SciCombinator

Discover the most talked about and latest scientific content & concepts.

Journal: Pediatric research

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Regular physical activity provides children with health and developmental benefits. This study investigated if active play and walking with the family dog was associated with better social-emotional development in young children.

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Background:In preterm infants, low levels of insulin-like growth factor-I (IGF-I) and IGF binding protein 3 (IGFBP-3) are associated with impaired brain growth and retinopathy of prematurity (ROP). Treatment with IGF-I/IGFBP-3 may be beneficial for brain development and may decrease the prevalence of ROP.Methods:In a phase II pharmacokinetics and safety study, five infants (three girls) with a median (range) gestational age (GA) of 26 wk + 6 d (26 wk + 0 d to 27 wk + 2 d) and birth weight of 990 (900-1,212) g received continuous intravenous infusion of recombinant human (rh)IGF-I/rhIGFBP-3. Treatment was initiated during the first postnatal day and continued for a median (range) duration of 168 (47-168) h in dosages between 21 and 111 µg/kg/24 h.Results:Treatment with rhIGF-I/rhIGFBP-3 was associated with higher serum IGF-I and IGFBP-3 concentrations (P < 0.001) than model-predicted endogenous levels. Of 74 IGF-I samples measured during study drug infusion, 37 (50%) were within the target range, 4 (5%) were above, and 33 (45%) were below. The predicted dose of rhIGF-I/rhIGFBP-3 required to establish circulating levels of IGF-I within the intrauterine range in a 1,000 g infant was 75-100 µg/kg/24 h. No hypoglycemia or other adverse effects were recorded.Conclusion:In this study, continuous intravenous infusion of rhIGF-I/rhIGFBP-3 was effective in increasing serum concentrations of IGF-I and IGFBP-3, and was found to be safe.

Concepts: Pregnancy, Childbirth, Embryo, Fetus, Obstetrics, Insulin-like growth factor 1, Growth hormone, IGFBP3

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Background:Fetal intrauterine growth restriction (IUGR) results in increased placental resistance to blood flow, fetal hypertension and increased pulsatility stresses shown to lead to vascular remodeling. We tested our hypothesis that IUGR causes decreased compliance in the carotid and umbilical arteries due to altered extracellular matrix (ECM) composition and structure.Methods:A sheep model of placental insufficiency-induced IUGR (PI-IUGR) was created by exposure of the pregnant ewe to elevated ambient temperatures. Umbilical and carotid arteries from near-term fetuses were tested with pressure-diameter measurements to compare passive compliance in control and PI-IUGR tissues. ECM composition was measured via biochemical assay, and the organization was determined by using histology and second-harmonic generation imaging.Results:We found that PI-IUGR increased arterial stiffness with increased collagen engagement, or transition stretch. PI-IUGR carotid arteries exhibited increased collagen and elastin quantity and PI-IUGR umbilical arteries exhibited increased sulfated glycosaminoglycans. Histomorphology showed altered collagen to elastin ratios with altered cellular proliferation. Increased stiffness indicates altered collagen to elastin ratios with less elastin contribution leading to increased collagen engagement.Conclusion:Because vessel stiffness is a significant predictor in the development of hypertension, disrupted ECM deposition in IUGR provides a potential link between IUGR and adult hypertension.Pediatric Research (2012); doi:10.1038/pr.2012.156.

Concepts: Pregnancy, Blood, Myocardial infarction, Embryo, Fetus, Obstetrics, Umbilical vein, Placenta

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BackgroundChronic rhinosinusitis (CRS) is characterized by mucous overproduction and submucosal gland hyperplasia. The global protein profile of sinonasal secretions in pediatric CRS has not been studied. We hypothesized that MUC5B, a glandular mucin, would be relatively increased in CRS secretions compared to other mucins.MethodsSecretions were collected at Children’s National Health System (Children’s National) from CRS patients undergoing sinus surgery and from control patients without CRS undergoing craniofacial procedures. Proteins were extracted, digested to peptides, and analyzed by mass spectometry. Fold change significance was calculated using the QSpec algorithm. Western blot analysis was performed to validate proteomic findings.ResultsIn total, 294 proteins were identified. Although both MUC5B and MUC5AC were identified in a majority of samples, the relative abundance of MUC5B was found to be significantly higher (p < 0.05). Western blot data validated these findings. Other proteins with the highest significant positive-fold change in CRS samples were BP1 fold-containing family A member 1, chitinase-3-like protein 1, plastin-2, serpin 10, and BP1 fold-containing family B member 1.ConclusionOverall our data demonstrates an increase of MUC5B abundance in the sinus secretions of pediatric patients with CRS.Pediatric Research (2014); doi:10.1038/pr.2014.187.

Concepts: Proteins, Protein, Molecular biology, Secretion, Western blot, Gel electrophoresis, Proteomics, Gland

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Heavy parent digital technology use has been associated with suboptimal parent-child interactions and internalizing/externalizing child behavior, but directionality of associations is unclear. This study aims to investigate longitudinal bidirectional associations between parent technology use and child behavior, and understand whether this is mediated by parenting stress.

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BackgroundSurgical treatment for gastroschisis and congenital diaphragmatic hernia (CDH) commonly leads to abdominal compartment syndrome (ACS) associated with hypoxic renal injury. We hypothesized that measurement of urinary and serum concentrations of VEGF, π-GST, and MCP-1 may serve for non-invasive detection of hypoxic renal injury in such patients.MethodsIntra-abdominal pressure (IAP), renal excretory function, and the biomarker levels were analyzed before, 4 and 10 day after surgery. Association between the biomarker levels and renal histology was investigated using an original model of ACS in newborn rats.ResultsFour days after surgery, IAP increased, renal excretory function decreased, and the levels of VEGF, π-GST, and MCP-1 increased, indicating renal injury. Ten days after surgery, IAP partially decreased, renal excretory function completely restored, but the biomarker levels remained elevated, suggesting the ongoing kidney injury. In the model of ACS, increase in the biomarker levels was associated with progressing kidney morphological alteration.ConclusionSurgical treatment for gastroschisis and CDH is associated with prolonged hypoxic kidney injury despite complete restoration of renal excretory function. Follow-up measurement of VEGF, π-GST, and MCP-1 levels may provide a better tool for non-invasive assessment of renal parenchyma in newborns with ACS.Pediatric Research accepted article preview online, 20 October 2017. doi:10.1038/pr.2017.263.

Concepts: Kidney, Surgery, Urinary system, Ureter, Hernia, Renal cortex, Congenital disorders, Congenital diaphragmatic hernia

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This study aimed to investigate the effect of nutrition and growth during the first 4 weeks after birth on cerebral volumes and white matter maturation at term equivalent age(TEA) and on neurodevelopmental outcome at 2 years corrected age(CA), in preterm infants.

Concepts: Childbirth

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At birth, some organs in premature infants are not developed enough to meet challenges of the extra-uterine life. Although growth and maturation continues after premature birth, postnatal organ development may become sluggish or even arrested, leading to organ dysfunction. There is no clear mechanistic concept of this postnatal organ developmental failure in premature neonates. This review introduces a concept-forming hypothesis: Mitochondrial bioenergetic dysfunction is a fundamental mechanism of organs maturation failure in premature infants. Data collected in support of this hypothesis are relevant to two major diseases of prematurity: white matter injury and broncho-pulmonary dysplasia. In these diseases, totally different clinical manifestations are defined by the same biological process, developmental failure of the main functional units-alveoli in the lungs and axonal myelination in the brain. Although molecular pathways regulating alveolar and white matter maturation differ, proper bioenergetic support of growth and maturation remains critical biological requirement for any actively developing organ. Literature analysis suggests that successful postnatal pulmonary and white matter development highly depends on mitochondrial function which can be inhibited by sublethal postnatal stress. In premature infants, sublethal stress results mostly in organ maturation failure without excessive cellular demise.Pediatric Research (2016); doi:10.1038/pr.2016.216.

Concepts: Childbirth, Biology, Mitochondrion, Heart, Myelin, Mechanism, Organs, Functionalism

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The impact of secondhand marijuana smoke exposure on children is unknown. New methods allow detection of secondhand marijuana smoke in children.

Concepts: Detection theory, Smoke

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Fewer children than adults have been affected by the COVID-19 pandemic, and the clinical manifestations are distinct from those of adults. Some children particularly those with acute or chronic comorbidities are likely to develop critical illness. Recently, a Multisystem Inflammatory Syndrome (MIS-C) has been described in children with these patients often requiring care in the Pediatric ICU. An international collaboration was formed to review the available evidence and develop evidence-based guidelines for the care of critically ill children with SARS-CoV-2 infection. Where the evidence was lacking, those gaps were replaced with consensus-based guidelines. This process has generated 44 recommendations related to pediatric COVID-19 patients presenting with respiratory distress or failure, sepsis or septic shock, cardiopulmonary arrest, MIS-C, or those requiring adjuvant therapies, or ECMO. Evidence to explain the milder disease patterns in children and the potential to use repurposed antiviral drugs, anti-inflammatory or antithrombotic therapies are also described. Brief summaries of pediatric SARS-CoV-2 infection in different regions of the world are included since few registries are capturing these data globally. These guidelines seek to harmonize the standards and strategies for intensive care that critically ill children with COVID-19 receive across the world. IMPACT: At the time of publication, this is the latest evidence for managing critically ill children infected with SARS-CoV-2.Referring to these guidelines can decrease the morbidity and potentially the mortality of children effected by COVID-19 and its sequalae.These guidelines can be adapted to both high- and limited-resource settings.