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Results of High-Frequency and High-Acceleration Rotary Chair Test in Patients with Acute Unilateral Vestibular Neuritis
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Hwan Seo Lee, Jun Woo Park, Chang Wook Lee, Chan Il Song, Myung Hoon Yoo, Hong Ju Park
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Res Vestib Sci. 2014;13(2):41-46.
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 Abstract
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- 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.
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Management of Benign Paroxysmal Positional Vertigo
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Chan Il Song, Hong Ju Park
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Res Vestib Sci. 2013;12(4):111-120.
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Abstract
- Benign paroxysmal positional vertigo (BPPV) is characterized by brief recurrent episodes of vertigo triggered by head positional changes. BPPV is one of the most common causes of recurrent vertigo. BPPV results from abnormal stimulation of the cupula within any of the three semicircular canals by free-floating otoliths (canalithiasis) or otoliths adhered to the cupula (cupulolithiasis). Spontaneous recovery occurs frequently even with conservative treatment. However, canalith repositioning maneuvers are believed to be the best way to treat BPPV by moving the canaliths from the semicircular canal to the vestibule. Various treatment methods of posterior, superior, and lateral canal BPPV are discussed in this review.
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