Factors affecting outcome of cochlear implant: an observational study

Parth Patni, Deepak Dalmia, Udayanila T., Harish Katakdhond, Karthika Bhagavan


Background: Aim and objectives of the study was to evaluate various factors affecting outcome in cochlear implant surgery.

Methods: A hospital based retrospective observational study in which 51 patients who underwent cochlear implant surgery from July 2017 to January 2019 were evaluated at Dr. Babasaheb Ambedkar Memorial Hospital, Byculla, Mumbai using 3 parameters i.e. Revised CAP score (CAP), meaningful auditory integration scale (MAIS), speech intelligibility rating (SIR) at various intervals postoperatively and outcome was evaluated.

Results: It was found that the postoperative mean scores in all age groups were comparable but not significant at 3, 6 and 9 months interval while the difference was statistically significant at 12 and 24 months interval post implantation with less than 2 years age group performing better than other age groups patients with less than 2 years duration of auditory deprivation, the mean scores were found to be statistically significant at 12 and  24 months implantation Relationship to common causes such as prenatal infections, low birth weight, prolonged labour, hyperbilirubinemia, meningitis and consanguineous marriage were considered but not significant. No significant difference was observed in parent’s education level, urban-rural population to the outcome of cochlear implantation.

Conclusions: Two most important factors that affect the outcome cochlear implantation are the age at implantation and the duration of auditory deprivation. Other factors are important but not significant and do not affect the outcome significantly.


Cochlear implant, Congenital sensorineural hearing loss, Age at implantation, CAP score, SIR score, MAIS score

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Carrasco L, Pavez E, Délano PH. Disparity Potential-Mismatch Negativity. Review Articles. Rev. Otorrinolaringol. Cir. Head Neck. 2008; 68: 185-92.

Rabelo CM. Auditory processing: Compressed speech test in Portuguese in normal hearing adults. [Dissertation]. São Paulo (SP): Faculty of Medicine, University of São Paulo; 2004.

Allen C, Nikolopoulos TP, Dyar D, O’ Donohogue GM. Reliability of a rating scale for measuring speech intelligibility after paediatric cochlear implantation. otol Neurotol. 2001;631-3.

Archbold S, Lutman ME, Marshall DH. Categories of Auditory Performance. Ann Otol Rhinol Laryngol Suppl.1995;166:312-4.

Robbins AM, Renshaw JJ, Berry SW, Evaluating Meaningful auditory integration in profoundly hearing-impaired children. Am J Otol. 1991;144-50.

Hashemi SB, Monshizadeh L. Comparison of Auditory Perception in Cochlear Implanted Children with and without Additional Disabilities. Iran J Med Sci. 2016;41(3):186-90.

Govaerts PJ1, De Beukelaer C, Daemers K, De Ceulaer G, Yperman M, Somers T, Schatteman I, Offeciers FE. Outcome of cochlear implantation at different ages from 0 to 6 years. Otol Neurotol. 2002;23(6):885-90.

Suh Myung-Whan , Cho Eung, Kim Bong Jik, Chang Sun O, Kim Chong , Oh Seung-Ha. Long Term Outcomes of Early Cochlear Implantation in Korea. Clinical and experimental otorhinolaryngology. 2009;2:120-5.

Anderson I, Weichbold V, D'Haese PS, Szuchnik J, Quevedo MS, Martin J. Cochlear implantation in children under the age of two - What do the outcomes show us? Int j pediatric otorhinolaryngol. 2004;68(4):425-431.

Dunn CC, Walker EA, Oleson J, Kenworthy M, Voorst TV, Tomblin JB et al. Longitudinal speech perception and language performance in pediatric cochlear implant users: the effect of age at implantation. Ear Hear. 2014;35(2):148-60.

Tobey EA, Thal D, Niparko JK, Eisenberg LS, Quittner LA, Wanget NY al. Influence of implantation age on school-age language performance in pediatric cochlear implant users. Int J Audiol. 2013;52(4):219-29.

Gupta D. A predictive model for outcome of cochlear implantation in children below the age of 5 years: A multivariate analysis in Indian scenario: Indian Journal of Otology. 2012;18(3):129-35.

Atas B, Altunhan H, Eryilmaz MA, Atas E. Frequency of congenital hearing loss in 43 503 healthy newborn infants in Konya, Turkey. J Pak Med Assoc. 2011;61:727-8.

Calháu CM, Lima Júnior LR, Reis AM, et al. Perfil etiológico dos pacientes implantados do Programa de Implante Coclear [Etiology profile of the patients implanted in the cochlear implant program]. Braz J Otorhinolaryngol. 2011;77(1):13-8.

J Jenson. Malformations of the inner ear in deaf children. Acta Radiol. 1969;286:44-8.