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Factors associated with positive urine cultures in cats with subcutaneous ureteral bypass system implantation

Pennington, C E; Halfacree, Z; Colville-Hyde, C; Geddes, R F


C E Pennington

Z Halfacree

C Colville-Hyde

R F Geddes


The aims of this study were to report the postoperative incidence of subcutaneous ureteral bypass (SUB)-associated bacteriuria and risk factors in a large population of UK cats, to identify the commonly implicated isolates in these cases and to report associations of positive postoperative urine cultures with device occlusion or a need for further surgery.

Electronic clinical records were reviewed to identify cats with ureteral obstruction that underwent unilateral or bilateral SUB implantation between September 2011 and September 2019. In total, 118 client-owned cats were included in the study population. Information recorded included signalment, history, surgical and biochemical factors, urinalysis and culture results. Multivariable logistic regression was performed to identify variables associated with a positive postoperative culture.

In total, 10 cats (8.5%) had a positive postoperative culture within 1 month postsurgery and 28 cats (23.7%) within 1 year postsurgery. Cats with a positive preoperative culture were significantly more likely to have a positive culture within 6 months postoperatively (odds ratio [OR] 4.09, 95% confidence interval [CI] 1.18–14.18; P = 0.026). Of the 14 cats with a positive preoperative culture, six (42.9%) returned a positive culture within 1 year postoperatively, and in four cases (66.7%) the same isolate was identified. Cats with a higher end-anaesthetic rectal temperature were significantly less likely to return a positive culture within 3 months (OR 0.398, 95% CI 0.205–0.772; P = 0.006) postsurgery. Cats culturing positive for Escherichia coli at any time point (OR 4.542, 95% CI 1.485–13.89; P = 0.008) were significantly more likely to have their implant removed or replaced.

Conclusions and relevance
Perioperative hypothermia and preoperative positive culture were independent predictors of a postoperative positive culture and this should be taken into consideration when managing these cases. Positive postoperative culture rates were higher than have previously been reported.


Pennington, C. E., Halfacree, Z., Colville-Hyde, C., & Geddes, R. F. (2020). Factors associated with positive urine cultures in cats with subcutaneous ureteral bypass system implantation. Journal of Feline Medicine and Surgery, 1098612X2095031.

Journal Article Type Article
Acceptance Date Jul 22, 2020
Publication Date Aug 25, 2020
Deposit Date Sep 17, 2020
Publicly Available Date Sep 17, 2020
Journal Journal of Feline Medicine and Surgery
Print ISSN 1098-612X
Publisher Elsevier
Peer Reviewed Peer Reviewed
Pages 1098612X2095031
Public URL
Publisher URL


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