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BJB. Is the standard Dix-Hallpike procedure sufficient to diagnose positional vertigo?. Positional Vertigo from Canal LithiasisMathematical models predict latencies and magnitudes consistent with clinical observationMagnitude = total weight of particlesLatency = time to move from ampulla to apexTrans-cupular pressure is generatedIncreased as particles move through narrowing ductAverage 5sec to transitOne otoconia= 30pL and 2 deg/sec nystagmusRajguru SM Ann Biomed Eng 2004 Jun;32(6):831-9445

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