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KMID : 1195620210140010069
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Clinical and Experimental Otorhinolaryngology
2021 Volume.14 No. 1 p.69 ~ p.75
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Changes in Vestibular Symptoms and Function After Cochlear Implantation: Relevant Factors and Correlations With Residual Hearing
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Jang Jeong-Hun
Kim Han-Tai
Choo Oak-Sung
Park Hun-Yi
Choung Yun-Hoon
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Abstract
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Objectives: The aim of this study was to evaluate vestibular function loss after cochlear implantation (CI) and the relationship between vestibular function and hearing changes.
Methods: Seventy-five patients with CI were enrolled and divided into those with normal preoperative caloric function (group I) and those with a normal preoperative waveform in cervical vestibular evoked myogenic potential (c-VEMP) testing (group II). The relationship between hearing and changes in the vestibular system was analyzed preoperatively and at 3 and 6 months postoperatively.
Results: In group I, unilateral weakness on the implanted side was detected in five (7.7%) and eight (12.3%) patients at 3 and 6 months post-CI, respectively. By 3 months post-CI, the total slow-phase velocity (SPV; warm and cold stimulations) was significantly different between the implanted and non-implanted sides (P=0.011), and the shift in total SPV from pre- to post-CI was significantly correlated with the average hearing threshold at 6 months post-CI. In group II, an abnormal c-VEMP was detected on the implanted side in six patients (16.2%) at 3 months post-CI, and in six patients (16.2%) at 6 months post-CI. Significant changes were noticed in the P1 and N1 amplitude at 3 months postCI (P=0.027 and P=0.019, respectively).
Conclusion: Vestibular function and residual hearing function should be afforded equal and simultaneous consideration in terms of preservation.
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KEYWORD
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Cochlear Implantation, Vestibular Function Tests, Vertigo, Caloric Tests, Vestibular Evoked Myogenic Potential
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