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lung maturity preterm

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https://www.readbyqxmd.com/read/28426693/influence-of-prenatal-hypoxia-and-postnatal-hyperoxia-on-morphologic-lung-maturation-in-mice
#1
Andreas Schmiedl, Torge Roolfs, Erol Tutdibi, Ludwig Gortner, Dominik Monz
BACKGROUND: Oxygen supply as a lifesaving intervention is frequently used to treat preterm infants suffering additionally from possible prenatal or perinatal pathogen features. The impact of oxygen and/or physical lung injury may influence the morphological lung development, leading to a chronic postnatal lung disease called bronchopulmonary dysplasia (BPD). At present different experimental BPD models are used. However, there are no systematic comparative studies regarding different influences of oxygen on morphological lung maturation...
2017: PloS One
https://www.readbyqxmd.com/read/28388600/influence-of-antenatal-glucocorticoid-on-preterm-lamb-diaphragm
#2
Tanzila Mahzabin, J Jane Pillow, Gavin J Pinniger, Anthony J Bakker, Peter B Noble, Robert B White, Kanakeswary Karisnan, Yong Song
BACKGROUND: Pregnant women at high risk of preterm delivery receive glucocorticoids to accelerate fetal lung maturation and surfactant synthesis. However, the effect of antenatal steroids on the developing diaphragm remains unclear. We hypothesized that maternal betamethasone impairs the fetal diaphragm, and the magnitude of the detrimental effect increases with longer duration of exposure. We aimed to determine how different durations of fetal exposure to maternal betamethasone treatment influence the fetal diaphragm at the functional and molecular levels...
April 7, 2017: Pediatric Research
https://www.readbyqxmd.com/read/28342715/prediction-of-neonatal-respiratory-morbidity-by-quantitative-ultrasound-lung-texture-analysis-a-multicenter-study
#3
Montse Palacio, Elisenda Bonet-Carne, Teresa Cobo, Alvaro Perez-Moreno, Joan Sabrià, Jute Richter, Marian Kacerovsky, Bo Jacobsson, Raúl A García-Posada, Fernando Bugatto, Ramon Santisteve, Àngels Vives, Mauro Parra-Cordero, Edgar Hernandez-Andrade, José Luis Bartha, Pilar Carretero-Lucena, Kai Lit Tan, Rogelio Cruz-Martínez, Minke Burke, Suseela Vavilala, Igor Iruretagoyena, Juan Luis Delgado, Mauro Schenone, Josep Vilanova, Francesc Botet, George S H Yeo, Jon Hyett, Jan Deprest, Roberto Romero, Eduard Gratacos
BACKGROUND: Prediction of neonatal respiratory morbidity may be useful to plan delivery in complicated pregnancies. The limited predictive performance of the current diagnostic tests together with the risks of an invasive procedure limits the use of fetal lung maturity assessment. OBJECTIVE: The objective of the study was to evaluate the performance of quantitative ultrasound texture analysis (quantusFLM) to predict neonatal respiratory morbidity in preterm and early-term (<39...
March 23, 2017: American Journal of Obstetrics and Gynecology
https://www.readbyqxmd.com/read/28342395/longitudinal-progression-of-fetal-short-term-variation-and-average-acceleration-and-deceleration-capacity-after-antenatal-maternal-betamethasone-application
#4
Joy Weyrich, Anna Setter, Alexander Müller, Georg Schmidt, Christine E Brambs, Javier U Ortiz, Silvia M Lobmaier
OBJECTIVE: To analyze the effect of maternal betamethasone given for fetal lung maturation on fetal short-term variation (STV) and average acceleration and deceleration capacity (AAC/ADC). Both of these factors are calculated by phase-rectified signal averaging (PRSA) and represent new parameters to assess the fetal autonomic nervous system. STUDY DESIGN: A longitudinal prospective study including 26 pregnant women at risk for preterm delivery was performed. Two injections of 12mg betamethasone were administered intramuscularly at a 24h interval for lung maturation...
March 18, 2017: European Journal of Obstetrics, Gynecology, and Reproductive Biology
https://www.readbyqxmd.com/read/28321847/antenatal-corticosteroids-for-accelerating-fetal-lung-maturation-for-women-at-risk-of-preterm-birth
#5
REVIEW
Devender Roberts, Julie Brown, Nancy Medley, Stuart R Dalziel
BACKGROUND: Respiratory morbidity including respiratory distress syndrome (RDS) is a serious complication of preterm birth and the primary cause of early neonatal mortality and disability. While researching the effects of the steroid dexamethasone on premature parturition in fetal sheep in 1969, Liggins found that there was some inflation of the lungs of lambs born at gestations at which the lungs would be expected to be airless. Liggins and Howie published the first randomised controlled trial in humans in 1972 and many others followed...
March 21, 2017: Cochrane Database of Systematic Reviews
https://www.readbyqxmd.com/read/28225423/committee-opinion-no-688-management-of-suboptimally-dated-pregnancies
#6
(no author information available yet)
The American College of Obstetricians and Gynecologists considers first-trimester ultrasonography to be the most accurate method to establish or confirm gestational age. Pregnancies without an ultrasonographic examination confirming or revising the estimated due date before 22 0/7 weeks of gestation should be considered suboptimally dated. This document provides guidance for managing pregnancies in which the best clinical estimate of gestational age is suboptimal. There is no role for elective delivery in a woman with a suboptimally dated pregnancy...
March 2017: Obstetrics and Gynecology
https://www.readbyqxmd.com/read/28225418/committee-opinion-no-688-summary-management-of-suboptimally-dated-pregnancies
#7
(no author information available yet)
The American College of Obstetricians and Gynecologists considers first-trimester ultrasonography to be the most accurate method to establish or confirm gestational age. Pregnancies without an ultrasonographic examination confirming or revising the estimated due date before 22 0/7 weeks of gestation should be considered suboptimally dated. This document provides guidance for managing pregnancies in which the best clinical estimate of gestational age is suboptimal. There is no role for elective delivery in a woman with a suboptimally dated pregnancy...
March 2017: Obstetrics and Gynecology
https://www.readbyqxmd.com/read/28170341/the-effects-of-antenatal-glucocorticoid-exposure-on-fetal-and-neonatal-skin-maturation
#8
Deanne August, Yogavijayan Kandasamy
AIMS: The use of antenatal glucocorticoids in women with preterm labor has dramatically improved outcomes for premature infants. The most commonly used antenatal glucocorticoids are betamethasone and dexamethasone. Glucocorticoids accelerate fetal lung growth by several mechanisms, including the maturation of type II pneumocytes enabling surfactant production. Furthermore, the lipids in the lung share similarity with those in the skin. Therefore, antenatal administration of glucocorticoids may have effects on the structure and function of the developing epidermal barrier in fetuses and neonates...
February 7, 2017: Journal of Perinatal Medicine
https://www.readbyqxmd.com/read/28152539/hyperoxia-and-the-immature-brain
#9
Bettina Reich, Daniela Hoeber, Ivo Bendix, Ursula Felderhoff-Mueser
Despite major advances in obstetrics and neonatal intensive care, preterm infants frequently suffer from neurological impairments in later life. Preterm and also full-term neonates are generally susceptible to injury caused by reactive oxygen species due to the immaturity of endogenous radical scavenging systems. It is well known that high oxygen levels experienced during the critical phase of maturation can profoundly influence developmental processes. Supraphysiological oxygen concentrations used for resuscitation or in the care of critically ill infants are known to have deleterious effects on the developing lung and retina, contributing to the pathophysiology of neonatal diseases like bronchopulmonary dysplasia and retinopathy of prematurity...
2016: Developmental Neuroscience
https://www.readbyqxmd.com/read/27918476/antenatal-dexamethasone-exposure-in-preterm-infants-is-associated-with-allergic-diseases-and-the-mental-development-index-in-children
#10
Wan-Ning Tseng, Chih-Cheng Chen, Hong-Ren Yu, Li-Tung Huang, Ho-Chang Kuo
Background: Antenatal steroid administration may benefit fetal lung maturity in preterm infants. Although some studies have shown that this treatment may increase asthma in childhood, the correlation between antenatal dexamethasone exposure and allergic diseases remains unclear. The purpose of this study is to investigate the association between antenatal dexamethasone and T cell expression in childhood allergic diseases. Methods: We recruited a cohort of preterm infants born at Kaohsiung Chang Gung Memorial Hospital between 2007 and 2010 with a gestational age of less than 35 weeks and body weight at birth of less than 1500 g...
December 3, 2016: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/27879381/pediatric-prolonged-mechanical-ventilation-considerations-for-definitional-criteria
#11
Michaël Sauthier, Louise Rose, Philippe Jouvet
BACKGROUND: A 2005 consensus conference led by the National Association for Medical Direction of Respiratory Care (NAMDRC) defined prolonged mechanical ventilation (PMV) for adults as invasive and/or noninvasive mechanical ventilation (NIV) for ≥ 21 consecutive days for ≥ 6 h/d. In children, no such consensus definition exists. This results in substantial variability in definitional criteria, making study of the impact and outcomes of PMV across and within settings problematic. The objective of this work was to identify how PMV for children and neonates is described in the literature and to outline pediatric/neonatal considerations related to PMV, with the goal of proposing a pediatric/neonatal adaptation to the NAMDRC definition...
January 2017: Respiratory Care
https://www.readbyqxmd.com/read/27856214/inflammation-induced-preterm-lung-maturation-lessons-from-animal-experimentation
#12
REVIEW
Timothy J M Moss, Alana J Westover
Intrauterine inflammation, or chorioamnionitis, is a major contributor to preterm birth. Prematurity per se is associated with considerable morbidity and mortality resulting from lung immaturity but exposure to chorioamnionitis reduces the risk of neonatal respiratory distress syndrome (RDS) in preterm infants. Animal experiments have identified that an increase in pulmonary surfactant production by the preterm lungs likely underlies this decreased risk of RDS in infants exposed to chorioamnionitis. Further animal experimentation has shown that infectious or inflammatory agents in amniotic fluid exert their effects on lung development by direct effects within the developing respiratory tract, and probably not by systemic pathways...
October 20, 2016: Paediatric Respiratory Reviews
https://www.readbyqxmd.com/read/27843119/potential-nutrients-for-preventing-or-treating-bronchopulmonary-dysplasia
#13
REVIEW
Liya Ma, Ping Zhou, Josef Neu, Hung-Chih Lin
Bronchopulmonary dysplasia (BPD) is a frequent complication occurring in extremely preterm infants. Despite recent advances in newborn medicine, the incidence of BPD does not appear to have changed markedly, and specific treatments and prevention strategies are still lacking. Nutrition plays an important role in normal lung development and maturation. Malnutrition may delay somatic growth and new alveoli development, thus aggravating pulmonary injury involved in the pathogenesis of BPD. However, few nutrients have been investigated for their potential to mitigate the pathogenesis of BPD...
March 2017: Paediatric Respiratory Reviews
https://www.readbyqxmd.com/read/27764015/progesterone-as-a-tocolytic-agent-for-preterm-labor-a-systematic-review
#14
Reshama Navathe, Vincenzo Berghella
PURPOSE OF REVIEW: Tocolytic agents have been used for over 60 years in the fight against preterm labor, which ultimately can lead to preterm birth. Currently, clinicians can choose from a variety of drug classes to achieve the primary goal of delaying delivery by 48 h, thereby allowing time for administration of corticosteroids for fetal lung maturity, and if appropriate, starting magnesium sulfate for fetal neuroprotection. However, there are currently no known therapies to maintain the tocolytic effect beyond those initial 48 h...
December 2016: Current Opinion in Obstetrics & Gynecology
https://www.readbyqxmd.com/read/27659865/preeclampsia-short-and-long-term-consequences-for-mother-and-neonate
#15
REVIEW
Anouk Bokslag, Mirjam van Weissenbruch, Ben Willem Mol, Christianne J M de Groot
Preeclampsia is a common pregnancy specific disease, that presents with hypertension and a variety of organ failures, including malfunction of kidneys, liver and lungs. At present, the only definitive treatment of preeclampsia is end the pregnancy and deliver the neonate and placenta. For women with mild preeclampsia in the preterm phase of pregnancy, expectant management is generally indicated to improve fetal maturity, often requiring maternal medical treatment. Last decades, more evidence is available that the underlying mechanism of preeclampsia, endothelial disease, is not limited to pregnancy but increases cardiovascular risk in later life...
November 2016: Early Human Development
https://www.readbyqxmd.com/read/27636897/antenatal-corticosteroids-and-the-renin-angiotensin-aldosterone-system-in-adolescents-born-preterm
#16
Andrew M South, Patricia A Nixon, Mark C Chappell, Debra I Diz, Gregory B Russell, Beverly M Snively, Hossam A Shaltout, James C Rose, T Michael O'Shea, Lisa K Washburn
BACKGROUND: Antenatal corticosteroid (ANCS) treatment hastens fetal lung maturity and improves survival of premature infants, but the long-term effects of ANCS are not well-described. Animal models suggest that ANCS increases the risk of cardiovascular disease through programmed changes in the renin-angiotensin (Ang)-aldosterone system (RAAS). We hypothesized that ANCS exposure alters the RAAS in adolescents born prematurely. METHODS: A cohort of 173 adolescents born prematurely was evaluated, of whom 92 were exposed to ANCS...
January 2017: Pediatric Research
https://www.readbyqxmd.com/read/27629593/fetal-to-maternal-signaling-in-the-timing-of-birth
#17
REVIEW
Carole R Mendelson, Alina P Montalbano, Lu Gao
Preterm birth remains the major cause of neonatal morbidity and mortality throughout the world. This is due, in part, to our incomplete understanding of the mechanisms that underlie the maintenance of pregnancy and the initiation of parturition at term. In this article, we review our current knowledge of the complex, interrelated and concerted mechanisms whereby progesterone maintains myometrial quiescence throughout most of pregnancy, as well as those that mediate the upregulation of the inflammatory response and decline in progesterone receptor function leading to parturition...
September 11, 2016: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/27591320/fetal-cd103-il-17-producing-group-3-innate-lymphoid-cells-represent-the-dominant-lymphocyte-subset-in-human-amniotic-fluid
#18
Nicole Marquardt, Martin A Ivarsson, Erik Sundström, Elisabet Åkesson, Elisa Martini, Liv Eidsmo, Jenny Mjösberg, Danielle Friberg, Marius Kublickas, Sverker Ek, Gunilla Tegerstedt, Åke Seiger, Magnus Westgren, Jakob Michaëlsson
Amniotic fluid (AF) surrounds the growing fetus, and cells derived from AF are commonly used for diagnosis of genetic diseases. Intra-amniotic infections are strongly linked to preterm birth, which is the leading cause of perinatal mortality worldwide. Surprisingly little is known, however, about mature hematopoietic cells in AF, which could potentially be involved in immune responses during pregnancy. In this study, we show that the dominating population of viable CD45(+) cells in AF is represented by a subset of fetal CD103(+) group 3 innate lymphoid cells (ILCs) producing high levels of IL-17 and TNF...
September 2, 2016: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/27514234/red-blood-cell-transfusion-and-clinical-outcomes-in-extremely-low-birth-weight-preterm-infants
#19
Yu-Cheng Wang, Oi-Wa Chan, Ming-Chou Chiang, Peng-Hong Yang, Shih-Ming Chu, Jen-Fu Hsu, Ren-Huei Fu, Reyin Lien
BACKGROUND: Red blood cell (RBC) transfusion is often considered a life-saving measure in critically ill neonates. The smallest and least mature infants tend to receive the largest amount of transfusions. RBC transfusion itself has also been suggested as an independent risk factor of poor clinical outcome in critical patients. Our aim is to study if there are associations between RBC transfusion and in-hospital mortality, short-term morbidities, and late neurodevelopmental outcome in extremely low birth weight (ELBW) preterm infants...
July 5, 2016: Pediatrics and Neonatology
https://www.readbyqxmd.com/read/27509264/glucocorticoid-receptor-gene-variants-and-neonatal-outcome-in-very-low-birth-weight-preterm-infants
#20
Christine Schreiner, Felix Schreiner, Christoph Härtel, Matthias Heckmann, Axel Heep, Peter Bartmann, Joachim Woelfle, Andreas Müller, Egbert Herting, Wolfgang Göpel
BACKGROUND: Induction of lung maturation by prenatal steroid treatment has become the standard of care for pregnant women at risk for preterm birth. In addition to the beneficial effects on lung maturation, prenatal steroids have been shown to reduce the incidence of neonatal death, necrotizing enterocolitis, sepsis, and intraventricular hemorrhage. However, little is known about the role of interindividual differences in corticoid sensitivity arising from polymorphisms in the glucocorticoid receptor (GR) gene...
2017: Neonatology
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