Abstract
The surgical treatment of congenital aural atresia was analized statistically to find the pathogenesis in stenosis of created canal and loss of improved hearing. Thirty eight ears with congenital aural atresia were operated on to improve hearing during the recent 8 years. Tympanoplasty was performed in 19 ears and canaloplasty in the other 19 ears. Hearing was improved satisfactorily in 31.6% of canaloplasty cases and 84.2% of tympanoplasty cases. The most unpleasant and clinically important postoperative complications were the stenosis of created canal and the loss of improved hearing. The postoperative loss of improved hearing is caused by the scarring in the created canal and the middle ear cavity. The lateralization of new tympanic membrane and narrowing of created canal resulted in the same pathological changes. The results gained from our operated cases led to the following conclusions.1. Stenosis of the created external auditory canal is prevented by creating of canal with the diameter, 1.5 times longer than normal.2. The presence of a mobile stapedial f ootplate is the first condition to result in satisfactory postoperative hearing in the case operated with tympanoplasty.3. Lateralization of the created tympanic membrance is the primary cause of thegloss of improved hearing.
