Measurement of Comfort Levels by Means of Electrical Stapedial Reflex in Children

Abstract

COCHLEAR implants require programming on an individual basis to provide appropriate levels of electrical stimulation. This program, or "map," is placed in the speech processor of the cochlear implant. Success of implantation largely depends on the adequacy of this map. The map is generated by means of an electrical dynamic range for each active electrode. This range is established by ascertaining a threshold (T) measurement, which serves as the lower limit, and a comfort (C) level, which is the upper limit of electrical stimulation. The T level is defined as the lowest stimulus level producing 100% detection. The C level is obtained by increasing the current from the T level until the patient indicates that the stimulus is loud but comfortable. These levels vary from electrode to electrode as well as among patients. They also vary over time and from one programming session to the next.