Monaural 40-Hz auditory steady-state magnetic responses can be useful for identifying epileptic focus in mesial temporal lobe epilepsy

Teppei Matsubara, Katsuya Ogata, Naruhito Hironaga, Taira Uehara, Takako Mitsudo, Hiroshi Shigeto, Toshihiko Maekawa, Shozo Tobimatsu

研究成果: Contribution to journalArticle

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Objective: Patients with mesial temporal lobe epilepsy (mTLE) often exhibit central auditory processing (CAP) dysfunction. Monaural 40-Hz auditory steady-state magnetic responses (ASSRs) were recorded to explore the pathophysiology of mTLE. Methods: Eighteen left mTLE patients, 11 right mTLE patients and 16 healthy controls (HCs) were examined. Monaural clicks were presented at a rate of 40 Hz. Phase-locking factor (PLF) and power values were analyzed within bilateral Heschl's gyri. Results: Monaural 40-Hz ASSR demonstrated temporal frequency dynamics in both PLF and power data. Symmetrical hemispheric contralaterality was revealed in HCs. However, predominant contralaterality was absent in mTLE patients. Specifically, right mTLE patients exhibited a lack of contralaterality in response to left ear but not right ear stimulation, and vice versa in left mTLE patients. Conclusion: This is the first study to use monaural 40-Hz ASSR with unilateral mTLE patients to clarify the relationship between CAP and epileptic focus. CAP dysfunction was characterized by a lack of contralaterality corresponding to epileptic focus. Significance: Monaural 40-Hz ASSR can provide useful information for localizing epileptic focus in mTLE patients.

元の言語英語
ページ(範囲)341-351
ページ数11
ジャーナルClinical Neurophysiology
130
発行部数3
DOI
出版物ステータス出版済み - 3 2019

All Science Journal Classification (ASJC) codes

  • Sensory Systems
  • Neurology
  • Clinical Neurology
  • Physiology (medical)

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