Lying-down nystagmus and head-bending nystagmus in horizontal semicircular canal benign paroxysmal positional vertigo: are they useful for lateralization?

There was a highly significant coefficient of concordance between the directions of LDN and HBN measured with video-oculography and Frenzel goggles in all patients ( N = 40, LDN, κ = 0.66; p = 0.00, HBN, κ = 0.84; p = 0.00), pro-BPPV patients ( N = 14, LDN, κ = 0.67; p = 0.00, HBN, κ = 0.69; p = 0.01), and pos-BPPV patients ( N = 26, LDN, κ = 0.65; p = 0.00, HBN, κ = 0.88; p = 0.00).

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