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Pregnancy simulation

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https://www.readbyqxmd.com/read/28334179/bayesian-distributed-lag-interaction-models-to-identify-perinatal-windows-of-vulnerability-in-children-s-health
#1
Ander Wilson, Yueh-Hsiu Mathilda Chiu, Hsiao-Hsien Leon Hsu, Robert O Wright, Rosalind J Wright, Brent A Coull
Epidemiological research supports an association between maternal exposure to air pollution during pregnancy and adverse children's health outcomes. Advances in exposure assessment and statistics allow for estimation of both critical windows of vulnerability and exposure effect heterogeneity. Simultaneous estimation of windows of vulnerability and effect heterogeneity can be accomplished by fitting a distributed lag model (DLM) stratified by subgroup. However, this can provide an incomplete picture of how effects vary across subgroups because it does not allow for subgroups to have the same window but different within-window effects or to have different windows but the same within-window effect...
February 27, 2017: Biostatistics
https://www.readbyqxmd.com/read/28297453/spot-scanning-proton-therapy-minimizes-neutron-dose-in-the-setting-of-radiation-therapy-administered-during-pregnancy
#2
Xin Wang, Falk Poenisch, Narayan Sahoo, Ronald X Zhu, MingFwu Lii, Michael T Gillin, Jing Li, David Grosshans
This is a real case study to minimize the neutron dose equivalent (H) to a fetus using spot scanning proton beams with favorable beam energies and angles. Minimum neutron dose exposure to the fetus was achieved with iterative planning under the guidance of neutron H measurement. Two highly conformal treatment plans, each with three spot scanning beams, were planned to treat a 25-year-old pregnant female with aggressive recurrent chordoma of the base of skull who elected not to proceed with termination. Each plan was scheduled for delivery every other day for robust target coverage...
September 2016: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28292614/embryo-transfer-simulation-improves-pregnancy-rates-and-decreases-time-to-proficiency-in-reproductive-endocrinology-and-infertility-fellow-embryo-transfers
#3
Ryan J Heitmann, Micah J Hill, John M Csokmay, Justin Pilgrim, Alan H DeCherney, Shad Deering
OBJECTIVE: To design and evaluate an ET simulator to train Reproductive Endocrinology and Infertility (REI) fellows' techniques of ET. DESIGN: Simulation model development and retrospective cohort analysis. SETTING: Not applicable. PATIENT(S): Patients undergoing IVF. INTERVENTION(S): Simulation model evaluation and implementation of ET simulation training. MAIN OUTCOME MEASURE(S): Pregnancy rates...
March 11, 2017: Fertility and Sterility
https://www.readbyqxmd.com/read/28269608/modelling-nutrient-transfer-based-on-3d-imaging-of-the-human-placental-microstructure
#4
S Perazzolo, R M Lewis, B G Sengers
Impaired transfer of nutrients from mother to fetus can affect pregnancy outcomes. The placenta has a complex microstructure, including the maternal intervillous space and fetal capillaries. Previous computational models of placental transfer either assumed a simplified idealized local geometry or were based on 2D imaging. In this study, we present a novel 3D computational model to assess the placental transfer of nutrients at the microscale in interaction with the maternal flow environment. A stack of confocal microscopy images of the placental terminal villi was collected and reconstructed...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28258413/viscosity-and-haemodynamics-in-a-late-gestation-rat-feto-placental-arterial-network
#5
Nikhilesh Bappoo, Lachlan J Kelsey, Louis Parker, Tim Crough, Carmel M Moran, Adrian Thomson, Megan C Holmes, Caitlin S Wyrwoll, Barry J Doyle
The placenta is a transient organ which develops during pregnancy to provide haemotrophic support for healthy fetal growth and development. Fundamental to its function is the healthy development of vascular trees in the feto-placental arterial network. Despite the strong association of haemodynamics with vascular remodelling mechanisms, there is a lack of computational haemodynamic data that may improve our understanding of feto-placental physiology. The aim of this work was to create a comprehensive 3D computational fluid dynamics model of a substructure of the rat feto-placental arterial network and investigate the influence of viscosity on wall shear stress (WSS)...
March 3, 2017: Biomechanics and Modeling in Mechanobiology
https://www.readbyqxmd.com/read/28250013/time-variant-genetic-effects-as-a-cause-for-preterm-birth-insights-from-a-population-of-maternal-cousins-in-sweden
#6
Julius Juodakis, Jonas Bacelis, Ge Zhang, Louis J Muglia, Bo Jacobsson
Preterm delivery is the leading cause of neonatal mortality worldwide, yet its etiology remains largely unexplained. We propose that the genetic factors controlling this trait could act in a non-uniform manner during pregnancy, with each factor having a unique 'window of sensitivity.' We test this hypothesis by modeling the distribution of gestational ages observed in maternal cousins from the Swedish Medical Birth Register (n=35,541 pairs). The models were built using a time-to-event framework, with simulated genetic factors that increase the hazard of birth either uniformly across the pregnancy (constant effect) or only in particular windows (varying effect)...
March 1, 2017: G3: Genes—Genomes—Genetics
https://www.readbyqxmd.com/read/28242669/optimal-antimalarial-dose-regimens-for-sulfadoxine-pyrimethamine-with-and-without-azithromycin-in-pregnancy-based-on-population-pharmacokinetic-modelling
#7
Sam Salman, Francisca Baiwog, Madhu Page-Sharp, Susan Griffin, Harin A Karunajeewa, Ivo Mueller, Stephen J Rogerson, Peter M Siba, Kenneth F Ilett, Timothy M E Davis
Optimal dosing of sulfadoxine-pyrimethamine (SP) as intermittent preventive treatment in pregnancy remains to be established, particularly when co-administered with azithromycin (AZI). To further characterize SP pharmacokinetics in pregnancy, plasma concentration-time data from 45 non-pregnant and 45 pregnant women treated with SP-AZI (n=15 in each group) and SP-chloroquine (n=30 in each group) were analyzed. Population non-linear mixed effects pharmacokinetic models were developed for pyrimethamine (PYR), sulfadoxine (SDOX) and N-acetylsulfadoxine (the SDOX metabolite NASDOX), and potential covariates were included...
February 27, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28227866/modelling-nutrient-transfer-based-on-3d-imaging-of-the-human-placental-microstructure
#8
S Perazzolo, R M Lewis, B G Sengers, S Perazzolo, R M Lewis, B G Sengers, B G Sengers, R M Lewis, S Perazzolo
Impaired transfer of nutrients from mother to fetus can affect pregnancy outcomes. The placenta has a complex microstructure, including the maternal intervillous space and fetal capillaries. Previous computational models of placental transfer either assumed a simplified idealized local geometry or were based on 2D imaging. In this study, we present a novel 3D computational model to assess the placental transfer of nutrients at the microscale in interaction with the maternal flow environment. A stack of confocal microscopy images of the placental terminal villi was collected and reconstructed...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28145985/left-truncation-bias-to-explain-the-protective-effect-of-smoking-on-preeclampsia-potential-but-how-plausible
#9
Alan C Kinlaw, Jessie P Buckley, Stephanie M Engel, Charles Poole, M Alan Brookhart, Alexander P Keil
BACKGROUND: An inverse association between maternal smoking and preeclampsia has been frequently observed in epidemiologic studies for several decades. In the May 2015 issue of this journal, Lisonkova and Joseph described a simulation study suggesting that bias from left truncation might explain the inverse association. The simulations were based on strong assumptions regarding the underlying mechanisms through which bias might occur. METHODS: To examine the sensitivity of the previous authors' conclusions to these assumptions, we constructed a new Monte Carlo simulation using published estimates to frame our data generating parameters...
January 31, 2017: Epidemiology
https://www.readbyqxmd.com/read/28102503/reducing-unintended-pregnancies-as-a-strategy-to-avert-zika-related-microcephaly-births-in-the-united-states-a-simulation-study
#10
Katherine A Ahrens, Jennifer A Hutcheon, Loretta Gavin, Susan Moskosky
Introduction There is increasing evidence that infection with the Zika virus (ZIKV) during pregnancy can lead to severe brain abnormalities in infants exposed in utero. The objective of our analysis was to estimate the contribution of enhanced contraception access to averting ZIKV-related microcephaly births in the United States, alone and in combination with another possible strategy, anti-ZIKV vaccination. Methods We used Monte Carlo sampling techniques (n = 100,000 simulations) to estimate the number of microcephaly births expected under strategies of enhanced contraception only, vaccination only, both enhanced contraception and vaccination, and status quo (no intervention)...
January 19, 2017: Maternal and Child Health Journal
https://www.readbyqxmd.com/read/28089487/estimation-of-national-regional-and-global-prevalence-of-alcohol-use-during-pregnancy-and-fetal-alcohol-syndrome-a-systematic-review-and-meta-analysis
#11
Svetlana Popova, Shannon Lange, Charlotte Probst, Gerrit Gmel, Jürgen Rehm
BACKGROUND: Alcohol use during pregnancy is the direct cause of fetal alcohol syndrome (FAS). We aimed to estimate the prevalence of alcohol use during pregnancy and FAS in the general population and, by linking these two indicators, estimate the number of pregnant women that consumed alcohol during pregnancy per one case of FAS. METHODS: We began by doing two independent comprehensive systematic literature searches using multiple electronic databases for original quantitative studies that reported the prevalence in the general population of the respective country of alcohol use during pregnancy published from Jan 1, 1984, to June 30, 2014, or the prevalence of FAS published from Nov 1, 1973, to June 30, 2015, in a peer-reviewed journal or scholarly report...
March 2017: Lancet Global Health
https://www.readbyqxmd.com/read/28079198/oligomerization-of-fvflm-peptides-and-their-ability-to-inhibit-beta-amyloid-peptides-aggregation-consideration-as-a-possible-model
#12
M Kouza, A Banerji, A Kolinski, I A Buhimschi, A Kloczkowski
Preeclampsia, a pregnancy-specific disorder, shares typical pathophysiological features with protein misfolding disorders including Alzheimer's disease. Characteristic for preeclampsia is the involvement of multiple proteins of which fragments of SERPINA1 and β-amyloid co-aggregate in urine and placenta of preeclamptic women. To explore the biophysical basis of this interaction, we investigated the multidimensional efficacy of the FVFLM sequence in SERPINA1, as a model inhibitory agent of β-amyloid aggregation...
January 25, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28029359/computational-modeling-of-the-structure-function-relationship-in-human-placental-terminal-villi
#13
R Plitman Mayo, J Olsthoorn, D S Charnock-Jones, G J Burton, M L Oyen
Placental oxygen transport takes place at the final branches of the villous tree and is dictated by the relative arrangement of the maternal and fetal circulations. Modeling techniques have failed to accurately assess the structure-function relationship in the terminal villi due to the geometrical complexity. Three-dimensional blood flow and oxygen transport was modeled in four terminal villi reconstructed from confocal image stacks. The blood flow was analyzed along the center lines of capillary segments and the effect of the variability in capillary diameter, tortuosity and branching was investigated...
December 8, 2016: Journal of Biomechanics
https://www.readbyqxmd.com/read/28012870/stress-induces-equivalent-remodeling-of-hippocampal-spine-synapses-in-a-simulated-postpartum-environment-and-in-a-female-rat-model-of-major-depression
#14
Judith Baka, Eszter Csakvari, Orsolya Huzian, Nikoletta Dobos, Laszlo Siklos, Csaba Leranth, Neil J MacLusky, Ronald S Duman, Tibor Hajszan
Stress and withdrawal of female reproductive hormones are known risk factors of postpartum depression. Although both of these factors are capable of powerfully modulating neuronal plasticity, there is no direct electron microscopic evidence of hippocampal spine synapse remodeling in postpartum depression. To address this issue, hormonal conditions of pregnancy and postpartum period were simulated in ovariectomized adult female Sprague-Dawley rats (n=76). The number of hippocampal spine synapses and the depressive behavior of rats in an active escape task were investigated in untreated control, hormone-withdrawn 'postpartum', simulated proestrus, and hormone-treated 'postpartum' animals...
February 20, 2017: Neuroscience
https://www.readbyqxmd.com/read/28003175/design-of-a-serious-game-for-handling-obstetrical-emergencies
#15
Estelle Jean Dit Gautier, Virginie Bot-Robin, Aurélien Libessart, Guillaume Doucède, Michel Cosson, Chrystèle Rubod
BACKGROUND: The emergence of new technologies in the obstetrical field should lead to the development of learning applications, specifically for obstetrical emergencies. Many childbirth simulations have been recently developed. However, to date none of them have been integrated into a serious game. OBJECTIVE: Our objective was to design a new type of immersive serious game, using virtual glasses to facilitate the learning of pregnancy and childbirth pathologies...
December 21, 2016: JMIR Serious Games
https://www.readbyqxmd.com/read/28000917/simulating-demand-for-cigarettes-among-pregnant-women-a-low-risk-method-for-studying-vulnerable-populations
#16
Stephen T Higgins, Derek D Reed, Ryan Redner, Joan M Skelly, Ivori A Zvorsky, Allison N Kurti
A substantive obstacle to experimentally studying cigarette smoking and use of other tobacco products in pregnant women is the risk of adverse effects on mother and fetus from experimenter administration of the product of interest. The purpose of this study is to investigate bypassing that obstacle by using behavioral economic simulation tasks. In the present study we used the Cigarette Purchase Task (CPT) to simulate changes in demand for hypothetical cigarettes as a function of varying cigarette prices. Participants were 95 pregnant women who completed the CPT prior to participation in a smoking-cessation trial...
January 2017: Journal of the Experimental Analysis of Behavior
https://www.readbyqxmd.com/read/27966666/measurement-error-in-mobile-source-air-pollution-exposure-estimates-due-to-residential-mobility-during-pregnancy
#17
Audrey Flak Pennington, Matthew J Strickland, Mitchel Klein, Xinxin Zhai, Armistead G Russell, Craig Hansen, Lyndsey A Darrow
Prenatal air pollution exposure is frequently estimated using maternal residential location at the time of delivery as a proxy for residence during pregnancy. We describe residential mobility during pregnancy among 19,951 children from the Kaiser Air Pollution and Pediatric Asthma Study, quantify measurement error in spatially resolved estimates of prenatal exposure to mobile source fine particulate matter (PM2.5) due to ignoring this mobility, and simulate the impact of this error on estimates of epidemiologic associations...
December 14, 2016: Journal of Exposure Science & Environmental Epidemiology
https://www.readbyqxmd.com/read/27920035/an-infant-simulator-programme-did-not-reduce-teenage-pregnancy
#18
Giordano Pérez-Gaxiola
No abstract text is available yet for this article.
December 5, 2016: Archives of Disease in Childhood. Education and Practice Edition
https://www.readbyqxmd.com/read/27891739/acardiac-twin-pregnancies-part-iv-acardiac-onset-from-unequal-embryonic-splitting-simulated-by-a-fetoplacental-resistance-model
#19
Martin J C van Gemert, Jeroen P H M van den Wijngaard, K Marieke Paarlberg, Helena M Gardiner, Peter G J Nikkels
BACKGROUND: Benirschke postulated that acardiac twinning occurs when markedly unequal embryonic splitting combines with arterioarterial (AA) and venovenous placental anastomoses. We tested this hypothesis by model simulations and by comparison of outcomes with 18 "pseudo-" (twin fetus with beating heart but otherwise with clear signs of an acardiac) and 3 "normal" acardiac cases. METHODS: The smaller/larger cell volume ratio at embryonic splitting becomes the smaller/larger embryonic/fetal blood volume ratio (a)...
November 28, 2016: Birth Defects Research. Part A, Clinical and Molecular Teratology
https://www.readbyqxmd.com/read/27887718/novel-centrifugal-technology-for-measuring-sperm-concentration-in-the-home
#20
Ulrich Y Schaff, Laura L Fredriksen, Jon G Epperson, Tiffany R Quebral, Sara Naab, Mark J Sarno, Michael L Eisenberg, Greg J Sommer
OBJECTIVE: To evaluate the analytical performance and usability of the Trak Male Fertility Testing System, a semiquantitative (categorical) device recently US Food and Drug Administration (FDA)-cleared for measuring sperm concentration in the home by untrained users. DESIGN: A three-site clinical trial comparing self-reported lay user results versus reference results obtained by computer-aided semen analysis (CASA). SETTING: Simulated home use environments at fertility centers and urologist offices...
February 2017: Fertility and Sterility
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