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Positional / BPPV
Left posterior canal BPPV (Dix-Hallpike)
Left posterior semicircular canal canalithiasis
Live animation
Fast-phase: ↑ upbeating vertical · ↺ left-torsional (CCW) · fatigable · latency 2.5s
Gaze directionprimary
← 40° LEFTPRIMARY40° RIGHT →
Slide to test Alexander's law (peripheral), gaze-evoked patterns, or the null zone (congenital).
Position-over-time tracing
Live strip-chart. Horizontal, vertical, and torsional channels.
In a sentence
Mirror of right-PC BPPV. Upbeating + left-torsional nystagmus on left Dix-Hallpike.
Clinical pearls
- ◆Provoked by Dix-Hallpike with head turned 45° to the LEFT.
- ◆Latency, fatigue, and crescendo–decrescendo profile identical to right side.
Common associations
- Idiopathic BPPV
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