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https://www.readbyqxmd.com/read/29127374/prediction-of-human-prenatal-exposure-to-bisphenol-a-and-bisphenol-a-glucuronide-from-an-ovine-semi-physiological-toxicokinetic-model
#1
Glenn Gauderat, Nicole Picard-Hagen, Pierre-Louis Toutain, Rémi Servien, Catherine Viguié, Sylvie Puel, Marlène Z Lacroix, Tanguy Corbel, Alain Bousquet-Melou, Véronique Gayrard
Bisphenol A (BPA) risk assessment is hampered by the difficulty of determining the extent of internal exposure in the human fetus and uncertainties regarding BPA toxicokinetics (TK) in the maternal-fetal unit. A feto-maternal TK model describing BPA and BPA glucuronide (BPAG) disposition in sheep was humanized, using human TK data obtained after d6-BPA administration on a cookie, to predict BPA and BPAG kinetics in the human mother-fetus unit. Validation of the model predictions included the assessed dose proportionality of BPA and BPAG disposition and the similarity between the simulated and measured time courses of BPA and BPAG in fetal rhesus monkeys after BPA maternal dosing...
November 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29122364/photocatalytic-degradation-of-4-amino-6-chlorobenzene-1-3-disulfonamide-stable-hydrolysis-product-of-hydrochlorothiazide-detection-of-intermediates-and-their-toxicity
#2
Sanja J Armaković, Stevan Armaković, Dragana D Četojević-Simin, Filip Šibul, Biljana F Abramović
In this work we have investigated in details the process of degradation of the 4-amino-6-chlorobenzene-1,3-disulfonamide (ABSA), stable hydrolysis product of frequently used pharmaceutical hydrochlorothiazide (HCTZ), as one of the most ubiquitous contaminants in the sewage water. The study encompassed investigation of degradation by hydrolysis, photolysis, and photocatalysis employing commercially available TiO2 Degussa P25 catalyst. The process of direct photolysis and photocatalytic degradation were investigated under different type of lights...
November 6, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/29121458/placental-drug-transport-on-a-chip-a-microengineered-in-vitro-model-of-transporter-mediated-drug-efflux-in-the-human-placental-barrier
#3
Cassidy Blundell, Yoon-Suk Yi, Lin Ma, Emily R Tess, Megan J Farrell, Andrei Georgescu, Lauren M Aleksunes, Dongeun Huh
The current lack of knowledge about the effect of maternally administered drugs on the developing fetus is a major public health concern worldwide. The first critical step toward predicting the safety of medications in pregnancy is to screen drug compounds for their ability to cross the placenta. However, this type of preclinical study has been hampered by the limited capacity of existing in vitro and ex vivo models to mimic physiological drug transport across the maternal-fetal interface in the human placenta...
November 9, 2017: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/29106824/inferring-relevant-cell-types-for-complex-traits-by-using-single-cell-gene-expression
#4
Diego Calderon, Anand Bhaskar, David A Knowles, David Golan, Towfique Raj, Audrey Q Fu, Jonathan K Pritchard
Previous studies have prioritized trait-relevant cell types by looking for an enrichment of genome-wide association study (GWAS) signal within functional regions. However, these studies are limited in cell resolution by the lack of functional annotations from difficult-to-characterize or rare cell populations. Measurement of single-cell gene expression has become a popular method for characterizing novel cell types, and yet limited work has linked single-cell RNA sequencing (RNA-seq) to phenotypes of interest...
October 23, 2017: American Journal of Human Genetics
https://www.readbyqxmd.com/read/29104751/conformation-dynamics-of-the-intrinsically-disordered-protein-c-myb-with-the-ff99idps-force-field
#5
Xiang Guo, Jincheng Han, Ray Luo, Hai-Feng Chen
The intrinsically disordered protein c-Myb plays a critical role in cellular proliferation and differentiation. Loss of c-myb function results in embryonic lethality due to failure of fetal hepatic hematopoiesis. The conformation dynamics of the intrinsically disordered c-Myb are still unknown. Here, molecular dynamics (MD) simulations with the intrinsically disordered protein force field ff99IDPs were used to study the conformation dynamics. In comparison with ff99SBildn, ff99IDPs can reproduce more diverse disordered conformers of c-Myb...
2017: RSC Advances
https://www.readbyqxmd.com/read/29100065/toward-noninvasive-monitoring-of-ongoing-electrical-activity-of-human-uterus-and-fetal-heart-and-brain
#6
S Lew, M S Hämäläinen, Y Okada
OBJECTIVE: To evaluate whether a full-coverage fetal-maternal scanner can noninvasively monitor ongoing electrophysiological activity of maternal and fetal organs. METHODS: A simulation study was carried out for a scanner with an array of magnetic field sensors placed all around the torso from the chest to the hip within a horizontal magnetic shielding enclosure. The magnetic fields from internal organs and an external noise source were computed for a pregnant woman with a 35-week old fetus...
September 19, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/29095434/a-new-molecular-mechanism-underlying-the-egcg-mediated-autophagic-modulation-of-afp-in-hepg2-cells
#7
Lin Zhao, Shengtang Liu, Jiaying Xu, Wei Li, Guangxin Duan, Haichao Wang, Huilin Yang, Zaixing Yang, Ruhong Zhou
Epigallocatechingallate (EGCG) is a major bioactive component of green tea and is associated with health benefits against multiple diseases including cancer. As an indicator of hepatocellular carcinoma (HCC), high levels of α-fetal protein (AFP) are related to malignant differentiation and poor prognosis of cancer cells. In this study, EGCG can effectively reduce AFP secretion and simultaneously induce AFP aggregation in human HCC HepG2 cells. EGCG-stimulated autophagy induces the degradation of AFP aggregates in HepG2 cells...
November 2, 2017: Cell Death & Disease
https://www.readbyqxmd.com/read/29060333/detecting-fetal-heart-sounds-by-means-of-fractal-dimension-analysis-in-the-wavelet-domain
#8
E Koutsiana, L J Hadjileontiadis, I Chouvarda, A H Khandoker
Phonocardiography is a low-cost technique for the detection of fetal heart sounds (FHS) that can extend clinical auscultation in mobile and home care setups. The work presented here examines the transferability of a Wavelet Transform (WT)-based method that combines also Fractal Dimension (FD) analysis, previously proposed as WT-FD for the cases of lung and bowel sound analysis [4], to the extraction of FHSs. The WT-FD method has been evaluated with 12 simulated FHS signals and has shown promising results in terms of accuracy and performance (89%) in identifying the location of heartbeat, even in cases of signals with additive noise up to (6dB)...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/29060149/estimates-of-peak-electric-fields-induced-by-transcranial-magnetic-stimulation-in-pregnant-women-as-patients-using-an-fem-full-body-model
#9
J Yanamadala, G M Noetscher, S N Makarov, A Pascual-Leone
Transcranial magnetic stimulation (TMS) for treatment of depression during pregnancy is an appealing alternative to fetus-threatening drugs. However, no studies to date have been performed that evaluate the safety of TMS for a pregnant mother patient and her fetus. A full-body FEM model of a pregnant woman with about 100 tissue parts has been developed specifically for the present study. This model allows accurate computations of induced electric field in every tissue given different locations of a shape-eight coil, a biphasic pulse, common TMS pulse durations, and using different values of the TMS intensity measured in SMT (Standard Motor Threshold) units...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/29049070/noninfectious-fever-in-the-near-term-pregnant-rat-induces-fetal-brain-inflammation-a-model-for-the-consequences-of-epidural-associated-maternal-fever
#10
Scott Segal, Carlo Pancaro, Iwona Bonney, James E Marchand
BACKGROUND: Women laboring with epidural analgesia experience fever much more frequently than do women who chose other forms of analgesia, and maternal intrapartum fever is associated with numerous adverse consequences, including brain injury in the fetus. We developed a model of noninfectious inflammatory fever in the near-term pregnant rat to simulate the pathophysiology of epidural-associated fever and hypothesized that it would produce fetal brain inflammation. METHODS: Twenty-four pregnant Sprague-Dawley rats were studied at 20 days gestation (term: 22 days)...
October 17, 2017: Anesthesia and Analgesia
https://www.readbyqxmd.com/read/28974857/a-phantom-study-on-fetal-dose-reducing-factors-in-pregnant-patients-with-breast-cancer-during-radiotherapy-treatment
#11
Akın Öğretici, Aydın Çakır, Uğur Akbaş, Canan Köksal, Ümmühan Kalafat, Makbule Tambaş, Hatice Bilge
PURPOSE: This study aims to investigate the factors that reduce fetal dose in pregnant patients with breast cancer throughout their radiation treatment. Two main factors in a standard radiation oncology center are considered as the treatment planning systems (TPSs) and simple shielding for intensity modulated radiation therapy technique. MATERIALS AND METHODS: TPS factor was evaluated with two different planning algorithms: Anisotropic analytical algorithm and Acuros XB (external beam)...
July 2017: Journal of Medical Physics
https://www.readbyqxmd.com/read/28962699/quantitative-prediction-of-fetal-plasma-concentration-of-fluvoxamine-during-dosage-tapering-to-the-mother
#12
Sayo Matsuoka, Satoko Hori, Hiroki Satoh, Takeshi Nagamatsu, Tomoyuki Fujii, Yasufumi Sawada
INTRODUCTION: Although selective serotonin reuptake inhibitors have been used during pregnancy for the treatment of depression and anxiety disorders, the fetal plasma concentration profiles of them remained unclear. Therefore, the aim of this study was to develop a pharmacokinetic model to estimate fetal plasma concentration profiles of fluvoxamine, and to clarify the differences with those of paroxetine. METHODS: Perfusion studies using human placentae obtained from full-term pregnant women were conducted to estimate transplacental pharmacokinetic parameters for fluvoxamine...
October 2017: Placenta
https://www.readbyqxmd.com/read/28962695/arterio-venous-fetoplacental-vascular-geometry-and-hemodynamics-in-the-mouse-placenta
#13
Monique Y Rennie, Lindsay S Cahill, S Lee Adamson, John G Sled
INTRODUCTION: The fetoplacental vasculature network is essential for the exchange of nutrients, gases and wastes with the maternal circulation and for normal fetal development. The present study quantitatively compares arterial and venous morphological and functional differences in the mouse fetoplacental vascular network. METHODS: High resolution X-ray micro-computed tomography was used to visualize the 3D geometry of the arterial and venous fetoplacental vasculature in embryonic day 15...
October 2017: Placenta
https://www.readbyqxmd.com/read/28959508/autonomic-dysreflexia-in-the-peripartum-patient-a-multidisciplinary-and-interprofessional-simulation-scenario
#14
Purnima M Rao, Adam Garber, Chandrew Rajakumar, Genevieve Rousseau, George Dumitrascu, Glenn D Posner
This case is one of an eight-case multidisciplinary curriculum designed and implemented at the University of Ottawa by simulation educators with specialty training in obstetrics and gynecology (ob/gyn) and anesthesiology. Consultation with a nurse educator maintained quality and relevance of objectives for nursing participants. The curriculum was prepared to train ob/gyn and anesthesiology residents and nurses to hone crisis resource management skills and to recognize and manage rare/critical medical events in an obstetrical setting...
July 25, 2017: Curēus
https://www.readbyqxmd.com/read/28954567/optimal-timing-of-delivery-for-women-with-breast-cancer-according-to-cancer-stage-and-hormone-status-a-decision-analytic-model
#15
Kelly Kuo, Aaron B Caughey
OBJECTIVE: To compare strategies for the timing of delivery in women with breast cancer and known cancer stage or hormone receptor subtype, and to determine the optimal gestational age for induction in regards to maternal-fetal outcomes. STUDY DESIGN: A decision-analytic model was designed comparing eight different strategies for scheduled delivery at 30, 31, 32, 33, 34, 35, 36, and 37 weeks gestation. Optimal breast cancer treatment was assumed to be delayed until after delivery...
September 27, 2017: Journal of Maternal-fetal & Neonatal Medicine
https://www.readbyqxmd.com/read/28948372/comparative-anatomy-on-3-d-mri-of-the-urogenital-sinus-and-the-periurethral-area-before-and-during-the-second-stage-of-labor-during-childbirth
#16
Jean-Christophe Maran, Lucie Cassagnes, Vincent Delmas, Dominique Musset, René Frydman, Gérard Mage, Michel Canis, Louis Boyer, Olivier Ami
PURPOSE OF THE STUDY: To describe the observable MRI changes in the urogenital sinus during the second stage of labor and delivery by comparing the changes in the positions of the anatomical structures of the maternal perineum using MRI-based vector 3-D models. MATERIALS AND METHODS: Seven pregnant women underwent 3-D MRI sequences using a Philips 1 T Panorama open MRI during the pre-labor period and during the second stage of labor. A 3-D vector reconstruction platform (BABYPROGRESS, France) enabled the transformation of volumes of 2-D images into finite element meshes...
September 26, 2017: Surgical and Radiologic Anatomy: SRA
https://www.readbyqxmd.com/read/28945614/simulation-training-in-obstetrics
#17
Nicole R Gavin, Andrew J Satin
Simulation now permeates all levels of training in obstetrics and maternal-fetal medicine. We will review the role of obstetric simulation through the continuum of training and practice. Simulation allows learners to acquire skills in a nonthreatening environment while avoiding harm to patients. Simulation in obstetrics evolved from a learning tool for students and residents, to a method for experienced physicians to learn new procedures and reenter the full breadth and depth of practice. Specialty boards and credentialing organizations recognize simulation training as an innovative approach to assess and assure technical, clinical, and teamwork skills...
December 2017: Clinical Obstetrics and Gynecology
https://www.readbyqxmd.com/read/28944222/fetal-heart-sounds-detection-using-wavelet-transform-and-fractal-dimension
#18
Elisavet Koutsiana, Leontios J Hadjileontiadis, Ioanna Chouvarda, Ahsan H Khandoker
Phonocardiography is a non-invasive technique for the detection of fetal heart sounds (fHSs). In this study, analysis of fetal phonocardiograph (fPCG) signals, in order to achieve fetal heartbeat segmentation, is proposed. The proposed approach (namely WT-FD) is a wavelet transform (WT)-based method that combines fractal dimension (FD) analysis in the WT domain for the extraction of fHSs from the underlying noise. Its adoption in this field stems from its successful use in the fields of lung and bowel sounds de-noising analysis...
2017: Frontiers in Bioengineering and Biotechnology
https://www.readbyqxmd.com/read/28943130/estimation-and-reduction-of-the-radiation-dose-to-the-fetus-from-external-beam-radiotherapy
#19
REVIEW
Michalis Mazonakis, John Damilakis
The appearance of a malignant disease during pregnancy is relatively rare. The use of external-beam radiation therapy is limited to non-pelvic tumors which are usually located above the diaphragm. However, supradiaphragmatic radiotherapy unavoidably exposes the fetus to secondary radiation due to head leakage, scatter from the machine and scatter produced inside the patient. This fetal exposure may be associated with an elevated risk for the development of deterministic harmful effects and/or carcinogenesis...
September 21, 2017: Physica Medica: PM
https://www.readbyqxmd.com/read/28941740/fetal-radiation-dose-in-three-common-ct-examinations-during-pregnancy-monte-carlo-study
#20
A Kelaranta, T Mäkelä, T Kaasalainen, M Kortesniemi
PURPOSE: To determine fetal doses in different stages of pregnancy in three common computed tomography (CT) examinations: pulmonary CT angiography, abdomino-pelvic and trauma scan with Monte Carlo (MC) simulations. METHODS: An adult female anthropomorphic phantom was scanned with a 64-slice CT using pulmonary angiography, abdomino-pelvic and trauma CT scan protocols. Three different sized gelatin boluses placed on the phantom's abdomen simulated different stages of pregnancy...
September 20, 2017: Physica Medica: PM
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