Abstract
Transrectal prostate biopsies carry the risk of infection. By using non-selective culture plates, instead of commonly used ciprofloxacin (CIP)-containing plates, we analyzed the association between Escherichia coli CIP minimal inhibitory concentration (MIC) and post-biopsy infectious complications. A pre-biopsy rectal swab was taken from 207 consecutive men, scheduled for transrectal 12-core prostate biopsy with CIP 750 mg as the mostly used prophylaxis. CIP MIC of rectal Gram-negative bacilli was determined from a chromogenic agar. Rectal E. coli were categorized to resistant (R) and intermediate (I) isolates together (R + I, MIC > 0.25 mg/l) and to sensitive (S, MIC ≤ 0.25 mg/l) using EUCAST clinical breakpoints. In addition, epidemiological cutoff (ECOFF R, MIC > 0.064 mg/l) was used for categorization. Eighteen (8.7%) men showed CIP R + I E. coli by the EUCAST breakpoints and 41 (19.8%) using the ECOFF R criteria. During follow-up, 15 (7.2%) men had infectious symptoms, of which 9 (4.3%) were culture-confirmed infections. Only 4 (26.7%) of these 15 patients showed R + I E. coli in the rectal swab according to EUCAST, but 10 (66.7%) using the ECOFF cutoff. Rectal E. coli CIP R + I by the EUCAST clinical breakpoints associated with infectious complications with OR 5.7 (95% CI 1.5–21.8, P = 0.005) and ECOFF R E. coli by OR 10.7 (95% CI 3.0–37.6, P < 0.001). Men carrying rectal E. coli with moderately lowered CIP susceptibility (MIC > ECOFF 0.064 mg/l) were identified and, interestingly, they showed a high risk of developing infectious symptoms after the biopsy. This explains why some men develop infectious complications despite appropriate antibiotics before prostatic biopsies. Trial registration: NCT02140502
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Acknowledgements
We thank our study nurses Merja Rignell and Katja Kiianlinna for their valuable assistance throughout the study.
Funding
This work was supported by Competitive State Research funding (TYH2013345 and TYH2015313 to A. R.), a grant from the Finnish Cancer Society (7553 to A. R.), and a grant from the Finnish Urological Association (2016 and 2017 to I. K.).
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The ethics committee of the Department of Surgery at Helsinki University Hospital approved the study and the trial was registered at ClinicalTrial.Gov (NCT02140502).
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Informed consent was obtained from all individual participants included in the study.
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Kalalahti, I., Huotari, K., Lahdensuo, K. et al. Rectal E. coli above ciprofloxacin ECOFF associate with infectious complications following prostate biopsy. Eur J Clin Microbiol Infect Dis 37, 1055–1060 (2018). https://doi.org/10.1007/s10096-018-3217-7
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DOI: https://doi.org/10.1007/s10096-018-3217-7