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Test-retest reliability of open-loop bithermal caloric irrigation responses from healthy young adults
1School of Communicative Disorders, University of Wisconsin--Stevens Point, 54481, USA.
Objective:
To determine normal caloric responses and test-retest correlations of caloric responses in a group of otologically normal persons using an open-loop caloric irrigation system.
Study Design:
An open-loop bithermal caloric irrigator was used to obtain maximum slow component speed caloric responses of healthy young persons with a repeat caloric test occurring- 1 week later.
Setting:
The caloric examination took place in a university speech and hearing clinic.
Subjects:
Twenty healthy young adults (10 men and 10 women, ranging in age from 18 to 33 years) who reported no history of dizziness or hearing loss were recruited at a university. They had thresholds of 25 dB HL or better for frequencies 250 of 8000 Hz and had passed an examination performed by an otologist.
Results:
The mean unilateral weakness (UW) response was 1.73% with a standard deviation of 12.1%. Test retest correlations were 0.82 for UW and 0.80 to 0.90 for individual ear responses.
Conclusions:
The results indicate that a minimum of a 25% UW should be present when identifying a significant UW. Also the test-retest correlations were considerably higher using an open-loop irrigator than those obtained using a closed-loop irrigation system in a previously reported study.
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