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Journal of Speech and Hearing Research Vol.35 718-719 June 1992.
© American Speech-Language-Hearing Association
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The Effect of Stimulus Duration Using the Brookler-Grams Closed-Loop Caloric Irrigator

Elizabeth A. Karlsen 1
C. W. Norris 1

Ruth S. Hassanein 2
1 Otolaryngic Head & Neck Surgery Foundation Kansas City
2 Department of Biometry University of Kansas Medical Center Kansas City

Nystagmic responses to traditional 40-sec, 30 °C water calorics were recorded and compared to those obtained with the Brookler-Grams closed-loop irrigator using 30 °C, 40-, 50-, and 60-sec irrigations. Significant differences were noted between the responses to the water irrigator and the 40- and 50-sec closed-loop irrigations. The 60-sec closed-loop irrigation produced responses that were equivalent to the responses obtained with the water irrigation in slow component velocity, amplitude, frequency, latency, and duration. The 30 °C 60-sec closed-loop irrigation is an acceptable stimulus in electronystagmographic caloric testing.

KEY WORDS: caloric, closed-loop, Brookler-Grams

Submitted on June 3, 1991
Accepted on October 14, 1991


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