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KMID : 0860720000040000487
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Annual Bulletin of The Bum-Suk Academic Scholarship Foundation
2000 Volume.4 No. 0 p.487 ~ p.496
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Monothermal Caloric Test on Central Vertigo
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Abstract
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In 1970, Torok reported that patients with labyrinthine disease showed vestibular recruitment and that patients with retrolabyrinthine disease showed vestibular decruitment on the monothermal caloric test. The monothermal caloric test screening test, when used appropriately, is known a sensitive and cost-effective adjunct to the vestibular test battery. Following Torok´s procedure exactly, the monothermal caloric test was administered to 60 normal individuals and 12 patients with definite pathology of central nervous system.
The results were obtained as follows :
Ⅰ. In the control group
1. Culmination frequency values of the weak caloric test were as low 2 beats/lOseconds and as high as 32 beats/lOseconds at the peak of the reaction and that of strong caloric test is spread between 6 in one ear to 48.
2. Ratio was 1.0 to 4.4 (average 2.1, standard deviation 0.7). So we obtained normal ranges of 1.2 to 3.2 according to Torok´s method.
Ⅱ. In the group with central pathology
1. Normal ratio was seen in 1 case(8.3%), decruitment in 11 cases(91.7%) bilateral 6 cases & unilateral 5 cases)and recruitment in 0 cases.
2. Decruitment-type ratios were observed. Type I decruitment was seen in 6 ears . Type II decruitment l lears : type III decruitment. 0 ear.
We suggest that the monothermal caloric test was helpful method to diagnosis of central pathology with vertigo. But we have more to study about directional correlation between CNS pathology and decruitment.
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KEYWORD
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