Affected-Ear-Up 90° Maneuver Proves That Nystagmus Does Not Occur by the Stimulation to the Macula of the Utricle

Background: The utricular macula is located on the floor of utricle, approximately in plane lateral semicircular canal, and oriented to respond best tilts side-to-side or fore-and-aft translations head. However, details otolith ocular reflex are unknown. Pathophysiology transient direction-changing geotropic positional nystagmus a canalolithiasis canal. principle affected-ear-up 90° maneuver moving debris from long arm therefore stimulates sitting position after treatment. Objective: To clarify whether occurs by stimulation utricle. Methods: subjects were 10 patients with canal canalolithiasis. After diagnosis, we performed immediately. We observed eye movements (chin-down 30°) just Results: No one showed In all patients, disappeared within 7 days Conclusion: Nystagmus does not occur Hence, cannot assess function utricle analysis movements, counter-rolling considered be reflex.