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Balancing the caloric-induced nystagmus velocity with cold air and water.
British journal of audiology. 1998;32(5):301-4.
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Abstract
A useful alternative to the traditional water caloric is to use an air stimulus. However, the caloric test has not been standardized and a range of parameters are being used in different audiology clinics. The aim of this study was to determine cold air parameters that resulted in a similar slow-component eye velocity to that for water irrigation. Twelve normal subjects underwent caloric testing using air temperatures in the range 18-33 degrees C. The duration and air-flow rate were held constant at 60 s and 5 l/min. A water irrigation at 30 degrees C for 30 s and delivering 150 ml resulted in a mean slow-component eye velocity of 17 degrees/s. An equal response was obtained with an air temperature of 21.0 degrees C. Further work is required to find equivalent air and water responses for other combinations of parameters.