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October 1994

Electrically Evoked Auditory Brain-Stem Response in Pediatric Patients With Cochlear Implants

Author Affiliations

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

Arch Otolaryngol Head Neck Surg. 1994;120(10):1083-1090. doi:10.1001/archotol.1994.01880340029006

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)

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