Short communication: A pilot study to determine safety and feasibility of a commercial enuresis alarm to detect voiding in infants

Accurate measurement of post-void residual (PVR) volumes requires accurate determination of the timing of voiding, which is challenging in non-verbal patients. As a proof of principle, we sought to test the feasibility, safety and efficacy of using an enuresis alarm to indicate voiding in ten infants. Each infant was observed for 4 h with alarm in the diaper, and diapers checked every 15-30 min to confirm voiding. The alarm activated in 31 of 33 voids (93.9%). No adverse events occurred. Further work will investigate whether this approach may improve accuracy of PVR measurement.

Factors contributing to telemedicine efficacy in pediatric urology

INTRODUCTION

Despite swift implementation of telemedicine with the coronavirus disease 2019 pandemic, there is a paucity of research on its use for management of pediatric urology patients. Specifically, there is limited knowledge and inconsistent data on the effectiveness of telemedicine for various pediatric urologic conditions. Our aim was to evaluate the efficacy of pediatric urological care provided via video visits (VVs) at a large tertiary care children's hospital.

MATERIAL AND METHODS

We performed a prospective assessment of pediatric urology patients younger than 21 years who had a VV between 5/18/2022 and 5/17/2023. New patients with a testicular diagnosis were not eligible for VVs. After entering the diagnosis and submitting billing using a modifier for telemedicine, clinicians were mandated to select whether the VV allowed for: complete case management (CCM), suboptimal case management (SCM), or incomplete case management (ICM) requiring an in-person visit. Case management categorizations were analyzed according to patient pathology, visit type (i.e., new or established), and patient-centered variables including age, sex, race, insurance type, need for an interpreter, and distress score [a proxy for socioeconomic status].

RESULTS

During the one-year period, there were 3267 telemedicine patients with a median age of 9 years (IQR 3-13) and 57.0% were male. Most VVs (89.3%) were established encounters. Almost 12% of telemedicine patients had external organ pathology (EOP, e.g., phimosis), 43.0% had internal organ pathology (IOP, e.g., hydronephrosis), and 45.1% had functional urological pathology (FUP, e.g., dysfunctional voiding). Clinicians deemed 96.9%, 2.7%, and 0.5% of VVs as having CCM, SCM or ICM, respectively. Telemedicine patients with IOP or FUP were more likely to have CCM, than those with EOP (98.5% and 97.8% vs 87.1%, p < 0.0001). On multivariable analysis, patient age, pathology, and visit type were predictive of VV efficacy.

DISCUSSION

Now that telemedicine use has slowed, it is necessary to evaluate and establish its optimal role in pediatric urology. Factors associated with VV efficacy included older patient age, internal organ or functional urological pathology, and established encounters. The long-term success of telemedicine requires suitable patient selection.

CONCLUSIONS

Telemedicine is quite effective for the management of a wide variety of pediatric urology patients. Continued evaluation of telemedicine, including multi-institutional investigation and corroboration, is necessary for the development of evidence-based best practice guidelines regarding appropriate, safe, and effective integration of telemedicine that drives pediatric urological care forward to meet the demands of the future.

The importance of animal specificity in animal experimentation, part II: Physiological challenges and opportunities in relation to pediatric urology

When performing animal experimentation in Pediatric Urology studies, it is important to be aware of physiological differences between species and to understand when relevant disease models are available. Diseased animal models may be more relevant in many cases, rather than performing studies in healthy and normally developed animals. For example, they may be more appropriate for the study of congenital malformations, to investigate the secondary effects of prenatal urinary obstruction, to study the effect of prenatal exposure to endogenous or exogenous factors which may lead to disease, or in testing bioengineered structures. In this short educational article, we aim to describe some disease models that have been used to simulate human pathologies and how, if properly designed, these studies can lead to important new knowledge for human translation. In addition, we also highlight the importance of formulating a research question(s) before deciding on the animal experimental model and species to choose.

The importance of animal specificity in animal experimentation, part I: Anatomy in relation to pediatric urology

Why and when is animal experimentation relevant? The answer to this question depends on the research question. In this short educational article we aim to raise awareness of the importance of formulating a very specific research question before choosing an animal species. An awareness of anatomical and physiological differences vis-a-vis similarities between species, will increase the potential for obtaining data that is relevant for translation to human conditions.

Urology Mythbusters: Does prevalence of vesicoureteral reflux in children vary by race?

In this edition of Mythbusters, we examine the premise that prevalence of vesicoureteral reflux (VUR) in children varies by race. Specifically, we consider whether there is evidence supporting the contention that VUR is more common in White children and less common in Black children. Statements regarding the lower prevalence of VUR in Black children are ubiquitous in both research papers and reviews. Many of the references cited in support of these statements do not actually support the existence of racial variation in VUR, due to uncontrolled single-arm study designs, highly selected samples at risk for bias, or simply not addressing VUR prevalence at all. There is a small group of studies which directly compared VUR prevalence among children undergoing cystography, and these studies have found VUR to be less common among Black children compared to White children. However, the results of such papers can only be considered in the context of a system in which systemic bias and racism may impact access and care delivery in profound ways. Given that race is a social construct that bears little relationship to shared genetic ancestry or underlying biological characteristics, these findings must be approached with extreme caution. The goals of pediatric urological care should be to confer equitable care to all young children regardless of race.

Elevating pediatric urology care: The crucial role of nursing research in quality improvement

This educational article highlights the critical role of pediatric urology nursing research in improving the care of children with urological conditions. It discusses the multifaceted nature of pediatric urology nursing, addresses challenges such as limited nurse scientists and resource constraints, and highlights the need to overcome barriers to increase research involvement. The authors emphasize the importance of prioritizing research areas, the promotion of collaboration, and the provision of adequate funding and academic time for pediatric nurses to contribute to evidence-based practice, to improve patient outcomes. Furthermore, it highlights the importance of research in advancing nursing practice, shaping protocols, and advocating for the rights and needs of children with urological conditions and their families.

Artificial Intelligence in Pediatric Urology

Application of artificial intelligence (AI) is one of the hottest topics in medicine. Unlike traditional methods that rely heavily on statistical assumptions, machine learning algorithms can identify highly complex patterns from data, allowing robust predictions. There is an abundance of evidence of exponentially increasing pediatric urologic publications using AI methodology in recent years. While these studies show great promise for better understanding of disease and patient care, we should be realistic about the challenges arising from the nature of pediatric urologic conditions and practice, in order to continue to produce high-impact research.

Association between lower limb spasticity and cryptorchidism in males with cerebral palsy

AIM

To explore the association between presence and severity of lower limb spasticity (LLS) and risk of orchidopexy for cryptorchidism among people with cerebral palsy (CP) and to further define the cremasteric muscle spasticity theory.

METHOD

We queried the Pediatric Health Information System database for male patients with CP, stratified patients into those with/without LLS, and compared groups for orchidopexy occurrence. Comparative statistics were performed using χ2 and Mann-Whitney U tests for categorical and continuous variables respectively. The association between orchidopexy and spasticity type was investigated using logistic regression.

RESULTS

In total, 44 561 males with CP were identified. Of these, 1.6% underwent orchidopexy (median age: 7 years 8 months [interquartile range: 4 years 6 months-11 years 4 months]). LLS presence was significantly associated with higher orchidopexy rate compared to spasticity absence (odds ratio [OR] = 1.33 [1.10-1.59], p = 0.003). Among 7134 patients with LLS, intervention was significantly associated with higher orchidopexy rate (injection procedures: OR = 2.47 [2.27-6.39], p = 0.034; surgical procedure: OR = 2.60 [1.22-6.76], p = 0.026). LLS groin proximity was significantly associated with higher orchidopexy rate (OR = 2.52 [1.42-4.96], p = 0.003).

INTERPRETATION

A strong association exists between LLS presence and severity and orchidopexy risk among people with CP. These findings support a cremasteric spasticity hypothesis as an important factor of cryptorchidism in CP. Providers should continue to examine for cryptorchidism in males with CP as they age.

WHAT THIS PAPER ADDS

Lower limb spasticity (LLS) is associated with higher orchidopexy rate in cerebral palsy. Orchidopexy rate was higher in more severe LLS. Orchidopexy rate was higher in more proximal LLS.

Accuracy of telemedicine for diagnosis and pre-operative assessment of pediatric penile conditions

INTRODUCTION

Patients with penile conditions comprise a significant proportion of any pediatric urology practice, and physical examination is the mainstay of diagnosis for such conditions. While the rapid adoption of telemedicine (TM) facilitated access to pediatric urology care during the pandemic, the accuracy of TM-based diagnosis for pediatric penile anatomy and pathology has not been studied. Our aim was to characterize the diagnostic accuracy of TM-based evaluation of pediatric penile conditions by comparing diagnosis during the initial virtual visit (VV) with a subsequent in-person visit (IPV). We also sought to assess the agreement between scheduled and actual surgical procedure performed.

METHODS

A single-institution prospective database of male patients less than 21 years of age who presented for evaluation of penile conditions between August 2020 and December 2021 was analyzed. Patients were included if they had an IPV with the same pediatric urologist within 12 months of the initial VV. Diagnostic concordance was based on a surgeon-reported survey of specific penile diagnoses, completed at both initial VV and follow-up IPV. Surgical concordance was assessed based on the proposed versus billed CPT code(s).

RESULTS

Median age among 158 patients was 10.6 months. The most frequent VV diagnoses were penile adhesions (n = 37), phimosis (n = 26), "other" (n = 24), post-circumcision redundancy (n = 18), and buried penis (n = 14). Initial VV and subsequent IPV diagnoses were concordant in 40.5% (64/158); 40/158 (25%) had partial concordance (at least one diagnosis matched). There was no difference in age, race, ethnicity, median time between visits, or device type between patients with concordant vs. discordant diagnoses. Of 102 patients who underwent surgery, 44 had VV only while 58 had IPV prior to surgery. Concordance of scheduled versus actual penile surgery was 90.9% in those patients who only had a VV prior to surgery. Overall, surgery concordance was lower among those with hypospadias repairs vs. non-hypospadias surgery (79.4% vs. 92.6%, p = 0.05).

CONCLUSION

Among pediatric patients being evaluated by TM for penile conditions, there was poor agreement between VV-based and IPV-based diagnoses. However, besides hypospadias repairs, agreement between planned and actual surgical procedures performed was high, suggesting that TM-based assessment is generally adequate for surgical planning in this population. These findings leave open the possibility that, among patients not scheduled for surgery or IPV, certain conditions might be misdiagnosed or missed entirely.

Characterizing digital access in pediatric urology

BACKGROUND

Virtual medicine has the potential to improve access for underserved populations by facilitating timely remote evaluation. However, challenges in the real-world implementation of this technology may paradoxically exacerbate health disparities. We sought to characterize families' digital access and how social determinants of health may impact virtual medicine access within pediatric urology. We hypothesized that disadvantaged socioeconomic status would be a barrier to virtual medicine access.

STUDY DESIGN

A digital access screening tool was prospectively developed and launched in July 2021. Schedulers are prompted to complete this optional screening questionnaire at the time of patient intake, for video or in-person encounters. The parent is screened for access to a device and reliable internet or cellular data that could be used to participate in a video visit. These represented the primary study outcomes. A modality preference for an in-person visit, video visit, or no preference was also recorded. Patient demographics were retrospectively evaluated, and socioeconomic status was estimated using the Distressed Communities Index generated for each patient's zip code. For each zip code, the Distressed Communities Index produces a normalized, comparative distress score ranging from 0 ("prosperous") to 100 ("distressed").

RESULTS

3885 patients were included, with median age of 5 years (IQR 1-11). Almost 74% were male, 71.3% were White, 20.9% had public insurance, and 2.9% required an interpreter. The median distress score was 14.2 (IQR 7.2-27.5). Screening revealed that 136 families (3.5%) lacked digital access. On multivariable logistic regression analysis, insurance type (p = 0.0020) and distress score (p = 0.0125) were significant predictors of digital access (Summary Table). Those patients who lacked access to a device (p < 0.0001) or reliable internet/cellular data (p < 0.0001) were more likely to prefer an in-person visit.

DISCUSSION

Family screening revealed that there is a small but significant proportion of families who lack digital access, and this cohort disproportionately represents underserved communities with higher distress scores, likely reflecting lower socioeconomic status. Those families without digital access were more likely to prefer an in-person visit. Improved identification of these socially complex "at-risk" patients can assist in the development of more inclusive health care strategies.

CONCLUSIONS

Despite the chance for virtual medicine to expand access for underserved populations, lack of digital tools may hinder its potential impact on health disparities in pediatric urology. Ongoing digital access screening and further studies are needed to design interventions tailored to the specific needs of our patients, allowing for more equitable pediatric urological care.

Vesicoureteral Reflux: Current Care Trends and Future Possibilities

Although investigations over the past 2 decades have improved our understanding of the natural history of vesicoureteral reflux (VUR) and helped identify those at higher risk of both VUR itself as well as its potential severe sequelae, debate exists regarding key aspects of care, including when to perform diagnostic imaging and which patients benefit from continuous antibiotic prophylaxis. Artificial intelligence and machine learning have the potential to distill large volumes of granular data into practical tools that clinicians can use to guide diagnosis and management decisions. Surgical treatment, when indicated, remains highly effective and is associated with low morbidity.

Is cerebral palsy associated with successful ureteral access during the initial attempt at ureteroscopy for urolithiasis in children and young adults?

BACKGROUND

Ureteroscopy is a common treatment for urolithiasis, but initial ureteral access is not always possible, particularly in pediatrics. Clinical experience suggests that neuromuscular conditions such as cerebral palsy (CP) may facilitate access, thus avoiding the need for pre-stenting and staged procedures.

OBJECTIVE

We sought to determine if probability of successful ureteral access (SUA) during initial attempted ureteroscopy (IAU) is higher in pediatric patients with CP vs. without CP.

STUDY DESIGN

We reviewed IAU cases for urolithiasis (2010-2021) at our center. Patients with pre-stenting, prior ureteroscopy, or urologic surgical history were excluded. CP was defined using ICD-10 codes. SUA was defined as scope access to urinary tract level sufficient to reach stone. Association of CP and other factors with SUA were evaluated.

RESULTS

230 patients (45.7% male, median age: 16 years [IQR: 12-18 y], 8.7% had CP) underwent IAU, with SUA in 183 (79.6%). SUA occurred in 90.0% of patients with CP vs. 78.6% of those without CP (p = 0.38). SUA was 81.7% in patients >12 years (vs. 73.8% in those <12), and the highest SUA was in those >12 years with CP (93.3%), but these differences were not statistically significant. Renal stone location was significantly associated with lower SUA (p = 0.007). Among patients with renal stone only, SUA in those with CP was 85.7% vs. 68.9% in those without CP (p = 0.33). SUA did not differ significantly by gender or BMI.

CONCLUSIONS

CP may facilitate ureteral access during IAU in pediatric patients, but we were unable to show a statistically significant difference. Further study of larger cohorts may demonstrate whether CP or other patient factors are associated with successful initial access. Improved understanding of such factors would help preoperative counseling and surgical planning for children with urolithiasis.

OXGR1 is a candidate disease gene for human calcium oxalate nephrolithiasis

PURPOSE

Nephrolithiasis (NL) affects 1 in 11 individuals worldwide, leading to significant patient morbidity. NL is associated with nephrocalcinosis (NC), a risk factor for chronic kidney disease. Causative genetic variants are detected in 11% to 28% of NL and/or NC, suggesting that additional NL/NC-associated genetic loci await discovery. Therefore, we employed genomic approaches to discover novel genetic forms of NL/NC.

METHODS

Exome sequencing and directed sequencing of the OXGR1 locus were performed in a worldwide NL/NC cohort. Putatively deleterious, rare OXGR1 variants were functionally characterized.

RESULTS

Exome sequencing revealed a heterozygous OXGR1 missense variant (c.371T>G, p.L124R) cosegregating with calcium oxalate NL and/or NC disease in an autosomal dominant inheritance pattern within a multigenerational family with 5 affected individuals. OXGR1 encodes 2-oxoglutarate (α-ketoglutarate [AKG]) receptor 1 in the distal nephron. In response to its ligand AKG, OXGR1 stimulates the chloride-bicarbonate exchanger, pendrin, which also regulates transepithelial calcium transport in cortical connecting tubules. Strong amino acid conservation in orthologs and paralogs, severe in silico prediction scores, and extreme rarity in exome population databases suggested that the variant was deleterious. Interrogation of the OXGR1 locus in 1107 additional NL/NC families identified 5 additional deleterious dominant variants in 5 families with calcium oxalate NL/NC. Rare, potentially deleterious OXGR1 variants were enriched in patients with NL/NC compared with Exome Aggregation Consortium controls (χ2 = 7.117, P = .0076). Wild-type OXGR1-expressing Xenopus oocytes exhibited AKG-responsive Ca2+ uptake. Of 5 NL/NC-associated missense variants, 5 revealed impaired AKG-dependent Ca2+ uptake, demonstrating loss of function.

CONCLUSION

Rare, dominant loss-of-function OXGR1 variants are associated with recurrent calcium oxalate NL/NC disease.

False-positive urine pregnancy screening tests are uncommon in the hospital setting among patients with bowel-containing urinary tract reconstruction

PURPOSE

False-positive urine pregnancy screening tests (UPST) have been reported among patients with bowel-containing urinary reconstruction (BCUR). However, the true frequency of such inaccurate results, which have been attributed to urinary mucous or other proteins interfering with or mimicking the binding of beta-HCG in the assay, is unknown in this population. We sought to determine the incidence of false-positive pregnancy screening tests among this patient population at our institution.

MATERIALS AND METHODS

Using existing databases of patients with spina bifida, bladder exstrophy, and genitourinary rhabdomyosarcoma, we identified female patients with BCUR who had UPST over a 10-year period as screening prior to procedures or imaging. Patient and test result information was recorded.

RESULTS

A total of 120 patients with a history of BCUR were identified: 33 with spina bifida, 73 within the exstrophy-epispadias complex (EEC), and 14 with genitourinary rhabdomyosarcoma. Of this group, 46 patients (38%) had at least one UPST during the study period; 15 had 1 UPST, 6 had 2 UPSTs, 4 had 3 UPSTs, and 21 had greater than 3 UPSTs, for a total of 244 UPST in this cohort. UPSTs used at our institution included Sure-Vue brand and Alere brand (HCG sensitivity 20 mIU/ml). Types of BCUR included ileal enterocystoplasty in 25 patients, colon enterocystoplasty in 6, stomach enterocystoplasty in 5, composite enterocystoplasty in 7, and continent catheterizable channel alone (e.g. Yang-Monti, appendicovesicostomy) in 3 patients. Of the 244 UPSTs in patients with BCUR, zero (0%) were positive.

CONCLUSIONS

Despite reports in the literature that false-positive UPST are common among patients with bowel-containing urinary diversions, we found no positive UPST among patients with BCUR in the healthcare setting. False-positive UPST in the home setting may be due to variability in sensitivity thresholds, binding agents, technical errors in test technique, kit quality control, or other factors.

The orchestration of gene expression and the editing role of microRNA

In this short educational communication the ESPU Research Committee presents the role of non-coding RNA and how these can affect gene expression. In particular we discuss the role of microRNA on post transcriptional changes and how these may cause pathological conditions within Pediatric Urology and how microRNA could be useful in future clinical practice.

Is parenteral antibiotic prophylaxis associated with fewer infectious complications in stented, distal hypospadias repair?

INTRODUCTION

Judicious use of antibiotics for surgical prophylaxis is important for reducing antimicrobial resistance while preventing infectious surgical complications. In the setting of pediatric distal hypospadias repairs, it is unclear if antibiotic surgical prophylaxis is beneficial.

OBJECTIVE

The purpose of this study was to compare rates of infectious complications in pediatric subjects undergoing distal hypospadias repair who received any peri-operative antibiotics to those who did not.

STUDY DESIGN

This was a review of a retrospective cohort from a database of individuals undergoing hypospadias repairs evaluating whether they received peri-operative or post-operative antibiotic prophylaxis and determining the rate of infectious complications in those who did compared to those who did not receive antibiotic prophylaxis. Infectious complications were defined as surgical site infection (SSI) or urinary tract infection (UTI).

RESULTS

There was no significant difference in infectious complication rates between individuals who received peri-operative parenteral antibiotic prophylaxis and those who did not. All subjects with infectious complications received post-operative oral antibiotic prophylaxis. There was one instance of C. difficile infection in a subject who received peri-operative parenteral antibiotics.

DISCUSSION

Reducing antibiotic utilization without increasing infectious surgical complications is important in safely reducing antimicrobial resistance. In this study of pediatric distal hypospadias repair, peri-operative antibiotics did not demonstrate a clear benefit and post-operative oral antibiotics demonstrated no benefit in preventing infectious complications. Other studies evaluating peri- and post-operative antibiotics for pediatric hypospadias repair have also failed to demonstrate a benefit for antibiotics in preventing infections. Practitioners should reconsider the use of antibiotics in this setting.

CONCLUSION

Routine antibiotic prophylaxis does not appear beneficial for preventing infectious complications following uncomplicated, stented pediatric distal hypospadias repairs.

Hybrid Clinics: A New Model for Ambulatory Care to Reduce Infection Risk

Objectives: To assess the viability of a hybrid clinic model combining in-person examination with video-based consultation to minimize viral transmission risk. Methods: Data were collected prospectively in a pediatric urology clinic for in-person visits from January to April 2018 ("classic") and hybrid visits from October to December 2020 of the COVID-19 pandemic ("hybrid"). Variables included provider, diagnosis, patient type, time of day, prior surgery, postoperative status, and decision-making for surgery. The primary outcome was "room time" or time in-person. The secondary outcome was "total time" or visit duration. Proportion of visits involving close contact (room time ≥15 min) was assessed. Univariate analyses were performed using the Wilcoxon rank-sum test and Fisher's exact test. Mixed models were fitted for visit approach and other covariates as fixed effects and provider as random effect. Results: Data were collected for 346 visits (256 classic, 90 hybrid). Hybrid visits were associated with less room time (median 3 min vs. 10 min, p < 0.001) but greater total time (median 13.5 min vs. 10 min, p = 0.001) as compared with classic visits. On multivariate analysis, hybrid visits were associated with 3 min less room time (95% confidence intervals [CIs]: -5.3 to -1.7, p < 0.001) but 3.8 min more total time (95% CI: 1.5-6.1, p = 0.001). Close contact occurred in 6.7% of hybrid visits, as compared with 34.8% of classic visits (p < 0.001). Conclusions: Hybrid clinic visits reduce room time as compared with classic visits. This approach overcomes the examination limitations of telemedicine while minimizing viral transmission, and represents a viable model for ambulatory care whenever close contact carries infection risk.

Normative values for ureteral diameter in children

BACKGROUND

Assessment of the ureter is a fundamental part of the radiologic evaluation of the urinary tract. Abnormal ureteral dilation warrants further investigation to assess the etiology, which includes obstruction and/or reflux. Despite this fundamental need, there are no established normative values in children based on imaging.

OBJECTIVE

To provide normative values for ureteral diameter in pediatric patients with age-related ranges.

MATERIALS AND METHODS

We retrospectively reviewed all magnetic resonance (MR) urography studies and chose only normal ureters for assessment. The images were analyzed on commercially available software to assess maximum internal diameter. Manual measurements were done in cases where the images were below the resolution for automated assessment. Maximum intraluminal ureteral diameters were measured in upper, mid and lower thirds and the average of the three maximum ureteral diameters was used to obtain the average widest internal ureteral diameter. Multivariable linear regression was performed to test the association between the calculated diameter and gender. Differences in sizes between the left and right ureter were assessed using paired Wilcoxon signed rank test.

RESULTS

One hundred twenty-one MR urography studies were selected, which included 160 ureter units. The diameter increases progressively with age, ranging from 3.2 mm during infancy to 5.0 mm in patients older than 16 years of age. After 9 years of age, the average widest internal ureteral diameter is slightly larger in males compared to females (odds ratio [OR]=1.91, 95% confidence interval [CI] [1.63, 2.25], P<0.0001). The right ureter was slightly larger than the left (3.9 mm vs. 3.7 mm, P=0.004) among 39 patients in whom both right and left ureter units were included. The average mid ureteral diameter is widest, followed by the distal third then proximal third.

CONCLUSION

We present the normative values for the average widest internal ureteral diameter based on laterality and different segments. In the pediatric population, 3.8 mm should be considered the average widest internal ureteral diameter.

Measurement and initial characterization of leukocyte telomere length in 474,074 participants in UK Biobank

Leukocyte telomere length (LTL) is a proposed marker of biological age. Here we report the measurement and initial characterization of LTL in 474,074 participants in UK Biobank. We confirm that older age and male sex associate with shorter LTL, with women on average ~7 years younger in 'biological age' than men. Compared to white Europeans, LTL is markedly longer in African and Chinese ancestries. Older paternal age at birth is associated with longer individual LTL. Higher white cell count is associated with shorter LTL, but proportions of white cell subtypes show weaker associations. Age, ethnicity, sex and white cell count explain ~5.5% of LTL variance. Using paired samples from 1,351 participants taken ~5 years apart, we estimate the within-individual variability in LTL and provide a correction factor for this. This resource provides opportunities to investigate determinants and biomedical consequences of variation in LTL.

Changes in Clinical Presentation and Renal Outcomes among Children with Febrile Urinary Tract Infection: 2005 vs 2015

PURPOSE

Recent studies have demonstrated trends of decreasing voiding cystourethrogram utilization rates and delayed vesicoureteral reflux diagnosis in some children. It is possible that such delays could lead to more children sustaining repeated episodes of febrile urinary tract infection, and potential kidney injury, prior to diagnosis and treatment.

MATERIALS AND METHODS

Using single institutional, cross-sectional cohorts of patients in 2 time periods (2005 and 2015), we compared clinical presentation and renal outcomes among patients 13 years and younger with history of febrile urinary tract infection presenting for initial voiding cystourethrogram. Outcomes included 1) recurrent urinary tract infection, 2) presence of vesicoureteral reflux, 3) grade of vesicoureteral reflux, and 4) renal scarring. Associations between year of presentation and outcomes of recurrent urinary tract infection and vesicoureteral reflux diagnosis were evaluated using multivariable logistic regression models. For the outcome of renal scarring, a logistic regression model was fitted for propensity score matched cohorts.

RESULTS

Compared to children presenting in 2005, those in 2015 had 3 times the odds of recurrent urinary tract infection (OR 3.01, 95% CI 2.18-4.16, p <0.0001). Time period was not associated with the odds of vesicoureteral reflux (OR 0.98, 95% CI 0.77-1.23, p=0.85). Those in 2015 were more likely to present with vesicoureteral reflux grade >3 (OR 2.22, 95% CI 1.13-4.34, p=0.02) but not vesicoureteral reflux grade >2 (OR 1.11, 95% CI 0.74-1.67, p=0.60). Renal scarring was more common among children presenting in 2015 (OR 2.9, 95% CI 1.03-8.20, p=0.04).

CONCLUSIONS

Compared to 2005, children presenting in 2015 for post-urinary tract infection voiding cystourethrogram have increased likelihood of recurrent urinary tract infection and renal scarring, despite similar likelihood of vesicoureteral reflux diagnosis.

Flat Panel Detector c-Arms Are Associated with Dramatically Reduced Radiation Exposure During Ureteroscopy and Produce Superior Images

Background: We wished to determine whether newly available flat panel detector (FPD) c-arms were (1) associated with lower radiation dose during ureteroscopy (URS) than conventional image intensifier (CII) c-arms and (2) to compare fluoroscopic image quality between the units. Materials and Methods: We retrospectively reviewed 44 consecutive patients undergoing URS at a pediatric hospital, with c-arms assigned by availability in the operating room. We performed dosimetry experiments using the same c-arms on standard phantoms. Results: Patient and case characteristics did not differ significantly between the two groups of patients. The median dose in the FPD group was less than a quarter of the dose in the CII group, 0.48 [0.42, 0.97] mGy vs 2.2 [1.1, 3.8] mGy, p < 0.0001. The FPD dose remained at less than one-third of the CII dose accounting for any difference in fluoroscopy time, and remained significant in a multivariate model including fluoroscopy time and patient weight (β = 2.4, p = 0.007). Phantom studies showed higher image quality for FPDs at all simulated patient sizes, even at lower radiation doses. Conclusions: This is the first report comparing radiation dose from c-arms of image intensifiers and FPDs in adults or children. Use of an FPD during URS was associated with a substantially decreased absorbed dose for patients while simultaneously improving image quality.

Contemporary Management of Urinary Tract Infection in Children

Urinary tract infection (UTI) is common in children, and girls are at a significantly higher risk, as compared to boys, except in early infancy. Most cases are caused by Escherichia coli Collection of an uncontaminated urine specimen is essential for accurate diagnosis. Oral antibiotic therapy for 7 to 10 days is adequate for uncomplicated cases that respond well to the treatment. A renal ultrasound examination is advised in all young children with first febrile UTI and in older children with recurrent UTI. Most children with first febrile UTI do not need a voiding cystourethrogram; it may be considered after the first UTI in children with abnormal renal and bladder ultrasound examination or a UTI caused by atypical pathogen, complex clinical course, or known renal scarring. Long-term antibiotic prophylaxis is used selectively in high-risk patients. Few patients diagnosed with vesicoureteral reflux after a UTI need surgical correction. The most consequential long-term complication of acute pyelonephritis is renal scarring, which may increase the risk of hypertension or chronic kidney disease later in life. Treatment of acute pyelonephritis with an appropriate antibiotic within 48 hours of fever onset and prevention of recurrent UTI lowers the risk of renal scarring. Pathogens causing UTI are increasingly becoming resistant to commonly used antibiotics, and their indiscriminate use in doubtful cases of UTI must be discouraged.

Adjuvant pharmacological and surgical therapy for testicular torsion: Current state of the art

INTRODUCTION

Although the consequences of testicular torsion (TT) have been recognized for centuries, little progress has been made to improve outcomes beyond those seen with timely scrotal exploration. Even with testicular salvage, ischemia/reperfusion injury cause significant atrophy and functional impairment. Recent efforts have sought to identify adjuvant pharmacological or surgical interventions that may attenuate these consequences. In this review, we assess the evidence supporting clinical use of these nascent interventions.

METHODS

We conducted a review of the literature published from 2000 to 2020, using the search terms "torsion", "testicular", "reperfusion", "ischemia", and "injury". Clinical and laboratory research focused on adjuvant pharmacological and surgical techniques mitigating torsion-associated injury in animal models and humans were identified. We recorded intervention timing/dose/route, and outcome timing/category through biomarkers of reperfusion injury, histology, and hormonal/reproductive function.

RESULTS

Fifty-four FDA-approved agents, plus 52 herbal/investigational drugs, were reported in animal TT models. In every study, the investigated agents showed beneficial effects on measured endpoints compared to controls. Despite these universally promising animal findings, no pharmacological trials in humans were reported. Surgical techniques studied in animal models included decompression (tunica albuginea incision, TAI), "ischemic conditioning", and hypothermia. Only three human studies on surgical adjuvant maneuvers have been reported, all involving TAI; these showed potential benefit, but the level of evidence is low.

CONCLUSION

There is preliminary evidence that adjuvant treatments may mitigate the effects of ischemia/reperfusion injury. However, the pool of investigated pharmacological agents is wide, yet remarkably shallow; most compounds have been reported in a single animal study. To advance this field, a mechanism-based approach should be used to select promising agents that can be tested systematically. This will determine treatment parameters that maximize safety, efficacy, and tolerability. Only then is it possible to move toward human trials. Adjuvant surgical methods such as TAI show promise in humans but require more robust clinical evaluation.

Timing and outcomes of testicular torsion during the COVID-19 crisis

BACKGROUND

During the COVID-19 crisis, there has been widespread reporting that non-COVID-19-related medical care has been delayed, even for emergent conditions. Testicular torsion is an emergent condition with higher risk of testicular loss with longer ischemic times. We sought to investigate whether patients with testicular torsion had longer time from symptom onset to initial presentation, longer total ischemic time, and higher rate of orchiectomy during the pandemic.

MATERIALS AND METHODS

Using billing data, we identified all patients age >1yo seen in our hospital from 1/1/2018 through 5/31/2020 who underwent emergent scrotal exploration for confirmed testicular torsion, comparing the COVID-19 crisis (3/1/2020-5/31/20) to the pre-COVID-19 period (1/1/2018-2/29/20). The primary outcome was time from symptom onset to initial presentation and secondary outcomes were ischemic time (time from symptom onset to entry of the OR) and orchiectomy rate. Parameters were compared with Mann-Whitney U and Fisher's exact tests; Poisson regression compared rates of torsion.

RESULTS

Of 94 total cases, 77 occurred during the pre-COVID-19 period and 17 during the COVID-19 crisis. Median time from symptom onset to initial presentation was not significantly different (2.4 h [IQR 1.1 h-38.9] during COVID-19 vs. 5.6 h [IQR 1.6-16.9] during pre-COVID-19 period, p = 0.476). Time to presentation was >12 h in 5/17 patients (29%) during COVID-19 and 24/77 patients (31%) during pre-COVID-19 period (p = 1.00). Median ischemic time during COVID-19 was 7.5 h (IQR 4.7 h-45.5 h) compared to 9.4 h (IQR 5.4 h-22.5 h) during pre-COVID-19 period (p = 0.694). Incidence of orchiectomy in our center was 29% (5/17) during COVID-19 and 17% (13/77) during pre-COVID-19 period (p = 0.397). About half of patients were seen initially at outside facilities prior to arrival (47% [8/17] during COVID-19 vs. 49% [38/77] during pre-COVID-19 period, p = 1.00). The number of torsion case presentations per week to our facility increased from 0.7 cases/week in the pre-COVID-19 period to 1.3 cases/week during COVID-19 (p = 0.015); when comparing only the March 1 to May 31 calendar period, there were 0.6 cases/week during the pre-COVID-19 period and 1.3 cases/week during COVID-19 (p = 0.021).

CONCLUSION

Time to presentation, ischemic times, and orchiectomy rates for testicular torsion at our center were not significantly different during the COVID-19 period compared to the preceding 2 year period. The number of torsion case per week presenting to our facility increased significantly.

Pattern recognition algorithm to identify detrusor overactivity on urodynamics

AIMS

Detrusor overactivity (DO) of the bladder is a finding on urodynamic studies (UDS) that often correlates with lower urinary tract symptoms and drives management. However, UDS interpretation remains nonstandardized. We sought to develop a mathematical model to reliably identify DO in UDS.

METHODS

We utilized UDS archive files for studies performed at our institution between 2013 and 2019. Raw tracings of vesical pressure, abdominal pressure, detrusor pressure, infused volume, and all annotations during UDS were obtained. Patients less than 1 year old, studies with calibration issues, or those with significant artifacts were excluded. In the training set, five representative DO patterns were identified. Candidate Pdet signal segments were matched to representative DO patterns. Manifold learning and dynamic time warping algorithms were used. Five-fold cross validation (CV) was used to evaluate the performance.

RESULTS

A total of 799 UDS studies were included. The median age was 9 years (range, 1-33). There were 1,742 DO events that did not overlap with annotated artifacts (cough, cry, valsalva, movements). The AUC of the training sets from the five-fold CV was 0.84 ± 0.01. The five-fold CV leads to an overall accuracy 81.35%, and sensitivity and specificity of detecting DO events are 76.92% and 81.41%, respectively, in the testing set.

CONCLUSIONS

Our predictive model using machine learning algorithms provides promising performance to facilitate automated identification of DO in UDS. This would allow for standardization and potentially more reliable UDS interpretation. Signal processing and machine learning interpretation of the other components of UDS are forthcoming.

Children's experience with daytime and nighttime urinary incontinence - A qualitative exploration

BACKGROUND

Much of our knowledge about the impact of urinary incontinence (UI) on children is derived from surveys. While these studies provide an overview of the UI experience, personal interviews may offer additional nuances and a more detailed perspective of what the experience of UI is for children. Objective To conduct interviews and use qualitative analysis to explore the experiences of children with UI, with a particular focus on (1) the impact of UI on participants' lives, (2) which coping strategies children with UI use, and (3) the emotional effects of UI.

STUDY DESIGN

Semi-structured interviews of children with non-neurogenic and non-anatomic UI recruited from a pediatric urology clinic were audio recorded and verbatim transcribed. Eligibility included: age 8-17 years, history of UI, English fluency, and being able to participate in a 30 min interview. Conventional content analysis was performed to identify themes directly from the transcripts. Coders independently and iteratively coded transcripts (intercoder reliability >0.85) until inductive thematic saturation was achieved.

RESULTS

There were substantial practical and emotional impacts on the 30 (14 males, 16 females) children (median age 11.5 years) with UI. Participants relayed significant interference with social activities like sports and sleepovers, which often lead to avoidant behavior of these activities. By contrast, most stated that UI did not impair school performance. The most strongly and consistently expressed emotions were embarrassment and anxiety. Nevertheless, children described a wide variety of adaptations, including behavioral and cognitive, to manage their incontinence and its effects on their lives (Summary Table).

DISCUSSION

This is the first qualitative study that describes the experiences and perspectives of children with UI. Surveys of this population suggest a lower health-related quality of life, particularly in emotional well-being, self-esteem and relationships. This work augments this body of literature and shows how UI interferes with their daily life and is a major source of embarrassment and anxiety. Despite this, children with UI display strong resilience and adapt to their condition. The study was limited in that the sample was biased to those presenting to a urology clinic and was not designed to compare differences in UI experience between ages, genders, or treatment types.

CONCLUSION

This study, the first qualitative exploration of the emotional responses and coping behaviors of children with UI, shows significant social impact and negative emotional responses but marked resiliency. These findings should be considered when developing a comprehensive treatment strategy for children with UI.

Urology Mythbusters: are topical corticosteroids effective for treating postcircumcision penile adhesions?

In this edition of Mythbusters, we evaluate the common claim that topical corticosteroids (TCS) can be used for treatment of postcircumcision penile adhesions (PCPA). Although many textbooks and websites of respected pediatric institutions include topical steroids as one of the options for treatment of PCPA, the scientific basis of this claim is unclear and none of the references we found cited any specific sources. In review of the literature, we could find no peer-reviewed studies that support (or even assess) the utility of TCS for PCPA. It appears that the claims regarding TCS may be extrapolations from the demonstrated effectiveness of TCS for phimosis and related problems, although these are different conditions with different etiologies. We conclude that there is no scientific evidence supporting the use of TCS for PCPA. The verdict for this urolegend: 'Debunked.'

Interobserver Reliability of the Antenatal Consensus Classification System for Urinary Tract Dilatation

OBJECTIVES

The consensus classification system for urinary tract dilatation (UTD) was designed to be more objective and reproducible than previously used systems. We sought to evaluate interobserver reliability of UTD components and overall scores in a prenatal population undergoing third-trimester ultrasound examinations.

METHODS

We retrospectively identified patients who underwent antenatal ultrasound examinations for UTD between 28 and 40 weeks' gestation. All images from individual studies of 300 fetuses were reviewed independently by 5 experienced sonologists (1 maternal-fetal medicine specialist and 4 radiologists). Urinary tract dilatation scores (normal, A1, or A2/3) and Society for Fetal Urology (SFU) scores were assigned. Interobserver agreement between raters was evaluated with the Fleiss κ statistic.

RESULTS

Overall interobserver agreement for the antenatal UTD risk score showed substantial agreement among all 5 readers (κ = 0.657 [95% confidence interval, 0.632, 0.683]; P < .001). All 5 readers applied the same UTD risk score in 53.7% of cases. Some variability in the antenatal UTD score and individual elements was observed. At least 2 UTD risk scores were assigned to a specific individual patient in 46.3% of cases (139 of 300), and all 3 UTD risk scores were assigned to a specific individual patient in 1.7% of cases (5 of 300). In 18.0% of cases (54 of 300), at least 2 readers assigned a UTD score different from that assigned by the other readers. Agreement was lowest for parenchymal appearance (κ = 0.225). Agreement for the SFU system was fair (κ = 0.368; P < .001).

CONCLUSIONS

Interobserver agreement for the antenatal UTD grading system was substantial. Compared to the SFU system, the antenatal UTD system showed better agreement among readers.

Accuracy of Ultrasound in Identifying Renal Scarring as Compared to DMSA Scan

OBJECTIVE

To assess the accuracy of renal ultrasound (RUS) in detecting renal scarring (RS).

METHODS

All initial DMSA scans performed from 2006 to 2009 for history of urinary tract infection (UTI) or vesicoureteral reflux (VUR) in patients under 14 years old were identified, and clinical history obtained via chart review. Patients who had RUS within 4 months of DMSA scan and no documented UTI during that interval were included. Decreased uptake of tracer associated with loss of contours or cortical thinning defined a positive DMSA study. Increased echogenicity/dysplasia, cortical thinning, atrophic kidney and/or abnormal corticomedullary differentiation defined a positive RUS. The sensitivity and specificity of RUS in identifying RS were calculated using DMSA scan as the gold standard.

RESULTS

A total of 144 patients had initial DMSA scans performed for UTI or VUR, with a RUS within 4 months, and no UTI between the 2 studies. Ninety-five of 144 (66%) had RS on DMSA and 49/144 (34%) did not. Patients with or without RS on DMSA were not different in gender (P = .073), age (P = .432), insurance (P = 1.000) or VUR grade (P = .132). Only 39/144 (27.1%) patients had positive RUS. The sensitivity of RUS for RS was 35.8% and the specificity was 89.8%, leading to an accuracy of 54.2% (95%CI; 45.7-62.5%, P = .999).

CONCLUSION

RUS demonstrated poor sensitivity for RS visualized on DMSA scan. This suggests that RUS is a poor screening test for RS or indicators of future renal scar. A normal ultrasound does not rule out RS or risk of future renal scar. Specificity of RUS was excellent.

Urology mythbusters: do we need to surgically correct vesicoureteral reflux in older girls to prevent problems in future pregnancy? (revision 1)

In this edition of Mythbusters we critically examine the premise that, because women with history of vesicoureteric reflux (VUR) are at higher risk of urinary tract infection (UTI) and other morbidity during pregnancy, persistent VUR in older girls should be considered an indication for surgical correction. The literature is very limited in that there are essentially no methodologically robust comparisons of pregnancy outcomes among women whose childhood VUR was or was not surgically repaired. Most of the case series and cohorts find relatively high incidence of UTI and pyelonephritis among pregnant women with a history of VUR, but there is very little to suggest that persistent VUR is itself a risk factor for infection during pregnancy. Indeed, some studies suggest that UTI risk is actually higher among women who previously underwent anti-reflux surgery compared to those who did not, although these data are compromised by significant selection bias. In contrast, there is relatively strong evidence that maternal and fetal morbidity is higher when the mother is known to have renal scarring; such women probably merit close surveillance during pregnancy for infection, hypertension and pre-eclampsia, and other problems. Overall, current evidence is insufficient to support routine anti-reflux surgery in girls with the sole purpose of decreasing complications during future pregnancy, particularly for girls with lower-grades of VUR and no renal scarring. The verdict for this urolegend: it contains a a "teeny, tiny nugget of truth."

The association of postnatal urinary tract dilation risk score with clinical outcomes

BACKGROUND

There are limited data on the predictive value of the consensus urinary tract dilation (UTD) score with respect to subsequent clinical diagnoses. We sought to define the relationship between postnatal UTD risk score and clinical outcomes during childhood.

METHODS

Complete ultrasound image sets from a random selection of infants aged 0-90 days undergoing initial ultrasound at a single institution for prenatal hydronephrosis between 2012 and 2014 were assigned a UTD score by 1 pediatric urologist and 1 pediatric radiologist. Urinary tract dilation risk score was analyzed for association with a composite outcome comprising urinary tract infection, vesicoureteral reflux (VUR), ureteropelvic junction obstruction, non-refluxing megaureter (NRM), ureterocele, bladder outlet obstruction (BOO), and chronic kidney disease. Surgical intervention and resolution of UTD were evaluated separately. Descriptive and survival analyses were performed.

RESULTS

Urinary tract dilation scores for 494 subjects were P0 in 23.5%, P1 in 26.5%, P2 in 23.5%, and P3 in 26.5%. Seventy-four percent were male. Median age at initial imaging was 28 days; median follow-up was 19.8 months. The composite outcome occurred in 138 of 494 patients (27.9%) and varied significantly (p < 0.001) by UTD score: 11.2% for P0, 10.7% for P1, 29.3% for P2, and 58.8% for P3. On survival analysis (Summary Figure), higher UTD grade was significantly associated with the composite outcome (hazard ratio for P3 vs. P0 was 7.4 [95% CI: 3.44-15.92, p < 0.001]). Urinary tract infection and VUR diagnosis varied by UTD score (p = 0.03 and p < 0.001, respectively). Ureteropelvic junction obstruction was diagnosed (based on MAG3 results) in 6.3% of patients, 84% of whom were P3. Non-refluxing megaureter was diagnosed in 7.7%. Ureterocele and BOO were uncommon (1.4%, and 0.6%, respectively). Surgical intervention was also associated with UTD risk, with 46% of P3 undergoing surgery vs. 1% of P0, 1% of P1, and 6% of P2 (p < 0.001). Resolution of UTD occurred in 41% (median 10.1 months) and varied significantly by UTD risk (p < 0.001).

DISCUSSION

Urinary tract dilation risk score is associated with clinical events, although ascertainment bias may influence some of the differences in outcomes, particularly for VUR, because VCUG utilization varied by the UTD group. The lack of any significant difference in outcomes between patients with UTD P0 versus P1 suggests that the P1 category could be eliminated as it does not meaningfully distinguish between outcome risk.

CONCLUSIONS

Higher UTD risk scores are strongly associated with genitourinary diagnoses during the first two years of life.

Urology Mythbusters: should hydronephrosis grade be used to decide which newborns should undergo voiding cystourethrogram?

In this episode of Mythbusters the premise that among infants with prenatally identified urinary tract dilation (UTD), voiding cystourethrogram (VCUG) should be performed in those with higher grade UTD but not in those with lower grade UTD is critically examined. It is concluded that severity of dilation is not strongly associated with risk of vesicoureteral reflux or other anomalies diagnosed by VCUG. Therefore, using hydronephrosis grade to decide which infants with UTD should undergo VCUG is not evidence based.

Patient- and Nurse-Controlled Analgesia: 22-Year Experience in a Pediatric Hospital

OBJECTIVES

Pediatric pain management has rapidly changed over the last 2 decades. In this study, we describe the changing practices and adverse events (AEs) related to patient-controlled analgesia (PCA) and/or nurse-controlled analgesia (NCA) over a 22-year period.

METHODS

After institutional review board approval, retrospective data from a single tertiary-care pediatric hospital were collected between 1994 and 2016. Subgroup analyses were done for surgical and medical case patients. We reported the number of times that PCA and/or NCA was ordered annually, the median and interquartile ranges for age, PCA and/or NCA duration and length of stay, and AE frequencies.

RESULTS

Over 22 years, 32 338 PCAs and/or NCAs were ordered in this institution. Morphine and hydromorphone were used most commonly. Between 1994 and 2006, initial orders for PCA and/or NCA increased 2.5-fold. After 2007, initial orders for PCA and/or NCA rapidly decreased; after 2013, the decrease continued at a slower rate, with a total of 1007 orders in 2016. This decrease occurred despite increased hospital admissions and surgeries. Between 2007 and 2012, peripheral nerve blocks rapidly increased (10-fold). After 2002, 146 AEs were reported (1.0%). Of those, 50.5% were nonintercepted, and 20.6% were intercepted AEs; 5.5% and 6.2% were preventable and nonpreventable AEs, respectively.

CONCLUSIONS

PCA and/or NCA usage continues to be common in pediatric patients, although usage has declined and stabilized in the setting of other emerging methods of analgesia and increases in the number of minimally invasive surgical procedures. The overall rate of AEs was extremely low. However, improvements to eliminate all errors are needed, especially with medications with a great risk of harm (such as opioids).

The association between continuous antibiotic prophylaxis and UTI from birth until initial postnatal imaging evaluation among newborns with antenatal hydronephrosis

INTRODUCTION

There is a lack of consensus regarding the use of continuous antibiotic prophylaxis (CAP) during the interval between birth and initial postnatal imaging in infants with a history of antenatal urinary tract dilation (AUTD).

OBJECTIVE

To determine the incidence of urinary tract infection (UTI), and the association between CAP use and UTI during the interval between birth and the first postnatal renal ultrasound (RUS) in infants with AUTD.

STUDY DESIGN

A single-institution, retrospective cohort study of newborns with a history of AUTD. Infants undergoing RUS within 3 months of birth for an indication of 'hydronephrosis' between 2012 and 2014 were identified. A random sample of 500 infants was selected; six were excluded for concomitant congenital anomalies. Baseline patient (sex, race, insurance) and clinical characteristics (circumcision status, UTD risk score, receipt of CAP, UTI prior to RUS, age at UTI, and age at RUS) were collected via retrospective chart review. Descriptive statistics were calculated. To adjust for receipt of CAP, propensity score adjusted univariate logistic regression for UTI based on CAP status was performed.

RESULTS

Among the 494 infants with AUTD, 157 (32%) received CAP. Infants with normal/low-risk UTD scores were less likely to receive CAP than those with medium/high-risk UTD (23% vs 77%; P < 0.001). There was no difference in CAP based on sex, insurance, or circumcision status (among 260/365 males with known circumcision status). Overall, seven infants (1.4%) developed UTI prior to imaging: six (1.8%) without CAP vs one (0.64%) with CAP (P = 0.44). The median age at UTI was 59 days (range 2-84); among those with UTI, initial imaging occurred significantly later (66 vs 28 days; P = 0.001). The propensity score adjusted odds of developing UTI with CAP (vs without) was 0.93 (95% CI 0.10-8.32; P = 0.95). The Summary Figure describes the infants with UTI.

CONCLUSION

The incidence of UTI prior to initial neonatal imaging in newborns with AUTD was low. Use of CAP was not associated with UTI incidence after adjusting for UTD severity. Routine use of CAP in newborns with AUTD prior to initial imaging may be of limited benefit in most patients.

Has the robot caught up? National trends in utilization, perioperative outcomes, and cost for open, laparoscopic, and robotic pediatric pyeloplasty in the United States from 2003 to 2015

INTRODUCTION

Since 2010, there have been few new data comparing perioperative outcomes and cost between open (OP) and robotic pyeloplasty (RP). In a post-adoption era, the value of RP may be converging with that of OP.

OBJECTIVE

To 1) characterize national trends in pyeloplasty utilization through 2015, 2) compare adjusted outcomes and median costs between OP and RP, and 3) determine the primary cost drivers for each procedure.

STUDY DESIGN

We performed a retrospective cohort study using the Premier database, which provides a nationally representative sample of U.S. hospitalizations between 2003 and 2015. ICD9 codes and itemized billing were used to abstract our cohorts. Trends in utilization and cost were calculated and then stratified by age. We used propensity scores to weight our cohorts and then applied regression models to measure differences in the probability of prolonged operative time (pOT), prolonged length of stay (pLOS), complications, and cost.

RESULTS

During the study period 11,899 pyeloplasties were performed: 75% open, 10% laparoscopic, and 15% robotic. The total number of pyeloplasty cases decreased by 7% annually; OP decreased by a rate of 10% while RP grew by 29% annually. In 2015, RP accounted for 40% of cases. The largest growth in RPs was among children and adolescents. The average annual rate of change in cost for RP and OP was near stagnant: -0.5% for open and -0.2% for robotic. The summary table provides results from our regression analyses. RP conferred an increased likelihood of pOT, but a reduced likelihood of pLOS. The odds of complications were equivalent. RP was associated with a significantly higher median cost, but the absolute difference per case was $1060.

DISCUSSION

Despite advantages in room and board costs for RP, we found that the cost of equipment and OR time continue to make it more expensive. Although the absolute difference may be nominal, we likely underestimate the true cost because we did not capture amortization, hidden or down-stream costs. In addition, we did not measure patient satisfaction and pain control, which may provide the non-monetary data needed for comparative value.

CONCLUSION

Despite an overall decline in pyeloplasties, RP utilization continues to increase. There has been little change in cost over time, and RP remains more expensive because of equipment and OR costs. The robotic approach confers a reduced likelihood of pLOS, but an increased likelihood of pOT. Complication rates are low and similar in each cohort.

Urology mythbusters: Radiation and radiophobia

In this episode of Mythbusters we critically examine the premise that there is strong biological and epidemiologic evidence that radiation exposure at levels associated with modern genitourinary diagnostic imaging increases the risk of subsequent malignancy, especially in children.

Minor procedure, major impact: Patient-reported outcomes following urethral meatotomy

INTRODUCTION

Urethral meatotomy as treatment for meatal stenosis is a common pediatric urology procedure; however, little is known about the patient experience following this procedure.

OBJECTIVE

We aim to evaluate clinical factors associated with patient-reported symptom improvement after urethral meatotomy.

STUDY DESIGN

The families of boys undergoing urethral meatotomy between 2/2013 and 8/2016 received a survey by mail 6 weeks after surgery. Families were queried on changes in symptoms using a Likert-type scale (5 = much improved, 4 = somewhat improved, 3 = no change, 2 = somewhat worse, and 1 = much worse). Patient and procedure characteristics of the respondents were obtained via chart review. These included surgical indication(s) (abnormal stream, dysuria, or storage symptoms), postoperative complications, reoperation, and unplanned postoperative communications. Patients who had procedures other than simple urethral meatotomy were excluded. Descriptive statistics were compiled, and generalized estimating equations used to determine the associations of patient and procedure characteristics with symptom improvement.

RESULTS

We sent 629 surveys and received 194 responses (30.4%). Twelve respondents were excluded for complex procedures or miscoding. The majority of respondents were privately insured (74%) and were between 5 and 12 years old (45%) or 1 and 4 years old (42%). The most frequent surgical indication was abnormal stream (72%) followed by pain (21%) and storage symptoms (15.5%). Nine respondents had minor complications (4.9%). Four patients had restenosis requiring repeat urethral meatotomy. After surgery, a majority (79%) were "much improved," 16% were "somewhat improved," 3% had "no change," and 1% were "somewhat worse." No family reported "much worse." Those patients who had "abnormal stream" as a surgical indication were significantly more likely to report "much improved" (OR 1.83, p = 0.014) than those without. Patient-reported improvement was not associated with suture use, patient age, insurance, surgeon, or location of the procedure (Table).

DISCUSSION

Little has been written about patient-reported outcomes following urethral meatotomy. Our study affirms that the majority of boys improve following this procedure. However, improvement is significantly more likely if the child has a preoperative indication of an abnormal stream, such as deflection or spraying. Boys with symptoms of dysuria, frequency, or incontinence may be experiencing sequelae of meatal stenosis that simply take longer to improve. Alternatively, the meatal stenosis may be incidental to the primary symptoms.

CONCLUSIONS

A majority of families report substantial symptomatic improvement after urethral meatotomy. However, boys undergoing urethral meatotomy for reasons other than a urinary stream abnormality are less likely to experience improvement.

Whole exome sequencing frequently detects a monogenic cause in early onset nephrolithiasis and nephrocalcinosis

The incidence of nephrolithiasis continues to rise. Previously, we showed that a monogenic cause could be detected in 11.4% of individuals with adult-onset nephrolithiasis or nephrocalcinosis and in 16.7-20.8% of individuals with onset before 18 years of age, using gene panel sequencing of 30 genes known to cause nephrolithiasis/nephrocalcinosis. To overcome the limitations of panel sequencing, we utilized whole exome sequencing in 51 families, who presented before age 25 years with at least one renal stone or with a renal ultrasound finding of nephrocalcinosis to identify the underlying molecular genetic cause of disease. In 15 of 51 families, we detected a monogenic causative mutation by whole exome sequencing. A mutation in seven recessive genes (AGXT, ATP6V1B1, CLDN16, CLDN19, GRHPR, SLC3A1, SLC12A1), in one dominant gene (SLC9A3R1), and in one gene (SLC34A1) with both recessive and dominant inheritance was detected. Seven of the 19 different mutations were not previously described as disease-causing. In one family, a causative mutation in one of 117 genes that may represent phenocopies of nephrolithiasis-causing genes was detected. In nine of 15 families, the genetic diagnosis may have specific implications for stone management and prevention. Several factors that correlated with the higher detection rate in our cohort were younger age at onset of nephrolithiasis/nephrocalcinosis, presence of multiple affected members in a family, and presence of consanguinity. Thus, we established whole exome sequencing as an efficient approach toward a molecular genetic diagnosis in individuals with nephrolithiasis/nephrocalcinosis who manifest before age 25 years.

Bladder debris on renal and bladder ultrasound: A significant predictor of positive urine culture

BACKGROUND

Renal and bladder ultrasound (RBUS) is recommended in evaluation of children after an initial, febrile urinary tract infection. Although it is not uncommon to observe debris within the bladder lumen on sonography, the significance of this finding is uncertain. Debris may be interpreted as an indication of ongoing infection, but there have been no studies to date investigating the association of bladder debris with a positive culture.

OBJECTIVE

The aim of this study was to evaluate the association of bladder debris noted at the time of RBUS with positive urine culture results obtained from a catheterized specimen, among patients undergoing RBUS and voiding cystourethrogram (VCUG) on the same day.

STUDY DESIGN

We performed a retrospective cross-sectional study of 3995 patients who presented for same-day RBUS and VCUG. RBUS reports were reviewed for the presence of bladder debris, and analysis was limited to patients under 60 months of age with a catheterized urine specimen sent for culture at the time of the studies. Those with prior postnatal imaging or a diagnosis of prenatal hydronephrosis or other GU abnormalities were excluded. Thirty-four subjects with bladder debris on RBUS were identified and matched to 155 controls based on age, gender, circumcision status, and presence of vesicoureteral reflux. A positive urine culture was defined as ≥50,000 colony forming units per mL of at least one organism. A conditional logistic regression model was used to evaluate the association between debris on RBUS and positive urine culture results.

RESULTS

In conditional logistic regression stratifying by matching age, gender, circumcision status, and presence of vesicoureteral reflux, there was a statistically significant association between bladder debris on RBUS and positive urine culture result collected on the same day during VCUG (OR 7.88, 95% CI 1.88-33.04, p = 0.0048). This corresponds to a 688% increase in odds of positive urine culture for patients with debris (Table).

DISCUSSION

This is the first study to evaluate the association between bladder debris on RBUS and positive urine culture, and it should serve as a starting point for future investigations. The study is limited in its generalizability to the sampled population; further work should evaluate the predictive value of RBUS debris among children without UTI history, with prior imaging or known genitourinary anomalies, or older children.

CONCLUSION

Among children younger than 60 months old undergoing initial imaging for history of UTI, there is a significant association between bladder debris and a positive urine culture.