Natural course of positional vertigo in patients with apogeotropic variant of horizontal canal benign paroxysmal positional vertigo

Diagnosis of the subtype and affected ear of benign paroxysmal positional vertigo using a questionnaire

“…After that, we examined their positional and positioning nystagmus and recorded the nystagmus with an infrared CCD camera (RealEyes, Micromedical Technologies). By checking a recorded movie of the nystagmus several times or using our own three-dimensional eye movement analysis system [7], we confirmed the subtype and affected ear of BPPV [8][9][10][11][12][13]. We decided the affected ear as that on the side of the Dix-Hallpike maneuver that induced torsional and upbeat positioning nystagmus in patients with P-BPPV, as the rotated side in the supine position that induced stronger nystagmus in patients with GH-BPPV, and as the rotated side in the supine position that induced weaker nystagmus in patients with AH-BPPV [13].…”

Correlation between the head‐lying side during sleep and the affected side by benign paroxysmal positional vertigo involving the posterior or horizontal semicircular canal

“…However, most of the previous reports dealing with head‐lying side and the side affected by BPPV have only included p‐BPPV cases without analyzing h‐BPPV cases. Because spontaneous resolution is known to occur much more rapidly in h‐BPPV than p‐BPPV, it is possible that many of the h‐BPPV cases could have been missed in previous studies that were mostly performed in tertiary hospitals 9, 10. A recent study has consistently shown that the incidence of h‐BPPV was significantly higher in patients who had shorter duration of symptoms 11.…”

Benign Paroxysmal Positional Vertigo in the Acute Care Setting

“…About 90% of cases of apogeotropic horizontal canal BPPV resolved in 1 study within 1 week and all had resolved by 4 weeks in several studies. 54,56 Anterior Canal Benign Paroxysmal Positional Vertigo…”

“…BPPV affecting the anterior canal is characterized by brief downbeating nystagmus with only a minor rotational component after Dix Hallpike positioning, no matter to which side the head is turned to (see Table 1). 23,25,44,[56][57][58] Thus, the side of the diagnostic positioning maneuver is not helpful to reveal the side of the affected anterior canal. Theoretically, the affected side can be deduced from the torsional component of nystagmus, but this component can be fairly subtle in many cases, making it difficult to lateralize reliably without more sophisticated 3-dimensional eye movement recordings.…”