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Fetal lung maturation

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https://www.readbyqxmd.com/read/28627012/effect-of-betamethasone-on-fetal-pulmonary-and-umbilical-artery-doppler-velocimetry-and-relationship-with-respiratory-distress-syndrome-development
#1
Emre Sinan Güngör, Gülşah İlhan, Hüseyin Gültekin, Ali Galip Zebitay, Serdar Cömert, Fatma Ferda Verit
OBJECTIVES: Respiratory distress syndrome (RDS) is a major cause of neonatal morbidity and mortality. It is primarily a disease of premature neonates. The aim of this study was to evaluate the impact of maternal betamethasone administration on the fetal pulmonary arteries (PAs) and umbilical arteries (UAs) and the correlation between RDS development and PA Doppler results. METHODS: Forty singleton pregnancies between 24 and 34 gestational weeks with a diagnosis of preterm birth were included prospectively...
June 19, 2017: Journal of Ultrasound in Medicine: Official Journal of the American Institute of Ultrasound in Medicine
https://www.readbyqxmd.com/read/28538237/update-on-postnatal-steroids
#2
Henry L Halliday
Antenatal steroid treatment to enhance fetal lung maturity and surfactant treatment to prevent or treat respiratory distress syndrome have been major advances in perinatal medicine in the past 40 years contributing to improved outcomes for preterm infants. Use of postnatal steroids to prevent or treat chronic lung disease in preterm infants has been less successful and associated with adverse neurodevelopmental outcomes. Although early (in the first week of life) postnatal steroid treatment facilitates earlier extubation and reduces the risk of chronic lung disease, it is associated with adverse effects, such as hyperglycemia, hypertension, gastrointestinal bleeding and perforation, hypertrophic cardiomyopathy, growth failure, and cerebral palsy, and cannot be recommended...
2017: Neonatology
https://www.readbyqxmd.com/read/28532833/estimation-of-fetal-lung-development-using-quantitative-analysis-of-ultrasonographic-images-in-normal-canine-pregnancy
#3
T Banzato, G Zovi, C Milani
We investigated the quantitative analysis of sonographic images to predict fetal lung maturity of the canine foetus in normal pregnancy. Twelve bitches were recruited in the present study. Serial ultrasonographic exams were performed at three pre-determined time periods corresponding to the pseudoglandular (40-48 days of pregnancy), canalicular (49-56 days of pregnancy) and saccular phase (57-63 days of pregnancy) of lung development. Mean grey level (MGL) and the standard deviation of the histogram (SDH) of fetal lung and liver sonographic images were measured with dedicated software...
July 1, 2017: Theriogenology
https://www.readbyqxmd.com/read/28527483/single-fetal-death-in-monochorionic-twin-pregnancy-co-twin-prognosis-and-neonatal-outcome
#4
Emídio Vale-Fernandes, Joana Dias, Belandina Gil, Alexandra Cadilhe
The incidence of single fetal death in twin pregnancy varies from 0.5% - 6.8%, leaving the surviving fetus with increased morbi-mortality. The prognosis is worse in monochorionic pregnancies. In addressing these cases it should be noted referral to tertiary center with differentiated perinatal support, induction of fetal lung maturation and termination of pregnancy if there's loss of fetal well-being or possibility of maternal complications and suspected neurological sequelae in the surviving fetus. The risk of iatrogenic prematurity should always be weighed with the possible consequences arising from the fetus staying in a hostile uterine environment...
February 27, 2017: Acta Médica Portuguesa
https://www.readbyqxmd.com/read/28500076/stat5-is-required-for-cd103-dendritic-cell-and-alveolar-macrophage-development-and-protection-from-lung-injury
#5
William E Eddy, Ke-Qin Gong, Bryan Bell, William C Parks, Steven F Ziegler, Anne M Manicone
We tested the role of Stat5 in dendritic cell and alveolar macrophage (AM) homeostasis in the lung using CD11c-cre mediated deletion (Cre(+)5(f/f)). We show that Stat5 is required for CD103(+) dendritic cell and AM development. We found that fetal monocyte maturation into AMs was impaired in Cre(+)5(f/f) mice, and we also confirmed impaired AM development of progenitor cells using mixed chimera experiments. In the absence of Stat5 signaling in AMs, mice developed alveolar proteinosis with altered lipid homeostasis...
June 15, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/28486361/universal-cervical-length-screening-and-antenatal-corticosteroid-timing
#6
Nicole Sahasrabudhe, Catherine Igel, Ghislaine C Echevarria, Peʼer Dar, Diana Wolfe, Peter S Bernstein, Robert Angert, Ashlesha Dayal, Patience Gallagher, Mara Rosner
OBJECTIVE: To evaluate the relationship between universal transvaginal screening for short cervical length in the second trimester and the timing of antenatal corticosteroids. METHODS: We performed a retrospective cohort study of patients with nonanomalous singleton gestations and spontaneous preterm birth between 24 and 34 weeks of gestation after the initiation of a universal transvaginal cervical length screening program between October 2012 and August 2015. Our primary outcome was antenatal corticosteroid administration to a delivery interval of fewer than 7 days...
June 2017: Obstetrics and Gynecology
https://www.readbyqxmd.com/read/28463226/prospective-isolation-of-nkx2-1-expressing-human-lung-progenitors-derived-from-pluripotent-stem-cells
#7
Finn Hawkins, Philipp Kramer, Anjali Jacob, Ian Driver, Dylan C Thomas, Katherine B McCauley, Nicholas Skvir, Ana M Crane, Anita A Kurmann, Anthony N Hollenberg, Sinead Nguyen, Brandon G Wong, Ahmad S Khalil, Sarah Xl Huang, Susan Guttentag, Jason R Rock, John M Shannon, Brian R Davis, Darrell N Kotton
It has been postulated that during human fetal development, all cells of the lung epithelium derive from embryonic, endodermal, NK2 homeobox 1-expressing (NKX2-1+) precursor cells. However, this hypothesis has not been formally tested owing to an inability to purify or track these progenitors for detailed characterization. Here we have engineered and developmentally differentiated NKX2-1GFP reporter pluripotent stem cells (PSCs) in vitro to generate and isolate human primordial lung progenitors that express NKX2-1 but are initially devoid of differentiated lung lineage markers...
June 1, 2017: Journal of Clinical Investigation
https://www.readbyqxmd.com/read/28454696/effect-of-glucocorticoids-on-mechanisms-of-placental-angiogenesis
#8
Aslı Ozmen, Gozde Unek, Emin Turkay Korgun
The benefits of antenatal glucocorticoid (GC) treatment to promote human fetal lung maturation are well established. However, reports have emerged indicating that maternal exposure to high concentrations of circulating GCs alters placental and fetal development. Because many adult-onset metabolic and cardiovascular disorders have their origins in utero, the importance of prenatal conditions should be considered in detail. Therefore, this review aims to present an overview of the GC effect on placental and fetal development, specifically with regard to mechanisms of placental angiogenesis...
April 2017: Placenta
https://www.readbyqxmd.com/read/28440792/an-extra-uterine-system-to-physiologically-support-the-extreme-premature-lamb
#9
Emily A Partridge, Marcus G Davey, Matthew A Hornick, Patrick E McGovern, Ali Y Mejaddam, Jesse D Vrecenak, Carmen Mesas-Burgos, Aliza Olive, Robert C Caskey, Theodore R Weiland, Jiancheng Han, Alexander J Schupper, James T Connelly, Kevin C Dysart, Jack Rychik, Holly L Hedrick, William H Peranteau, Alan W Flake
In the developed world, extreme prematurity is the leading cause of neonatal mortality and morbidity due to a combination of organ immaturity and iatrogenic injury. Until now, efforts to extend gestation using extracorporeal systems have achieved limited success. Here we report the development of a system that incorporates a pumpless oxygenator circuit connected to the fetus of a lamb via an umbilical cord interface that is maintained within a closed 'amniotic fluid' circuit that closely reproduces the environment of the womb...
April 25, 2017: Nature Communications
https://www.readbyqxmd.com/read/28388600/influence-of-antenatal-glucocorticoid-on-preterm-lamb-diaphragm
#10
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/28358292/pulmonary-exposure-to-metallic-nanomaterials-during-pregnancy-irreversibly-impairs-lung-development-of-the-offspring
#11
Emmanuel Paul, Marie-Laure Franco-Montoya, Erwan Paineau, Bernard Angeletti, Shamila Vibhushan, Audrey Ridoux, Arnaud Tiendrebeogo, Murielle Salome, Bernhard Hesse, Delphine Vantelon, Jérôme Rose, Florence Canouï-Poitrine, Jorge Boczkowski, Sophie Lanone, Christophe Delacourt, Jean-Claude Pairon
Due to the growing commercial applications of manufactured nanoparticles (NPs), toxicological studies on NPs, especially during the critical window of development, are of major importance. The aim of the study was to assess the impact of respiratory exposure to metallic and metal oxide NPs during pregnancy on lung development of the offspring and to determine the key parameters involved in lung alterations. Pregnant mice were exposed to weekly doses of 100 μg (total dose 300 μg) of titanium dioxide (TiO2), cerium oxide (CeO2), silver (Ag) NPs or saline solution by nonsurgical intratracheal instillation...
April 17, 2017: Nanotoxicology
https://www.readbyqxmd.com/read/28342715/prediction-of-neonatal-respiratory-morbidity-by-quantitative-ultrasound-lung-texture-analysis-a-multicenter-study
#12
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 restricts the use of fetal lung maturity assessment. OBJECTIVE: The objective of the study was to evaluate the performance of quantitative ultrasound texture analysis of the fetal lung (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
#13
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...
May 2017: European Journal of Obstetrics, Gynecology, and Reproductive Biology
https://www.readbyqxmd.com/read/28326570/reproductive-disorders-in-female-rats-after-prenatal-exposure-to-betamethasone
#14
Cibele S Borges, Tainá L Pacheco, Marina T Guerra, Aline L Barros, Patricia V Silva, Gabriela Missassi, Katiussia Pinho da Silva, Janete A Anselmo-Franci, André S Pupo, Wilma De G Kempinas
Betamethasone is the drug of choice for antenatal treatment, promoting fetal lung maturation and decreasing mortality. Previous studies in rats reported male programming and alteration in sperm parameters and sexual behavior following intrauterine betamethasone exposure. The impact on the female reproductive development is not known. In this study, rat female offspring was assessed for sexual development, morphophysiology of the reproductive tract and fertility after maternal exposure to 0.1 mg kg(-1) of betamethasone or vehicle on gestational days 12, 13, 18 and 19...
March 21, 2017: Journal of Applied Toxicology: JAT
https://www.readbyqxmd.com/read/28321847/antenatal-corticosteroids-for-accelerating-fetal-lung-maturation-for-women-at-risk-of-preterm-birth
#15
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/28318025/maternal-chronic-hypoxia-increases-expression-of-genes-regulating-lung-liquid-movement-and-surfactant-maturation-in-male-fetuses-in-late-gestation
#16
Erin V McGillick, Sandra Orgeig, Beth J Allison, Kirsty L Brain, Youguo Niu, Nozomi Itani, Katie L Skeffington, Andrew D Kane, Emilio A Herrera, Dino A Giussani, Janna L Morrison
Chronic fetal hypoxaemia is a common pregnancy complication that may arise from maternal, placental and/or fetal factors. Respiratory outcome of the infant at birth likely depends on the duration, timing and severity of the hypoxaemic insult. We have isolated the effect of maternal chronic hypoxia (MCH) for a month in late gestation on fetal lung development. Pregnant ewes were exposed to normoxia (21% O2 ) or hypoxia (10% O2 ) from 105-138 d gestation (term ∼145 d). At 138 d, gene expression in fetal lung tissue was determined by qRT-PCR...
March 20, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/28289707/eomesodermin-and-t-bet-mark-developmentally-distinct-human-natural-killer-cells
#17
Amélie Collins, Nyanza Rothman, Kang Liu, Steven L Reiner
Immaturity of the immune system of human fetuses and neonates is often invoked to explain their increased susceptibility to infection; however, the development of the fetal innate immune system in early life remains incompletely explored. We now show that the most mature NK cells found in adult (or postnatal) human circulation (CD94(-)CD16(+)) are absent during ontogeny. Human fetal NK cells were found to express the 2 signature T-box transcription factors essential for the development of all murine NK and NK-like cells, eomesodermin (Eomes) and T-bet...
March 9, 2017: JCI Insight
https://www.readbyqxmd.com/read/28225423/committee-opinion-no-688-management-of-suboptimally-dated-pregnancies
#18
(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
#19
(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/28188034/follistatin-like-1-expression-is-decreased-in-the-alveolar-epithelium-of-hypoplastic-rat-lungs-with-nitrofen-induced-congenital-diaphragmatic-hernia
#20
Toshiaki Takahashi, Julia Zimmer, Florian Friedmacher, Prem Puri
BACKGROUND/PURPOSE: Pulmonary hypoplasia (PH), characterized by incomplete alveolar development, remains a major therapeutic challenge associated with congenital diaphragmatic hernia (CDH). Follistatin-like 1 (Fstl1) is a crucial regulator of alveolar formation and maturation, which is strongly expressed in distal airway epithelium. Fstl1-deficient mice exhibit reduced airspaces, impaired alveolar epithelial cell differentiation, and insufficient production of surfactant proteins similar to PH in human CDH...
May 2017: Journal of Pediatric Surgery
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