The Microbiology Of Chronic Suppurative Otitis Media

The aim of the study was firstly to determine the most prevalent organisms in chronic suppurative otitis media and their susceptibility to various antibimicrobials so that an appropriate empiric antibiotic can be started promptly while awaiting the results of the culture and sensitivity. Secondly deduce a relationship between the types of microorganisms cultured from the discharge and the characters of this discharge. Thirdly detect the type of hearing loss associated with chronic suppurative otitis media. Design:Antrospective study.Place and Duration of Study: The study was conducted at Otolaryngology Department Zagazig University from Jan 2011 to August 2011.Subject and Methods: A total of 100 patients who were having chronic discharge from ear with tympanic membrane perforation were included in the study.A sample of the ear discharge was collected on the swab and cultured on appropriate media. A total of 100 patients were included in the study of which 56% were males and 44% were females.In our study no bacterial growth was seen in 5 swabs but superadded fungal growth while 95 swabs were positive for bacterial growth.We found that the main aerobic organism isolated in CSOM was Staphylococcus aureus (65%) followed by Pseudomonas aeruginosa (8%), Klebsiella (6%), Proteus (4%), Staph epidermidis (4%) &Heamophilus influnzae (4%). The main anaerobic organism isolated was Bacteroides (4%). The main fungus isolated was Aspergillus(5%).In the present study, the sensitivity of Staphylococcus aureus to Amikacin 93%, Ciprofloaxacin 89%, Cefotaxime 80%, Erythromycin 72%, Amoxicillin + Clavulanic acid 63%, Cephalexin 61% and Penicillin 50% of Staphylococcus aureus cases.In this work Pseudomonas was sensitive to Amikacin 100%, Ciprofloaxacin 50%, Cefotaxime 62%, Amoxicillin + Clavulanic acid 75%, Cephalexin 87%, and Penicillin 62% and Erythromycin 62% of Pseudomonas cases..