Fetal lung maturity

As presently conceptualised, the artificial placenta (AP) is an experimental life support platform for extremely preterm infants (i.e. 400-600 g; 21-23+6 weeks of gestation) born at the border of viability. It is based around the oxygenation of the periviable fetus using gas-exchangers connected to the fetal vasculature. In this system, the lung remains fluid-filled and the fetus remains in a quiescent state. The AP has been in development for some sixty years. Over this time, animal experimental models have evolved iteratively from employing external pump-driven systems used to support comparatively mature fetuses (generally goats or sheep) to platforms driven by the fetal heart and used successfully to maintain extremely premature fetuses weighing around 600 g...

Background : Antenatal steroid therapy is standard of care for women at imminent risk of preterm delivery. Current dosing regimens employ supra-pharmacological doses to achieve extended fetal steroid exposures. Objective : We aimed to determine the lowest fetal plasma betamethasone concentration sufficient to achieve functional preterm lung maturation. Study design : Ewes with singles fetuses underwent surgery to install a fetal jugular catheter. Adopting a step-wise design, ewes were randomised to either a saline-only group (Negative Control Group; n=9), or one of four betamethasone-treatment groups...

Alveolar type 2 (AT2) cells maintain lung health by acting as stem cells and producing pulmonary surfactant 1-3 . AT2 dysfunction underlies many lung diseases including interstitial lung disease (ILD), in which some inherited forms result from mislocalisation of surfactant protein C (SFTPC) variants 4,5 . Disease modelling and dissection of mechanisms remains challenging due to complexities in deriving and maintaining AT2 cells ex vivo. Here, we describe the development of expandable adult AT2-like organoids derived from human fetal lung which are phenotypically stable, can differentiate into AT1-like cells and are genetically manipulable...

The ductus arteriosus (DA) is a vascular shunt that allows oxygenated blood to bypass the developing lungs in utero. Fetal DA patency requires vasodilatory signaling via the prostaglandin E2 (PGE2 ) receptor EP4 . However, in humans and mice, disrupted PGE2 -EP4 signaling in utero causes unexpected patency of the DA (PDA) after birth, suggesting another role for EP4 during development. We used EP4 -knockout (KO) mice and acute versus chronic pharmacological approaches to investigate EP4 signaling in DA development and function...

BACKGROUND: The incidence of cervical neuroendocrine carcinoma (CNECC) during pregnancy is extremely rare. Insufficient awareness of gynecological tumor screening, as well as atypical and insidious initial clinical symptoms, may result in diagnostic delays and misdiagnosis. There is no standardized treatment for cervical cancer in pregnancy. Herein, we present a case of cervical neuroendocrine carcinoma diagnosed in the third trimester of pregnancy. CASE PRESENTATION: A 26-year-old female at 30 1/7 weeks of gestation presented with lower back and sacroiliac joint pain, abdominal distension, and lower limb dyskinesia...

The objective is to summarize the current use of artificial intelligence (AI) in obstetric ultrasound. PubMed, Cochrane Library, and ClinicalTrials.gov databases were searched using the following keywords "neural networks", OR "artificial intelligence", OR "machine learning", OR "deep learning", AND "obstetrics", OR "obstetrical", OR "fetus", OR "foetus", OR "fetal", OR "foetal", OR "pregnancy", or "pregnant", AND "ultrasound" from inception through May 2022. The search was limited to the English language. Studies were eligible for inclusion if they described the use of AI in obstetric ultrasound...

Chronic fetal hypoxaemia is a common pregnancy complication that increases the risk of infants experiencing respiratory complications at birth. In turn, chronic fetal hypoxaemia promotes oxidative stress, and maternal antioxidant therapy in animal models of hypoxic pregnancy has proven to be protective with regards to fetal growth and cardiovascular development. However, whether antenatal antioxidant therapy confers any benefit on lung development in complicated pregnancies has not yet been investigated. Here, we tested the hypothesis that maternal antenatal treatment with MitoQ will protect the developing lung in hypoxic pregnancy in sheep, a species with similar fetal lung developmental milestones as humans...

BACKGROUND: Antenatal corticosteroids have been used for the prevention of respiratory complications, intraventricular hemorrhage, necrotizing enterocolitis, and other adverse neonatal outcomes for over 50 years, with limited evidence about their optimal doses. Higher steroid doses or frequencies of antenatal corticosteroids in preterm newborns pose adverse effects such as prolonged adrenal suppression, negative effects on fetal programming and metabolism, and increased risks of neurodevelopmental and neuropsychological impairments...

The inability to support the growth and development of a mature fetus up to delivery results in significant human suffering. Current available solutions include adoption, surrogacy, and uterus transplantation. However, these options are subject to several ethical, religious, economic, social, and medical concerns. Ectogenesis is the process in which an embryo develops in an artificial uterus from implantation through to the delivery of a live infant. This current narrative review summarizes the state of recent research focused on human ectogenesis...

The objective of this study was to evaluate the effect of maturing fetal lung on clinical efficacy of acetaminophen in the treatment of premature infants with patent ductus arteriosus (PDA). A total of 441 premature infants admitted to our hospital from May 2020 to May 2021 were recruited, including 152 premature infants receiving fetal lung maturation (13 cases of PDA closure with drug use and 2 cases failed) and 289 cases without maturing fetal lung (17 cases of PDA closure and 8 cases failed). Finally, a total of 30 cases were enrolled in this clinical trial...

BACKGROUND: Cerebrovascular disease is one of the leading causes of death worldwide. Middle cerebral artery (MCA) is the largest and most complex of cerebral arteries. The prenatal period is a critical time for development, which largely determines lifelong health. Clinically, glucocorticoids (GCs) administration to accelerate preterm fetal lung maturation has become standard practice. Prenatal GCs administration increases cardiovascular risks in offspring, but little is known regarding the side effects on offspring MCA function...

Despite widespread use, dosing regimens for antenatal corticosteroid (ACS) therapy are poorly unoptimized. ACS therapy exerts a programming effect on fetal development, which may be associated with an increased risk of cardiovascular disease. Having demonstrated that low-dose steroid therapy is an efficacious means of maturing the preterm lung, we hypothesized that a low-dose steroid exposure would exert fewer adverse functional and transcriptional changes on the fetal heart. We tested this hypothesis using low-dose steroid therapy (10 mg delivered to the ewe over 36 h via constant infusion) and compared cardiac effects with those of a higher dose treatment (30 mg delivered to the ewe over 24 h by intramuscular injection; simulating currently employed clinical ACS regimens)...

Pituitary apoplexy is a rare condition that occurs due to acute haemorrhage in the pituitary gland and usually presents with features of acute hypopituitarism, visual defects and ophthalmoplegia. Pregnancy is one of the risk factors for pituitary apoplexy. Medical management is the first line of management in pregnancy irrespective of the gestational age. However, acute neuro-ophthalmological deterioration might warrant an urgent surgical decompression. Preoperative corticosteroids have dual benefits of providing hormonal replacement in the mother and also promoting fetal lung maturity in the offspring...

BACKGROUND Agnathia-otocephaly complex (AOC) is a rare congenital malformation due to a first-branch arch disorder and has been considered lethal. However, milder variants of the isolated type of AOC have been reported as nonlethal. The ex-utero intrapartum treatment (EXIT) procedure is basically indicated for a fetus with a high risk of airway obstruction immediately after birth; it is not indicated for all AOC cases but is chosen to treat cases until the airway can be evaluated to achieve a better prognosis...

INTRODUCTION: Lysophosphatidylcholine acyltransferase 1 (LPCAT1) is important for saturated phosphatidylcholine (Sat-PC) production in the lung. Sat-PC is a critical component of pulmonary surfactant, which maintains low alveolar surface tension, facilitating respiration. Previous studies have reported an association between maternal and fetal LPCAT1 levels and neonatal lung function. Using a sheep model of pregnancy, we investigated a potential correlation between glucocorticoid-induced lung maturation and LPCAT1 mRNA and/or protein levels in the fetal lung, the placenta, the fetal plasma, and the maternal plasma...

Antenatal glucocorticoids accelerate fetal lung maturation and reduce mortality in preterm babies but can trigger adverse effects on the cardiovascular system. The mechanisms underlying off-target effects of the synthetic glucocorticoids mostly used, Dexamethasone (Dex) and Betamethasone (Beta), are unknown. We investigated effects of Dex and Beta on cardiovascular structure and function, and underlying molecular mechanism using the chicken embryo, an established model system to isolate effects of therapy on the developing heart and vasculature, independent of effects on the mother or placenta...

Being born before 37 weeks' gestation, or preterm birth, is a leading cause of early childhood death and life-long disability. Antenatal steroids (ANS) are recommended for women judged at risk of imminent preterm delivery. The primary intent of ANS treatment is to rapidly mature the fetal lungs to reduce the risk of mortality and lasting morbidity. Despite being used clinically for some 50 years, a large number of uncertainties remain surrounding the use of ANS. In particular, the choice of agent, dose/regimen, and appropriate gestational age range for ANS therapy all remain unclear...

BACKGROUND: Preterm birth is the leading cause of neonatal deaths and the second leading cause of death in children under five after pneumonia. The study aimed at improving the management of preterm birth through the development of protocols for standardization of care. METHODS: The study was conducted in Mulago National Referral Labor ward in two phases. A total of 360 case files were reviewed and mothers whose files had missing data interviewed for clarity for both the baseline audit and the re-audit...

OBJECTIVES: The present study aimed to evaluate the performance of QuantusFLM® software, which performs quantitative ultrasound analysis of fetal lung texture, in predicting lung maturity in fetuses of diabetic mothers. METHODS: The patients included in this study were between 34 and 38 weeks and 6 days gestation and were divided into two groups: (1) patients with diabetes on medication and (2) control. The ultrasound images were performed up to 48 h prior to delivery and analyzed using QuantusFLM® software, which classified each fetus as high or low risk for neonatal respiratory morbidity based on lung maturity or immaturity...

This study is an analysis of fetal lung stiffness by virtual touch tissue quantification (VTTQ) elastography to predict fetal lung maturation. Evaluation of fetal lungs was first performed in B mode, and fetal lungs were analyzed at 3 different periods at third trimester in each pregnant woman, at 28 to 31, 32 to 36, and 37 to 41 weeks. Fetal lung elastography was performed at regions with the least acoustic shadow and far from ribs and heart. Each fetal lung assessment were done by taking mean lung stiffness obtained by measuring stiffness of both left and right fetal lungs...