Evolution of impedance values in two different electrode array designs following activation of cochlear implants 1 day after surgery: A study of 58 patients

Hu, Hao-Chun; Chen, Joshua Kuang‐Chao; Li, Lieber Po‐Hung; Chen, William Kuan‐Hua; Huang, Mei‐Jui; Yeh, Chia-Hsin; Chen, Li-ching; Tung, Tao‐Hsin

doi:10.1111/coa.13327

Cited by 10 publications

(9 citation statements)

References 10 publications

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“…As reported in a previous study using the Nucleus implant system, a signi cant reduction in impedance for all electrode contacts from slim modiolar electrodes was also observed from the early switch-on group in the present study 18,24 . In contrast, other studies using the MED-EL or the Advanced Bionics implant system showed no signi cant decrease in impedance at early switch-on 19,20,25 20,22 . To the best of our knowledge, this is the rst study to report the time course of the postoperative impedance levels for a slim modiolar electrode array.…”

Section: Discussionmentioning

confidence: 67%

“…Previous studies have identi ed that the time course of impedance values differ according to the type of electrode array, and even within the electrode array the trend of impedance changes varies across the electrode array 18,[20][21][22] . However, longitudinal changes in impedance over the long-term for slim modiolar electrode arrays have not been previously investigated.…”

Section: Discussionmentioning

confidence: 99%

“…Since the e cacy and safety of early switch-on within 24 h of surgery has previously been con rmed 17 , many CI centers, including ours, have changed the switch-on protocol over the past few years from the initial tting at 3-6 weeks post-surgery to the day after surgery. Previous studies investigating the evolution of electrode impedance after early switch-on have shown inconsistent results according to the type of electrode array [18][19][20] . To the best of our knowledge, this is the rst study to describe changes in the impedance of slim modiolar electrodes over time in CI recipients who were rehabilitated with the conventional and early switch-on protocols.…”

Section: Introductionmentioning

confidence: 98%

See 2 more Smart Citations

Effect of Initial Switch-On Within 24 Hours of Cochlear Implantation Using Slim Modiolar Electrodes: Potential Clinical Implications

Sunwoo

Jeon

Choi

2021

Preprint

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Reducing electrode impedance is an important factor in improving the functional benefits of cochlear implants (CIs). The immediate effect of early switch-on within 24 hours of surgery on impedance among CI recipients with various types of electrodes has been reported previously; however, the immediate change and the evolution of electrode impedances of slim modiolar electrodes after early switch-on within 24 hours of implantation has not. Therefore, the focus of this study was to compare the effect of early switch-on and conventional switch-on 3–4 weeks post-operation on impedance. Compared with impedance measured intraoperatively, our results demonstrate a significant drop in impedance for early switch-on, which sharply contrasted with elevated impedance values for conventional switch-on 3–4 weeks after implantation. Notably, a comparatively lower impedance than the conventional switch-on protocol was observed for up to 2 months post-operation. Most importantly, a much earlier stabilization of impedance can be achieved with the early switch-on protocol coupled with the slim modiolar electrode array compared to the conventional switch-on protocol, offering the advantage of reducing the number of required mapping sessions in the early stages of rehabilitation.

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Section: Discussionmentioning

confidence: 67%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

See 1 more Smart Citation

Effect of Initial Switch-On Within 24 Hours of Cochlear Implantation Using Slim Modiolar Electrodes: Potential Clinical Implications

Sunwoo

Jeon

Choi

2021

Preprint

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“…The higher EI values in the apical segment may be attributed to the physical characteristics of the Med-El electrode [12]. Furthermore, higher impedance values in the apical segment could be induced by trauma during electrode insertion [13,14].…”

Section: Discussionmentioning

confidence: 99%

High Electrode Impedance Values in Pediatric Cochlear Implant Recipients May Imply Insufficient Auditory and Language Skills Development

Brkic

Umihanić

Harcinovic

et al. 2020

JCM

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Background: Measurements of electrode impedance values are routinely performed after cochlear implantation. The primary objective of the study was to determine if pediatric, prelingually deafened patients with different postoperative performances showed significantly different impedance values one year after implantation. Methods: This study comprised 42 pediatric cochlear implant recipients provided with the device in a single academic tertiary referral center between 1 January 2000, and 31 December 2016. Medical chart analysis was performed in order to assess evolution of impedance values during the first postoperative year on a monthly basis. Electrode impedance values measurements one year postoperatively were compared between children with successful and unsuccessful auditory and language skills development assessed using the EARS protocol (a name of a performance test). Furthermore, values were compared among recipients of different implant types and among different cochlear segments. Results: A gradual rise of average impedance values was found during the first months of implant use (1st month, 7.32 kΩ; 3rd month, 7.86 kΩ) with the peak at the 4th postoperative month (7.96 kΩ), followed by a gradual decrease towards the 12th month (6th month, 7.62 kΩ; 12th month, 6.86 kΩ). Lower values at the 12th postoperative month were observed in recipients with successful development compared to patients presented with unsuccessful development (6.22 kΩ vs. 7.82 kΩ; p = 0.001). Mean impedance values were different when compared among cochlear segments and among different implant types. Conclusion: High electrode impedance values one year after implantation in pediatric patients may imply insufficient auditory and language skills development. Further studies are needed in order to validate our results.

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“…5 Over the years, several other groups have published their experiences with early activation, ranging from 13 days to the day of surgery in the recovery room. [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] An increasing number of publications from a select group of CI centers suggest increased acceptance of these protocols, although no data exist as to how common this practice is in reality.…”

Section: Historymentioning

confidence: 99%

Very early activation of cochlear implants: A review of the literature

Coelho

Shiao

2022

Journal of the Chinese Medical Association

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Cochlear implantation (CI) has become the standard treatment for patients with severe-to-profound hearing loss. To date, an estimated 750,000 individuals spanning the entire lifecycle have benefited from this life-changing technology. Traditionally, the device is not “activated” for 3 to 4 weeks after surgery. However, an increasing number of centers have recently begun to question the conventional wisdom that several weeks are necessary and are activating their patients’ device sooner after CI. This review aimed to provide a comprehensive insight to better understand the feasibility, outcomes, benefits, and limitations of very early cochlear implant activation. Data sources from published medical literature were reviewed. A detailed examination and summary were provided. History and safety were also emphasized. It was observed that approximately 20 studies have reported their experience with very early cochlear implant activation, ranging from the day of surgery to 1 week. Outcome measures are disparate, although there is general agreement that early activation is not only feasible but also provides some real-life benefits to patients and caregivers. The surgical, electrophysiological, audiological, and other outcomes were also reviewed. Very early activation is safe and beneficial in patients with cochlear implants. Many CI centers believe that such a process can lead to improvements in both patient-centered and fiscally responsible care. Although not ideal for all patients, cochlear implant programs may consider this option for their patients.

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Evolution of impedance values in two different electrode array designs following activation of cochlear implants 1 day after surgery: A study of 58 patients

Cited by 10 publications

References 10 publications

Effect of Initial Switch-On Within 24 Hours of Cochlear Implantation Using Slim Modiolar Electrodes: Potential Clinical Implications

Effect of Initial Switch-On Within 24 Hours of Cochlear Implantation Using Slim Modiolar Electrodes: Potential Clinical Implications

High Electrode Impedance Values in Pediatric Cochlear Implant Recipients May Imply Insufficient Auditory and Language Skills Development

Very early activation of cochlear implants: A review of the literature

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