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J Korean Bal Soc > Volume 7(2); 2008 > Article
Journal of the Korean Balance Society 2008;7(2): 188-192.
Dix-Hallpike 검사에 대한 수학적 고찰
변성완
이화여자대학교 의학전문대학원 이비인후과학교실
A Mathematical Consideration on the Dix-Hallpike maneuver
Sung Wan Byun
Department of Otolaryngology, School of Medicine, Ewha Womans University, Seoul, Korea. byunsw@ewha.ac.kr
ABSTRACT
Background and Objectives:   At the beginning of the Dix-Hallpike maneuver, one of the two functional pair planes of the vertical canals is presumed to lie in the sagittal plane. However, this presumption is not correct. This paper aims to describe this problem more clearly and speculate on clinical implications. Mathematical and theoretical reasoning will be discussed.
Materials and Methods:  
Two sets, each composed of three perpendicular planes, were modeled for simplified semicircular canals in the anatomical position with a 3D modeler. After a yaw rotation of 45°, the surface normal of the vertical canal plane is compared with that of the true sagittal plane.
Results:  
The angle between the two normals was approximately 21.1 degrees. The theoretical vertical canal plane did not lie in the sagittal plane at the beginning position of Dix-Hallpike maneuver.
Conclusions:  
More exact Dix-Hallpike maneuvers may require a roll tilting about 20° toward the affected side. Key words: Benign paroxysmal positional vertigo, Dix-Hallpike maneuver, Semicircular canals
Keywords: Benign paroxysmal positional vertigo; Dix-Hallpike maneuver; Semicircular canals
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