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Research in Vestibular Science > Volume 13(2); 2014 > Article
Research in Vestibular Science 2014;13(2): 41-46.
급성기 일측성 전정신경염 환자에서의 고주파수 고가속도
이환서, 박준우, 이창욱, 송찬일, 유명훈, 박홍주
울산대학교 의과대학 서울아산병원 이비인후과학교실
Results of High-Frequency and High-Acceleration Rotary Chair Test in Patients with Acute Unilateral Vestibular Neuritis
Hwan Seo Lee, Jun Woo Park, Chang Wook Lee, Chan Il Song, Myung Hoon Yoo, Hong Ju Park
Department of Otolaryngology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea. dzness@amc.seoul.kr
ABSTRACT
r neuritis.
Materials and Methods:  
Twenty-four patients who were diagnosed as acute vestibular neuritis and underwent rotational chair and caloric tests during March 2012 to March 2013 were included. Slow harmonic acceleration (SHA) test was performed at 0.01, 0.04, 0.16, 0.64, 1.28, and 2.00 Hz. Step velocity tests at the peak velocity of 100o/sec (low-acceleration) and 240o/sec (high-acceleration) were performed. Gains and phases in SHA test and gains and time constants (Tc) in step velocity test were analyzed.
Results:  
In SHA test, decreased gain and phase lead was observed mostly in low frequencies. Gains (phases) at 0.01, 0.04, 0.16, 0.64, 1.28, and 2.00 Hz were 0.2±0.1 (62.2±15.4), 0.3±0.2 (24.5±13.0), 0.4±0.2 (7.2±18.8), 0.5±0.1 (7.2±11.3), 0.7±0.2 (11.0±7.5), and 0.8±0.3 (4.4±14.4), respectively. In step velocity (SV) test, gains stimulating the lesion side were significantly lower than those stimulating the intact side in both low- and high-acceleration SV test (p<0.05) and per-rotatory gain stimulating the lesion side in high-acceleration SV test was significantly lower than that in low-acceleration SV test. Tc stimulating the lesion side were significantly shorter than those stimulating the intact side in low- acceleration SV test (p<0.05) but not in high-acceleration SV test. Per- and post-rotatory Tc in high-acceleration SV test stimulating the intact side was significantly lower than those in low-acceleration SV test (p<0.05).
Conclusion:  
At high-frequency SHA test, gain was pretty normal and phase lead was observed in some patients. High-acceleration SV test showed shortened Tc regardless of the sides, suggesting that high-acceleration SV test can reveal the impaired velocity storage system in patients with vestibular neuritis more frequently than low-acceleration SV test.
Keywords: High-acceleration; Rotary chair test; Vestibular neuronitis; Caloric tests
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