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  • Title: Head position dependency of induced nystagmus to ice-water irrigation in peripheral vestibulopathy.
    Author: Choi BY, Koo JW, Oh SH, Chang SO, Kim CS.
    Journal: Otolaryngol Head Neck Surg; 2005 Sep; 133(3):334-8. PubMed ID: 16143177.
    Abstract:
    OBJECTIVE: Evaluation of head-position dependency during the ice-water test is essential when the test is indicated. Because ice-water irrigation (IWI) in the prone position is frequently skipped in many laboratories, we investigated the importance of evaluating position dependency in an ice-water test. DESIGN AND SETTING: Twenty-five unilateral peripheral vestibulopathy patients showing no nystagmus during warm irrigation were included. IWI was performed in supine and prone positions, and maximum slow-phase velocity and direction of nystagmus were assessed by using video nystagmography. RESULTS: Eleven cases showed head-position dependency and were interpreted as hypofunctional. Fourteen cases showed no dependency, suggesting the absence of end organ function. In the latter group, 6 patients showing definite nystagmus in supine position could have been misinterpreted as hypofunctional, had it not been for prone-position results. CONCLUSIONS: Evaluation of head position dependency by using IWI is important in the determination of lateral semicircular canal function.
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