title: Electrically evoked compound action potential (ECAP) in cochlear implant children: Changes in auditory nerve response in first year of cochlear implant use.
abstract: OBJECTIVE
  Recording of the electrically evoked compound action potential (ECAP) of the auditory nerve in cochlear implant (CI) patients represents an option to assess changes in auditory nerve responses and the interaction between the electrode bundle and the neural tissue over time. The aim of the present work is to assess ECAP changes during the first year of cochlear implant for the purpose of predicting thresholds and adjustment of the patients' programs over time.
  
  
  METHODS
  Data were collected from 25 children using Cochlear Nucleus 24 implants. ECAP thresholds were examined at the time of surgery, at initial stimulation, and 3, 6 and 12 months post-stimulation. Five electrodes located at basal, middle, and apical positions in the cochlea were tested at each time interval and ECAP thresholds were analyzed and compared.
  
  
  RESULTS
  There was a significant decrease in ECAP thresholds between the intraoperative measure and fitting time at all electrode sites. Mean ECAP thresholds measured at 3, 6 and 12 months post-stimulation remained similar to initial stimulation levels. Although there was no significant difference in ECAP thresholds recorded at fitting time and 12 months follow up session, there was significant increase in behavioral T and C levels from initial stimulation to the 12 months' time point.
  
  
  CONCLUSIONS
  Most electrodes undergo non-significant change in ECAP thresholds over time, and therefore thresholds obtained on the day of initial stimulation can be used to estimate the patients' map levels at any time. On the other hand, intraoperative thresholds demonstrated significant change relative to postoperative recording times, limiting the ability to use intraoperatively recorded ECAP thresholds to predict postoperative measurements.
authors: Otology& Neuro-otology, Otorhinolaryngology Department, Faculty of Medicine, Dammam University, Dammam, Saudi Arabia.
authors: Laila M
authors: LM
authors: Telmesani
authors: Audiology, Otolaryngology Department, Faculty of Medicine, Dammam University, Dammam, Saudi Arabia; Audiology, Otorhinolaryngology Department, Faculty of Medicine, Ain Shams University, Cairo, Egypt. Electronic address: nithreens@yahoo.com.
authors: Nithreen M
authors: NM
authors: Said
mesh_terms: D000200:Action Potentials; D001309:Auditory Threshold / Q000502:physiology; D002648:Child; D002675:Child, Preschool; D003051:Cochlea; D019929:Cochlear Implantation / Q000009:adverse effects / Q000379:methods*; D003054:Cochlear Implants / Q000009:adverse effects*; D003056:Cochlear Nerve / Q000503:physiopathology*; D007758:Ear, Inner; D005071:Evoked Potentials / Q000502:physiology*; D005260:Female; D005500:Follow-Up Studies; D034381:Hearing Loss / Q000503:physiopathology / Q000601:surgery*; D006801:Humans; D007223:Infant; D008297:Male; D011184:Postoperative Period
keywords: Auditory response; Cochlear implant; Cochlear nerve; Electrically evoked compound action potential (ECAP); Neural response telemetry (NRT)