Novel use of contrast enhanced ultrasonography with urodynamics in children: A comparison study to fluoroscopy.

INTRODUCTION: Video urodynamics (UDS) has classically been performed using fluoroscopy (fluoro). Contrast enhanced voiding ultrasonography (ceVUS) has rarely been reported for use with UDS. This is the first study to compare the imaging characteristics of ceVUS versus fluoro UDS. METHODS: Children were enrolled for ceVUS UDS who previously underwent fluoro UDS. Demographics, imaging data for ceVUS and fluoro UDS, time between studies, and clinical data between studies were recorded. Changes in clinical status included implantation/cessation of catheterization or anticholinergic medications, leakage between, urinary tract infections, hydronephrosis and neurologic changes. Comparison testing was performed using McNemar's Chi-Squared and Wilcoxon matched-pairs signed rank test. RESULTS: Seventy-five children were recruited. Median time between studies was 1.3 years (IQR 0.9-2.9). There were no differences for bladder shape (p = 0.59), vesicoureteral reflux (p = 0.10), bladder neck (p = 0.59) or urethra (p = 1.0) between studies. In 5 cases, the bladder neck could not be visualized adequately due to layering of the microbubble contrast against urine. Benefits to ceVUS included ability to visualize the exact moment the bladder neck opened. Following exclusion of patients with clinical changes that might affect imaging findings, an analysis of 28 patients demonstrated no differences between the two studies. CONCLUSIONS: CeVUS can be used adequately in conjunction with UDS. Limitations to ceVUS include more granular imaging for bladder shape versus fluoro and inability to visualize bladder neck if residual urine is in the bladder, mitigated by bladder emptying. Benefits include ability to visualize the dynamic activity of the bladder neck due to constant imaging with ceVUS.

Parental perception of contrast enhanced voiding ultrasonography urodynamics vs fluoroscopic urodynamics.

INTRODUCTION/OBJECTIVES: Contrast enhanced voiding ultrasonography (ceVUS) has not been widely reported to be used during video urodynamics (UDS). We previously reported on the feasibility of this. In this study, we aimed to understand how parents perceived their child's experience of undergoing ceVUS during UDS compared to fluoroscopic (fluoro) UDS. METHODS: Children who underwent both fluoro UDS and ceVUS UDS were recruited. Parents were asked to complete a questionnaire to evaluate their experience with both studies. Demographics including gender, age at study, and diagnosis were collected to account for differences in perception. Statistical analysis was performed. RESULTS: 53 patients were included: 31 girls, 22 boys. Diagnoses included myelomeningocele (67.9%), low/tethered cord (13.2%), closed spinal dysraphism (9.4%), posterior urethral valve (1.9%), cloacal anomaly (1.9%), caudal regression (1.9%), myeloschisis (1.9%), and cerebral palsy (1.9%). There was no statistical difference in mean age at fluoro UDS and ceVUS UDS (77.3 months vs 99.7 months respectively, p = 0.09). All 53 parents (100%) were satisfied/very satisfied with their ceVUS experience; 48 parents (90.6%) preferred ceVUS, 3 parents (5.7%) preferred fluoro UDS, and 2 (3.8%) were neutral. On average, parents perceived ceVUS to be more comfortable (72.7%) and produce better results (67.4%) than fluoro UDS. The majority felt that both studies allowed the same contact with their child (52.3%) and took the same amount of time (50.0%). However 29.5% felt ceVUS was faster and 34.1% felt ceVUS allowed more contact with their child (Fig. 1). 26 parents (49.1%) specifically noted no radiation as the reason why they preferred ceVUS over fluoro. The average age at ceVUS UDS was younger in those who preferred ceVUS UDS compared to those who preferred fluoro UDS (94.6 months vs 180.0 months, p = 0.03). The average age at fluoro UDS was younger in those who preferred ceVUS UDS vs fluoro UDS (73.1 months vs 144 months, p = 0.03). Gender's influence on preference approached significance (p = 0.07); all 3 parents who preferred fluoro UDS had male children. CONCLUSIONS: The majority of parents preferred ceVUS over fluoro UDS. ceVUS was perceived to be more comfortable and provide better results. Many parents highlighted no radiation and no fluoroscopic machinery as factors in preference of ceVUS over fluoro. The parents who preferred ceVUS UDS had children who had both studies done at an earlier age compared to the parents who preferred fluoro UDS.

Viability of contrast-enhanced voiding urosonography as an alternative to fluoroscopy during video urodynamics.

Pediatric urodynamic studies are performed to evaluate bladder function, commonly in conjunction with a voiding cystourethrogram (VCUG). Contrast-enhanced voiding urosonography (CeVUS) has been approved in the evaluation of vesicoureteral reflux and has been shown to have equal or superior diagnostic value to VCUG. In this technical innovation, we have shown that ultrasound contrast agent microbubbles are compatible with the equipment used for urodynamic evaluation. We have also shown that it is feasible to use contrast ultrasound in pediatric urodynamic examinations. The purpose of our study was to assess the technical feasibility of CeVUS during urodynamics with an in vitro test followed by a vivo evaluation. This single-center prospective study enrolled 25 patients aged 0-18 years who underwent CeVUS instead of VCUG at their regularly scheduled appointment. During the in vitro saline experiment, the radiologic and urologic equipment were found to be compatible. Microbubbles were observed at flow rates of 10 and 20 ml/min.

Celda: a Bayesian model to perform co-clustering of genes into modules and cells into subpopulations using single-cell RNA-seq data.

Single-cell RNA-seq (scRNA-seq) has emerged as a powerful technique to quantify gene expression in individual cells and to elucidate the molecular and cellular building blocks of complex tissues. We developed a novel Bayesian hierarchical model called Cellular Latent Dirichlet Allocation (Celda) to perform co-clustering of genes into transcriptional modules and cells into subpopulations. Celda can quantify the probabilistic contribution of each gene to each module, each module to each cell population and each cell population to each sample. In a peripheral blood mononuclear cell dataset, Celda identified a subpopulation of proliferating T cells and a plasma cell which were missed by two other common single-cell workflows. Celda also identified transcriptional modules that could be used to characterize unique and shared biological programs across cell types. Finally, Celda outperformed other approaches for clustering genes into modules on simulated data. Celda presents a novel method for characterizing transcriptional programs and cellular heterogeneity in scRNA-seq data.

Long-term Outcomes After Gender-Affirming Surgery: 40-Year Follow-up Study.

BACKGROUND: Gender dysphoria is a condition that often leads to significant patient morbidity and mortality. Although gender-affirming surgery (GAS) has been offered for more than half a century with clear significant short-term improvement in patient well-being, few studies have evaluated the long-term durability of these outcomes. METHODS: Chart review identified 97 patients who were seen for gender dysphoria at a tertiary care center from 1970 to 1990 with comprehensive preoperative evaluations. These evaluations were used to generate a matched follow-up survey regarding their GAS, appearance, and mental/social health for standardized outcome measures. Of 97 patients, 15 agreed to participate in the phone interview and survey. Preoperative and postoperative body congruency score, mental health status, surgical outcomes, and patient satisfaction were compared. RESULTS: Both transmasculine and transfeminine groups were more satisfied with their body postoperatively with significantly less dysphoria. Body congruency score for chest, body hair, and voice improved significantly in 40 years' postoperative settings, with average scores ranging from 84.2 to 96.2. Body congruency scores for genitals ranged from 67.5 to 79 with free flap phalloplasty showing highest scores. Long-term overall body congruency score was 89.6. Improved mental health outcomes persisted following surgery with significantly reduced suicidal ideation and reported resolution of any mental health comorbidity secondary to gender dysphoria. CONCLUSION: Gender-affirming surgery is a durable treatment that improves overall patient well-being. High patient satisfaction, improved dysphoria, and reduced mental health comorbidities persist decades after GAS without any reported patient regret.

Feasibility of establishing a multi-center research database using the electronic health record: The PURSUIT network.

BACKGROUND: Although multi-center research is needed in pediatric urology, collaboration is impeded by differences in physician documentation and research resources. Electronic health record (EHR) tools offer a promising avenue to overcome these barriers. OBJECTIVE: To assess the accuracy, completeness, and utilization of structured data elements across multiple practices. STUDY DESIGN: A standardized template was developed and implemented at five academic pediatric urology practices to document clinic visits for patients with congenital hydronephrosis and/or vesicoureteral reflux. Data from standardized elements in the template and from pre-existing EHR fields were extracted into a secure database. A 20% random sample of infants with data from structured elements from 1/1/2020 and 4/30/2021 were identified and compared to manual chart review at sites with >100 charts; all other sites reviewed at least 20 charts. Manual chart review was standardized across sites and included: clinic and operative notes, orders linked to the clinic encounter, radiology results, and active medications. Accuracy of data extraction was evaluated by computing the kappa statistic and percentage agreement. For sites that had adopted the templates prior to 6/1/2019 (early adopters), a list of eligible patients with an initial clinic visit from 1/1/2020-7/27/2020 was generated using standardized reporting techniques and confirmed by manual chart review. Physician utilization of the template was then calculated by comparing patients with data obtained from the note template to the generated list of eligible patients. RESULTS: 230 patient records met study criteria. Agreement between manual chart review and data extracted from the EHR was high (>85%). Race, ethnicity and insurance data were misclassified in about 10-15% of cases; this was due to site-specific differences in how these fields were coded. Renal ultrasound was misclassified 12% of the time; this was primarily due to outside images documented in radiology results but not included in the clinical note. All other data elements had >90% agreement (Figure). Template utilization for early adopters was >75% (75.5-87.5%). DISCUSSION: This is the first study in urology to demonstrate that use of structured data elements can support multi-center research. Limitations include: inclusion of only academic sites with the Epic EHR and lack of data on utilization and sustainability at sites without a prior history of structured template use. CONCLUSIONS: Multi-center research collaboration using EHR-based data collection tools is feasible with generally high accuracy compared to manual chart review. Additionally, sites with a long history of template adoption have high levels of provider utilization.

Pyeloplasty with ureteral stent placement in children: Do prophylactic antibiotics serve a purpose?

OBJECTIVES: Ureteral stents are commonly used during pyeloplasty to ensure drainage and anastomotic healing. Antibiotic prophylaxis is often used due to concerns for urinary tract infection (UTI). Although many surgeons prescribe prophylactic antibiotics following pyeloplasty, practices vary widely due to lack of clear evidence-based guidelines. We hypothesize that the rate of stent UTI does not significantly vary between children who receive antibiotics and those who do not. METHODS: We reviewed the medical records of 741 patients undergoing pyeloplasty between January 2010 and July 2018 across seven institutions. Exclusion criteria were: age older than 22 years, no stent placed, externalized stents used, and incomplete records. Surgical approach, age, antibiotic use, stent duration, Foley duration, and urine culture results were recorded. Patients were categorized into two groups, those younger than four years of age and those four years and older as proxy for likely diaper use. Univariate logistic regression was conducted to identify variables associated with UTI. Multivariable backward stepwise logistic regression was used to identify the best model with Akaike information criterion as model selection criteria. The selected model was used to calculate odds ratios and 95% confidence intervals summarizing the association between prophylactic antibiotics and stent UTI while controlling for age, gender, and intra-operative urine cultures. RESULTS: 672 patients were included; 338 received antibiotic prophylaxis and 334 did not. These groups differed in mean age (3.91 vs. 6.91 years, P < .001), mean stent duration (38.5 vs. 35.32 days, P < .001), and surgical approach (53.25% vs. 32.04% open vs. laparoscopic, P < .001). The incidence of stent UTI was low overall (7.59%) and similar in both groups: 31/338 (9.17%) in the prophylaxis group and 20/334 (5.99%) in the non-prophylaxis group (P = .119). Although female gender, likely diaper use, and positive intra-operative urine culture were each associated with significantly higher odds of stent UTI, prophylactic antibiotic use was not associated with significant reduction in stent UTI in any of these groups. Surgical approach, stent duration, and Foley duration were not associated with stent UTI. CONCLUSION: Incidence of stent UTI is low overall following pyeloplasty. Prophylactic antibiotics are not associated with lower rates of stent UTI following pyeloplasty even after controlling for risk factors of female gender, likely diaper use, and positive intra-operative urine culture. Routine administration of prophylactic antibiotics after pyeloplasty does not appear to be beneficial, and may be best reserved for those with multiple risk factors for UTI.

Benefits and barriers to pediatric tele-urology during the COVID-19 pandemic.

INTRODUCTION: Telemedicine video visits are an under-utilized form of delivering health care. However due to the COVID-19 pandemic, practices are rapidly adapting telemedicine for patient care. We describe our experience in rapidly introducing video visits in a tertiary academic pediatric urology practice, serving primarily rural patients during the COVID-19 pandemic. OBJECTIVE: The primary aim of this study was to assess visit success rate and identify barriers to completing video visits. The secondary aim identified types of pathologies feasible for video visits and travel time saved. We hypothesize socioeconomic status is a predictor of a successful visit. MATERIALS AND METHODS: Data was prospectively collected and analyzed on video visits focusing on visit success, defined by satisfactory completion of the visit as assessed by the provider. Other variables collected included duration, video platform and technical problems. Retrospective data was collected via chart review and analyzed including demographics, insurance, and distance to care. Socioeconomic status was estimated using the Distressed Communities Index generated for patient zip code. RESULTS/DISCUSSION: Out of 116 attempted visits, 81% were successful. The top two reasons for failure were "no-show" (64%) and inability to connect (14%). Success versus failure of visit was similar for patient age (p = 0.23), sex (p = 0.42), type of visit (initial vs. established) (p = 0.51), and socioeconomic status (p = 0.39). After adjusting for race, socioeconomic status, and type of provider, having public insurance remained a significant predictor of failure (p = 0.017). Successful visits were conducted on multiple common pediatric urologic problems (excluding visits requiring palpation on exam), and video was sufficient for physical exams in most cases (Summary Table). A median of 2.25 h of travel time was saved. CONCLUSIONS: While socioeconomic status, estimated using the Distressed Communities Index, did not predict success of video visits, patients with public insurance were more likely to have a failed video visit. There is compelling evidence that effective video visits for certain pathologies can be rapidly achieved in a pediatric urology practice with minimal preparation time.

Usability and safety of the new 5 French air-charged catheter for performing urodynamic studies on pediatric patients.

AIMS: To assess the performance and safety of the T-DOC® 5 French air-charged urodynamic catheters in pediatric patients and obtain feedback from providers related to usability performance. METHODS: Patients ages 12 years and younger undergoing urodynamics were prospectively recruited from two institutions. The T-DOC® 5 French air-charged catheters were used. Issues with catheter placement, adverse events (AEs), and pain scores were assessed. A follow-up telephone call was made to assess for post-urodynamic AEs. Providers completed a clinical user questionnaire. Likert scale was used (1 = most negative and 5 = most positive response) and reported in mean (range). RESULTS: A total of 28 patients completed the study. The mean age was 55 months (5-130) (10 females, 18 males). One problem was noted with the insertion of an abdominal catheter, secondary to stool impaction. Catheters stayed in place on all subjects, except for one related to patient hyperactivity. There were no AEs during the studies. In total four reported post-urodynamics AEs (one hematochezia, three dysuria). Among nine patients, pain level on the bladder and abdominal insertion was 3.6/10 (0-10) and 3.1/10 (0-10). Five providers completed the questionnaire. The overall ease of use was rated 4.3/5 (3-5). The ease of insertion was 4.1/5 (2-5) and set-up/clean-up time was 4.4/5 (3-5). Tracing stability, subtraction accuracy, and artifact sensitivity were all perceived favorably (respectively 4.8/5 [4-5], 4.6/5 [4-5], and 4.4/5 [4-5]). CONCLUSIONS: The T-DOC® 5 French air-charged catheter was considered safe and effective in pediatric patients. No AEs occurred during the studies. Providers, using the catheters, reported favorably on catheter usage.

Parental perception of bladder spasms and hematuria after surgery for vesicoureteral reflux: A prospective multicenter study.

INTRODUCTION: Anti-reflux surgery success has been well-documented in the literature. Little data exists about the characterization of the child's symptoms regarding pain, bladder spasms, and hematuria following these procedures. These symptoms may affect the choice of surgery for families and providers. OBJECTIVE: To characterize parent's perception of recovery from surgery and preparedness for recovery from surgery. We hypothesized that parents of children undergoing open intravesical reimplantation (Open) would report a higher incidence of bladder spasms and hematuria compared to children undergoing robotic extravesical reimplantation (RALR) or endoscopic treatment (DxHA). STUDY DESIGN: A 20-question survey was developed to assess perception of recovery preparedness, pain, and symptoms. Parents completed the survey at a follow-up visit occurring 3-6 weeks post-discharge. Chi-square and t-test or their non-parametric equivalents were used for between-group comparisons. RESULTS: Participating were three institutions and eleven surgeons. Eighty-four parents completed the survey a median of 33 days (IQR 27-40) post-surgery. More parents reported bladder spasms and hematuria in the Open group vs RALR and DxHA. Although there was no difference in maximum bladder spasm pain, duration of pain medication for spasms was longer with Open vs RALR. Most parents (87%) reported they were prepared for their child's symptoms after surgery. Approximately one-quarter of parents whose child underwent Open (33%) or RALR (36%) reported the bladder spasms were more painful than expected, and almost half of parents whose child underwent Open (49%) reported hematuria was worse than expected. DISCUSSION: We found that Open had significantly worse parental reports of bladder spasms, pain medication usage, and severity of hematuria than RALR and DxHA. Although most parents said they were prepared for their child's recovery, many reported the symptoms were worse than expected. These contradictions may reflect a need for improved physician to parent communication when discussing anti-reflux surgery.

Decontamination of ambient RNA in single-cell RNA-seq with DecontX.

Droplet-based microfluidic devices have become widely used to perform single-cell RNA sequencing (scRNA-seq). However, ambient RNA present in the cell suspension can be aberrantly counted along with a cell's native mRNA and result in cross-contamination of transcripts between different cell populations. DecontX is a novel Bayesian method to estimate and remove contamination in individual cells. DecontX accurately predicts contamination levels in a mouse-human mixture dataset and removes aberrant expression of marker genes in PBMC datasets. We also compare the contamination levels between four different scRNA-seq protocols. Overall, DecontX can be incorporated into scRNA-seq workflows to improve downstream analyses.

Tele-Urology During COVID-19: Rapid Implementation of Remote Video Visits.

INTRODUCTION: COVID-19 has brought unprecedented challenges to the delivery of urological care. Following rapid implementation of remote video visits at our tertiary academic medical center serving a large rural population we describe and assess our experience with planned video visits and ongoing scheduling efforts. METHODS: Patients scheduled for video visits between April 14 and April 27, 2020 were included. Prospective and retrospective data were collected on patient and clinical characteristics as well as telemedicine outcomes. Multivariable logistic regression was performed to evaluate factors influencing video visit success. Concurrently scheduling data were collected from a separate cohort regarding patient access to technology and willingness to participate in video visits. RESULTS: A total of 209 patients were included with an overall video visit success rate of 67%. Of video visits that failed (69) reasons included no-show (35%), inability to connect to the telemedicine platform (23%) and lack of Internet access (10%). Nearly half of failed video visits (46.4%) were completed as phone visits. After adjustment for patient demographics commercial insurance was significantly associated with video visit success. In assessment of scheduling outcomes 179 patients were contacted to offer video visits. Of these patients 6.7% reported not having Internet access. Of those with Internet access 87% agreed to proceed with a video visit in lieu of visiting in person. CONCLUSIONS: Our experience indicates that rapid implementation of video telemedicine is feasible and highly accepted by patients. Efforts focused on standardized pre-visit patient education may further optimize successful telemedicine visits.

Identifying and addressing training deficiencies in the examination of cryptorchidism-a quality improvement study.

BACKGROUND: Accurate and timely diagnosis of cryptorchidism by primary care providers (PCPs) is critical to oncologic and fertility outcomes. Physical exam is the mainstay of diagnosis, but little is known about PCPs' skills in examining cryptorchid patients. Patients referred to surgeons for cryptorchidism often have normal or retractile testes on exam, and delayed or missed diagnosis of cryptorchidism may contribute to advanced age at surgical intervention. Previous studies on cryptorchidism have not investigated the baseline training, confidence, and/or exam skills of providers. OBJECTIVE: The authors aimed to define baseline training and provider confidence in the exam of cryptorchid patients and to improve examiner confidence using bedside teaching with a pediatric urologist. Secondarily, baseline training and confidence were correlated to skill. STUDY DESIGN: Medical students, family medicine, pediatrics, and urology residents, and pediatric attendings completed surveys on baseline training and self-reported confidence in the examination of cryptorchid patients at an academic institution from 2017 to 2018. N.G.K. (pediatric urologist) proctored examinations of cryptorchid patients and provided standardized grades and individualized feedback. Surveys were readministered after 3 months. Non-parametric comparison tests were performed to determine intervention effect and compare subgroups. RESULTS: Ninety-two respondents participated. 62% reported little to no formal training on the scrotal exam, 50% were self-taught, and 20% defined undescended testis incorrectly. Confidence increased with level of training, comparing attendings to residents to students (P < 0.001). Those who learned from a mentor had higher baseline confidence than those who did not (P < 0.01). Baseline confidence and amount of formal training positively correlated with exam skill as graded during proctored sessions (n = 59, P < 0.01). Provider confidence was higher after proctored exams (Fig. 2, n = 32, P < 0.0001). DISCUSSION: Significant training deficiencies exist in the examination of cryptorchid patients. A single proctored exam with a pediatric urologist can improve provider confidence and may improve exam skills. A rotation with pediatric urology, including proctored exams of cryptorchid patients, has become standard practice for pediatric trainees at the authors institution as a result of this study. CONCLUSIONS: While further studies are required to assess the effectiveness of bedside teaching and its impact on accurate and timely diagnosis of cryptorchidism, implementation of the authors quality improvement recommendations at other teaching institutions would help address training deficiencies in the examination of cryptorchid patients.

Complementary and Integrative Management of Pediatric Lower Urinary Tract Dysfunction Implemented within an Interprofessional Clinic.

Lower urinary tract dysfunction in children is a common multifactorial functional problem that often correlates with bowel dysfunction and behavioral disorders. Ideal management combines integrative therapies that optimize bladder and bowel habits, address behavioral issues, foster mind-body connection, and improve pelvic floor muscle dysfunction. Movement therapies that teach diaphragmatic breathing and relaxation, mind-body awareness, and healthy pelvic floor muscle function are vital for long-term symptom improvement in children. This paper outlines recommendations for integrative management of these patients and discusses a recently developed interprofessional clinic that aims to better meet these patients' complex needs and to provide patients with an integrated holistic plan of care. Additional work is needed to scientifically assess these treatment models and educate providers across the various disciplines that evaluate and treat these patients.

Gene Expression Alterations in the Bronchial Epithelium of e-Cigarette Users.

BACKGROUND: Although e-cigarette (ECIG) use has increased in the United States, their potential health effects remain uncertain. Understanding the effects of tobacco cigarette (TCIG) smoke on bronchial airway epithelial gene expression have previously provided insights into tobacco-related disease pathogenesis. Identifying the impact of ECIGs on airway gene expression could provide insights into their potential long-term health effects. We sought to compare the bronchial airway gene-expression profiles of former TCIG smokers now using ECIGs with the profiles of former and current TCIG smokers. METHODS: We performed gene-expression profiling of bronchial epithelial cells collected from current TCIG smokers (n = 9), current ECIG users who are former TCIG smokers (n = 15), and former TCIG smokers (n = 21). We then compared our findings with previous studies of the effects of TCIG use on bronchial epithelium, as well an in vitro model of ECIG exposure. RESULTS: Among 3,165 genes whose expression varied between the three study groups (q < 0.05), we identified 468 genes altered in ECIG users relative to former smokers (P < .05). Seventy-nine of these genes were up- or down-regulated concordantly among ECIG and TCIG users. We did not detect ECIG-associated gene-expression changes in known pathways associated with TCIG usage. Genes downregulated in ECIG users are enriched among the genes most downregulated by exposure of airway epithelium to ECIG vapor in vitro. CONCLUSIONS: ECIGs induce both distinct and shared patterns of gene expression relative to TCIGs in the bronchial airway epithelium. The concordance of the genes altered in ECIG users and in the in vitro study suggests that genes altered in ECIG users are likely to be changed as the direct effect of ECIG exposure.

Unenhanced MRI as an Alternative to 99mTc-Labeled Dimercaptosuccinic Acid Scintigraphy in the Detection of Pediatric Renal Scarring.

OBJECTIVE: The purpose of this study was to determine whether unenhanced MRI without sedation is a feasible substitute for dimercaptosuccinic acid (DMSA) scintigraphy in the detection of renal scars in pediatric patients. SUBJECTS AND METHODS: Patients scheduled for 99mTc-labeled DMSA scintigraphy for assessment of possible renal scars were recruited to undergo unenhanced MRI (free-breathing fat-suppressed T2-weighted single-shot turbo spin-echo and T1-weighted gradient-echo imaging, 13 minutes' total imaging time). Scintigraphic and MRI studies were evaluated by two independent blinded specialty-based radiologists. For each imaging examination, readers identified scars in upper, middle, and lower kidney zones and rated their diagnostic confidence and the quality of each study. The scintigraphic readers' consensus score opinion for the presence of scars was considered the reference standard. RESULTS: DMSA scintigraphy showed scarring in 19 of the 78 (24.4%) evaluated zones and MRI in 18 of the 78 (23.1%). The two MRI readers found mean sensitivities of 94.7% and 89.5%, identical specificities of 100%, and diagnostic accuracies of 98.7% and 97.4%. Interobserver agreement was 98.7% for MRI and 92.3% for DMSA scintigraphy. The MRI readers were significantly more confident in determining the absence rather than the presence of scars (p = 0.02). MRI readers were more likely to rate study quality as excellent (84.6%) than were the scintigraphic readers (57.7%) (p = 0.024). CONCLUSION: Unenhanced MRI has excellent sensitivity, specificity, diagnostic accuracy, and interobserver agreement for detecting renal scars in older children who do not need sedation. It may serve as a substitute modality, especially when DMSA is not available.

A practice pattern assessment of members of the Society of Pediatric Urology for evaluation and treatment of urinary tract dilation.

INTRODUCTION: Over the last decade the literature, including a multidisciplinary consensus statement, has supported a paradigm shift in management of urinary tract dilation, yet the impact on practice patterns has not been well documented. OBJECTIVE: This study aims to elucidate specific practice patterns for treatment of prenatal unilateral urinary tract dilation and to assess surgical intervention patterns for ureteropelvic junction obstruction. STUDY DESIGN: An online survey was distributed to 234 pediatric urologists through the Society of Pediatric Urology. The survey was composed of five clinical case scenarios addressing evaluation and management of unilateral urinary tract dilation. RESULTS: The response rate was 71% (n = 168). Circumcision status, gender, and grade were significant factors in recommending prophylactic antibiotics for newborn urinary tract dilation. Prophylactic antibiotic use in the uncircumcised male and female was twice that of a circumcised male for grade 3 (Table). This difference was minimized for grade 4. Use of VCUG was high for circumcised males with grade 3 or 4 (Table). The choice of minimally invasive surgery for ureteropelvic junction repair increased with age from 19% for a 5-month-old, 49% for a 2-year-old, and 85% for a 10-year-old. Notably, 44% of respondents would observe a 10-year-old with intermittent obstruction. Retrograde pyelography was recommended in conjunction with repair in 65% of respondents. Antegrade stent placement was the most common choice (38-47%) for urinary diversion after pyeloplasty. Regarding postoperative imaging, only 5% opted for routine renal scan whereas most would perform renal ultrasound alone. DISCUSSION: Practice patterns seen for use of prophylactic antibiotics are in agreement with the literature, which promotes selective use in those at highest risk for urinary tract infections. Interestingly, use of aggressive screening was not concordant with this literature. Several studies have indicated an increased usage of robotic pyeloplasty; however, results indicate that minimally invasive surgery is not preferred in those younger than 6 months. Study limitations include use of clinical case scenarios as opposed to actual clinical practice. CONCLUSION: Practice patterns for prophylactic antibiotic use for neonatal urinary tract dilation are dependent on gender, circumcision status, and grade. The use of minimally invasive surgery for ureteropelvic junction repair increased with patient age, with 50% preferring this modality at 2 years.

24 Hour urine metabolic differences between solitary and multiple stone formers: Results of the Collaboration on Urolithiasis in Pediatrics (CUP) working group.

INTRODUCTION: Specific factors associated with the risk of developing pediatric urinary stone disease remain unclear, especially those that may be associated with recurrent stone disease. OBJECTIVE: We compared the results of 24-h urine collections in children with a solitary stone episode to those with multiple stone episodes to determine if there is a difference that may be associated with multiple stone formation in children. STUDY DESIGN: A multi-institutional retrospective analysis was completed to assess 24-h urinary metabolic profiles in children with urolithiasis aged 2-18 years old. Differences in mean urine collections between the two groups were assessed using chi-square tests to test the associations among gender, stone type, and multiple stone status, as well as multivariate analyses using general linear models. RESULTS: We analyzed 142 solitary stone patients and 136 multiple stone patients from four centers were included. Multiple stone patients were older than solitary stone patients (mean 13.4 ± 3.6 years vs. 12 ± 3.9 years, p = 0.002). Females were more likely to have multiple stones (58% vs. 39%, p = 0.002). BMI was not associated with multiple stones (p = 0.8467). Multiple stone formers had lower urine volumes, although this did not reach statistical significance when compared with solitary stone formation (20.4 mL/kg/day ± 11.5 vs. 22.9 ± 13.0, p = 0.0880). Higher values for super-saturation of calcium oxalate were associated with multiple stone disease in univariate (p = 0.0485) and multivariate analysis (p = 0.0469) (Figure). Centers located in the Southeast of the United States saw a higher proportion of children with multiple stones (Tennessee 62.7%, Virginia 44.4%, Oregon 31.6%, Michigan 27.3%, p < 0.0001). DISCUSSION: In a large multi-institutional retrospective analysis we found that multiple stone disease was associated with higher super-saturations of calcium oxalate. Many urinary parameters changed with patient age, highlighting that the values should be interpreted with respect to patient age. The inability to comment on follow-up because of the nature of our dataset is a limitation of this study. CONCLUSION: Multiple stone disease in children is associated with higher super-saturation calcium oxalate, while lower urinary volume may also be associated with multiple stones; however, further study is required. Early metabolic evaluation may help risk stratify children likely to form multiple stones.

Molecular Impact of Electronic Cigarette Aerosol Exposure in Human Bronchial Epithelium.

Little evidence is available regarding the physiological effects of exposure to electronic cigarette (ECIG) aerosol. We sought to determine the molecular impact of ECIG aerosol exposure in human bronchial epithelial cells (HBECs). Gene-expression profiling was conducted in primary grown at air liquid interface and exposed to 1 of 4 different ECIG aerosols, traditional tobacco cigarette (TCIG) smoke, or clean air. Findings were validated experimentally with quantitative polymerase chain reaction and a reactive oxygen species immunoassay. Using gene set enrichment analysis, signatures of in vitro ECIG exposure were compared with those generated from bronchial epithelial brushings of current TCIG smokers and former TCIG smokers currently using ECIGs. We found 546 genes differentially expressed across the ECIG, TCIG, and air-exposed groups of HBECs (ANOVA; FDR q < .05; fold change > 1.5). A subset of these changes were shared between TCIG- and ECIG-exposed HBECs. ECIG exposure induced genes involved in oxidative and xenobiotic stress pathways and increased a marker of reactive oxygen species production in a dose-dependent manner. ECIG exposure decreased expression of genes involved in cilia assembly and movement. Furthermore, gene-expression differences observed in vitro were concordant with differences observed in airway epithelium collected from ECIG users (q < .01). In summary, our data suggest that ECIG aerosol can induce gene-expression changes in bronchial airway epithelium in vitro, some of which are shared with TCIG smoke. These changes were generally less pronounced than the effects of TCIG exposure and were more pronounced in ECIG products containing nicotine than those without nicotine. Our data further suggest that the gene-expression alterations seen with the in vitro exposure system reflects the physiological effects experienced in vivo by ECIG users.

Delayed Partial Nephrectomy for Hydronephrosis After Renal Trauma.

Delayed sequelae following conservative management of renal trauma in the pediatric population are uncommon. Reports of delayed operations to manage these sequelae are even less common. Here we present the case of a 16-year-old male patient who had delayed development of upper urinary tract obstruction with recurrent infections following high-grade renal trauma managed conservatively. Ultimately, he required a robotic-assisted partial nephrectomy 2 years after initial nonoperative management. This is unique as no prior studies to our knowledge have described delayed hydronephrosis and delayed partial nephrectomy over a year following renal trauma.