Electrophysiologic changes after 'pullback' of the slim modiolar electrode – first clinical impressions

Introduction:

The exact position of the cochlearimplant electrode array should be within scala tympani for a satisfying audiological outcome. If the electrode array gets closer to the modiolus lower NRT thresholds and a better audiological outcome can be expected. With the pullback technique an electrode position closer to the modiolus can be achieved. The aim of our study was the detection of electrophysiologic characteristics after the pullback.

Methods:

In a prospective monocentric study ten patients were implanted with the slim modiolar electrode array. After complete insertion NRT thresholds and impedances were measured. After the pullback NRT thresholds and impedances were measured again. Postoperative the position of the electrode array was determined with a flat panel tomography.

Results:

Significant lower NRT thresholds were detected after the pullback between the eleventh and eight electrode. The position of the electrode array was verified within scala tympani in all patients.

Conclusion:

Cochlearimplantation for the hearing impared patients with bilateral or unilateral deafness has become a major role in the rehabilitation process. Perimodiolar electrode arrays are closer to the modiolus and have lower NRT thresholds. Significant lower NRT thresholds were observed after an electrode pullback. Nevertheless so called semidead and dead spiral ganglion cells regions should be kept in mind.

Publication History

Publication Date:
23 April 2019 (online)