Summary of the Systematic Review

Article Citation

A Systematic Review of the Impact of Adjusting Input Dynamic Range (IDR), Electrical Threshold (T) Level and Rate of Stimulation on Speech Perception Ability in Cochlear Implant Users

Nunn, T. B., Jiang, D., et al. (2019).
International Journal of Audiology, 58(6), 317-325.
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Article Quality Ratings

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Indicators of Review Quality

  • Yes The review states a clearly focused question/aim.
  • Yes Criteria for inclusion of studies are provided.
  • Yes Search strategy described in sufficient detail for replication.
  • Yes Included studies are assessed for study quality.
  • No Quality assessments are reproducible.
  • No Characteristics of the included studies are provided.

Article Details

Description

This is a systematic review of experimental studies investigating the impact of programmable cochlear implant (CI) parameters (i.e., input dynamic range (IDR), electrical stimulation threshold (T) level, and electrical stimulation rate per electrode) on speech perception in individuals with a CI.

Questions/Aims Addressed

"In CI users, are adjustments of IDR, T level and rate of electrical stimulation, compared to manufacturer defaults, effective in improving speech perception?" (p. 319).

Population

Individuals with a cochlear implant

Intervention/Assessment

Programmable cochlear implant parameters: T level, IDR, and stimulation rate

Number of Studies Included

32

Years Included

Through January 2, 2016


Conclusions from This Systematic Review

What are Conclusions?

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Treatment

For cochlear implant users, high variability for speech perception outcomes was noted with adjustment of input dynamic range (IDR), electrical stimulation threshold (T) level, and electrical stimulation rate parameters. This review determined the following:
  • "T levels above behavioural threshold or as proportion of [electrical dynamic range] EDR has been demonstrated to improve perception of monosyllables in quiet and sentences in both quiet and in noise" (p. 324);
  • "The use of wider IIDR/IDR setting can improve perception of monosyllables in quiet, particularly at softer presentation intensity. The use of wider IIDR/IDR setting for sentences in quiet and in noise provides mixed outcomes, which would necessitate a systematic evaluation if applied clinically" (p. 324); and
  • "No recommendation could be determined for rate of stimulation as speech perception varied significantly across the stimulation rates examined" (p. 324).

Keywords: Cochlear Implants, Cochlear Implants, Devices, Cochlear Implants, Devices, Devices

Go to Map

Treatment

For cochlear implant users, high variability for speech perception outcomes was noted with adjustment of input dynamic range (IDR), electrical stimulation threshold (T) level, and electrical stimulation rate parameters. This review determined the following:
  • "T levels above behavioural threshold or as proportion of [electrical dynamic range] EDR has been demonstrated to improve perception of monosyllables in quiet and sentences in both quiet and in noise" (p. 324);
  • "The use of wider IIDR/IDR setting can improve perception of monosyllables in quiet, particularly at softer presentation intensity. The use of wider IIDR/IDR setting for sentences in quiet and in noise provides mixed outcomes, which would necessitate a systematic evaluation if applied clinically" (p. 324); and
  • "No recommendation could be determined for rate of stimulation as speech perception varied significantly across the stimulation rates examined" (p. 324).

Keywords: Cochlear Implants, Cochlear Implants, Devices, Cochlear Implants, Devices, Devices

Go to Map

Treatment

For cochlear implant users, high variability for speech perception outcomes was noted with adjustment of input dynamic range (IDR), electrical stimulation threshold (T) level, and electrical stimulation rate parameters. This review determined the following:
  • "T levels above behavioural threshold or as proportion of [electrical dynamic range] EDR has been demonstrated to improve perception of monosyllables in quiet and sentences in both quiet and in noise" (p. 324);
  • "The use of wider IIDR/IDR setting can improve perception of monosyllables in quiet, particularly at softer presentation intensity. The use of wider IIDR/IDR setting for sentences in quiet and in noise provides mixed outcomes, which would necessitate a systematic evaluation if applied clinically" (p. 324); and
  • "No recommendation could be determined for rate of stimulation as speech perception varied significantly across the stimulation rates examined" (p. 324).

Keywords: Cochlear Implants, Cochlear Implants, Devices, Cochlear Implants, Devices, Devices

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