難聴幼児睡眠時の誘発反応聴力測定の信頼性について

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In order to evaluate the reliability of the slow vertex evoked response audiometry in young deaf children during sleep, response detectability, rate of false positive decision, agreement between scorers and test-retest agreement were investigated in 6 young children aged 2 to 4years with hearing impairment of 60 to 70 dB.The slow vertex evoked response was recorded with a 1000Hz pure tone at the intensity levels of 40, 60, 80 and 100 dB above averaged threshold of normal adults. Consecutive 50stimuli were averaged and 10 averaged traces were obtained at each intensity level and without stimulation per subject. Then 3 trained scorers made independently decisions of presence or absence of an evoked response on a total of 300 traces prepared. For investigating test-retest agreement, a retest was performed 18 months later on 150 traces obtained from 3 out of 6subjects.Results obtained were as follows:1. A marked increase in the response detectability was in changing the level of stimulus intensity from 60 to 80 dB (from 20.6% to 63.9%).2. The rate of false positive response was 7.2% of the traces without simulation.3. Agreement between 3 scorers was obtained in 77.0% of the total judgments.4. More than 90% agreement was achieved between the first and second judgments with an interval of 18 months.From the above mentioned results, the conclusion can be drawn that the slow vertex evoked response audiometry during sleep is reliable and valid in young children with impaired hearing.
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難聴幼児睡眠時の誘発反応聴力測定の信頼性について

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