Effect of tympanic cavity evacuation and flushing on microbial isolates during total ear canal ablation with lateral bulla osteotomy in dogs.

Hettlich, Bianca Felicitas; Boothe, Harry W; Simpson, R Bruce; Dubose, Kim A; Boothe, Dawn M; Carpenter, Mark (2005). Effect of tympanic cavity evacuation and flushing on microbial isolates during total ear canal ablation with lateral bulla osteotomy in dogs. Journal of the American Veterinary Medical Association, 227(5), pp. 748-755. American Veterinary Medical Association

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OBJECTIVE

To evaluate differences in bacterial numbers, identity, and susceptibility in samples obtained from the tympanic cavity on entry (preflush) and after evacuation and lavage (postflush) and assess perioperative and empiric antimicrobial selection in dogs that underwent total ear canal ablation (TECA) with lateral bulla osteotomy (LBO) or reoperation LBO.

DESIGN

Prospective clinical study.

ANIMALS

34 dogs.

PROCEDURE

TECA with LBO or reoperation LBO was performed on 47 ears. Pre- and postflush aerobic and anaerobic samples were obtained from the tympanic cavity. Isolates and antimicrobial susceptibility patterns were compared.

RESULTS

Different isolates (31/44 [70%] ears) and susceptibility patterns of isolate pairs (6/44 [14%] ears) were detected in pre- and postflush samples from 84% of ears. Evacuation and lavage of the tympanic cavity decreased the number of bacterial isolates by 33%. In 26% of ears, bacteria were isolated from post-flush samples but not preflush samples. Only 26% of isolates tested were susceptible to cefazolin. At least 1 isolate from 53% of dogs that received empirically chosen antimicrobials postoperatively was resistant to the selected drugs. Anaerobic bacteria were recovered from 6 ears.

CONCLUSIONS AND CLINICAL RELEVANCE

Accurate microbiologic assessment of the tympanic cavity should be the basis for selection of antimicrobials in dogs undergoing TECA with LBO. Bacteria remain in the tympanic cavity after evacuation and lavage. Cefazolin was a poor choice for dogs that underwent TECA with LBO, as judged on the basis of culture and susceptibility testing results.

Item Type:	Journal Article (Original Article)
Division/Institute:	05 Veterinary Medicine > Department of Clinical Veterinary Medicine (DKV) 05 Veterinary Medicine > Department of Clinical Veterinary Medicine (DKV) > Small Animal Clinic > Small Animal Clinic, Surgery 05 Veterinary Medicine > Department of Clinical Veterinary Medicine (DKV) > Small Animal Clinic
UniBE Contributor:	Hettlich, Bianca Felicitas
Subjects:	600 Technology > 610 Medicine & health
ISSN:	0003-1488
Publisher:	American Veterinary Medical Association
Language:	English
Submitter:	Bianca Felicitas Hettlich
Date Deposited:	30 Mar 2016 07:52
Last Modified:	05 Dec 2022 14:52
PubMed ID:	16178396
URI:	https://boris.unibe.ch/id/eprint/77360