caa a22 4500 606216642 CHVBK 20210128101104.0 cr unu---uuuuu 210128e20150201xx s 000 0 eng 10.1007/s00701-014-2301-8 doi (NATIONALLICENCE)springer-10.1007/s00701-014-2301-8 Cerebellar retraction and hearing loss after microvascular decompression for hemifacial spasm [Elektronische Daten] [Min Lee, Hyun Lee, Tae Jee, Kyung Jo, Doo-Sik Kong, Jeong Lee, Kwan Park] Background: This retrospective study evaluated the length of cerebellar retraction and the changes of intraoperative brainstem auditory evoked potential (BAEP) during microvascular decompression (MVD), and assessed the predictive value of the hearing loss as a prognostic indicator for the treatment outcome of hemifacial spasm (HFS). Methods: This series included 1,518 consecutive patients affected with HFS who underwent MVD, during which BAEP was monitored. Patients were divided into two groups based on whether hearing loss occurred following decompression or not. Each patient underwent a similar procedure performed by one neurosurgeon. The two patients groups were matched with regard to sex, age, and degree of spasm. Results: Among the 1,518 patients, 106 (6.98%) displayed functional hearing changes. Hearing loss was permanent in 12 patients (0.79%). Of the 1,412 patients with stationary hearing compared with preoperative audiometry, 96 patients were selected who were individually matched with respect to sex, age, and degree of spasm. BAEP changed immediately after cerebellar retraction in 7 of 12 hearing-loss patients, suggesting the importance of retraction on hearing outcomes. The distance from the cerebellar surface of the petrous temporal bone to the neurovascular compression point was measured. The median distance of cerebellar retraction in the hearing-loss group was 13.77mm, which was longer than the median distance in the control group. Conclusions: Preoperative measurement of the cerebellar retraction distance can be a valuable clue to predict and prevent postoperative hearing loss in MVD for HFS. Springer-Verlag Wien, 2014 Hearing loss nationallicence Microvascular decompression nationallicence Hemifacial spasm nationallicence Cerebellar retraction nationallicence Lee Min Department of Neurosurgery, Samsung Medical Center, School of Medicine, Sungkyunkwan University, 81 Irwon-ro, 135-710, Gangnam-gu, Seoul, Korea aut Lee Hyun Department of Neurosurgery, Samsung Medical Center, School of Medicine, Sungkyunkwan University, 81 Irwon-ro, 135-710, Gangnam-gu, Seoul, Korea aut Jee Tae Department of Neurosurgery, Samsung Medical Center, School of Medicine, Sungkyunkwan University, 81 Irwon-ro, 135-710, Gangnam-gu, Seoul, Korea aut Jo Kyung Department of Neurosurgery, Samsung Medical Center, School of Medicine, Sungkyunkwan University, 81 Irwon-ro, 135-710, Gangnam-gu, Seoul, Korea aut Kong Doo-Sik Department of Neurosurgery, Samsung Medical Center, School of Medicine, Sungkyunkwan University, 81 Irwon-ro, 135-710, Gangnam-gu, Seoul, Korea aut Lee Jeong Department of Neurosurgery, Samsung Medical Center, School of Medicine, Sungkyunkwan University, 81 Irwon-ro, 135-710, Gangnam-gu, Seoul, Korea aut Park Kwan Department of Neurosurgery, Samsung Medical Center, School of Medicine, Sungkyunkwan University, 81 Irwon-ro, 135-710, Gangnam-gu, Seoul, Korea aut Acta Neurochirurgica Springer Vienna 157/2(2015-02-01), 337-343 0001-6268 157:2<337 2015 157 701 https://doi.org/10.1007/s00701-014-2301-8 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00701-014-2301-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Lee Min Department of Neurosurgery, Samsung Medical Center, School of Medicine, Sungkyunkwan University, 81 Irwon-ro, 135-710, Gangnam-gu, Seoul, Korea aut NATIONALLICENCE 700 1- Lee Hyun Department of Neurosurgery, Samsung Medical Center, School of Medicine, Sungkyunkwan University, 81 Irwon-ro, 135-710, Gangnam-gu, Seoul, Korea aut NATIONALLICENCE 700 1- Jee Tae Department of Neurosurgery, Samsung Medical Center, School of Medicine, Sungkyunkwan University, 81 Irwon-ro, 135-710, Gangnam-gu, Seoul, Korea aut NATIONALLICENCE 700 1- Jo Kyung Department of Neurosurgery, Samsung Medical Center, School of Medicine, Sungkyunkwan University, 81 Irwon-ro, 135-710, Gangnam-gu, Seoul, Korea aut NATIONALLICENCE 700 1- Kong Doo-Sik Department of Neurosurgery, Samsung Medical Center, School of Medicine, Sungkyunkwan University, 81 Irwon-ro, 135-710, Gangnam-gu, Seoul, Korea aut NATIONALLICENCE 700 1- Lee Jeong Department of Neurosurgery, Samsung Medical Center, School of Medicine, Sungkyunkwan University, 81 Irwon-ro, 135-710, Gangnam-gu, Seoul, Korea aut NATIONALLICENCE 700 1- Park Kwan Department of Neurosurgery, Samsung Medical Center, School of Medicine, Sungkyunkwan University, 81 Irwon-ro, 135-710, Gangnam-gu, Seoul, Korea aut NATIONALLICENCE 773 0- Acta Neurochirurgica Springer Vienna 157/2(2015-02-01), 337-343 0001-6268 157:2<337 2015 157 701