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Arch Otolaryngol Head Neck Surg. 2005 Jun;131(6):488-92.

Predicting basal cochlear length for electric-acoustic stimulation.

Author information

1
Department of Otorhinolaryngology, J.W. Goethe University, Frankfurt am Main, Germany. adunka@em.uni-frankfurt.de

Abstract

OBJECTIVE:

To assess the feasibility and accuracy of predicting electrode insertion depth necessary in cochlear implantations for electric-acoustic stimulation by means of preoperative high-resolution computed tomography (HRCT).

DESIGN:

Human temporal bone study with evaluation of cochlear dimensions.

SETTING:

Tertiary care medical center.

METHODS:

Eight fresh human temporal bones were scanned, and basal cochlear structures were reconstructed and measured. Standard cochlear implantations with a free-fitting array were performed, and the bones then underwent histologic analysis using a technique that allows sectioning of undecalcified bones. After embedding, all bones underwent conventional radiologic analysis with further insertion measurements. Preimplantation HRCT data were compared with radiologic and histologic data.

RESULTS:

Preimplantation HRCT-based measurements correlated very well with postimplantation radiologic data. A mean failure of 0.3 mm was found. Mean values for the first 360 degrees ranged from 18.8 to 22.0 mm.

CONCLUSIONS:

Preimplantation HRCT-based prediction of cochlear implant insertion depths is both feasible and accurate. It is especially useful when aiming for hearing preservation, where insertion depths of 360 degrees are necessary.

PMID:
15967880
DOI:
10.1001/archotol.131.6.488
[Indexed for MEDLINE]

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