Abstract
We studied bacterial changes in the maxillary sinuses after endoscopic sinus surgery. Inresults, the bacteria which were found at the time of surgery were also found in post operative sinuses. It may be suggested that these pathogenic bacteria in chronic paranasal sinusitis resided in the sinus cavity as normal flora. Besides, we found bacteria in many sinuses which were sterile at the time of surgery within two months, and we thought that the bacteria which had resided in the nasal cavity moved into themaxillary sinuses from the ostium which was widely opened at the surgery.
We administered roxithromycin (RXM) for more than two months in the post operative follow-up period. Minimum inhibitory concentration (MIC) for the bacteria tended to rise.
