To Evaluate the Correlation of Electrophysiological Tests and Behavioral responses in Cochlear Implant Patients

Nithya, P (2020) To Evaluate the Correlation of Electrophysiological Tests and Behavioral responses in Cochlear Implant Patients. Masters thesis, Madras Medical College, Chennai.


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INTRODUCTION: Cochlear implants are the true bionic sense organs. They convert the sound signal to electrical signals which stimulates the nerve fibres of the vestibulocochlear nerve directly. Thus it replaces the transducer function of the hair cells of the cochlea, which was not functioning. Cochlear implantation (CI) is considered in patients with severe to profound hearing loss who are not benefited from appropriate and well-fitting hearing aids. Congenital profound hearing loss limits the ability to develop communication skills by affecting auditory and lingual development in children. Cochlear Implantation restores the important special sense. It provides greater access to sound, speech understanding, auditory abilities and linguistic development. Hearing impairment should be detected early so that implantation can be done earlier to improve the quality of life in deaf children. Hence the introduction of high-risk newborn hearing screening as a routine procedure in detection of hearing loss in early life helps in early rehabilitation with implantation in children with severe – profound hearing loss. It helps in improving the quality of life in children with hearing impairment and also earlier the implantation better the outcome in terms of speech and language development. AIMS AND OBJECTIVES: 1. To evaluate the correlation of multimodal electrophysiological tests and behavioral responses in post cochlear implant children. 2. To evaluate the correlation of intraoperative ESRT and postoperative ESRT. STUDY DESIGN: Prospective study. STUDY CENTRE: The study was conducted at Upgraded Institute of otorhinolaryngology and Institute of speech and hearing, Madras Medical College, Rajiv Gandhi Government General Hospital, Chennai. SAMPLE SIZE: 17. DURATION OF STUDY: The study was conducted from September 2017 to October 2019 – 2 years period. INCLUSION CRITERIA: 1. Patients with severe to profound hearing loss. 2. Age: 1- 6yrs. 3. Patients with normal inner ear anatomy. EXCLUSION CRITERIA: 1. Patients with inner ear abnormality. MATERIALS AND METHODS: Intraoperative electrophysiological tests like Impedance field telemetry, ART, ESRT and postoperative Impedance field telemetry, ART, ESRT and EABR was measured. Behavioural response using aided audiogram and audiological assessment using CAP score was done. RESULTS: In our study, the overall postoperative response in ART is 70.5%, ESRT response is 78.4% and EABR response is 96%, whereas the behavioural response is 100%. ART shows least responses, then comes ESRT. EABR responses shows more correlation with behavioural responses. CONCLUSION: In the postoperative period, compared to ART and ESRT responses, the percentage of EABR responses are higher, hence it is useful in assessing the electrode function accurately and shows significant correlation with objective test like aided audiogram and subjective audiological assessment using CAP score than other tests.

Item Type: Thesis (Masters)
Additional Information: 221714006
Uncontrolled Keywords: Electrically evoked Stapedial Reflex Telemetry (ESRT), ART, Electrically evoked Auditory Brain stem Response (EABR), AIDED AUDIOGRAM, Categories of Auditory Performance score (CAP).
Subjects: MEDICAL > Otolaryngology
Depositing User: Subramani R
Date Deposited: 15 Feb 2021 02:58
Last Modified: 15 Feb 2021 02:58

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