Time course of positive reaction in glycerol test.

概要

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To determine the adequate evaluation time of the glycerol test, the time course of the pure-tone threshold was investigated before and after (1, 2 and 3 hours) glycerol intake in 54 patients who showed a positive reaction to the glycerol test.The incidence of positive reaction was 74% at 3 hours after glycerol intake and this value was the highest during the 3 hour observation. There were, however, 14 patients who exhibited positive results only at 1 or 2 hours after glycerol intake. The results of the glycerol test in these patients would be evaluated as negative if evaluated only at 3 hours as is usually done. Thus, the hearing test should be performed every hour for 3 hours after glycerol intake.Analysis of the hearing threshold at each frequency tested (0.125 to 8kHz), revealed that threshold improvement was greatest in the middle frequency range and smallest at high frequencies. The cause of these differences in hearing improvement was unclear. Further study is necessary to clarify it.
耳鼻咽喉科臨床学会の論文