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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
#1
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...
January 12, 2017: Lancet Global Health
https://www.readbyqxmd.com/read/28048319/su-f-p-19-fetal-dose-estimate-for-a-high-dose-fluoroscopy-guided-intervention-using-modern-data-tools
#2
J Moirano
PURPOSE: An accurate dose estimate is necessary for effective patient management after a fetal exposure. In the case of a high-dose exposure, it is critical to use all resources available in order to make the most accurate assessment of the fetal dose. This work will demonstrate a methodology for accurate fetal dose estimation using tools that have recently become available in many clinics, and show examples of best practices for collecting data and performing the fetal dose calculation...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28029359/computational-modeling-of-the-structure-function-relationship-in-human-placental-terminal-villi
#3
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...
October 12, 2016: Journal of Biomechanics
https://www.readbyqxmd.com/read/28003175/design-of-a-serious-game-for-handling-obstetrical-emergencies
#4
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/27943372/imperfect-practice-makes-perfect-error-management-training-improves-transfer-of-learning
#5
Liv Dyre, Ann Tabor, Charlotte Ringsted, Martin G Tolsgaard
CONTEXT: Traditionally, trainees are instructed to practise with as few errors as possible during simulation-based training. However, transfer of learning may improve if trainees are encouraged to commit errors. The aim of this study was to assess the effects of error management instructions compared with error avoidance instructions during simulation-based ultrasound training. METHODS: Medical students (n = 60) with no prior ultrasound experience were randomised to error management training (EMT) (n = 32) or error avoidance training (EAT) (n = 28)...
February 2017: Medical Education
https://www.readbyqxmd.com/read/27924908/development-of-novel-noninvasive-prenatal-testing-protocol-for-whole-autosomal-recessive-disease-using-picodroplet-digital-pcr
#6
Mun Young Chang, Ah Reum Kim, Min Young Kim, Soyoung Kim, Jinsun Yoon, Jae Joon Han, Soyeon Ahn, Changsoo Kang, Byung Yoon Choi
We developed a protocol of noninvasive prenatal testing (NIPT), employing a higher-resolution picodroplet digital PCR, to detect genetic imbalance in maternal plasma DNA (mpDNA) caused by cell-free fetal DNA (cffDNA). In the present study, this approach was applied to four families with autosomal recessive (AR) congenital sensorineural hearing loss. First, a fraction of the fetal DNA in mpDNA was calculated. Then, we made artificial DNA mixtures (positive and negative controls) to simulate mpDNA containing the fraction of cffDNA with or without mutations...
December 7, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27897008/tracing-co-regulatory-network-dynamics-in-noisy-single-cell-transcriptome-trajectories
#7
Pablo Cordero, Joshua M Stuart
The availability of gene expression data at the single cell level makes it possible to probe the molecular underpinnings of complex biological processes such as differentiation and oncogenesis. Promising new methods have emerged for reconstructing a progression 'trajectory' from static single-cell transcriptome measurements. However, it remains unclear how to adequately model the appreciable level of noise in these data to elucidate gene regulatory network rewiring. Here, we present a framework called Single Cell Inference of MorphIng Trajectories and their Associated Regulation (SCIMITAR) that infers progressions from static single-cell transcriptomes by employing a continuous parametrization of Gaussian mixtures in high-dimensional curves...
2016: Pacific Symposium on Biocomputing
https://www.readbyqxmd.com/read/27891739/acardiac-twin-pregnancies-part-iv-acardiac-onset-from-unequal-embryonic-splitting-simulated-by-a-fetoplacental-resistance-model
#8
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/27884665/airway-management-for-cesarean-delivery-performed-under-general-anesthesia
#9
S Rajagopalan, M Suresh, S L Clark, B Serratos, S Chandrasekhar
BACKGROUND: With the increasing popularity of neuraxial anesthesia, there has been a decline in the use of general anesthesia for cesarean delivery. We sought to examine the incidence, outcome and characteristics associated with a failed airway in patients undergoing cesarean delivery under general anesthesia. METHODS: A retrospective review of airway management in women undergoing cesarean delivery under general anesthesia over an eight-year period from 2006-2013 at an academic medical center was conducted...
October 27, 2016: International Journal of Obstetric Anesthesia
https://www.readbyqxmd.com/read/27854395/prediction-of-stillbirth-from-placental-growth-factor-at-19-24-weeks
#10
J E Aupont, R Akolekar, A Illian, S Neonakis, K H Nicolaides
OBJECTIVES: To investigate whether the addition of maternal serum placental growth factor (PlGF) measured at 19-24 weeks' gestation improves the performance of screening for stillbirth that is achieved by a combination of maternal factors, fetal biometry and uterine artery pulsatility index (UtA-PI) and to evaluate the performance of screening with this model for all stillbirths and those due to impaired placentation and unexplained or other causes. METHODS: This was a prospective screening study of 70 003 singleton pregnancies including 268 stillbirths, carried out in two phases...
November 2016: Ultrasound in Obstetrics & Gynecology
https://www.readbyqxmd.com/read/27853245/mechanism-of-consistent-gyrus-formation-an-experimental-and-computational-study
#11
Tuo Zhang, Mir Jalil Razavi, Xiao Li, Hanbo Chen, Tianming Liu, Xianqiao Wang
As a significant type of cerebral cortical convolution pattern, the gyrus is widely preserved across species. Although many hypotheses have been proposed to study the underlying mechanisms of gyrus formation, it is currently still far from clear which factors contribute to the regulation of consistent gyrus formation. In this paper, we employ a joint analysis scheme of experimental data and computational modeling to investigate the fundamental mechanism of gyrus formation. Experimental data on mature human brains and fetal brains show that thicker cortices are consistently found in gyral regions and gyral cortices have higher growth rates...
November 17, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27845652/a-fixed-lag-kalman-smoother-to-filter-power-line-interference-in-electrocardiogram-recordings
#12
Guy J J Warmerdam, Rik Vullings, Lars Schmitt, Judith O E H van Laar, Jan W M Bergmans
OBJECTIVE: Filtering power line interference (PLI) from electrocardiogram (ECG) recordings can lead to significant distortions of the ECG and mask clinically relevant features in ECG waveform morphology. The objective of this study is to filter PLI from ECG recordings with minimal distortion of the ECG waveform. METHODS: In this paper, we propose a fixed-lag Kalman smoother with adaptive noise estimation. The performance of this Kalman smoother in filtering PLI is compared to that of a fixedbandwidth notch filter and several adaptive PLI filters that have been proposed in the literature...
November 8, 2016: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/27834868/steric-clash-in-the-set-domain-of-histone-methyltransferase-nsd1-as-a-cause-of-sotos-syndrome-and-its-genetic-heterogeneity-in-a-brazilian-cohort
#13
Kyungsoo Ha, Priya Anand, Jennifer A Lee, Julie R Jones, Chong Ae Kim, Debora Romeo Bertola, Jonathan D J Labonne, Lawrence C Layman, Wolfgang Wenzel, Hyung-Goo Kim
Most histone methyltransferases (HMTase) harbor a predicted Su(var)3-9, Enhancer-of-zeste, Trithorax (SET) domain, which transfers a methyl group to a lysine residue in their substrates. Mutations of the SET domains were reported to cause intellectual disability syndromes such as Sotos, Weaver, or Kabuki syndromes. Sotos syndrome is an overgrowth syndrome with intellectual disability caused by haploinsufficiency of the nuclear receptor binding SET domain protein 1 (NSD1) gene, an HMTase at 5q35.2-35.3. Here, we analyzed NSD1 in 34 Brazilian Sotos patients and identified three novel and eight known mutations...
November 9, 2016: Genes
https://www.readbyqxmd.com/read/27824565/visualization-of-small-diameter-vessels-by-reduction-of-incoherent-reverberation-with-coherent-flow-power-doppler
#14
You Leo Li, Dongwoon Hyun, Lotfi Abou-Elkacem, Juergen Karl Willmann, Jeremy J Dahl
Power Doppler (PD) imaging is a widely used technique for flow detection. Despite the wide use of Doppler ultrasound, limitations exist in the ability of Doppler ultrasound to assess slow flow in the small-diameter vasculature, such as the maternal spiral arteries and fetal villous arteries of the placenta and focal liver lesions. The sensitivity of PD in small vessel detection is limited by the low signal produced by slow flow and the noise associated with small vessels. The noise sources include electronic noise, stationary or slowly moving tissue clutter, reverberation clutter, and off-axis scattering from tissue, among others...
November 2016: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/27788214/image-based-modeling-of-blood-flow-and-oxygen-transfer-in-feto-placental-capillaries
#15
Philip Pearce, Paul Brownbill, Jiří Janáček, Marie Jirkovská, Lucie Kubínová, Igor L Chernyavsky, Oliver E Jensen
During pregnancy, oxygen diffuses from maternal to fetal blood through villous trees in the placenta. In this paper, we simulate blood flow and oxygen transfer in feto-placental capillaries by converting three-dimensional representations of villous and capillary surfaces, reconstructed from confocal laser scanning microscopy, to finite-element meshes, and calculating values of vascular flow resistance and total oxygen transfer. The relationship between the total oxygen transfer rate and the pressure drop through the capillary is shown to be captured across a wide range of pressure drops by physical scaling laws and an upper bound on the oxygen transfer rate...
2016: PloS One
https://www.readbyqxmd.com/read/27769989/statistical-methods-for-unusual-count-data-examples-from-studies-of-microchimerism
#16
Katherine A Guthrie, Hilary S Gammill, Mads Kamper-Jørgensen, Anne Tjønneland, Vijayakrishna K Gadi, J Lee Nelson, Wendy Leisenring
Natural acquisition of small amounts of foreign cells or DNA, referred to as microchimerism, occurs primarily through maternal-fetal exchange during pregnancy. Microchimerism can persist long-term and has been associated with both beneficial and adverse human health outcomes. Quantitative microchimerism data present challenges for statistical analysis, including a skewed distribution, excess zero values, and occasional large values. Methods for comparing microchimerism levels across groups while controlling for covariates are not well established...
October 21, 2016: American Journal of Epidemiology
https://www.readbyqxmd.com/read/27765090/-effects-of-severe-hypoxia-and-low-concentration-of-serum-protein-on-the-function-of-human-hypertrophic-scar-fibroblasts
#17
J Y Dong, F Song, Y K Liu, X Q Wang
Objective: To simulate the environmental factors during the process of formation and evolution of hypertrophic scar, so as to explore the effects of moderate and severe hypoxia and low concentration of serum protein on the function of human hypertrophic scar fibroblasts (HSFs). Methods: Human HSFs were routinely cultured. Cells of the 3rd to the 6th passage were divided into 10.0% oxygen+ 10.0% fetal calf serum (FCS), 5.0% oxygen+ 5.0% FCS, and 0.5% oxygen+ 0.5% FCS groups according to the random number table...
October 20, 2016: Zhonghua Shao Shang za Zhi, Zhonghua Shaoshang Zazhi, Chinese Journal of Burns
https://www.readbyqxmd.com/read/27755062/amniotic-fluid-embolism
#18
Courtney Stanley Sundin, Lauren Bradham Mazac
Amniotic fluid embolism (AFE) is a rare but serious and potentially deadly complication of pregnancy that is unpreventable and unpredictable. Most AFE events occur during labor; however, approximately one third happen during the immediate postpartum period. Presentation is abrupt and thought to be an abnormal response to fetal materials entering maternal circulation through the placental insertion site. Care providers must recognize the signs and symptoms of AFE and react quickly to treat potential complications...
January 2017: MCN. the American Journal of Maternal Child Nursing
https://www.readbyqxmd.com/read/27740478/visualization-of-small-diameter-vessels-by-reduction-of-incoherent-reverberation-with-coherent-flow-power-doppler
#19
You Li, Dongwoon Hyun, Lotfi Abou-Elkacem, Juergen Willmann, Jeremy Dahl
Power Doppler (PD) imaging is a widely used technique for flow detection. Despite the wide use of Doppler ultrasound, limitations exist in the ability of Doppler ultrasound to assess slow flow in small-diameter vasculature, such as the maternal spiral arteries and fetal villous arteries of the placenta and focal liver lesions. The sensitivity of PD in small vessel detection is limited by the low signal produced by slow flow and the noise associated with small vessels. The noise sources include electronic noise, stationary or slowly moving tissue clutter, reverberation clutter, and off-axis scattering from tissue, among others...
October 10, 2016: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/27703492/a-fetal-electrocardiogram-signal-extraction-algorithm-based-on-fast-one-unit-independent-component-analysis-with-reference
#20
Yanfei Jia, Xiaodong Yang
Fetal electrocardiogram (FECG) extraction is very important procedure for fetal health assessment. In this article, we propose a fast one-unit independent component analysis with reference (ICA-R) that is suitable to extract the FECG. Most previous ICA-R algorithms only focused on how to optimize the cost function of the ICA-R and payed little attention to the improvement of cost function. They did not fully take advantage of the prior information about the desired signal to improve the ICA-R. In this paper, we first use the kurtosis information of the desired FECG signal to simplify the non-Gaussian measurement function and then construct a new cost function by directly using a nonquadratic function of the extracted signal to measure its non-Gaussianity...
2016: Computational and Mathematical Methods in Medicine
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