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정상 성인에서 전정기능검사에 대한 정량적 분석: 냉온교대안진검사 및 정현파회전안진검사
Published Online: May 31, 2020
ABSTRACT
The maintenance of body equilibrium and posture depends on information from vestibular system, vision, proprioceptive system and other sensory organs. These informations are integrated in the central nervous system and relay on the eye muscles through vestibulo- ocular reflex, postural muscles through vestibulo-spinal reflex. Quantitative analysis of vestibular function has been extensively evaluated on the vestibulo-ocular reflex beause it is the easiest reflex to stimulate and record. The caloric test by Fitzgerald-Hallpike method using 250ml amount of water, 30°C cold, 44°C warm and rotation test by sinusoidal rotation stimuli using frequency of 0.05, 0.1, 0.2Hz. were performed to evaluate the vestibular function in 23 adults.
The obtained results were as follows:
Vestibulo-ocular reflex induced by bithermal caloric stimuli was quantified in values of maximum velocity of slow component, amplitude, canal paresis and directional preponderance. Maximum velocity of slow component was 26.4±2.3~28.9±1.4°/sec(Mean±SE), maximum amplitude was 7·6±0.7 ~ 8.7±0.9°. Also, canal paresis was 6.1±1·2% and directional preponderance was 4.9±1.4% within normal range.
The direction of nystagmus induced by sinusoidal rotation stimuli was the same to the direction of rotation and the velocity of nystagmus was proportioned to the velocity of rotation. Gain, phase difference and directional preponderance were calculated. Gain was 0.62±0.02 at frequency of 0.05Hz, 0.6410.03 at 0.1Hz, 0.59±0.01 at 0.2Hz and phase difference was 28.5± 0.7° at 0.05Hz, 19.1±0.8° at 0.1Hz, 12.2±0.5° at 0.2Hz, directional preponderance was 3.0, 0.4~5.5±1.2%.