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Model for predicting high-grade vesicoureteral reflux in young children presenting with febrile urinary tract infection

  • Anuvat Klubdaeng
    Affiliations
    Division of Nephrology, Department of Pediatrics, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand
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  • Thanaporn Chaiyapak
    Affiliations
    Division of Nephrology, Department of Pediatrics, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand
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  • Achra Sumboonnanonda
    Affiliations
    Division of Nephrology, Department of Pediatrics, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand
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  • Nuntawan Piyaphanee
    Correspondence
    Correspondence to: N. Piyaphanee, MD, Division of Nephrology, Department of Pediatrics, Faculty of Medicine Siriraj Hospital, Mahidol University 2 Wanglang Road, Bangkoknoi, Bangkok 10700, Thailand, Tel.: +66 2 419 5660; Fax.: +66 2 419 5960
    Affiliations
    Division of Nephrology, Department of Pediatrics, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand
    Search for articles by this author

      Summary

      Introduction

      High-grade vesicoureteral reflux (VUR) is associated with long-term renal outcome, and can be missed if voiding cystourethrogram (VCUG) is not performed. The current febrile urinary tract infection (UTI) guidelines have narrowed down the indications for VCUG. This study aimed to determine the predictors and develop a model to predict high-grade VUR (grade III-V) in young children presenting with febrile UTI.

      Methods

      We retrospectively reviewed 324 children aged 2–60 months who presented with first or recurrent febrile UTI and underwent both renal and bladder ultrasonography (RBUS) and VCUG during 2004–2013. Multivariate logistic regression was used to identify independent predictors of high-grade VUR, and a predictive model and scoring system were developed. Sensitivity and specificity of the predictors were evaluated.

      Results

      Sixty-two (67.4%) of 92 children with VUR were high-grade VUR. The independent risk factors for high-grade VUR were recurrent UTI (p < 0.001), non-Escherichia coli (non-E. coli) pathogen (p = 0.011), and abnormal RBUS (p < 0.001) including pelvicalyceal dilation only (p = 0.003), and with ureteric dilation (p < 0.001). Abnormal RBUS showed highest sensitivity (58.1%), while ureteric dilation had highest specificity (96.6%) to predict high-grade VUR. Combination of these predictors improved the specificity but decreased the sensitivity. The prediction score was calculated, as follows: recurrent UTI = 3 points + non-E. coli = 1 point + pelvicalyceal dilation only = 1 point + pelvicalyceal and ureteric dilation = 3 point. A cutoff score of 1 showed sensitivity of 82.3% and specificity of 63.7%. The specificity would increase (87.8, 92.7, 97.7, 100, 100, and 100%) for higher scores of 2, 3, 4, 5, 6 and 7, respectively.

      Discussion

      High-grade VUR could be predicted by simple model using single or combined predictors. Sensitivity and specificity varied according to each predictor. The specificity of ureteral dilation was as high as recurrent UTI. The weighing score for each presenting predictor and the summation of the scores provided more detailed in sensitivity and specificity.

      Conclusions

      Children with febrile UTI who have the predictor(s) of high-grade VUR are recommended to undergo VCUG. The high-grade VUR prediction score may help for decision-making regarding whether to perform VCUG in a particular child.

      Keywords

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      Linked Article

      • Commentary to model for predicting high -grade vesicoureteral reflux in young children presenting with febrile urinary tract infection
        Journal of Pediatric UrologyVol. 18Issue 4
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          The authors employ three well known imaging and clinical risk factors associated with vesicoureteral reflux (recurrent UTI, non-E. coli pathogen, abnormal renal and bladder ultrasound) to create a scoring system for limiting the use of a VCUG in all children who present with a febrile UTI. It is no surprise that the presence of any one of these factors alone identifies an appreciable number of children with high grade (III–V) reflux. The authors, along with the American Academy of Pediatrics and the British National Institute for Clinical Excellence, have striven to reduce the use of the VCUG and are content with missing some with reflux and renal scarring.
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