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HOME > Urogenit Tract Infect > Volume 16(3); 2021 > Article
Original Article Changes of Antimicrobial Resistance Causing Infections Following Transrectal Prostate Biopsy: Analysis of 10-Year Data
Da Eun Hanorcid, Sun Tae Ahnorcid, Jong Wook Kimorcid, Du Geon Moonorcid, Hong Seok Parkorcid, Mi Mi Oh,orcid
Urogenital Tract Infection 2021;16(3):55-60.
DOI: https://doi.org/10.14777/uti.2021.16.3.55
Published online: December 31, 2021

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Correspondence to: Mi Mi Oh, orcid , Department of Urology, Korea University Guro Hospital, 148 Gurodong-ro, Guro-gu, Seoul 08308, Korea, Tel: +82-2-2626-3203, Fax: +82-2-2626-1321, E-mail: mamah@hanmail.net
• Received: October 27, 2021   • Revised: December 10, 2021   • Accepted: December 16, 2021

Copyright © 2021, Korean Association of Urogenital Tract Infection and Inflammation. All rights reserved.

This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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  • Purpose
    The production of extended-spectrum b-lactamases (ESBLs) has emerged as one of the main causes of antimicrobial resistance. It is well known that infections of ESBL-producing Enterobacteriaceae causes poor clinical outcomes. This study investigated the changes in the antimicrobial resistance patterns in infections following transrectal ultrasound-guided prostate (TR) biopsy over a 10 year period and analyzed whether the clinical course varies in infections caused by the ESBL-producing Enterobacteriaceae.
  • Materials and Methods
    We retrospectively analyzed patients who had infections after a TR biopsy at the Korea University Guro Hospital from January 2010 to October 2019. Infection from a TR biopsy was defined as readmission due to a fever of 38 degrees or higher that occurred within one week after the biopsy.
  • Results
    Among 1,855 patients who received a TR biopsy, 39 patients (2.10%) had infectious complications. Of 33 culture-positive patients, 29 patients (87.9%) showed quinolone resistance, 10 patients (30.3%) were ESBL-positive and 9 patients had concomitant quinolone resistance and were also ESBL-positive. 75% of ESBL-positive bacterial infections occurred after 2016 indicating increasing incidence in recent days. The only significant difference in the clinical course between the ESBL-negative and the positive group was the lower systolic blood pressure of the ESBL-positive group during hospitalization (p-value=0.018).
  • Conclusions
    Infections due to the ESBL-producing Enterobacteriaceae showed a tendency to increase among TR biopsy patients since 2016. Although the clinical course of the ESBL-positive infection did not show significant differences to ESBL-negative infection, further analysis is needed because of the small number of patients.
As more people undergo a prostate-specific antigen (PSA) test for health checkups, the number of prostate biopsies is also rising. The transrectal ultrasound-guided prostate (TR) biopsy is used most frequently to detect prostate cancer [1]. In addition, the prostate biopsy-related infection rate has increased from 0.1% to 7.0%. Among them, the sepsis rate has increased from 0.3% to 3.1% [2,3]. A possible explanation for this trend is the high incidence of antibiotic resistance in the community. In Korea, the fluoroquinolone resistance of Escherichia coli has reached 48%. Following quinolone resistance (QR), extended-spectrum β-lactamase (ESBL)- producing Enterobacteriaceae has emerged as one of the leading causes of antimicrobial resistance. Approximately a quarter of Enterobacteriaceae had ESBL in Korea [4,5]. In addition, ESBL-producing Enterobacteriaceae causes the worse clinical outcome [5,6].
This study investigated the changes in antimicrobial resistance of infectious complications following a TR biopsy in 10 years, and analyzed whether the clinical course varies according to the infections caused by ESBL-producing Enterobacteriaceae.
Patients who had infectious complications after a TR biopsy in Korea University Guro Hospital from January 2010 to October 2019 were analyzed retrospectively. The patients were selected for the biopsy if they had one or more of the following criteria: palpable nodules or abnormal signs on a digital rectal examination, PSA level higher than 4 ng/ml with no pyuria, and hypoechoic lesion in transrectal ultrasound. Those with a PSA level higher than 2 ng/ml were included if the patient had been taking 5-alpha reductase inhibitors for more than six months.
All biopsies were performed by a TR, 12-core systematic biopsy using the same biopsy gun product. A rectal povidone-iodine preparation after an enema was performed prior to the biopsy. Regarding prophylactic antibiotics, intravenous ciprofloxacin 400 mg was administered just before and within 24 hours from the biopsy. After discharge, oral fosfomycin 3 g was administered twice per day.
The infection due to the TR biopsy was defined as prolonged hospitalization or readmission due to a fever of 38°C or higher, accompanied by low urinary tract symptoms and pyuria that occurred within one week after the biopsy. Stable vital signs lasting more than two days and normalized laboratory results of inflammation were required before the patient was discharged.
The following patient data were retrieved: age, PSA, prostate volume, medical comorbidity, history of antibiotics usage, and Foley catheter insertion three months before the procedure, whether other surgeries were performed at the time of the biopsy, bacterial strain, the susceptibility to antibiotics of a urine and blood culture, and the types of antibiotics used to treat fever. The changes in antimicrobial resistance, particularly QR and the presence of ESBL-pro-ducing over 10 years, were assessed.
The presence of sepsis, highest fever, lowest systolic blood pressure (SBP), highest white blood cell count (WBC), erythrocyte sedimentation rate (ESR), and C-reactive protein (CRP), fever duration, total admission days were reviewed to characterize the clinical course of infection. Sepsis was defined as a confirmed or suspected infection with systemic inflammatory response syndrome (SIRS). SIRS requires two or more of following four signs: body temperature >38℃ or <36℃, heart rate >90/min, respiratory rate >20/min or PaCO2 <32 mmHg and WBC >12×103/µl or <4×103/µl or >10% immature band neutrophils of total WBC [7]. The difference in the baseline and clinical course characteristics between the ESBL-negative and the positive infections were analyzed.
1. Statistical Analyses and Ethical Statement
A Mann–Whitney U-test and Fisher’s exact test were used to analyze the continuous and categorical variables, respectively. All statistical analyses were performed using IBM SPSS version 24.0 (IBM Co., Armonk, NY, USA). All calculated p-values were two-sided, with statistical signi-ficance defined as p<0.05. This study proposal was approved by the Korea University Guro Hospital Institutional Review Board (IRB No. 2021GR0456). The demand for participants' informed consent was waived by the IRB.
From January 2010 to October 2019, 1,855 TR biopsies were performed. Among them, 39 patients (2.10%) had infectious complications and required admission. Table 1 lists the baseline characteristics. Ertapenem was the most commonly used empirical antibiotic for infection compli-cations, followed in order by ciprofloxacin and meropenem (Table 1).
All patients underwent culture tests from the blood and urine on the readmission date. Bacteria were identified in 33 patients: 19 in both urine and blood, eight in the blood only, and six in the urine only. E. coli was identified in all patients except for one in which Staphylococcus aureus was identified. Of the 33 culture-positive patients, 29 (87.9%), 10 (30.3%), and nine (27.3) patients showed QR, ESBL-posi-tive, and concomitant QR plus ESBL-positive, respectively. During the study period, QR bacteria occurred in all periods except at 2015 and showed a sharp increase after 2016 (Fig. 1A). ESBL-positive bacteria were identified intermittently, but 75% of them occurred after 2016 (Fig. 1B). The incidence of both QR and ESBL-positive bacteria increased their incidence over time (Fig. 1C).
There was no significant difference in the basic charac-teristics of patients with or without ESBL production. On the other hand, patients with ESBL-producing bacteria had a lower SBP and higher ESR values than those without ESBL-producing bacteria (Table 2).
Observational studies at a single center from 2010 to 2019 revealed a 2.10% readmission rate due to infection complications after TR biopsy. Bacteria were cultured in 33 patients with E. coli accounted for 97.0%. QR was 87.9%, and the ESBL-positive rate was 30.3%. From 2016, a sharp increase in QR was noted, and 79.3% occurred after 2016. The ESBL-positive cases also mostly appeared after 2016, comprising 75% of the total incidence. All ESBL-positive bacteria except for one that occurred in 2011 showed QR. The number of bacteria showing both QR and ESBL-positive also increased with time, and 77.8% were identified after 2016. According to a review article conducted in Korea, the post-TR biopsy incidence ranged from 0.65% to 3.1% [1]. A multicenter study including Korea revealed a 3.1% readmission rate due to a post-TR biopsy infection [8]. Another study conducted in Korea from 1995 to 2013 found that 95.0% of post-TR biopsy infections were caused by E. coil. The QR and ESBL-positive rates were 93.6% and 21.3%, respectively, and all ESBL-positive bacteria showed QR [9]. After reviewing these references, the infection rate at the authors’ institution was not inferior to other centers and had similar outcomes regarding the bacterial species and their resistance rate.
Many studies claimed that ESBL-producing Enterobac-teriaceae infections have a more devastating clinical course. First, it is more virulent than the ESBL-negative strain. Second, the use of antibiotics that target ESBL-positive bacteria is delayed [6,10]. In a preemptive study conducted at the same center as in this investigation, post-TR biopsy ESBL-positive infections had a longer fever duration, hospital days, and higher infection serum markers than a negative infection [6]. On the other hand, there was no clinical difference in this study except for the lowest SBP. This can be explained by the use of carbapenem as empirical antibiotics in 64.1% of cases, considering that the causative bacteria of fever are ESBL-positive. Many studies recommend different empirical antibiotics for post-TR biopsy infection, but the central concept is identical. Broad-spectrum antibiotics covering both QR and ESBL-positive bacteria, such as carbapenem, amikacin, or third-generation cephalosporin, are used initially [1,2,9]. As the carbapenem resistance rate is relatively lower than cephalosporin in Korea, the institution administered carbapenem first for post-TR biopsy infections [4].
There were some limitations to this study. First, it was a retrospective study, and the patient’s medical history, particularly prior biopsy antibiotics usage, may not be accurate. Second, statistical significance was difficult to derive because of the small number of infections. Furthermore, the risk factors for ESBL-positive infection could not be analyzed.
Nevertheless, there was a change in the antibiotic resistance rate of patients with complications of infection after TR biospy over the recent 10 years. In particular, the increasing trend of ESBL-positive strain was confirmed.
Infectious complications among TR biopsy patients due to ESBL-producing Enterobacteriaceae have shown a tendency to increase since 2016. There were no significant differences in the clinical courses based on the result of the ESBL-producing Enterobacteriaceae. Further analysis will be needed because of the small number of patients.
This work was supported by a KAUTII research grant.

CONFLICT OF INTEREST

No potential conflict of interest relevant to this article was reported.

AUTHOR CONTRIBUTIONS

D.E.H. participated in data collection and wrote the manuscript. M.M.O., S.T.A. and D.E.H. participated in the study design and performed the statistical analysis. J.W.K., D.G.M., and H.S.P. participated in the study design and coordination and helped to draft the manuscript. All authors read and approved the final manuscript.

Fig. 1
(A-C) Incidence of antibiotic resistance infection by year. (A) Quinolone resistance (QR) incidence. (B) Extended-spectrum β-lactamase (ESBL) production incidence. (C) Concomitant QR and ESBL production.
uti-16-3-55-f1.jpg
Table 1
Baseline characteristics of the patients with infectious complications (n=39)
Variable Value
Age (yr) 63±9.62
PSA (ng/ml) 7.63±3.71
Prostate volume (g) 46.65±19.12
Prostate cancer 6 (15.4)
HTN 19 (48.7)
CHF 10 (25.6)
COPD 3 (7.7)
CKD 3 (7.7)
Liver disease 3 (7.7)
DM 16 (41.0)
Neurologic Dz 8 (20.5)
BPH medication 34 (87.2)
h/o Foley catheter insertion 4 (10.3)
Concomittant op 7 (17.9)
Usage of immunosuppressants 2 (5.1)
h/o Cephalosporin usage 4 (10.3)
h/o Fluoroquinolone usage 7 (17.9)
Antibiotics treatment
Ertapenem 21 (53.8)
Cefotaxime 3 (7.7)
Ciprofloxacin 7 (17.9)
Amikacin+Ciprofloxacin 1 (2.6)
Ceftriaxone 1 (2.6)
Piperacillin/tazobactam 1 (2.6)
Meropenem 4 (10.3)
Cefpiramide 1 (2.6)

Variable Values are presented as mean±standard deviation or number (%). Concomitant op means that TR biopsy was done during urologic surgery.

PSA: prostate-specific antigen, HTN: hypertension, CHF: congestive heart failure, COPD: chronic obstructive pulmonary disease, CKD: chronic kidney disease, DM: diabetes mellitus, Neurologic Dz: neurologic diseases, such as a past cerebrovascular accident or spinal cord injury, BPH: benign prostate hyperplasia, h/o: history of, TR: transrectal ultrasound-guided prostate.

Table 2
Difference in the clinical course and baseline characteristics between ESBL negative and positive infection
Variable ESBL(-), n=22 ESBL(+), n=10 p-value
Age (yr) 63.8±10.6 60.3±6.6 0.25
PSA (ng/ml) 8.0±4.3 7.67±2.9 0.705
Prostate volume (g) 44.6±14.0 46.0±16.6 0.791
Prostate cancer 10 (45.5) 2 (20.0) 0.228
HTN 11 (50.0) 5 (50.0) >0.999
CHF 6 (27.3) 3 (30.0) >0.999
COPD 2 (9.1) 1 (10.0) >0.999
CKD 2 (9.1) 1 (10.0) >0.999
Liver disease 3 (13.6) 0 0.539
DM 9 (40.9) 3 (30.0) >0.999
Neurologic Dz 6 (27.3) 1 (10.0) 0.644
BPH medication 22 (100) 8 (80.0) 0.201
h/o Foley catheter insertion 2 (9.1) 1 (10.0) >0.999
Concomittant op 5 (22.7) 0 0.291
Usage of immnosupressant 2 (9.1) 0 >0.999
h/o Cephalosporin usage 2 (9.1) 1 (10.0) >0.999
h/o Fluoroquinolone usage 3 (13.6) 4 (40.0) 0.157
Post biopsy sepsis 18 (75.0) 9 (90.0) 0.644
Highest fever (℃) 39.0±0.79 39±0.75 0.88
Lowest SBP (mmHg) 101.9±12.37 89.7±12.52 0.023
Highest WBC (*10C µl) 10.9±220.1 15.2±8421.1 0.212
Highest ESR (mm/hr) 40±35.4 49.6±30.2 0.045
Highest CRP (mg/dl) 142.0±81.1 180.5±77.0 0.174
Fever duration (days) 6.3±7.4 5.80±3.4 0.541
Total adm duration (days) 10.7±7.5 9.80±1.9 0.328

Values are presented as mean±standard deviation or number (%).

Concomitant op means that TR biopsy was done during urologic surgery.

ESBL: extended-spectrum β-lactamase, PSA: prostate-specific antigen, HTN: hypertension, CHF: congestive heart failure, COPD: chronic obstructive pulmonary disease, CKD: chronic kidney disease, DM: diabetes mellitus, Neurologic Dz: neurologic diseases, such as a past cerebrovascular accident or spinal cord injury, BPH: benign prostate hyperplasia, h/o: history of, SBP: systolic blood pressure, WBC: white blood cell count, ESR: erythrocyte sedimentation rate, CRP: C-reactive protein, adm: hospital admission, TR: transrectal ultrasound-guided prostate.

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        Changes of Antimicrobial Resistance Causing Infections Following Transrectal Prostate Biopsy: Analysis of 10-Year Data
        Urogenit Tract Infect. 2021;16(3):55-60.   Published online December 31, 2021
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      Changes of Antimicrobial Resistance Causing Infections Following Transrectal Prostate Biopsy: Analysis of 10-Year Data
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      Fig. 1 (A-C) Incidence of antibiotic resistance infection by year. (A) Quinolone resistance (QR) incidence. (B) Extended-spectrum β-lactamase (ESBL) production incidence. (C) Concomitant QR and ESBL production.
      Changes of Antimicrobial Resistance Causing Infections Following Transrectal Prostate Biopsy: Analysis of 10-Year Data

      Baseline characteristics of the patients with infectious complications (n=39)

      Variable Value
      Age (yr) 63±9.62
      PSA (ng/ml) 7.63±3.71
      Prostate volume (g) 46.65±19.12
      Prostate cancer 6 (15.4)
      HTN 19 (48.7)
      CHF 10 (25.6)
      COPD 3 (7.7)
      CKD 3 (7.7)
      Liver disease 3 (7.7)
      DM 16 (41.0)
      Neurologic Dz 8 (20.5)
      BPH medication 34 (87.2)
      h/o Foley catheter insertion 4 (10.3)
      Concomittant op 7 (17.9)
      Usage of immunosuppressants 2 (5.1)
      h/o Cephalosporin usage 4 (10.3)
      h/o Fluoroquinolone usage 7 (17.9)
      Antibiotics treatment
      Ertapenem 21 (53.8)
      Cefotaxime 3 (7.7)
      Ciprofloxacin 7 (17.9)
      Amikacin+Ciprofloxacin 1 (2.6)
      Ceftriaxone 1 (2.6)
      Piperacillin/tazobactam 1 (2.6)
      Meropenem 4 (10.3)
      Cefpiramide 1 (2.6)

      Variable Values are presented as mean±standard deviation or number (%). Concomitant op means that TR biopsy was done during urologic surgery.

      PSA: prostate-specific antigen, HTN: hypertension, CHF: congestive heart failure, COPD: chronic obstructive pulmonary disease, CKD: chronic kidney disease, DM: diabetes mellitus, Neurologic Dz: neurologic diseases, such as a past cerebrovascular accident or spinal cord injury, BPH: benign prostate hyperplasia, h/o: history of, TR: transrectal ultrasound-guided prostate.

      Difference in the clinical course and baseline characteristics between ESBL negative and positive infection

      Variable ESBL(-), n=22 ESBL(+), n=10 p-value
      Age (yr) 63.8±10.6 60.3±6.6 0.25
      PSA (ng/ml) 8.0±4.3 7.67±2.9 0.705
      Prostate volume (g) 44.6±14.0 46.0±16.6 0.791
      Prostate cancer 10 (45.5) 2 (20.0) 0.228
      HTN 11 (50.0) 5 (50.0) >0.999
      CHF 6 (27.3) 3 (30.0) >0.999
      COPD 2 (9.1) 1 (10.0) >0.999
      CKD 2 (9.1) 1 (10.0) >0.999
      Liver disease 3 (13.6) 0 0.539
      DM 9 (40.9) 3 (30.0) >0.999
      Neurologic Dz 6 (27.3) 1 (10.0) 0.644
      BPH medication 22 (100) 8 (80.0) 0.201
      h/o Foley catheter insertion 2 (9.1) 1 (10.0) >0.999
      Concomittant op 5 (22.7) 0 0.291
      Usage of immnosupressant 2 (9.1) 0 >0.999
      h/o Cephalosporin usage 2 (9.1) 1 (10.0) >0.999
      h/o Fluoroquinolone usage 3 (13.6) 4 (40.0) 0.157
      Post biopsy sepsis 18 (75.0) 9 (90.0) 0.644
      Highest fever (℃) 39.0±0.79 39±0.75 0.88
      Lowest SBP (mmHg) 101.9±12.37 89.7±12.52 0.023
      Highest WBC (*10C µl) 10.9±220.1 15.2±8421.1 0.212
      Highest ESR (mm/hr) 40±35.4 49.6±30.2 0.045
      Highest CRP (mg/dl) 142.0±81.1 180.5±77.0 0.174
      Fever duration (days) 6.3±7.4 5.80±3.4 0.541
      Total adm duration (days) 10.7±7.5 9.80±1.9 0.328

      Values are presented as mean±standard deviation or number (%).

      Concomitant op means that TR biopsy was done during urologic surgery.

      ESBL: extended-spectrum β-lactamase, PSA: prostate-specific antigen, HTN: hypertension, CHF: congestive heart failure, COPD: chronic obstructive pulmonary disease, CKD: chronic kidney disease, DM: diabetes mellitus, Neurologic Dz: neurologic diseases, such as a past cerebrovascular accident or spinal cord injury, BPH: benign prostate hyperplasia, h/o: history of, SBP: systolic blood pressure, WBC: white blood cell count, ESR: erythrocyte sedimentation rate, CRP: C-reactive protein, adm: hospital admission, TR: transrectal ultrasound-guided prostate.

      Table 1 Baseline characteristics of the patients with infectious complications (n=39)

      Variable Values are presented as mean±standard deviation or number (%). Concomitant op means that TR biopsy was done during urologic surgery.

      PSA: prostate-specific antigen, HTN: hypertension, CHF: congestive heart failure, COPD: chronic obstructive pulmonary disease, CKD: chronic kidney disease, DM: diabetes mellitus, Neurologic Dz: neurologic diseases, such as a past cerebrovascular accident or spinal cord injury, BPH: benign prostate hyperplasia, h/o: history of, TR: transrectal ultrasound-guided prostate.

      Table 2 Difference in the clinical course and baseline characteristics between ESBL negative and positive infection

      Values are presented as mean±standard deviation or number (%).

      Concomitant op means that TR biopsy was done during urologic surgery.

      ESBL: extended-spectrum β-lactamase, PSA: prostate-specific antigen, HTN: hypertension, CHF: congestive heart failure, COPD: chronic obstructive pulmonary disease, CKD: chronic kidney disease, DM: diabetes mellitus, Neurologic Dz: neurologic diseases, such as a past cerebrovascular accident or spinal cord injury, BPH: benign prostate hyperplasia, h/o: history of, SBP: systolic blood pressure, WBC: white blood cell count, ESR: erythrocyte sedimentation rate, CRP: C-reactive protein, adm: hospital admission, TR: transrectal ultrasound-guided prostate.


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