Related Experiment Video
Updated: Feb 10, 2026
08:38
Testing of all Six Semicircular Canals with Video Head Impulse Test Systems
Published on: April 18, 2019
32.8K
Horizontal canal benign paroxysmal positional vertigo in a fighter pilot
Su-Jiang Xie1, Jiang-Chang Wang, Li Ding
1Department of Aerospace Biodynamics, Fourth Military Medical University, Xi'an, Shaanxi, China.
Journal of Neurosciences in Rural Practice
|July 1, 2011
Summary
Benign paroxysmal positional vertigo (BPPV), a common vestibular disorder, can involve the horizontal canal (HC-BPPV). This case study examines a naval pilot experiencing HC-BPPV and discusses aeromedical implications.
Area of Science:
- Vestibular system disorders
- Aerospace medicine
- Neurology
Background:
- Benign paroxysmal positional vertigo (BPPV) is the most frequent peripheral vestibular disorder, causing brief, intense vertigo triggered by head position changes.
- It is typically associated with canalithiasis in the posterior semicircular canal.
- Horizontal canal (HC)-BPPV, a less common variant, is increasingly recognized.
Observation:
- A case of horizontal canal BPPV (HC-BPPV) occurred in a naval fighter pilot while on the ground.
- This highlights that HC-BPPV can affect individuals in demanding professions.
Findings:
- The study details a specific incident of HC-BPPV in a pilot.
- It underscores the occurrence of HC-BPPV even in non-flight scenarios.
Implications:
- Aeromedical evaluations and considerations are crucial for pilots diagnosed with HC-BPPV.
- Understanding HC-BPPV is important for maintaining aviation safety and pilot fitness.
Related Concept Videos
01:27Horizontal Gene Transfer
2.3K
Horizontal gene transfer (HGT) is a process where genetic material moves between organisms within the same generation, unlike vertical gene transfer, which occurs from parent to offspring. HGT plays a crucial role in microbial evolution, adaptation, and survival, particularly in shared environments like the human gut.Mobile genetic elements such as plasmids, prophages, integrons, insertion sequences, and transposons facilitate this process. HGT occurs through three primary mechanisms:...
2.3K
01:03Horizontal Curve: Problem Solving
417
A horizontal curve is characterized by its radius, intersection angle, and stationing of key points. In this case, the radius is 400 meters, and the angle of intersection is 30 degrees, with the station of the point of curvature (P.C.) at 0 + 150 meters. The goal is to determine the station values at the point of intersection (P.I.), point of tangency (P.T.), and midpoint of the curve, as well as the length of the long chord.The process begins with calculating the tangent distance (T) and the...
417
01:19Introduction to Horizontal Curves
742
Horizontal curves are essential in highway and railroad design, ensuring smooth and safe transitions between straight path segments, or tangents. These curves allow vehicles to maintain speed without abrupt changes, minimizing accidents and improving travel efficiency.A horizontal curve is typically defined by its geometric relationship to two tangents that meet at an intersection point (P.I.), where a simple curve is introduced to connect them. The back tangent refers to the initial tangent...
742
01:21Pilot and Numeric Relaying
492
Pilot relaying is a type of differential protection used in power systems. It compares electrical quantities at the terminals of equipment via a communication channel instead of direct relay interconnection. This method is essential for transmission lines where the terminals are far apart, typically up to 80 km for lines with 69 to 115 kV ratings. Four types of communication channels are used for pilot relaying:
492
01:16Shear on the Horizontal Face of a Beam Element
531
To understand shear on the flat side of a prismatic beam element, consider the vertical and horizontal shearing forces, and the normal forces, acting on the element. The element's upper (U) and lower (L) sections, which are divided by the beam's neutral axis, are examined. The equilibrium of these forces is determined by applying the equilibrium equation, which helps identify the horizontal shearing force. This force is directly related to the bending moments and the cross-section's...
531
02:32Position-effect Variegation
7.1K
In 1928, a German botanist Emil Heitz observed the moss nuclei with a DNA binding dye. He observed that while some chromatin regions decondense and spread out in the interphase nucleus, others do not. He termed them euchromatin and heterochromatin, respectively. He proposed that the heterochromatin regions reflect a functionally inactive state of the genome. It was later confirmed that heterochromatin is transcriptionally repressed, and euchromatin is transcriptionally active chromatin.
7.1K