Impact of auditory cortical asymmetry in cochlear implantation

Kamal, Nadia; Tawfik, Somaia; Mahrous, Mahmoud

doi:10.1179/1467010014z.000000000156

Cited by 3 publications

(17 citation statements)

References 4 publications

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“…No randomised controlled trials (RCTs) were included in the critical appraisal. Two studies were prospective cohort studies, twelve were retrospective cohort studies, five were cross‐sectional studies and one was a case‐control study …”

Section: Resultsmentioning

confidence: 99%

“…One study investigated electro‐physiologically measured syllable discrimination which did not correspond with our predefined inclusion of outcome measures . All of the above resulted in a high DoE in thirteen studies and a low DoE in seven studies …”

Section: Resultsmentioning

confidence: 99%

“…In only seven studies, patients were equally followed‐up at time of testing . All of the above resulted in a low RoB in two studies, moderate RoB in fourteen studies and a high RoB in four studies . One study was described twice, once in a scientific poster and later on in an article, consequently, the poster was excluded from this review.…”

Section: Resultsmentioning

confidence: 99%

“…Finally, twelve studies of which eleven with a high DoE and low or moderate RoB and one study with a high RoB remained for data extraction …”

Section: Resultsmentioning

confidence: 99%

“…Most of the studies were retrospective cohort studies, one prospective cohort study, two cross‐sectional studies and one case‐control study . Six studies analysed children with prelingual SNHL . Eight studies examined the effect of side of implantation in adults with postlingual SNHL .…”

Section: Resultsmentioning

confidence: 99%

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The effect of side of implantation on unilateral cochlear implant performance in patients with prelingual and postlingual sensorineural hearing loss: A systematic review

Kraaijenga

Derksen

Stegeman

et al. 2017

Clinical Otolaryngology

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Objective: Cerebral lateralisation of language processing leads to a right ear advantage in normal hearing subjects. The aim of this study was to present a systematic overview of the effect of implantation side on postoperative cochlear implant performance in patients with symmetrical severe to profound sensorineural hearing loss.Data sources: PubMed, Embase and The Cochrane Library databases.Research methods: Databases were searched from database inception up to 9 January 2017 for cochlear implant and side and all synonyms. Title, abstract and full-text of retrieved articles were screened for eligibility. Then, directness of evidence and risk of bias were assessed. For the included articles, study characteristics and outcome data (hearing and language development) were extracted.Results: 2541 unique articles were screened, of which twenty were eligible for critical appraisal. No randomised controlled trials were identified. Twelve studies with a high directness of evidence remained for data extraction. Four of six studies including children with pre-lingual sensorineural hearing loss and four of seven studies investigating adults with postlingual sensorineural hearing loss found a right ear advantage in at least one outcome measurement related to cochlear implant performance. Conclusion:The available evidence on the effect of side of implantation is of low quality, as study populations and outcome measures are heterogeneous. The majority of studies reveals evidence for a right ear advantage in prelingually deafened children as well as postlingually deafened adults. In view of the present evidence and as no left ear advantage was identified, we cautiously advise implanting the cochlear implant in the right ear when other prognostic factors do not favour the left ear and sensorineural hearing loss is symmetrical.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

“…Finally, twelve studies of which eleven with a high DoE and low or moderate RoB and one study with a high RoB remained for data extraction …”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 3 more Smart Citations

The effect of side of implantation on unilateral cochlear implant performance in patients with prelingual and postlingual sensorineural hearing loss: A systematic review

Kraaijenga

Derksen

Stegeman

et al. 2017

Clinical Otolaryngology

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The evaluation of cochlear implant users’ acoustic change detection ability

KAYA

Türkyılmaz

Yaralı

2022

Hearing, Balance and Communication

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Differential auditory cortical development in left and right cochlear implanted children

Wang

et al. 2022

Cerebral Cortex

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Unilateral aural stimulation has been shown to cause massive cortical reorganization in brain with congenital deafness, particularly during the sensitive period of brain development. However, it is unclear which side of stimulation provides most advantages for auditory development. The left hemisphere dominance of speech and linguistic processing in normal hearing adult brain has led to the assumption of functional and developmental advantages of right over left implantation, but existing evidence is controversial. To test this assumption and provide evidence for clinical choice, we examined 34 prelingually deaf children with unilateral cochlear implants using near-infrared spectroscopy. While controlling for age of implantation, residual hearing, and dominant hand, cortical processing of speech showed neither developmental progress nor influence of implantation side weeks to months after implant activation. In sharp contrast, for nonspeech (music signal vs. noise) processing, left implantation showed functional advantages over right implantation that were not yet discernable using clinical, questionnaire-based outcome measures. These findings support the notion that the right hemisphere develops earlier and is better preserved from adverse environmental influences than its left counterpart. This study thus provides, to our knowledge, the first evidence for differential influences of left and right auditory peripheral stimulation on early cortical development of the human brain.

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Impact of auditory cortical asymmetry in cochlear implantation

Abstract: The present data support that right ear implantation would fasten the development of auditory skills especially in young children, an issue to be considered in unilateral implantation.

Cited by 3 publications

References 4 publications

The effect of side of implantation on unilateral cochlear implant performance in patients with prelingual and postlingual sensorineural hearing loss: A systematic review

The effect of side of implantation on unilateral cochlear implant performance in patients with prelingual and postlingual sensorineural hearing loss: A systematic review

The evaluation of cochlear implant users’ acoustic change detection ability

Differential auditory cortical development in left and right cochlear implanted children

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