Dix-Hallpike maneuver for positional nystagmus: Findings in peripheral versus central vertigo

	Peripheral disorder	Central disorder
Latent period before onset of positional nystagmus	2 to 20 seconds	None
Duration of nystagmus	Less than 1 minute	Greater than 1 minute
Fatigability	Fatiguing with repetition	Nonfatiguing
Intensity of vertigo	Severe	Less severe, sometimes none

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