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일측성 청각소실 환자에서 시행한 기능적 자기공명영상 소견

Other Titles
 Auditory Functional MRI Findings in Patients with Unilateral Hearing Loss 
Authors
 김시연  ;  김동익  ;  최재영  ;  이호기  ;  이원상  ;  정명현  ;  김희남 
Citation
 Korean Journal of Otolaryngology (대한이비인후과학회지), Vol.47(5) : 419-425, 2004 
Journal Title
Korean Journal of Otolaryngology(대한이비인후과학회지)
ISSN
 1225-035X 
Issue Date
2004
Keywords
Auditory cortex ; Functional MRI ; Hearing loss ; Neuronal plasticity
Abstract
Background and Objectives:Auditory pathway is a unique sensory system in that its ascending pathway has both contralateral and ipsilateral projection to auditory cortex. It has been known that monaural auditory stimulation with auditory functional MRI (fMRI) in normal hearing subject produces bilateral auditory cortical activation, slightly lateralized to opposite side. Our goal was to assess the pattern of auditory cortical activation in patients with unilateral sensory neural hearing loss.

Subjects and Method:Auditory fMRI studies using a single-shot gradient-recalled echo-planar imaging (EPI) sequence were performed in eight normal volunteers, thirteen patients with unilateral hearing loss of acute onset (AO, <1 month) and eleven patients with unilateral hearing loss of long duration (LD, >3 months). A box-car design of 1,000-Hz sine tone stimuli was given to right or left ear of normal volunteer and to healthy ears of patients. The data were analyzed by BOLD Analysis package. The lateralization index (LI) between contralateral and ipsilateral hemispheric activation were obtained by calculating and comparing the number of activated pixels in each auditory hemisphere.

Results:In normal volunteers, the LI was 2.9-5.2 for monaural stimuli suggesting contralateralization of auditory cortex to monaural stimuli. The LI was increased for the AO (8.1-19.2) and decreased for the LD (0.8-1.2).

Conclusion:The auditory cortical activation in patients with unilateral sensory neural hearing loss showed different pattern according to the duration of hearing loss. The present results might suggest the time course of neuronal plasticity of auditory cortex after deterioration of input function of auditory ascending pathway.
Files in This Item:
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Appears in Collections:
1. College of Medicine (의과대학) > Dept. of Otorhinolaryngology (이비인후과학교실) > 1. Journal Papers
1. College of Medicine (의과대학) > Dept. of Radiology (영상의학교실) > 1. Journal Papers
Yonsei Authors
Kim, Dong Ik(김동익)
Kim, Si Yeon(김시연)
Kim, Hee Nam(김희남)
Lee, Won Sang(이원상)
Lee, Ho Ki(이호기)
Chung, Myung Hyun(정명현)
Choi, Jae Young(최재영) ORCID logo https://orcid.org/0000-0001-9493-3458
URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/112678
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