After evaluation of the first 71 patients in this study, preoperative air-bone gap Ͼ20 (16.9% vs. 83.1, pϭ0.004) and pure tone average Ͼ20dB (21.1% vs. 78.9%, pϭ0.003 were the only preoperative factors associated with cholesteatoma recurrence. Intraoperatively, stapes erosion (OR 1.6, 95% CI 1.18-5.45) and cholesteatoma in the hypotympanum (OR 1.3, 95% 1.03-10.14) were the only factors associated with cholesteatoma recurrence. There were other factors approaching statistical significance and we expect them to when the larger sample size is evaluated. CONCLUSION: We have identified several factors that should make physicians increasingly vigilant for cholesteatoma recurrence and therefore more likely to perform a second look operation. While our data collection is still in process, we expect to identify further risk factors that are associated with cholesteatoma recurrence. Based on our large sample size, the data from this study will then be used to create an evidence based guideline for when to perform second look operations for cholesteatoma.
Objetivo: Comparar los resultados de timpanoplastia entre fascia temporal (GI) y cartílago auricular (GII) en perforación timpánica secundaria a trauma por onda explosiva. Diseño: Estudio de cohorte histórica. Métodos: Se incluyeron pacientes llevados a timpanoplastia tipo I, intervenidos entre febrero 1.º del 2007 y diciembre 31 del 2009. Los sujetos son miembros de las Fuerzas Armadas de Colombia, heridos en combate. Fueron excluidos aquellos sometidos a mastoidectomía u osciculoplastia. El resultado anatómico se evaluó mediante prueba exacta de Fisher, y el funcional, mediante Anova. Resultados: Se incluyeron 36 sujetos, GI = 16 y GII = 20. No hubo diferencias en el éxito anatómico entre GII = 95% (19/20) y GI = 87,5% (14/16), a los 12 meses (p = 0,57). En pacientes con cadena íntegra-móvil, la brecha aire-hueso a los seis meses (n = 30) fue de 5,8 dB (DE = 8 dB), y a los doce meses (n = 26) fue de 5,4 dB (DE = 8 dB). No hubo asociación entre el resultado funcional y el tipo de injerto utilizado (p > 0,05). Conclusiones: la timpanoplastia en perforación secundaria a trauma por onda explosiva ofrece resultados satisfactorios y estables a los doce meses, tanto con fascia como con cartílago.
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