Posterior canal benign paroxysmal positioning vertigo (posterior canal BPPV)

Main cause: canalithiasis/ cupulolithiasisTheoretically can affect each of three semicircular canal but most commonly posterior semicircular canal is affected.Common diagnostic manoeuvre: Dix-Hall pike manoeuvreSince posterior semicircular canal is the most gravity dependent part of vestibular labyrinth both in upright and supine position, once the debris enter into posterior canal, the cupular barrier in the shorter and more dependent end blocks the exit of debris.Patients complain of light-headedness, nausea, imbalance, reversal nystagmus and in severe cases, sensitivity to all direction of head movements also exists. In certain situation, though benign may become dangerous.Cause: idiopathicCommonly found age group: 50-70 yearsTerminologies used:
Canalithiasis: free floating particle within the semicircular canal.
Cupulolithiasis: particles adherent to cupula of semicircular canal.

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