Microbial study of pre and postoperative mastoid cavities: a comparative study

Hari Krishna Kishore, C. Mallikarjuna Reddy


Background: This was a comparative microbial study of pre and postoperative mastoidectomy. The aim of the present study was to evaluate various causes responsible for discharging mastoid cavity.

Methods: Total of 160 patients of which 100 cases were of preoperative group and 60 cases were postoperative group included in the study.  

Results: Mono infection was seen in 95% and 86.7% in pre and postoperative cases respectively; where as 5% of preoperative and 13.3% of postoperative cases were diinfections. Pseudomonas (32%) was found in highest number followed by Staphylococcus aureus (16%), Klebsiella spp. (16%), Escherichia coli (15%), Proteus mirabilis (14%), Aspergillus fumigatus (2%), Candida (1%), and Cladosporium (1%) in preoperative cases. In postoperative cases, 46.7% of Pseudomonas spp, followed by 16.5% Staphylococcus, 16.7% Klebsiella spp, 11.7% Proteus mirabilis, 10% Escherichia coli, 8.3% Aspergillus fumigatus and 5% Candida were isolated.

Conclusions: Multiple factors were responsible for otorhhoea with significant contribution from the microbes.


Bacterial Infection, Preoperative, Postoperative, Mastoid cavities, Otorrhoea

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McGuekin F. Recent advances in tympanoplastic surgery. J laryngol and Otol. 1958;72:535-45.

Thorburn TB. A critical review of thypanoplastic surgery. J laryngol and Otol. 1960;74:453-74.

Portman M. Tympanoplasty technique and experiences with tympanoplasic surgery. Arch Otolaryngol. 1963;78:2-19.

Ekvall L. Total middle ear reconstruction. Acta Otolaryngol. 1973;75:279–81.

Gyo K, Hirata Y, Yanagihara N. Changes in bacterial flora in the tympanic cavity following tympanoplasty. Otorhino Clinic. 1993;86:1403–7.

Palva T, Hallstrom O. Bacteriology of chronic otitis media. Arch Otolaryng. 1965;82:359–64.

Chhapola S, Matta I. Mastoid Obliteration Versus Open Cavity: A Comparative Study. Indian J otolaryngol Head Neck Surg. 2014;66(1):207–13.

Mishra SC, Kushwaha JLM, Vrat S. Microbial studies of postoperative mastoid cavities. Inidal J Otolaryngol. 1990;42:63-5.

Brook I, Finegold SM. Bacreriology of Chronic otitis media. J Am Med Assoc. 1979;241:487-8.

Shim HJ, Park CH, Kim MG, Lee SK, Yeo SG. A pre- and postoperative bacteriological study of chronic suppurative otitis media. Infection. 2010;38:447-52.

An-ting X, Ming X, Han-Bing Z, Kimitaga K. Bacteriolgy before and after total middle ear reconstruction. J Otol. 2007;2(2):114-8.

Abdul-Lateef Mousa H. A prospective study of seven patients with chronic mastoiditis. JMM Case Rep. 2015;2:1-5.

Verhoeff M, van der Veen EL, Rovers MM, Sanders EA, Schilder AG. Chronic suppurative otitis media: a review. Int J Pediatr Otorhinolaryngol. 2006;70:1–12.

Madana J, Yolmo D, Kalaiarasi R, Gopalakrishnan S, Sujatha S. Microbiological profile with antibiotic sensitivity pattern of cholesteatomatous chronic suppurative otitis media among children. Int J Pediatr Otorhinolaryngol. 2011;75:1104–8.

Elango S, Than T. Mastoiditis in Kelantan. Med J Malaysia. 1995;50:233–6.

Apte BC. Towards a dry ear. J Otolayngol. 1960;12:91-7.