Classic Findings During Hallpike Test in Posterior Canal Benign Paroxysmal Positional Vertigo (BPPV)
• Latency (delay in nystagmus and vertigo once in head-hanging position) of approximately 3 to 10 seconds, although delay can take up to 30 seconds on rare occasions
• Reproduction of vertigo symptoms in head-hanging position
• Upbeat (fast phase toward forehead) and torsional nystagmus (usually toward the downward ear)
• Vertigo and nystagmus escalates in head-hanging position, then slowly resolves over 5 to 30 seconds
• Nystagmus and vertigo may reverse direction when patient returns to sitting position
• Nystagmus and vertigo decrease with repeated testing (fatigability)
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