Systematic facial nerve monitoring in middle ear and mastoid surgeries: “Surgical dehiscence” and “electrical dehiscence” |
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| Authors: | Yun-Hoon Choung DDS MD PhD Keehyun Park MD PhD Min Jung Cho MD PhD Pill-Hoon Choung DDS PhD You Ree Shin MD PhD Hison Kahng MD |
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| Affiliation: | Department of Otolaryngology, Ajou University School of Medicine, Suwon, Korea. yhc@ajou.ac.kr |
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| Abstract: | OBJECTIVES: To evaluate and systemize intraoperative facial nerve monitoring (IOFNM) in middle ear and mastoid surgeries. STUDY DESIGN AND SETTING: A prospective study. METHODS: IOFNM was performed in 100 patients undergoing middle ear and mastoid surgeries. We checked "surgical dehiscence" under microscopes, and also estimated the minimal threshold of electric current needed to change the electromyography of facial muscles using Nerve Integrity Monitor (NIM)-2 (Xomed, Minneapolis, MN, USA). RESULTS: Forty-three percent of cases showed "surgical dehiscence" and responded to electric stimulation of 0.7 mA or less. "Electrical dehiscence" (
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