Abstract
ObjectiveTo study the influence of unilateral air flow rate change on the result of caloric test. Materials and MethodsThe unilateral weakness (UW) index was calculated when the air flow rate was set at 6 L/min in both ears(called symmetric stimulation) and again when it was set at 6 L/min in left ear and 3 L/min in the right ear(called asymmetric stimulation). Each individual subject was tested with both symmetrical and asymmetrical stimulations. Paired t test was used to examine the differences between results from symmetrical and asymmetrical stimulations. ResultUW index decreased in response to asymmetrical stimulation. ConclusionUnilaterally decreased air flow rate can produce indices suggesting ipsilateral UW, which can be misleading.
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