Clinical Features for the Diagnosis of Pediatric Urinary Tract Infections: Systematic Review and Meta-Analysis

Urine Testing in Children with Viral Symptoms: A Nationwide Analysis of Ambulatory Visits, 2014-2019

OBJECTIVE

To evaluate the extent of and factors associated with urine testing in US pediatric ambulatory visits for symptoms commonly associated with viral illness.

STUDY DESIGN

We analyzed a nationally representative, cross-sectional sample of ambulatory clinic and emergency department (ED) visits among children 2 months to 17 years old (2014 through 2019 National Ambulatory Medical Care Survey and National Hospital Ambulatory Medical Care Survey). Using reason for visit classification codes, we identified visits for respiratory symptoms, diarrhea, or rash; termed "viral symptoms" without reported localizing genitourinary symptoms. We assessed the proportion of these visits with urine testing (urinalysis and/or urine culture) and evaluated factors associated with urine testing using logistic regression.

RESULTS

Of 71.3 million (95% CI 64.7-78.0 million) pediatric ambulatory visits per year, 61% (95% CI 59%-63%) were for viral symptoms without reported genitourinary symptoms. Urine testing at these visits accounted for 38% (95% CI 30%-47%) of overall urine testing. Such testing occurred more frequently at ED visits (8.3%; 95% CI 7.4%-9.3%) compared with clinic visits (4.4%; 95% CI 2.5%-7.7%). At ED visits, the adjusted probability of urine testing in the context of viral symptoms was lowest for males age 2 months to <2 years (5%; 95% CI 3%-6%) and highest for females age 12 through 17 years (20%; 95% CI 16%-24%), and females age 6-11 years (13%; 95% CI 11%-16%).

CONCLUSIONS

Urine testing in children with symptoms of viral or other non-urinary tract infection illnesses occurs frequently at ambulatory visits. This potentially avoidable testing disproportionately occurred in older age groups that have lower risk of urinary tract infection.

Noninferiority of Multiplex Polymerase Chain Reaction Compared to Standard Urine Culture for Urinary Tract Infection Diagnosis in Pediatric Patients at Hackensack Meridian Health Children's Hospital Emergency Department

Objective

To establish the noninferiority of the rapid and sensitive multiplex polymerase chain reaction (M-PCR) method versus standard urine culture (SUC) in pediatric urinary tract infection (UTI) diagnostic testing.

Methods

A United States of America (USA)-based single-center prospective observational study of 44 female and four male patients aged 3-21 years old presenting to a Pediatric Emergency Department in New Jersey with clinically suspected UTI. Urine specimens were primarily collected via midstream voiding. Patients with antibiotic exposure within the week prior to presentation were excluded. Patient demographic data, clinical manifestations, and urinalysis results were recorded. Noninferiority testing comparing M-PCR and SUC was conducted using a method for paired binary data, with a noninferiority margin set at 5%. Noninferiority was concluded if the lower bound of the 95% confidence interval of the difference in detection rates between M-PCR and SUC lies entirely to the right of the value minus the noninferiority margin. All statistical calculations were performed using Python 3.10.12.

Results

The two methods were concordant in two-thirds of cases. Of the 14 M-PCR-positive/SUC-negative discordant specimens, 13 (93%) contained a fastidious and/or emerging uropathogen (A. urinae, A. schaalii, G. vaginalis, C. riegelii, U. urealyticum, Viridans group Streptococci (VGS), and/or Coagulase-negative Staphylococci (CoNS)). Neither symptom presentation nor urinalysis results differed significantly between participants with concordant positive results for UTI diagnosis and those with concordant negative results (non-UTI group).

Conclusion

In this pediatric population, similar to previous findings in an older adult population, M-PCR established not only noninferiority but also superiority over SUC in detecting microorganisms in the urine.

Improving the diagnosis of urinary tract infections by the use of enriched media and a 48-hour incubation period

Introduction. The absence of a gold-standard methodology for the microbiological diagnosis of urinary tract infections (UTI) has led to insufficient standardization of criteria for the interpretation of results and processing methods, particularly incubation time and culture media.Hypothesis. 48-hour incubation time period and use of blood agar enhances the sensitivity of microorganisms isolated significantly.Aim. To determine the sensitivity of blood agar and Brilliance UTI chromogenic agar, incubating for different periods (24-48 hours), for the detection of positive urine cultures.Methodoloy. Comparisons were made between all possible combinations of media and incubation times. As the gold-standard reference, we used the routine methodology of our laboratory, which involves prior screening with available clinical data, flow cytometry, sediment analysis and/or Gram staining. Screened samples were then cultured on blood agar and chromogenic agar and incubated for 48 hours. Also, based on the results of Gram staining, additional media were added in selected cases.Results. The most significant difference was found between chromogenic agar incubated for 24 hours and blood agar incubated for 48 hours, with the latter method allowing the recovery of 10.14 % more microorganisms (P < 0.0001). Furthermore, the value of performing Gram staining to guide processing was demonstrated, as it avoided the loss of at least 5.14 % of isolates.Conclusions. At least in urological and nephrological patients it is essential to include enriched culture media (blood agar) or to extend the incubation times due to the improvement of the diagnostic sensitivity of urine cultures. Gram staining also can help detect the presence of fastidious microorganisms or mixed infections, indicating whether rich and/or selective media should be included to enhance the diagnostic sensitivity of cultures. If this methodology is not followed, it should be noted that besides fastidious species, fastidious strains of Escherichia coli, Proteus mirabilis, Pseudomonas aerugniosa and Stenotrophomonas maltophilia will also be missed.

Effect of Probiotics on Urinary Tract Infections in Children: A Systematic Review and Meta-Analysis

BACKGROUND

Urinary tract infections (UTIs) are the most prevalent bacterial infections that occur in children worldwide.

OBJECTIVE

This meta-analysis aims to investigate the utility of probiotics as preventive therapy in children with a UTI.

METHODS

The Web of Science, PubMed, and Scopus were searched for articles that investigated the relationship between probiotic consumption and the risk of UTIs. The quality of the articles was evaluated using the Jadad scale. The pooled odds ratio (OR) and 95% confidence interval (CI) were calculated using a random-effects model. Subgroup analyses and sensitivity analyses were also conducted. The Cochran Q test and the statistic I2 were used to evaluate heterogeneity. To determine any potential publication bias, the Egger's and Begg's tests were used.

RESULTS

In total, eleven studies were selected for the systematic review and meta-analysis. Compared to children who did not receive probiotics, the OR of developing or having a recurring urinary tract infection in those who received probiotics was 0.94 (95% CI; 0.88-0.999; p-value=0.046). The Begg's and Egger's tests showed no evidence of publication bias between probiotics and the risk of developing new or recurring urinary tract infections.

CONCLUSION

Based on this systematic review and meta-analysis, probiotics could be an alternative therapy for children who are at risk of developing a UTI. They are non-pharmaceutical options and could be used as natural prophylaxis for UTIs. However, the currently published evidence does not irrefutably confirm that probiotics provide a protective effect against urinary bacterial infections. Therefore, there need to be large-scale randomized clinical trials undertaken to investigate the possible prophylaxis of probiotics.

Incidence rates and trends of childhood urinary tract infections and antibiotic prescribing: registry-based study in general practices (2000 to 2020)

Background

To improve the management of childhood urinary tract infections, it is essential to understand the incidence rates, testing and treatment strategy.

Methods

A retrospective study using data from 45 to 104 general practices (2000 to 2020) in Flanders (Belgium). We calculated the incidence rates (per 1000 person-years) of cystitis, pyelonephritis, and lab-based urine tests per age (< 2, 2-4, 5-9 and 10-18 years)) and gender in children and performed an autoregressive time-series analysis and seasonality analysis. In children with UTI, we calculated the number of lab-based urine tests and antibiotic prescriptions per person-year and performed an autoregressive time-series analysis.

Results

There was a statistically significant increase in the number of UTI episodes from 2000 to 2020 in each age group (p < 0.05), except in boys 2-4 years. Overall, the change in incidence rate was low. In 2020, the incidence rates of cystitis were highest in girls 2-4 years old (40.3 /1000 person-years 95%CI 34.5-46.7) and lowest in boys 10-18 (2.6 /1000 person-years 95%CI 1.8-3.6) The incidence rates of pyelonephritis were highest in girls 2-4 years (5.5, 95%CI 3.5-8.1 /1000 person-years) and children < 2 years of age (boys: 5.4, 95%CI 3.1-8.8 and girls: 4.9, 95%CI 2.7-8.8 /1000 person-years). In children 2-10 years, there was an increase in number of lab-based urine tests per cystitis episode per year and a decrease in total number of electronic antibiotic prescriptions per cystitis episode per year, from 2000 to 2020. In children with cystitis < 10 years in 2020, 51% (95%CI 47-56%) received an electronic antibiotic prescription, of which the majority were broad-spectrum agents.

Conclusions

Over the last 21 years, there was a slight increase in the number of UTI episodes diagnosed in children in Flemish general practices, although the overall change was low. More targeted antibiotic therapy for cystitis in accordance with clinical guidelines is necessary to reduce the use of broad-spectrum agents in children below 10 years.

Supplementary Information

The online version contains supplementary material available at 10.1186/s12875-022-01784-x.

Point-of-care tests for pediatric urinary tract infections in general practice: a diagnostic accuracy study

BACKGROUND

Early diagnosis of pediatrics urinary tract infections in the outpatient settings is challenging but essential to prevent hospitalization and kidney damage.

OBJECTIVE

We aimed to evaluate the diagnostic test accuracy of a selection of point-of-care tests for pediatric urinary tract infections in general practice.

METHODS

A prospective cross-sectional study in 26 general practices in Flanders, Belgium (clinicaltrials.gov, NCT03835104). Urine was sampled systematically from children between 3 months to 18 years presenting with an acute illness of maximum 10 days. Samples were analyzed at the central laboratory with a routine dipstick test, the Utriplex test, the Uriscreen test and the Rapidbac as index tests, and with urine culture showing more than 105 colony-forming units per milliliter of one pathogen as reference standard. For each test, we calculated sensitivity, specificity, positive and negative likelihood ratios, and predictive values with 95% confidence intervals.

RESULTS

Three-hundred urine samples were available for analysis of which 30 samples were culture positive (10%). Sensitivities and specificities were 32% (95% CI 16%-52%) and 86% (95% CI 82%-90%) for the dipstick test, 21% (95% CI 8%-40%) and 94% (95% CI 91%-97%) for the Utriplex test, 40% (95% CI 16%-68%) and 83% (95% CI 75%-88%) for the Rapidbac test, and 67% (95% CI 38%-88%) with 69% (95% CI 60%-76%) for the Uriscreen test.

CONCLUSION

All 4 point-of-care tests were suboptimal for use in the broad range of children presenting with acute illnesses to general practice. General practitioners need novel methods for obtaining reliable urine samples during the time of the consultation, especially for children not yet toilet-trained.

GPs' perspectives on diagnosing childhood urinary tract infections: a qualitative study

BACKGROUND

Diagnosis and management of childhood urinary tract infection (UTI) is challenging in general practice because of a range of factors.

AIM

To explore GPs' perspectives concerning the barriers to and facilitators for diagnosis and management of childhood UTI.

DESIGN AND SETTING

Qualitative study in general practice in Belgium.

METHOD

Semi-structured interviews with 23 GPs from January 2021 to June 2021 were carried out. Interviews were video-recorded and audio-recorded, transcribed verbatim, and analysed using a thematic approach.

RESULTS

The barriers to early diagnosis of UTI were the assumption of low UTI prevalence and aspecific presentation of UTI in children, difficulties in urine collection, and diagnostic uncertainty. All GPs indicated that they sampled urine in either children with specific UTI features (for example, dysuria, abdominal pain) or unexplained fever. Facilitators for UTI screening were instructional material for parents, skill training for GPs, additional nursing staff, novel non-invasive convenient collection methods, online decision support informing parents when to bring a urine sample to the consultation, and an accurate, easy-to-use point-of-care test for UTI. Empirical antibiotic treatment was initiated based on dipstick test results, clinical features suggestive of UTI, severity of illness, gut feeling, long duration of fever, time of the day, and parents' ability to judge disease severity.

CONCLUSION

The assumption of a low UTI prevalence, absence of obvious UTI features, and difficult urine sampling might cause childhood UTIs to go undetected in general practice. Diagnostic uncertainty makes appropriate treatment challenging.

Management of antibacterial therapy of infectious and inflammatory diseases of the urinary tract in children and regional peculiarities during the COVID-19 pandemic

Urinary tract infections (UTIs) remain an urgent issue in clinical pediatrics. Empirical selection of antibacterial therapy becomes more complicated, and antibacterial drug indication is not always clinically substantiated. This study aimed to compare the antibacterial susceptibility pattern of the main group of urinary tract infectious agents from 2009–2016 with intermediate results from 2020–2021, during the COVID-19 pandemic, among children in the Chernivtsi region. Urine samples were collected from 3089 children (0–17 years old) treated at the health care institutions in the Chernivtsi region (2009–2016). The clinical-laboratory examination of 177 children (0–17 years old) was carried out from 2020 to 2021. The children received specialized medical care at the Department of Nephrology. Preliminary data of regional monitoring (2020–2021) are not considerably different from the previous regional susceptibility of antibiotics: to penicillin (p<0.01), ІІ-ІІІ generation cephalosporin (p<0.01); an increased resistance to levofloxacin (χ²=4,338; p<0.01), tetracycline – χ²=7,277; p<0.01; doxycycline – χ²=5,309; p<0.01) and imipenem – χ²=5,594; p<0.01). The data obtained did not explain an increased resistance to fluoroquinolones completely (ofloxacin, pefloxacin, ciprofloxacin), except for levofloxacin (χ²=4,338; p<0.01). A reliable difference of susceptibility of tetracycline group was registered (tetracycline – χ²=7,277; p<0.01; doxycycline – χ²=5,309; p<0.01). Furthermore, there was a regional increase in some UTI-pathogen strains resistant to carbapenems (imipenem – χ²=5,594; p<0.01). The use of antibiotics from the group of penicillins and II-III generation cephalosporins as the starting antibacterial therapy for STIs during the COVID-19 pandemic should be justified. A regional increase (2020–2021) of some uropathogenic strains resistant to carbapenems administered to treat severe bacterial infections requires their exclusively designated purpose in everyday pediatric practical work.

Design and Optimization of Urinary Real-Time Nursing Model Based on Medical Internet of Things

The medical Internet of Things (IoTs) can bind intelligent sensing devices with urinary nursing recipients and integrate information into various hospital information systems through network communication, so as to realize the intelligent perception, data collection, remote monitoring, information sharing, and other functions of urinary real-time nursing recipients. The urinary real-time nursing model can complete the expansion of hospital information system data to the bedside and the instant exchange of terminal data with the system through the medical IoTs and wireless local area network. Based on the summary and analysis of previous research results, this paper expounds on the research status and significance of the urinary real-time nursing model, elaborates on the development background, current status, and future challenges of medical IoTs, introduces the methods and principles of medical IoTs level evaluation system and transformation rules-based optimization algorithm, conducts urinary real-time nursing model design based on medical IoTs, analyzes model hardware design based on medical IoTs, performs model software design based on medical IoTs, proposes the urinary real-time nursing model optimization based on medical IoTs, explores the front-end function optimization of the urinary real-time nursing, implements the system program optimization of the urinary real-time nursing, discusses the hierarchical architecture of the urinary real-time nursing model, and finally carries out the role function analysis of the medical IoTs in the urinary real-time nursing model. The study results show that the urinary real-time nursing model based on medical IoTs can accurately and efficiently identify, manage, and integrate clinical nursing procedures and data such as patients, diagnoses, drugs, and can optimize nursing workflow, strengthen quality control, and improve nursing efficiency and provide patients with more convenient nursing services. The research results of this paper provide a reference for further research on the design and optimization of urinary real-time nursing model based on medical IoTs.

Clinical prediction rules for childhood UTIs: a cross-sectional study in ambulatory care

Background

Diagnosing childhood urinary tract infections (UTIs) is challenging. Clinical prediction rules may help to identify children that require urine sampling. However, there is a lack of research to determine the accuracy of the scores in general practice.

Aim

To validate clinical prediction rules (UTI Calculator [UTICalc], A Diagnosis of Urinary Tract Infection in Young Children [DUTY], and Gorelick score) for paediatric UTIs in primary care.

Design & setting

Post-hoc analysis of a cross-sectional study in 39 general practices and two emergency departments (EDs). The study took place in Belgium from March 2019–March 2020.

Method

Physicians recruited acutely ill children aged ≤18 years and sampled urine systematically for culture. Per rule, an apparent validation was performed, and sensitivities and specificities were calculated with 95% confidence intervals (CIs) per threshold in the target group. For the DUTY coefficient-based algorithm, a logistic calibration was performed and the area under the receiver operating characteristic curve (AUC) was calculated with 95% CI.

Results

Of 834 children aged ≤18 years recruited, there were 297 children aged <5 years. The UTICalc and Gorelick score had high-to-moderate sensitivity and low specificity: UTICalc (≥2%) 75% and 16%, respectively; Gorelick (≥2 variables) 91% and 8%, respectively. In contrast, the DUTY score ≥5 points had low sensitivity (8%) but high specificity (99%). Urine samples would be obtained in 72% versus 38% (UTICalc), 92% versus 38% (Gorelick) or 1% versus 32% (DUTY) of children, compared with routine care. The number of missed infections per score was 1/4 (UTICalc), 2/23 (Gorelick), and 24/26 (DUTY). The UTICalc + dipstick model had high sensitivity and specificity (100% and 91%), resulting in no missed cases and 59% (95% CI = 49% to 68%) of antibiotics prescribed inappropriately.

Conclusion

In this study, the UTICalc and Gorelick score were useful for ruling out UTI, but resulted in high urine sampling rates. The DUTY score had low sensitivity, meaning that 92% of UTIs would be missed.

Pediatric kidney transplant recipients with and without underlying structural kidney disease have a comparable risk of hospitalization associated with urinary tract infections

INTRODUCTION

Urinary tract infections (UTIs) are a common and potentially serious kidney transplant complication. Pediatric kidney transplants are potentially at increased risk for UTIs when structural kidney disease is the underlying end-stage kidney disease (ESKD) etiology. The objective of this manuscript is to determine if children with structural kidney disorders are more prone to UTIs post kidney transplant.

MATERIALS AND METHODS

Hospitalizations for pediatric kidney transplant recipients were retrospectively reviewed over a 4-year period for UTIs in the diagnostic codes. The patient's age, sex, graft age, underlying diagnosis for cause of ESKD, symptoms at presentation, urinalysis results, and urine culture results were recorded. UTI rates, febrile UTI rates, and UTI rates in the 1st year post-transplant were compared between children with ESKD due to structural vs. non-structural kidney disease.

RESULTS

Overall, 62 of 145 pediatric patients with kidney transplants accounted for 182 hospitalizations for kidney transplant complications over the 4-year study period. UTIs were components of 34% of the hospitalizations. Overall, UTI rates, febrile UTI rates, and UTI rates for the 1st year post kidney transplant were comparable for children with vs. without structural ESKD etiologies.

CONCLUSION

Urinary tract infections are frequent components of hospitalizations for pediatric kidney transplant recipients. Children with and without structural kidney disease as an ESKD etiology have similar UTI rates indicating that UTI susceptibility is primarily due to the transplant process and/or medication regimens. UTIs represent a potentially modifiable risk factor for pediatric kidney transplant complications.