Usefulness of Acoustic Otoscope recorder model 501 in infants.

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We have already described the experimental and clinical uses of a new model AOR-501 Acoustic Otoscope developed for group and individual diagnosis of otitis media with effusion. This study assesses its effectiveness in children aged 0-3 years, whom we were not able to include in the earlier study because a tympanography was not possible.Total of 162 ears in infants aged 0-3 years were tested with AOR-501. Examination was not possible in only 7 ears (4.3%), Of the 155 ears examined, 75 had middle ear effusion and 80 were normal.Among the 75 ears with middle ear effusion, AOR-501 made a correct diagnosis in 45, a sensitivity of 60.0%. No statistically significant difference was noted between infants and the older patients assessed in the previous paper (x2 test). The sensitivity of AOR-501 does not differ with age, averaging 61.9%.Among the 80 normal ears, AOR-501 judged 50 correctly (specificity 62.5%). The difference between infants and older patients was significant. That is, the specificity for those under 5 years of age was lower than in the older age groups.If this recorder is used for the examination of young children in day care center, the probability {(+) predictivity} of a correct diagnosis of middle ear effusion is estimated to be only 51.4 %. Therefore, we conclude that this recorder is not very useful. It has been shown to be much less accurate than tympanography in older children and adults, and it appears to be of little use in younger children in whom tympanography is not possible.

Usefulness of Acoustic Otoscope recorder model 501 in infants.

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