Analysis of Vertical Semicircular Canal Rotational Test in Healthy Adults.
- Author:
Gyu Cheol HAN
1
Author Information
1. Department of Otolaryngology-Head and Neck Surgery, Gil Hospital, Gachon Medical School, Inchon, Korea.
- Publication Type:Original Article
- Keywords:
Vertical semicircular canal;
Rotational test
- MeSH:
Adult*;
Electronystagmography;
Eyeglasses;
Glass;
Head;
Humans;
Nystagmus, Pathologic;
Semicircular Canals*;
Supine Position;
Vestibular Function Tests
- From:Korean Journal of Otolaryngology - Head and Neck Surgery
2000;43(5):482-487
- CountryRepublic of Korea
- Language:Korean
-
Abstract:
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 romputerized 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.
