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KMID : 0361020000430050482
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Korean Journal of Otolaryngology - Head and Neck Surgery
2000 Volume.43 No. 5 p.482 ~ p.487
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Analysis of Vertical Semicircular Canal Rotational Test in Healthy Adult
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Han Gyu-Cheol
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Abstract
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Background and Objectives : Vestibular function tests of the semicircular canal (SCC)
are limited to horizontal SCC since stimulating a vertical SCC is difficult. The purpose
of this study is to develop a vestibular function test of vertical SCC and analyze its
function in healthy adults.
Material and Methods : Thirty healthy adults were placed down in supine position on a
rotating table with their heads turned 45 degrees to left or 45 degrees to right side. The
table was rotated in a sinusoidal rotational mode at 0.05 Hz and 0.1 Hz frequency.
Nystagmus was observed through a videooculographic device or Frenzel glasses and
recorded with a computerized electronystagmography. An analysis was made on the
vertical nystagmus.
Results : Rotatory nystagmus was observed : the slow component of eye velocity and
the gain were increased at a higher frequency while the phase was decreased at higher
frequency(p＜0.05). Gain, phase and directional preponderance did not show any
significant difference at each head position.
Conclusion : Resulting nystagmus from the rotating chair stimulation on a vertical SCC
has been analyzed. The test can be utilized to analyze the function of a vertical SCC as
a positional/positioning test, a head impulse or self rotation test
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KEYWORD
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Vertical semicircular canal, Rotational test
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