Cochlear Hearing Loss
Conditions
Keywords
cochlear implant, threshold of electrically evoked compound action potential, neural response telemetry
Brief summary
After cochlear implantation, cochlear nerve is stimulated by giving a current over the electrodes placed in the cochlea and the current is measured by electrically evoked Compound Action Potential (ECAP).This ECAP is measured intra operatively, after 4 weeks( at switch on), after 3months and 6 months following cochlear implantation.
Detailed description
After cochlear implantation, cochlear nerve is stimulated by giving a current over the electrodes placed in the cochlea and the current is measured by electrically evoked Compound Action Potential (ECAP).This ECAP is measured intra operatively, 4 weeks(at switch on) and after 3months and 6 months following cochlear implantation. Neural Response Telemetry (NRT) is a quick and non-invasive way of recording ECAP of the peripheral auditory nerves in-situ. It gives clinicians valuable information for programming the T- (Threshold) and C-(Comfort) - levels of the recipient's speech processor map. Intraoperative NRT in conjunction with electrode impedance data can help indicate the integrity of the implanted electrodes and the electrode/auditory nerve interface, confirming that the implant is functioning correctly intraoperatively.
Interventions
DEVICECochlear implant
After cochlear implantation, cochlear nerve is stimulated by giving a current over the electrodes placed in the cochlea and the current is measured by electrically evoked Compound Action Potential (ECAP).
Sponsors
Jawaharlal Institute of Postgraduate Medical Education & Research
Study design
Allocation
NA
Intervention model
SINGLE_GROUP
Primary purpose
TREATMENT
Masking
NONE
Eligibility
Sex/Gender
ALL
Age
1 Years to 6 Years
Healthy volunteers
Yes
Inclusion criteria
* All children between 1 and 6 years of age undergoing cochlear implantation in JIPMER during the study period.
Exclusion criteria
* Incomplete electrode array insertion.
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Changes in threshold of ECAP after cochlear implantation. | during implantation, at switch on( 4 weeks), after 3months and 6months. | To evaluate changes in threshold of ECAP during cochlear implantation, at switch on( 4 weeks), after 3 months and 6 months following cochlear implantation. |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Correlate the amplitude of ECAP with T & C levels. | 2 years | Correlating the amplitude of ECAP with threshold and comfortable levels and creating a MAP. |
| Correlate amplitude of ECAP with cochlear nerve diameter measured pre-operatively. | 2 mins | By correlating amplitude of ECAP with cochlear nerve diameter we can determine the site to be operated preoperatively. |
Countries
India
Outcome results
None listed