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Objectives: Multiple studies have described the onset and variable incidence of postoperative acute vertigo following cochlear implant (CI) surgery. However, postoperative imaging has not yet been specifically evaluated with special focus on vertigo. The aim of this study is to assess the incidence and causes of new-onset, acute postoperative vertigo following CI surgery using cone beam computed tomography (CBCT). Materials and methods: This is a retrospective study involving ten patients who experienced postoperative dizziness and ten matched controls without dizziness. All patients received a cochlear implant (CI) between 2020 and 2024. The matching analysis was performed based on the implant, electrode array, and access to the cochlear. We analyzed the postoperative CBCT scans for changes suspicious of air trapping, a so-called pneumolabyrinth in the vestibule using minimal Hounsfield Units (HU). Results: We compared postoperative CBCT images for electrode array position monitoring in ten patients with vertigo versus ten patients without vertigo after CI surgery. Among the ten patients with postoperative dizziness, six showed suspicious changes in the vestibule consistent with the presence of air. These air-related changes were observed in the vestibule and, in one patient, additionally in the horizontal semicircular canal. Minimal HU were significantly different and confirmed the suspicion of intravestibular air. Conclusion: This is the first study to describe the suspicion of intravestibular air in CI patients with postoperative vertigo. Therefore, suctioning after the fenestration of the round window membrane or the endosteum after cochleostomy, as well as actions such as bending, pressing, and nose-blowing by the patient, should be strictly avoided. Furthermore, this finding highlights the importance of carefully sealing the electrode array at the cochleostomy site with connective tissue. Risk factors for the development of a pneumolabyrinth with air in the vestibule include intralabyrinthine or intracranial pressure changes, large cochleostomies or a second cochleostomy and electrode placement in the scala tympani. [ABSTRACT FROM AUTHOR]

The mammalian auditory system develops a topographical representation of sound frequencies along its pathways, also called tonotopy. In contrast, sensory deprivation during early development results in no or only rudimentary tonotopic organization. This study addresses two questions: (1) How robust is the central tonotopy when hearing fails in adulthood? (2) What role does age play at time of deafness? To address these questions, we deafened young and old adult rats with previously normal hearing. One month after deafening, both groups were unilaterally supplied with cochlear implants and electrically stimulated for 2 h. The central auditory neurons, which were activated as a result of the local electrical intracochlear stimulation, were visualized using Fos staining. While the auditory system of young rats lost the tonotopic organization throughout the brainstem, the auditory system of the older rats mainly sustained its tonotopy. It can be proposed that plasticity prevails in the central auditory system of young adult rats, while network stability prevails in the brains of aging rats. Consequently, age may be an important factor in protecting a hearing-experienced adult auditory system from a rapid loss of tonotopy when suffering from acute hearing loss. Furthermore, the study provides compelling evidence that acute deafness in young adult patients should be diagnosed as early as possible to prevent maladaptation of the central auditory system and thus achieve the optimal hearing outcome with a hearing prosthesis. [ABSTRACT FROM AUTHOR]

Objectives: Multiple studies have described the onset and variable incidence of postoperative acute vertigo following cochlear implant (CI) surgery. However, postoperative imaging has not yet been specifically evaluated with special focus on vertigo. The aim of this study is to assess the incidence and causes of new-onset, acute postoperative vertigo following CI surgery using cone beam computed tomography (CBCT)., Materials and Methods: This is a retrospective study involving ten patients who experienced postoperative dizziness and ten matched controls without dizziness. All patients received a cochlear implant (CI) between 2020 and 2024. The matching analysis was performed based on the implant, electrode array, and access to the cochlear. We analyzed the postoperative CBCT scans for changes suspicious of air trapping, a so-called pneumolabyrinth in the vestibule using minimal Hounsfield Units (HU)., Results: We compared postoperative CBCT images for electrode array position monitoring in ten patients with vertigo versus ten patients without vertigo after CI surgery. Among the ten patients with postoperative dizziness, six showed suspicious changes in the vestibule consistent with the presence of air. These air-related changes were observed in the vestibule and, in one patient, additionally in the horizontal semicircular canal. Minimal HU were significantly different and confirmed the suspicion of intravestibular air., Conclusion: This is the first study to describe the suspicion of intravestibular air in CI patients with postoperative vertigo. Therefore, suctioning after the fenestration of the round window membrane or the endosteum after cochleostomy, as well as actions such as bending, pressing, and nose-blowing by the patient, should be strictly avoided. Furthermore, this finding highlights the importance of carefully sealing the electrode array at the cochleostomy site with connective tissue. Risk factors for the development of a pneumolabyrinth with air in the vestibule include intralabyrinthine or intracranial pressure changes, large cochleostomies or a second cochleostomy and electrode placement in the scala tympani., Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest., (Copyright © 2024 Ketterer, Everad, Lützen, Rauch, Aschendorff, Arndt and Jakob.)

Single-sided deafness (SSD) is characterised by deafness in one ear while the other ear has normal hearing. The most common cause in congenital SSD is aplasia of the auditory nerve, and in post-lingual SSD idiopathic hearing loss. Patients with SSD mainly suffer from impaired sound localisation and difficulties in speech perception in noise. There are various therapy options, but binaural hearing is only possible with a cochlear implant (CI)., Competing Interests: Die Autorinnen/Autoren geben an, dass kein Interessenkonflikt besteht., (Thieme. All rights reserved.)

Competing Interests: Die Autoren geben an, dass kein Interessenkonflikt besteht.

Competing Interests: Die Autoren geben an, dass kein Interessenkonflikt besteht.

Competing Interests: Die Autoren geben an, dass kein Interessenkonflikt besteht.

Competing Interests: I. Speck, T. F. Jakob und A.-K. Rauch geben an, dass kein Interessenskonflikt besteht.A. Aschendorff gibt Folgendes an: Fa. Advanced Bionics AG, Stäfa, Schweiz: Reisekostenerstattung, finanzielle Unterstützung für Forschung, Medical advisory board; Fa. Cochlear Ltd, Lane Cove, Australien: finanzielle Unterstützung für Forschung, Reisekostenerstattung; Fa. MED-EL Elektromedizinische Geräte Gesellschaft m.b.H., Innsbruck, Österreich: finanzielle Unterstützung für Forschung, Reisekostenerstattung; Fa. Oticon Medical A/S, Smørum, Dänemark: Reisekostenerstattung, finanzielle Unterstützung für Forschung.S. Arndt gibt Folgendes an: Fa. Advanced Bionics AG, Stäfa, Schweiz: Reisekostenerstattung; Fa. Cochlear Ltd, Lane Cove, Australien: finanzielle Unterstützung für Forschung, Reisekostenerstattung; Fa. MED-EL Elektromedizinische Geräte Gesellschaft m.b.H., Innsbruck, Österreich: finanzielle Unterstützung für Forschung, Reisekostenerstattung; Fa. Oticon Medical A/S, Smørum, Dänemark: Reisekostenerstattung.

Competing Interests: Interessenkonflikt: Die Autoren geben an, dass kein Interessenkonflikt besteht.