How to diagnose a new type of vertigo

Clinicians can administer a simple headshaking manoeuvre

Neurologists from South Korea have identified a new type of vertigo that responds to treatment.

vertigo

Called recurrent spontaneous vertigo (RSV), the condition has no known cause but is characterised by a marked susceptibility to motion sickness and prolonged nystagmus.

To identify RSV, doctors can administer a simple head-shaking manoeuvre by moving the patient's head forward then shaking horizontally for about 15 seconds in a dark room.

A video recording is then taken of eye movements and the time constant measured to determine how the reflexive

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