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TitleDescriptionSubject
1 Pseudo-Spontaneous Nystagmus and Bow and Lean Test in Horizontal Canal BPPVThis is a 70-year-old woman presenting to the Emergency Department with positional vertigo that was determined to be due to the apogeotropic variant of right horizontal canal (HC) benign paroxysmal positional vertigo (BPPV). When her head is in a neutral position with the head in axis with the trunk...Benign Paroxysmal Positional Vertigo; BPPV; Horizontal Canal; Jerk Nystagmus; Vestibular Nystagmus; Head Shaking
2 Relationship Between Semicircular Canals and Extraocular MusclesFigure 1: When stimulated, each of the 6 angular acceleration detecting semicircular canals (3 on the right and 3 on the left) responds with a conjugate eye movement, with the vector(s) indicated below. PC=posterior canal; HC=horizontal (also known as lateral) canal; AC=anterior (also known as super...Extraocular Muscles
3 The Geotropic Variant of Horizontal Canal BPPVThis is a patient with the geotropic (nystagmus beating towards the ground) variant of left horizontal canal (HC) benign paroxysmal positional vertigo (BPPV). In a patient with geotropic (nystagmus beating towards the ground) HC BPPV, by rapidly moving from a sitting to a supine position with the he...BPPV Horizontal; BPPV Diagnosis; Jerk Nystagmus; Vestibular Nystagmus
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