Benign Paroxysmal Positional Vertigo: Canal Switching Affecting All Canals During a Single Session

Abstract

SDC Video Link: http://links.lww.com/MAO/B86.

Re: Benign Paroxysmal Positional Vertigo: Canal Switching Affecting All Canals During a Single Session

“…In the first two Dix-Hallpike (DH) maneuvers the torsional component was consistently to the right (affected) side regardless of the vertical component. As discussed in the video report (1), the spatial orientation of both superior canals (about 108 closer to the sagittal plane than the PC) increases the likelihood that SC-BPPV could be equally provoked in both the DH maneuver and the Head Hanging maneuver (2)(3)(4), again in the left SC BPPV the torsional component could be absent or beat to the left side instead of to the right. In right aPC BPPV the torsional component should beat to the left (rather than right), as in this case.…”

“…To the Editor: We read and watched with interest the video report "Benign paroxysmal positional vertigo (BPPV): canal switching (CS) affecting all canals during a single session" (1). The authors believed that they encountered a rare case of BPPV affecting sequentially all three canals in the right side including posterior canal (PC), superior canal (SC), and lateral canal (LC) due to CS during a single session.…”

Author Response: Re: Benign Paroxysmal Positional Vertigo: Canal Switching Affecting All Canals During a Single Session

“…In the first two Dix-Hallpike (DH) maneuvers the torsional component was consistently to the right (affected) side regardless of the vertical component. As discussed in the video report (1), the spatial orientation of both superior canals (about 108 closer to the sagittal plane than the PC) increases the likelihood that SC-BPPV could be equally provoked in both the DH maneuver and the Head Hanging maneuver (2–4), again in the left SC BPPV the torsional component could be absent or beat to the left side instead of to the right. In right aPC BPPV the torsional component should beat to the left (rather than right), as in this case.…”