In the Epley maneuver for posterior canal BPPV, the treatment works by:

• A Cupulolith theory: dissolving the otolith crystals adherent to the cupula
• B Canalith repositioning: moving free otoconia from the posterior semicircular canal back into the utricle ✓
• C Habituating the labyrinthine response through repeated positional changes
• D Causing central compensation of vestibular asymmetry

Explanation

The Epley canalith repositioning maneuver is based on the canalith repositioning theory (Epley, 1992): free-floating otoconia (calcium carbonate crystals) in the posterior semicircular canal are moved through a series of head position changes from the posterior canal, through the common crus, into the utricle, where they are reabsorbed or disperse. This is distinct from the cupulolith theory, which posits crystals adherent to the cupula (treated by the Semont maneuver or habituation exercises). Success rate >80% in a single session.

Reference: Dhingra Diseases of Ear, Nose and Throat, 7th ed.

High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP

Written and medically reviewed by the StethoPrep medical team.