未经评估:这项研究的目的是观察三维(3D;水平,垂直,和扭转)与后半规管管结石(PSC-can)相关的良性阵发性位置性眩晕(BPPV)患者的眼震特征,并探讨其与Ewald的相关性。
未经评估:总之,纳入84例PSC-can患者。延迟,持续时间,方向,使用3D视频眼震描记术(3D-VNG)记录了Dix-Hallpike试验在悬挂和坐姿中引起的慢相速度。横向的特点,垂直,并对眼球震颤的扭转成分进行了定量分析。
UNASSIGNED:3D-VNG表明,由Dix-Hallpike测试的头悬位置引起的左右耳PSC-can的垂直分量和扭转分量的快速相位向上,顺时针和逆时针,水平分量主要为对侧。三个分量连续5s的慢相速度中值为26.3°/s(12.3-45.8),25.0°/s(15.7-38.9),和9.2°/s(4.9-13.7)。当病人回到坐姿时,眼球震颤的垂直和扭转分量的快速阶段被逆转。只有54名患者有眼球震颤的水平成分,他们中的32人仍然在同一个方向。三个分量连续5s的慢相速度中值为9.4°/s(6.0-11.7),6.8°/s(4.5-11.8),和4.9°/s(2.8-8.0)。水平慢相速度的比率,垂直,和扭转分量悬头位置坐位接近1.85(1.0-6.6),3.7(1.9-6.6),和5.1(2.6-11.3)。垂直分量与水平分量的慢相速度之比,扭转到水平分量,垂头位置的垂直扭转分量接近3.3(1.7-7.6),3.9(1.8-7.6),和1.0(0.5-1.8)。垂直分量与水平分量的慢相速度之比,扭转到水平分量,坐姿的垂直扭转分量接近2.1(1.1-6.8),1.5(1.0-3.8),和1.2(0.8-2.8)。
UNASSIGNED:在PSC-can患者中,Dix-Hallpike试验诱导的眼球震颤有三种成分。垂直分量最强,水平分量最弱。眼球震颤的3D特征与与单因素刺激相同PSC相关的生理性眼球震颤的3D特征一致,根据埃瓦尔德的法律。
UNASSIGNED: The aim of this study was to observe the 3-dimensional (3D; horizontal, vertical, and torsional) characteristics of nystagmus in patients with posterior semicircular canal canalithiasis (PSC-can)-related benign paroxysmal positional vertigo (BPPV) and investigate its correlation with Ewald\'s.
UNASSIGNED: In all, 84 patients with PSC-can were enrolled. The latency, duration, direction, and slow-phase velocity induced by the Dix-Hallpike test in the head-hanging and sitting positions were recorded using 3D video nystagmography (3D-VNG). The characteristics of the horizontal, vertical, and torsional components of nystagmus were quantitatively analyzed.
UNASSIGNED: 3D-VNG showed that the fast phase of the vertical components and torsional components of left and right ear PSC-can as induced by the head-hanging position of the Dix-Hallpike test were upward, clockwise and counterclockwise, and horizontal components were mainly contralateral. The median slow-phase velocity of each of the three components for consecutive 5 s was 26.3°/s (12.3-45.8), 25.0°/s (15.7-38.9), and 9.2°/s (4.9-13.7). When patients were returned to the sitting position, the fast phase of the vertical and torsional components of nystagmus was reversed. Only 54 patients had horizontal components of nystagmus, and 32 of them remained in the same direction. The median slow-phase velocity of the three components for consecutive 5 s was 9.4°/s (6.0-11.7), 6.8°/s (4.5-11.8), and 4.9°/s (2.8-8.0). The ratios of the slow-phase velocity of the horizontal, vertical, and torsional components of the head-hanging position to the sitting position were close to 1.85 (1.0-6.6), 3.7 (1.9-6.6), and 5.1 (2.6-11.3). The ratios of the slow-phase velocity of the vertical to horizontal component, the torsional to horizontal component, and the vertical to torsional component of the head-hanging position were close to 3.3 (1.7-7.6), 3.9 (1.8-7.6), and 1.0 (0.5-1.8). The ratios of the slow-phase velocity of the vertical to horizontal component, the torsional to horizontal component, and the vertical to torsional component of the sitting position were close to 2.1 (1.1-6.8), 1.5 (1.0-3.8), and 1.2 (0.8-2.8).
UNASSIGNED: There were three components of nystagmus induced by the Dix-Hallpike test in patients with PSC-can. The vertical component was the strongest and the horizontal component was the weakest. The 3D characteristics of nystagmus were consistent with those of physiological nystagmus associated with the same PSC with a single-factor stimulus, in accordance with Ewald\'s law.