Pre-operative prediction of 'dry taps'

The Journal of Laryngology and Otology
S HenneyC Watson

Abstract

The treatment of children with 'glue ear' often presents surgeons with the question of whether or not to insert a grommet when myringotomy reveals no fluid in the middle ear. We present a study designed to assess which factors contribute to the presence of a 'dry tap'. We prospectively gathered data from a cohort of 280 children (504 myringotomies). The cohort included two subgroups, one received halothane and nitrous oxide anaesthesia, and the other received enflurane anaesthesia. The ENT department of a district general hospital. Children (aged less than 17 years) requiring myringotomy. The presence of a 'glue' or dry tap at myringotomy was documented. We also recorded data on the following: pre- and post-induction tympanometry; age; season; anaesthetic type; and the delay from listing to actual operation. A non type B pre-induction tympanogram and delay to operation were strong indications of finding a dry tap at surgery. In our study population, the proportion of dry taps at myringotomy was 18 per cent. The presence of a dry tap was rarely due to the induction of anaesthesia. Multivariate analysis revealed that the combination of factors most likely to predict a dry tap were non type B tympanogram and delay to operation.

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Citations

Mar 3, 2011·International Journal of Pediatric Otorhinolaryngology·Chang Ho LeeKwang Joong Kim

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