Positional nystagmus – is it BPPV? When it comes to assessing nystagmus during the Dix Hallpike maneuver, knowing how to interpret those patterns is key! Here’s your quick guide to confirming posterior canal BPPV: 🔎DIRECTION: Look for upward torsion toward the affected ear. ⏳ LATENCY: Notice the short delay before nystagmus kicks in. ⏰ TIME PATTERN: Watch for a brief burst following a crescendo-decrescendo rhythm. Check out how swiftly this nystagmus appeared and disappeared! This highlights th