Ovine uterine space restriction causes dysregulation of the renin-angiotensin system in fetal kidneys.

In ovine pregnancy, uterine space restriction (USR) resulting from decreased space for placental attachment caused intrauterine growth restriction and impaired nephrogenesis. The fetal kidney renin-angiotensin system (RAS) is involved in nephrogenesis, fluid balance, and iron deposition. Angiotensin II exerts its effects via multiple receptors: angiotensin II 1-8 receptor type 1 (AT 1 R) and type 2 (AT 2 R), and angiotensin II 1-7 Mas receptor (MASR). Objective: : To test the hypothesis that ovine USR is associated with dysregulation of the fetal renal RAS. Methods: : Multiparous pregnant ewes (n = 32), 16 with surgical bifurcated disconnection of one uterine horn to further reduce placental attachment sites, were studied. USR (n = 31) ovine fetuses were compared to nonspace restricted (NSR) singleton controls (n = 22) on gestational day (GD) 120 or GD130, term GD147. Fetal plasma was collected to evaluate plasma renin activity and iron indices. Fetal kidney AT 1 R, AT 2 R, and MASR proteins were assessed by Western immunoblotting and immunohistochemistry. Results: : AT 1 R, AT 2 R, and MASR protein expression was higher in USR at GD130 than aged-matched NSR and USR at GD120, ( P < 0.05 all). AT 1 R and AT 2 R localization was homogenous throughout proximal and distal tubules in both USR and NSR at both gestational dates. MASR localization was punctate throughout renal cortical structures including tubules and glomeruli in both USR and NSR, shifted to intranuclear at GD130. Plasma renin activity was inversely related to plasma osmolarity ( P < 0.02) and was downregulated in USR at GD130 ( P < 0.05). Conclusions: : By late gestation, USR upregulated renal angiotensin receptor expression, an effect with potential functional implications.

The Impact of a Scholarly Concentration Program on Medical Student Research in Pediatrics.

INTRODUCTION: To promote scientific inquiry, medical schools encourage medical students to participate in scholarly concentration programs (SCP). Manuscript publishing, a proxy of productivity, enhances medical student understanding of scientific inquiry. To evaluate an elective medical SCP offered between the first two years of medical school, the pediatrician authors' primary aim was to study the publishing productivity of the program participants in the University of Wisconsin (UW) School of Medicine and Public Health Department of Pediatrics compared to other departments. Secondary aims were to study whether productivity was influenced by the following predictors: (1) self-identified medical student gender, (2) working with a frequent mentor, (3) mentor degree, (4) funding source, and (5) area of research. METHODS: PubMed joint publications from 2002 through 2017 were searched using both medical student and mentor names through 2 years post-graduation. RESULTS: From all UW School of Medicine Public Health departments, 1108 medical students self-selected projects and mentors. One hundred two (9.2%) students chose the Department of Pediatrics. The majority of these students were female (61%) compared to female medical student participation (42%) in other departments (P = 0.0004). The majority of projects were clinical (53%), with basic science (26%) and public/global health (21%) following, though with more public/global health projects chosen in the Department of Pediatrics (P = 0.002) versus other departments. Overall, frequent mentors improved publication rates (P =0.0008), though frequent mentors (P = 0.45) and publication rates (P = 0.60) did not differ between pediatrics and other departments. CONCLUSIONS: Medical students' SCP manuscript productivity benefitted from working with frequent mentors, but productivity in the Department of Pediatrics did not differ from other departments.

Treatment of positive urine cultures in the neonatal intensive care unit: a guideline to reduce antibiotic utilization.

BACKGROUND: The pediatric definition of bacterial urinary tract infection (UTI) is >50,000 colony forming units (CFU) of a single organism on catheterized culture or 10,000-50,000 CFU with pyuria on urinalysis. LOCAL PROBLEM: The diagnosis of UTI in our NICU is clinician-dependent and not based on the accepted pediatric definition. METHODS: A retrospective review of positive urine cultures between 2015 and 2017 was performed. INTERVENTION: A treatment guideline for positive urine cultures was adopted and PDSA methodology utilized for incremental improvements. RESULTS: For 909 pre-intervention neonates, 26 of 38 positive urine cultures were treated for UTI but only 23% (6/26) met the pediatric definition. For 644 post-guideline neonates, only 7 of 25 positive urine cultures were treated and 86% met guideline criteria with no increase in urosepsis. CONCLUSIONS: A guideline to treat positive urine cultures resulted in a decreased rate of UTI diagnosis and thus prevented unnecessary antibiotic exposure.

Implementing point of care ultrasound in the neonatal intensive care unit: a safety study.

OBJECTIVE: Point of care ultrasound (POCUS) use is increasing in pediatrics and has been demonstrated to be superior in identifying central catheter tip location in neonatal intensive care units. However, limited data exist regarding cardiorespiratory changes secondary to POCUS in neonates. STUDY DESIGN: A prospective observational equivalence study was performed on 50 POCUS assessments of central catheter tip location in 46 patients ≥23 weeks gestation. Heart rate (HR), respiratory rate (RR), and percent oxygen saturation (SpO2) levels were collected before and after POCUS. Limits of equivalence were set in advance. RESULT: Equivalence was demonstrated in HR, RR, and SpO2 before and after POCUS. HR decreased by 3.24 beats per minute (90% CI: -5.36, -1.14). RR increased by 0.71 breath/min (90% CI: -1.84, +3.27). SpO2 increased by 0.54 percentage points (90% CI: -0.23, +1.31). CONCLUSION: Identifying central catheter tip location using POCUS in neonates appears safe without affecting cardiorespiratory stability.

Point-of-care ultrasound use in umbilical line placement: a review.

Point-of-care ultrasound (POCUS) has become a novel tool for assessing umbilical catheter tip location in the neonate. This review analyzes the current evidence on the efficacy and utility of POCUS for identifying umbilical catheter positioning. Medline, EMBASE, and Cochrane searches were performed until October 2018. Eight studies were identified comparing POCUS to x-ray in assessing umbilical catheter tip location in the last 10 years. POCUS was shown to be feasible and appears to be a superior imagining modality to x-rays in assessing umbilical line tip location. POCUS is more accurate in determining umbilical catheter positioning, allows for more rapid line umbilical catheter placement, and reduces the time to treatment as well as radiation exposure to the neonate when compared with x-ray. The available studies support further education in training neonatal providers to become proficient in POCUS for assessing umbilical lines.