الفهرس 
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Abstract
Eustachian tube is a tube connecting middle ear cavity with nasopharynx and has a
very important role in equilization of pressure around TM.
ET function tests are important to evaluate its health and performing its functions. One of these function tests are tempanometry and passage of Methylene dye.
Myringoplasty means reconstruction of TM in cases of chronic suppurative otitis media with central perforation ” dry and safe ” type, which may has a role or effect on ET function post- operatively.
A prospective study included 37 patients who admitted to E.N.T Department at Sohag University Hospital during the period between March 2018 to March 2019 to undergo myringoplasty.
Analysis of medical charts of the patients was done to Investigate variables such as gender, age at the time of surgery, type of hearing loss and it’s degree, otological examination, pre-operative E.T function tests using tempanometry and methylene blue dye test.
Intra operative injection of saline in E.T orifice was done to all cases. Periosteal graft was used in all patients by underlay technique through post auricular incision. Post operative follow up for 3 months was recorded and cases with taken graft re-examined for E.T function by tempanometry to evaluate the effect of myringoplasty on it.
Statistical analysis was done for cases. Results of the study showed that there were 32 cases with taken graft, one patient was functioning by both tests pre operatively and non-functioning by tempanometry post-operatively, one patient was non-functioning by both tests pre operatively and functioning by tempanometry post-operatively, one patient was non-functioning by both tests pre operatively and still non-functioning by tempanometry post-operatively while sixteen patients were functioning by both tests pre operatively and still functioning by tempanometry post-operatively, eight patients were functioning by tempanometry with partial (7cases) or gross (1case) dysfunction by dye and still functioning by tempanometry post-operatively while one patient was functioning by tempanometry with gross dysfunction by dye and non-functioning by tempanometry post-operatively, There were four patients non-functioning by tempanometry with partial dysfunction by dye and still non-functioning by tempanometry post-operative with no clinical significant relationship between myringoplasty and its effect on E.T function.
We recommend more studies with large number of patients and studying of mastoid cavity by CT before operation, status of middle ear mucosa and E.T function by other tests than those mentioned in this study.
Conclusion Eustachian tube has a very important role in health of middle ear. There are many E.T function tests one of these is E.T function test by tempanometry and passage of methylene dye. In our study there was no effect of myringoplasty on E.T function.