The effect of stimulus duration using the Brookler-Grams closed-loop caloric irrigator.
Nystagmic responses to traditional 40-sec, 30 degrees C water calorics were recorded and compared to those obtained with the Brookler-Grams closed-loop irrigator using 30 degrees 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 degrees C 60-sec closed-loop irrigation is an acceptable stimulus in electronystagmographic caloric testing.
Karlsen
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EA
Otolaryngic Head & Neck Surgery Foundation, Kansas City.
Norris
C W
CW
Hassanein
R S
RS
D000293:Adolescent; D000328:Adult; D002150:Caloric Tests / Q000295:instrumentation* / Q000379:methods; D004584:Electronystagmography / Q000295:instrumentation* / Q000379:methods; D006801:Humans; D008297:Male; D013696:Temperature; D007507:Therapeutic Irrigation / Q000295:instrumentation / Q000379:methods; D013997:Time Factors