Korean J Otorhinolaryngol-Head Neck Surg.  2013 Apr;56(4):201-205. 10.3342/kjorl-hns.2013.56.4.201.

A Longitudinal Study of Frequency Specific Electrical Stimulation Levels in Cochlear Implant Users

• Thak PK
• Chang J
• Park EH
• Park S
• Jung KJ
• Im GJ

• KMID: 1426495
• DOI: http://doi.org/10.3342/kjorl-hns.2013.56.4.201

Abstract

BACKGROUND AND OBJECTIVES
The purpose of the study was to evaluate the changes in electrical stimulation levels, i.e. threshold (T) levels, comfortable (C) levels, dynamic range (DR), and electrode impedance values (EIVs) during the first year in cochlear implant users.
SUBJECTS AND METHOD
The maps of 49 cochlear implant users (at least 1 year mapping), using the Nucleus device, were examined at the time of initial connection, and at 6 and 12 months post-initial stimulation. T levels, C levels, DR and EIVs were analyzed according to three frequency levels.
RESULTS
During the first 6 months of implant use, C levels and DR increased significantly whereas T levels were stable. EIVs of current carrying electrodes decreased significantly from the connection to the 12-month visit. The changes of electrical stimulation levels did not differ among three frequency levels during the entire follow-up.
CONCLUSION
During the first 6 months of implant use, C levels and DR increased significantly. Thus, an appropriate mapping in the first 6 month is critical to setup hearing capacity in implant users. The mapping should be performed under the best communication environment between the audiologist and the patient, and it makes correct setting of T levels from the initial connection period.

Keyword

Auditory threshold; Cochlear implants; Electric impedance; Hearing

MeSH Terms

Auditory Threshold
Cochlear Implants
Electric Impedance
Electric Stimulation
Electrodes
Hearing
Humans
Lifting
Longitudinal Studies