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American Academy of Pediatrics
Article

Uropathogens and Pyuria in Children With Neurogenic Bladders

Catherine S. Forster, Nader Shaikh, Alejandro Hoberman and Elizabeth Jackson
Pediatrics May 2018, 141 (5) e20173006; DOI: https://doi.org/10.1542/peds.2017-3006
Catherine S. Forster
aDepartments of Pediatrics and
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Nader Shaikh
bDepartment of Pediatrics, Children’s Hospital of Pittsburgh, Pittsburgh, Pennsylvania
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Alejandro Hoberman
bDepartment of Pediatrics, Children’s Hospital of Pittsburgh, Pittsburgh, Pennsylvania
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Elizabeth Jackson
aDepartments of Pediatrics and
cSurgery, Cincinnati Children’s Hospital Medical Center, Cincinnati, Ohio; and
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Abstract

Video Abstract

BACKGROUND: A recent study revealed that specific uropathogens are associated with lower odds of pyuria in a general pediatrics population. Children with neurogenic bladders who require clean intermittent catheterization (CIC) frequently have pyuria. Our objective with this study was to determine if an association exists between pyuria and type of uropathogen in CIC-dependent children.

METHODS: We obtained urinalysis and urine culture results from electronic medical records from January 2008 through December 2014 for patients ≤18 years of age with neurogenic bladders managed at a single institution. Cultures without concurrent urinalyses were excluded from analysis, as were cultures that yielded no growth, fungal growth, or growth of unidentified mixed organisms. We used logistic regression to determine the association of pyuria and leukocyte esterase with specific uropathogens.

RESULTS: We included 2420 cultures in this analysis. The growth of Enterococcus on urine culture was associated with lower odds of both pyuria and leukocyte esterase. In contrast, the growth of more than 100 000 colony-forming units per milliliter of Proteus mirabilis was associated with increased odds of both pyuria and leukocyte esterase, and the growth of Pseudomonas aeruginosa was associated with increased odds of leukocyte esterase but not pyuria. Certain etiologies of neurogenic bladder, such as bladder exstrophy and cloacal malformations, were also associated with increased odds of pyuria compared with neurogenic bladder due to myelomeningocele.

CONCLUSIONS: In children with neurogenic bladders who require CIC, Enterococcus may grow in urine culture without pyuria or positive leukocyte esterase. Accordingly, urine cultures should be obtained in symptomatic children, regardless of urinalysis results.

  • Abbreviations:
    CI —
    confidence interval
    CIC —
    clean intermittent catheterization
    ICD-9 —
    International Classification of Diseases, Ninth Revision
    UTI —
    urinary tract infection
    VUR —
    vesicoureteral reflux
  • What’s Known on This Subject:

    The growth of Enterococcus in urine culture is associated with lower odds of pyuria in children with a normal genitourinary tract. Children with neurogenic bladders who require clean intermittent catheterization frequently have pyuria, which may confound this association.

    What This Study Adds:

    Enterococcus in urine culture from children with neurogenic bladders is associated with lower odds of pyuria. In a symptomatic child, urine culture should be performed regardless of the urinalysis results.

    Children with neurogenic bladders who require clean intermittent catheterization (CIC) frequently have bacteriuria. Routine urinalysis is often used at the point of care to diagnose a urinary tract infection (UTI). In a general pediatric population, specific uropathogens (eg, Enterococcus species, Klebsiella species, and Pseudomonas aeruginosa) were less likely to be associated with pyuria than Escherichia coli.1 However, children with neurogenic bladders who require CIC frequently have chronic urethral inflammation, which may confound the association between pyuria and uropathogens.2 Therefore, we sought to determine if the presence of pyuria was associated with specific uropathogens in children with neurogenic bladders.

    Methods

    We obtained urinalysis and urine culture results from electronic medical records between January 1, 2008, and December 31, 2014, for patients ≤18 years of age with neurogenic bladders managed at a single institution. We identified neurogenic bladder through the use of the following International Classification of Diseases, Ninth Revision (ICD-9) codes: neurogenic bladder (ICD-9 596.54), spina bifida (ICD-9 741), paraplegia (ICD-9 344.1), or quadriplegia (ICD-9 344). We then conducted a manual review of electronic medical records to ensure that patients were actively performing CIC during the study period. We excluded from analyses urine cultures with either no growth (n = 3259), fungal growth (n = 68), or growth of unidentified mixed organisms (n = 239), as well as cultures without concurrent urinalyses (n = 2779). Urine cultures were performed by using standard laboratory technique. The study was approved by the institutional review board.

    Definitions

    In this article, urinalysis refers to the combination of both urine dipstick and urine microscopy. At our institution, urine microscopy is performed only if the dipstick shows the presence of blood, protein, nitrites, or leukocyte esterase, or if the sample is from a patient <2 years of age whose urine sample is sent from the emergency department. We defined positive leukocyte esterase as either small, moderate, or large leukocyte esterase on urinalysis. We defined pyuria as ≥5 urinary white blood cells per high-powered field.3 We defined a positive urine culture result as ≥10 000 CFU/mL on a specimen obtained by catheter. We chose 10 000 CFU/mL rather than 50 000 CFU/mL as the threshold, because at our institution, bacterial growth of <100 000 CFU/mL was reported as being between 10 000 and 100 000 CFU/mL rather than a specific colony count for several years during the study period.

    Statistical Analysis

    We compared categorical data using χ2 tests or Fisher’s exact tests as appropriate and continuous data using a t test. We used logistic regression to determine the association between uropathogens and positive leukocyte esterase and pyuria. Covariates included in the model were etiology of neurogenic bladder, uropathogens, sex, hydronephrosis, vesicoureteral reflux (VUR) and the presence of a mitrofanoff. We ran the models using a cohort that included all cultures with growth ≥10 000 CFU/mL, as well as those ≥100 000 CFU/mL. All analyses were done in RStudio (version 0.99.902).

    Results

    We included 2420 cultures in this analysis. We found that 1651 patients had bacterial growth of ≥100 000 CFU/mL, 965 patients had bacterial growth between 10 000 and 100 000 CFU/mL, and 42 patients had bacterial growth of ≥10 000 CFU/mL. The cohort had a mean age of 11.2 (±4.5) years, included 61% girls, and was mostly white (72%) (Table 1). The most common etiologies of neurogenic bladder included myelomeningocele (35%), anorectal malformation (11%), and cloacal malformation (8%). The most frequently isolated uropathogen was E coli (37%), followed by Enterococcus species (14%), and Klebsiella species (11%). The remaining 38% include Acinetobacter, Aerococcus, Citrobacter, Staphylococcus species, Corynebacterium, Enterobacter, Globicatella, Morganella, Pantoea, Proteus, Providencia, Pseudomonas, Rothia, Serratia, and Streptococcus species. There was no difference in age, race, or etiology of neurogenic bladder between those with and without pyuria, although there was a higher proportion of girls among patients with no pyuria. There was also a high proportion of patients with a mitrofanoff and VUR in the pyuria group compared with the no pyuria group but no difference in the proportion of patients with hydronephrosis (Table 1).

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    TABLE 1

    Demographics and Etiology of Neurogenic Bladder in Patients With Bacteriuria According to the Presence of Pyuria

    For the model including cultures with growth ≥10 000 CFU/mL, male sex, presence of a mitrofanoff, and presence of VUR were associated with pyuria (Table 2). The growth of Enterococcus species as well as other causes of neurogenic bladder was associated with decreased odds of pyuria; no uropathogens were associated with increased odds of pyuria (Table 2). In the model that included only cultures with ≥100 000 CFU/mL, male sex, growth of Proteus mirabilis, tethered cord, cloacal malformation, presence of a mitrofanoff and VUR were associated with increased odds of pyuria (Table 2).

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    TABLE 2

    Association Between Sex, Uropathogen Type, and Etiology of Neurogenic Bladder and Pyuria

    For the model including cultures with growth ≥10 000 CFU/mL, male sex, cloacal malformation, the presence of a mitrofanoff, and VUR were associated with the presence of leukocyte esterase, whereas the presence of a spinal cord injury was associated with decreased odds of leukocyte esterase. The growth of P mirabilis was associated with increased odds, whereas the growth of Enterococcus species was associated with decreased odds of leukocyte esterase. Similar patterns were seen for the model that included ≥100 000 CFU/mL, with the exception that spinal cord injury was not associated with increased odds of leukocyte esterase (Table 3).

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    TABLE 3

    Association Between Sex, Uropathogen, Etiology of Neurogenic Bladder, and Leukocyte Esterase

    A total of 2779 cultures were excluded from analysis because they did not have urinalysis performed at the time of urine culture. A total of 244 cultures were not included in the model for the outcome of pyuria because they did not have urine microscopy performed along with the dipstick. Children with Enterococcus and Enterobacter species in their culture using 100 000 CFU/mL as a cutoff for defining a positive culture result were more likely not to have urine microscopy performed than children with E coli.

    Discussion

    In children who require CIC for neurogenic bladder, the growth of Enterococcus species on urine culture was associated with lower odds of both microscopic pyuria and leukocyte esterase. In contrast, the growth of P mirabilis was associated with increased odds of both pyuria and leukocyte esterase. We also found that certain etiologies of neurogenic bladder, such as cloacal malformations, were associated with increased odds of pyuria (in the presence of bacteriuria) compared with neurogenic bladder due to myelomeningocele. Additionally, the presence of both a mitrofanoff and VUR was associated with increased odds of both pyuria and leukocyte esterase, whereas the presence of hydronephrosis did not significantly impact the risk of either of these outcomes.

    Children with neurogenic bladder who require CIC frequently have bacteriuria.4 The results of routine urinalyses are frequently used to determine if empirical antibiotics are warranted before the availability of urine culture results. Although timely initiation of antibiotics can prevent the progression of infection and decrease the risk of renal scars,5 unnecessary antimicrobial agents contribute to the emergence of bacterial resistance. In the absence of more accurate biomarkers of infection to help antibiotic selection, understanding the limitations of the routine urinalysis in predicting specific uropathogens is necessary. Because screening tests, such as the urine dipstick, may be used to determine if a culture is performed, it is important to realize that the lack of leukocyte esterase or pyuria may not be helpful in deciding which urine samples to culture.

    The presence of pyuria in a general pediatrics population, in combination with clinical signs and symptoms, is highly suggestive of UTI.6 However, pyuria frequently occurs among children with neurogenic bladder.7 The authors of the Infectious Disease Society of America guidelines for the diagnosis of catheter-associated UTI do not consider the presence of pyuria to be diagnostic of UTI in patients who require CIC.8 The presence of pyuria in this population is multifactorial; chronic inflammation may result from frequent catheterization9 as well as from changes in the underlying genitourinary epithelium. However, in this cohort, only the presence of cloacal malformation was associated with pyuria, suggesting that this condition has a more robust response to bacteriuria. Bladder exstrophy also has an elevated odds ratio and confidence interval (CI) close to statistical significance. However, there were relatively few cultures from patients with bladder exstrophy in our cohort, suggesting a likely association between bladder exstrophy and pyuria that we may not have had sufficient statistical power to detect in this cohort. Biopsy studies of patients with bladder exstrophy reveal the presence of chronic inflammation in the urothelium already present at the time of primary closure.9 The pathophysiology underlying the association of pyuria with cloacal malformations remains to be elucidated. Given that the urothelium plays a critical role in the neural control of the bladder,10 a neuroimmunologic etiology may explain the association between pyuria and cloacal malformations (and likely bladder exstrophy) because defects in epithelial differentiation have been implicated in the pathogenesis of cloacal malformations.11 Regardless of the etiology of neurogenic bladder, chronic inflammation in CIC-dependent children likely confounds the utility of pyuria to predict either a positive urine culture result or a specific uropathogen. Despite this, enterococcal bacteriuria remains associated with a decreased risk of pyuria compared with E coli while controlling for the etiology of neurogenic bladder.

    In addition to the association between specific etiologies of neurogenic bladder and pyuria, an association exists between boy sex and pyuria. There are several possible explanations for this finding. Olson et al12 have demonstrated that male mice are more likely to develop chronic inflammation and persistent bacteriuria after UTI compared with female mice, an association that may be mediated by androgen exposure. In addition, there are several specific etiologies of neurogenic bladder that are only present in boys (eg, posterior urethral valves), or have a male predominance (eg, Eagle-Barrett syndrome). However, the number of patients in this cohort with these conditions were relatively small and unlikely to have caused this effect. In addition, no authors of previous reports have identified associations of these syndromes with pyuria. Although the association between male sex and pyuria may be due to androgen exposure, it is possible that additional unidentified mediators may contribute to this finding.

    The presence of a mitrofanoff and VUR, but not hydronephrosis, is also associated with increased odds of pyuria and leukocyte esterase. The association between the mitrofanoff and pyuria is likely explained by the chronic inflammation associated with catheterization through a conduit without urothelium. The association between VUR and pyuria is potentially mediated through an inflammatory response of the kidney to previous infections; dimercaptosuccinic acid scans reveal inflammatory changes in the kidney up to 6 weeks after UTI in children with VUR.13 Although there is a component of inflammation associated with both the presence of a mitrofanoff and VUR, that was not the case for hydronephrosis (generally not an inflammatory process) explaining the lack of association with pyuria we found. We chose not to add bladder augmentation into the models in this work because the majority of children with a catheterizable conduit (eg, mitrofanoff) also undergo bladder augmentation,14 and, therefore, by including both the presence of mitrofanoff and bladder augmentation, we would be introducing collinearity into the model.

    Our results reveal that the growth of Enterococcus species in urine culture is associated with a decreased risk of both pyuria and leukocyte esterase. However, our data likely represent an underestimation of the association with pyuria. A disproportionate number of cultures with growth of Enterococcus species did not have urine microscopy performed on them because of the lack of leukocyte esterase and/or nitrites, and were, therefore, not included in the regression model for the outcome of pyuria. Indeed, in our cohort, 255 of the 375 patients (68%) without leukocyte esterase on urinalysis who did have urine microscopy performed on them also lacked pyuria, suggesting that the majority of cultures excluded for the lack of urine microscopy likely also did not meet the criteria for pyuria. Despite this potential underestimation, the association between Enterococcus species and the absence of pyuria is present in our cohort, a finding consistent with previous reports in the general pediatrics population.1 The authors of a previous report who investigated the association with pyuria and uropathogens in catheter-dependent patients found that the association between pyuria and UTI is stronger for Gram-negative bacilli compared with Gram-positive cocci (ie, Enterococcus).15 This relationship has not been fully examined in the children with neurogenic bladder. The reason behind the negative association between Enterococcus species and pyuria is unclear. Neutrophils have a critical role in controlling infections due to Enterococcus faecalis.16 Mouse models of catheterization have revealed a significant increase in neutrophils in the urine after inoculation with E faecalis,16 suggesting that blunting of neutrophil recruitment is not the mechanism. Lack of concordance between the known pathophysiology of enterococcal infections and our findings suggests additional aspects relevant to UTI because of Enterococcus in this population that have not been identified.

    Limitations of our study include our inability to differentiate between UTI and asymptomatic bacteriuria because of the lack of sufficient clinical information to make this distinction. No validated criteria exist to define UTI in this population.17 In addition, the reason that the culture was obtained (eg, for clinical suspicion of UTI versus routine surveillance) was also not available, which could have served as a proxy measure for the presence or absence of clinical symptoms. However, our previous work has shown that pyuria alone is not a good predictor of UTI in children with neurogenic bladder,7 suggesting that the presence of pyuria may be more related to the presence of a specific pathogen rather than indicative of an infectious state. A second limitation includes our inability to use a cutoff of ≥50 000 CFU/mL for defining a positive urine culture result. However, our results are largely the same when a cutoff of ≥100 000 CFU/mL is used as when a cutoff of ≥10 000 CFU/mL is used. Lastly, our work was retrospective in nature and limited to 1 center.

    Conclusions

    We show that the presence of Enterococcus species in urine culture from children with neurogenic bladders who require CIC is associated with a lower likelihood of pyuria compared with E coli, controlling for sex, race, etiology of neurogenic bladder, presence of a mitrofanoff, hydronephrosis, and VUR. With these results, we suggest that the current markers of UTI evidenced on urinalysis and urine microscopy are insufficient for predicting bacteriuria in this population. More specific biomarkers of UTI are needed in this unique patient population. In the symptomatic child at risk for UTI, urine culture should be performed irrespective of the results of the urinalysis.

    Footnotes

      • Accepted January 31, 2018.
    • Address correspondence to Catherine S. Forster, MD, MS, 111 Michigan Ave NW, Suite 4800, Washington, DC 20011. E-mail: csforster{at}childrensnational.org
    • FINANCIAL DISCLOSURE: The authors have indicated they have no financial relationships relevant to this article to disclose.

    • FUNDING: Dr Forster received research training support from the National Institutes of Health through a National Research Service Award Institutional Training Grant, T32 Health Resources and Services Administration 09-046 Community for Federal Domestic Assistance 93.186.

    • POTENTIAL CONFLICT OF INTEREST: The authors have indicated they have no potential conflicts of interest to disclose.

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    Uropathogens and Pyuria in Children With Neurogenic Bladders
    Catherine S. Forster, Nader Shaikh, Alejandro Hoberman, Elizabeth Jackson
    Pediatrics May 2018, 141 (5) e20173006; DOI: 10.1542/peds.2017-3006

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    Uropathogens and Pyuria in Children With Neurogenic Bladders
    Catherine S. Forster, Nader Shaikh, Alejandro Hoberman, Elizabeth Jackson
    Pediatrics May 2018, 141 (5) e20173006; DOI: 10.1542/peds.2017-3006
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