Correlation between NRT measurement level and behavioral levels in pediatrics cochlear implant patients

Muhaimeed, Hamad Al; Anazy, Fatma Al; Hamed, O.M.S.; Shubair, Eba’a

doi:10.1016/j.ijporl.2009.12.017

Cited by 28 publications

(22 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, fitting methods based on objectively measured parameters have been sought. Different researchers tried to use electrically-evoked auditory brainstem responses, electrically-evoked stapedius reflex thresholds or measurements of the electrically-evoked compound action potentials (ECAP) [Mittal and Panwar, 2009;Muhaimeed et al, 2010;Pau et al, 2011;Van Den Abbeele et al, 2012]. Even though the correlations of these measures with the behavioural thresholds (T levels) and hearing comfort levels (C levels) are relatively weak [Holstad et al, 2009;Potts et al, 2007;Smoorenburg et al, 2002;Tao et al, 2011] for particular electrodes, fittings based on the objective profiles with subsequent behavioural adaptation of the 'shift and tilt' [Hughes et al, 2001;King et al, 2006;Smoorenburg et al, 2002] are widely used and currently rank among the best available options.…”

Section: Introductionmentioning

confidence: 99%

Postimplantation Changes of Electrophysiological Parameters in Patients with Cochlear Implants

Molisz

Zarowski²,

Vermeiren³

et al. 2015

Audiol Neurotol

View full text Add to dashboard Cite

Objective: To evaluate the postoperative changes of the basic electrophysiological and psychophysical parameters in cochlear implant (CI) patients: the impedance of the electrode contacts, the electrically-evoked compound action potential (ECAP) thresholds and the T/C levels. Study Design and Setting: Retrospective case review in a quaternary otologic referral centre. Materials and Methods: Data on the impedance of the electrode contacts, the ECAP thresholds and the T/C levels were collected in 20 consecutive CI patients divided into 2 groups. Group 1 comprised 10 prelingually deaf children implanted before the age of 18 months, and group 2 comprised 10 postlingually deaf adults (average age of 58 years). All patients were users of the Nucleus 24RECA (Freedom, Contour advance off-stylet electrode) CI. Results and Conclusions: (1) The mid-portion and the apical electrodes showed a decrease in the impedance values between the 1st and the 6th postoperative months and stabilization in the later course. Impedance of the most basal electrodes grew during the first postoperative months and stabilized later on, but remained higher than the impedance of the mid-portion and the apical electrodes. (2) The neural response telemetry threshold values tended to decrease within the first 3 months after surgery to reach a plateau afterwards. (3) The behavioural threshold levels remained generally stable, except for the basal electrodes where a decrease could be observed. The hearing comfort levels showed an increase during the first 6 months of the implant use and remained stable afterwards.

show abstract

Section: Introductionmentioning

confidence: 99%

Postimplantation Changes of Electrophysiological Parameters in Patients with Cochlear Implants

Molisz

Zarowski²,

Vermeiren³

et al. 2015

Audiol Neurotol

View full text Add to dashboard Cite

show abstract

“…However, electrophysiological measures such as EABR and ECAP do not necessarily correlate with behavioral threshold or comfort levels. Several studies have evaluated the relationship between eSRT, EABR, and ECAP and behavioral threshold and comfort levels (11–13) and found that ECAP threshold data were highly variable and tended to underpredict behavioral comfort levels. EABR was found to better predict behavioral threshold levels than comfort levels.…”

mentioning

confidence: 99%

Relationship Between Electrode-to-Modiolus Distance and Current Levels for Adults With Cochlear Implants

Davis

Zhang

Gifford

et al. 2016

Otology &Amp; Neurotology

View full text Add to dashboard Cite

Hypothesis Electrode-to-modiolus distance is correlated with clinically-programmed stimulation levels. Background Conventional wisdom has long supposed a significant relationship between cochlear implant (CI) stimulation levels and electrode-to-modiolus distance; however, to date, no such formal investigation has been completed. Thus the purpose of this project was to investigate the relationship between stimulation levels and electrode-to-modiolus distance. A strong correlation between the two would suggest that stimulation levels might be used to estimate electrode-to-modiolus geometry. Methods Electrode-to-modiolus distance was determined via CT imaging using validated CI position analysis software in 137 implanted ears from the three manufacturers holding FDA approval in the United States. Analysis included 2,365 total electrodes, with 1,472 from pre-curved arrays. Distances were compared to clinically-programmed C/M levels which were converted to charge units. Results Mean modiolar distance with perimodiolar and lateral wall electrodes was 0.47 mm and 1.15 mm, respectively. Mean suprathreshold charge values were significantly different between each manufacturer. When combining all data, we found a moderate positive correlation (r = 0.367, p <0.01) that was driven both by the different charge values across companies, and that the company with the highest mean charge values only offers straight electrode arrays. When grouped by electrode type, however, we found a weak correlation (r = 0.12, p <0.01) for perimodiolar array electrodes only. When considering a single array type from any one manufacturer, only one was observed where distance mildly predicted charge. Conclusion Our results suggest that electrode distance minimally contributes to the current level required for suprathreshold stimulation.

show abstract

“…Some other studies, in accordance with the design of the studies, included subjects of wide range of ageschildren and adults together [29,31,61]. Some studies included prelingually deaf children of various ages [32,33,36,39] and some included only young children [37,43,47,62]. There are also studies that compared results of children vs. adults.…”

Section: Discussionmentioning

confidence: 99%

“…Many previous studies have shown that ECAP thresholds fall inside dynamic ranges, what made that procedure useful in programming young children [35,36]. According to some authors these thresholds usually fall within the same proportion of a subject's dynamic range across electrodes [33,35,37]. There are also studies that showed that relationship between ECAP thresholds and map levels are not simple and uniform [38,39].…”

Section: Introductionmentioning

confidence: 99%

Differences between electrically evoked compound action potential (ECAP) and behavioral measures in children with cochlear implants operated in the school age vs. operated in the first years of life

Vlahović¹,

Šindija²,

Aras³

et al. 2012

International Journal of Pediatric Otorhinolaryngology

View full text Add to dashboard Cite

Correlation between NRT measurement level and behavioral levels in pediatrics cochlear implant patients

Cited by 28 publications

References 5 publications

Postimplantation Changes of Electrophysiological Parameters in Patients with Cochlear Implants

Postimplantation Changes of Electrophysiological Parameters in Patients with Cochlear Implants

Relationship Between Electrode-to-Modiolus Distance and Current Levels for Adults With Cochlear Implants

Differences between electrically evoked compound action potential (ECAP) and behavioral measures in children with cochlear implants operated in the school age vs. operated in the first years of life

Contact Info

Product

Resources

About