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Paul R. Kileny, PhD; Teresa A. Zwolan, PhD; Susan Zimmerman-Phillips, MS; Steven A. Telian, MD

Arch Otolaryngol Head Neck Surg. 1994;120(10):1083-1090.

Abstract
Objective
To study the feasibility and clinical applicability of preoperative, transtympanic electrically evoked auditory brain-stem response (EABR) in a pediatric patient population with cochlear implants.

Design
A descriptive study using repeated measures analyses of variance to determine if EABR measures were affected by response configuration or cochlear status.

Setting
The operating room before cochlear implant surgery.

Patients
A population-based sample of 43 patients aged 2.5 to 14.5 years who were candidates for cochlear implantation.

Intervention
Stimuli consisting of brief balanced biphasic current pulses were provided by a transtympanically placed promontory needle electrode; EABR was recorded with subdermal needle electrodes on the forehead and contralateral mastoid.

Main Outcome Measure
Presence or absence of postoperative electrical excitability with a cochlear implant.

Results
Electrically evoked auditory brain-stem responses were available from 41 of the 43 patients tested. Mean EABR threshold was 406.5 µA (SD=118.1) for 31 patients with patent cochleas and 472 µA (SD=91) for 10 patients with cochlear ossification. Mean wave V latency at threshold was 4.69 milliseconds (SD=0.57).

Conclusion
Preoperative EABR is an integral component of the preoperative selection process for pediatric patients with cochlear implants.

(Arch Otolaryngol Head Neck Surg. 1994;120:1083-1090)

Author Affiliations
From the Department of Otolaryngology, University of Michigan Medical Center, Ann Arbor.

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