Received February 9, 2014 Revised April 21, 2014 Accepted April 22, 2014 Address for correspondence Hyung-Jong Kim, MD, PhD Department of OtorhinolaryngologyHead and Neck Surgery, Hallym University Sacred Heart Hospital, 22 Gwanpyeong-ro 170beon-gil, Dongan-gu, Anyang, Gyeonggi-do 431-796, Korea Tel +82-31-380-3841 Fax +82-31-386-3860 E-mail hjk1000@hallym.ac.kr Background and ObjectivesZZThere is no consensus on the prognostic factors regarding postoperative recurrence after myringoplasty. In this study, we investigated the preoperative clinical findings and postoperative results after primary myringoplasty and compared them with those of revision myringoplasty. Subjects and MethodZZComputerized database of 861 clinical records of last 20 years were analyzed retrospectively for the subjects who underwent myringoplasty at the Department of Otolaryngology, University of Korea. All the surgeries were done under general or local anesthesia by senior surgeons. Primary and revision cases of myringoplasty or type 1 tympanoplasty followed up at least for longer than 3 months were only included in the study. Those other cases of tympanoplasty types, concomitant ossiculoplasty and/or mastoidectomy, or those with the presence of cholesteatoma and those that required repair during exploratory tympanotomy were excluded. ResultsZZ535 primary and 101 revision cases have met our inclusion criteria. Overall, in this study, the failure rates of primary and revision myringoplasty were 11.02% and 5.94%, respectively. Significantly different among the prognostic factors were such as sex, age, anesthesia, surgical approach, the presence of otorreha, size of eardrum perforation, external auditory canal narrowing, valsalva test, degree of pneumatization, graft materials, tympanoplasty type, previous mastoidectomy, the presence of bilateral otitis media influencing on myringoplasty revision, and the presence of otorrhea and sclerotic type of mastoid pneumatization. ConclusionZZAmong various prognostic factors of myringoplasty, poor prognostic factors were preoperative otorrhea and poor pneumatization. Korean J Otorhinolaryngol-Head Neck Surg 2014;57(7):454-9