摘要(英) | Prevalence of indwelling urinary catheter among hospitalized patients
and analysis of uropathogens and pattern of antimicrobial resistance associated with the use of urinary catheter
Purpose:
Indwelling urinary catheter has been frequently used to manage urinary retention or incontinence despite it might cause certain complications. In this study, we evaluated the prevalence of indwelling urine catheter among hospitalized patients in Taiwan. We also analyzed uropathogens and pattern of antimicrobial resistance associated with urinary catheter utilization. Information from this analysis can be used as reference in future care and treatment of patients.
Materials and Methods:
Using the files of inpatient expenditures by admissions, details of inpatient orders and registry for contracted medical facilities from the National Health Insurance Research Database, we estimated the overall and stratum specific prevalence of indwelling urinary catheter among hospitalized patients according to admitted department, geographic area and accreditation level of hospitals, age and gender of patients in 2003. The distribution of uropathogens and pattern of antimicrobial resistance were analyzed with the reports of all urine cultures from the laboratory of a regional hospital in 2004. Comparison was made to examine whether the use of urinary catheter may be associated with different uropathogens and pattern of antimicrobial resistance.
Results:
The overall prevalence of indwelling urinary catheter among all hospitalized patients was 14.1% in 2003. The prevalence among patients admitted to the department of internal medicine, surgery, orthopedic and gynecology and obstetric was estimated at 11.1%, 13.4%, 18.2% and 35.5% respectively. The prevalence among patients admitted to the department of internal medicine was 11.2% in medical centers, 10.4% in regional hospitals, and 11.9% in local hospitals. Geographic variation showed that the prevalence in northern, middle, southern and eastern part of Taiwan was 10.3%, 11.2%, 12.2% and 8.5% respectively. According to age and gender, the prevalence for male patients aged 50-59, 60-69, 70-79 and 80-89 years was estimated at 7.5%、11.6%、15.8% and 21.1%, respectively. The corresponding figures for female were 7.0%, 10.4%, 18.2% and 24.0%.
Analysis of uropathogens showed that Escherichia coli (36.8%) was the most common pathogen causing urinary tract infections of patients without indwelling urinary catheter, followed by non-E. coli Enterobacteriaceae (19.2%), Pseudomonas spp. (8.6%), and Enterococcus spp. (7.3%). Of the patients with indwelling urinary catheter, Escherichia coli (23.4%) was still the most common uropathogen, followed by non-E. coli Enterobacteriaceae (20.5%), Pseudomonas spp. (16.4%), and rare Gram negative bacilli (5.8%).
The resistance rates of Escherichia coli against sulfamethoxazole + trimethoprim (SXT) were high, ranging from 32.3% to 73.5%. Indwelling urinary catheter further increased the risk of resistance. With regarding to the resistance of Escherichia coli to other commonly prescribed antimicrobials, the resistance rates were higher against cefazoline(CZ), amoxicillin+clavulanic acid (AMC), ciprofloxacin (CIP) and gentamicin (GM); but relatively low against amikacin (AN), ceftazidime (CAZ) and imipenem (IPM). Indwelling urinary catheter may also increase the risk of resistance against nearly all antibiotics except IPM.
The resistance rate for non-E.coli Enterobacteriaceae against SXT was also high, especially among the patients with indwelling urinary catheter. Additionally, the resistance rates were also high against CZ and AMC, but low against IMP. Again, indwelling urinary catheter was also observed to increase risk of resistance. Pseudomonas spp. was observed to be highly resistant against AMC and was less likely to be resistant against AN, CAZ and IPM. However, indwelling urinary catheter did not seem to be able to increase the risk of resistance of Pseudomonas spp. The resistance rates were generally high for rare Gram negative bacilli against all tested antimicrobials except IPM. Moreover, indwelling urinary catheter did not increase much of the risk of resistance of Pseudomonas spp. and rare Gram negative bacilli.
With regard to concurrent resistance, it showed that concurrent resistance of SXT with CZ, AMC, CIP and GM, respectively was all significant for the Enterobacteriaceae including Escherichia coli. Concurrent resistance was particularly evident among patients with indwelling urinary catheter.
Conclusions:
In 2003, the prevalence of indwelling urinary catheter among all hospitalized patients and patients admitted to the department of internal medicine in Taiwan was 14.1% and 11.1% respectively. Indwelling urinary catheter not only increased the urinary tract infections caused by intrinsically more resistant pathogens such as Pseudomonas spp. and rare Gram negative bacilli, but also increased the risk of antimicrobial resistance of Enterobacteriaceae. This may lead to difficulty in treating patients. We recommended caution be exercised before using indwelling urinary catheter.
Keywords: urinary catheter, uropathogen, antimicrobial, resistance
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