![]() ![]() The Armstrong Beveled Grommet, Donaldson, and Richard's Wing tubes showed the largest improvements in air conduction threshold with mean decreases of 22.1, 18.7 and 18.3 dB, respectively. For 5 tubes the mean threshold was less than 10 dB. With the exception of the Reuter Bobbin, all mean air conduction thresholds in functioning tubes were below 20 dB. A total of 8 tube types showed mean improvements of 10 dB or better. The change in pure tone average air conduction showed a range in improvement from 22.1 dB for the Armstrong Grommet Tube to 1.9 dB for the Canoe Tube. The first post-operative audiogram was tabulated for all the initial post-operative visits and for only the initial post-operative visits in which the tubes were functioning. The audiograms were analyzed for changes in air and bone thresholds at 250, 500, 1000, 2000, 40 Hz. Ten (1.32%) perforations that have not resolved over time were noted after Armstrong tube placement.Ĭonclusions Armstrong beveled grommet tympanostomy tubes have complication rates comparable with those reported for Armstrong or other short-acting tubes in smaller series.The audiograms of 59 patients who had 15 different types of tubes implanted in a prospective study from 1982 to 1985 were reviewed. Four patients had histories of cholesteatoma, none of which developed in conjunction with Armstrong tubes. One hundred sixty episodes of otorrhea were noted in 148 patients. Mean and median times to extrusion were 16.5 and 15.5 months. The mean patient age at tube placement was 33.3 months, and the median age was 23 months. Follow-up to extrusion rates were available for 756 tubes. One thousand ninety-six Armstrong tubes were placed in these patients. ![]() Results Five hundred seven consecutive patients who had Armstrong tubes placed were reviewed. Otorrhea, perforation, and cholesteatoma rates were also assessed. Main Outcome Measures Patient age, diagnosis, operative findings, and time to tube extrusion were reviewed. ![]() This study was performed to assess outcome measures and complication rates of the Armstrong beveled grommet tube.ĭesign A retrospective case series of patients who had Armstrong beveled grommet tympanostomy tubes placed over a 3 year period by two Children's Hospital of Wisconsin pediatric Otolaryngology staff. An ideal tube would be easy to insert and would extrude at a predictable interval without complications. Despite the frequency of ventilation tube placement, very few large studies have examined the outcomes of patients receiving this procedure. ![]() Objective Many different tympanostomy tubes have been developed with different sizes, shapes, compositions, and coatings. ![]()
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