Results of bacteriological analyses carried out in 480 chronic ears showed that initially, 401 ears (83.5%) were infected; the most frequent bacteria were Ps. aeruginosa and St. aureus (22.5 and 21.3%). Local preoperative treatment reduced the number of infected ears to 48.2%. Specimens from the mastoid antrum and/or cells were positive in 50% of cholesteatoma ears and 20% of chronic ostitic ears. Bacteria were cultured even in 11% in dry or culture-negative ears. Ps. aeruginosa strains were most sensitive to streptomycin (69%) and next to colistin (31%). St. aureus was best sensitive to streptomycin (90%) and chloramphenicol (72%). Against Proteus strains, streptomycin was the most effective (82%) followed next by chloramphenicol (70%). Postoperative wound infection appeared in 11 ears (2.3%) and was most often due to St. aureus. Prolonged middle ear and ear canal infection continued postoperatively in 37 ears (7.7%), the main agent being Ps. aeruginosa.

Keywords:
Chronic otitis media, Bacteriological analyses, Pre- and postoperative discharge
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© 1969 S. Karger AG, Basel
1969
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