BPPV is commonly caused by dysfunction involving posterior semicircular canal. On rare occasions superior and lateral canals too can be involved
Explanation
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This disorder was first described by Barany in 1921. He documented the various components of this disorder as 1. Nystagmus, 2. Fatiguability of the nystagmus and 3. Vertigo. He failed to correlate the onset of nystagmus with specific positions of the head.
Dix & Hallpike 1952 described the Dix Hallpike maneuver for eliciting the nystagmus. They also described the unique features of nystagmus accompanying this disorder. These features were 1. Very short latency, 2. Directional features, 3. Brief duration, and 4. Reversibility on returning the patient to a seated position.
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