaire was used to investigate music listening habits and enjoyment in 23 BCI users compared to 2 control groups: 23 UCI users and 23 normal-hearing (NH) listeners. Bilateral users appeared to have a number of advantages over unilateral users, though their enjoyment of music did not reach the level of NH listeners.

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Bilateral Cochlear Implantation - A Case Report

Cited by 3 publications

References 0 publications

Minimum Audible Angle, Just Noticeable Interaural Differences and Speech Intelligibility with Bilateral Cochlear Implants Using Clinical Speech Processors

Minimum Audible Angle, Just Noticeable Interaural Differences and Speech Intelligibility with Bilateral Cochlear Implants Using Clinical Speech Processors

Simultaneous Bilateral Cochlear Implantation in Adults: A Multicenter Clinical Study

Comparison of Music Perception in Bilateral and Unilateral Cochlear Implant Users and Normal-Hearing Subjects

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