In order to obtain useful findings for a clinical diagnosis of extrinsic causes of tinnitus, the influence of sound load was studied in 1, 354 cases.
The sound load test was conducted in 707 cases of head trauma, 323 cases of noise trauma, and 324 miscellaneous cases. After 2 minutes loading with 2, 000Hz, 90dB, presence or absence of tinnitus, or change in tinnitus were recorded on the test side (loaded ear) and contralateral side (non-loaded ear) after recovery to pre-loading threshold.
And the following results were obtaind:
1) The proportion of cases with a positive change was 30.75, 28.89 and 24.15% in the group of head trauma, miscellaneous group, and group of noise trauma, respectively.
2) The proportion of a positive change according to the property of tinnitus gradually decreasedd from the continuous group, to the intermittent group to the group without tinnitus, and the ratio of the change on the tested side also gradually decreased.
3) In the whole series and the group without tinnitus, the overall rate of positive change, the rate of positive change on the tested side, and the rate of positive change on the contralateral side all decreased with advancing age, giving a statistically significant difference (P≤0.05).
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