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https://www.readbyqxmd.com/read/28869670/pulmonary-embolism-in-pregnant-patients-assessing-organ-dose-to-pregnant-phantom-and-its-fetus-during-lung-imaging
#1
Laleh Rafat Motavalli, Elie Hoseinian Azghadi, Hashem Miri Hakimabad, Parisa Akhlaghi
PURPOSE: To provide updated radiation dose from diagnostic exams performed for pregnant patients suspected of pulmonary embolism (PE) using the recently developed BREP phantoms of pregnant woman and the fetus. Also to challenge the validity of current recommendations suggest that ventilation/perfusion (V/Q) single photon emission computed tomography (SPECT) vs. computed tomography pulmonary angiography (CTPA) should be considered for diagnosis of PE in radiosensitive groups such as pregnant women...
September 4, 2017: Medical Physics
https://www.readbyqxmd.com/read/28869420/improved-ultrasound-transducer-positioning-by-fetal-heart-location-estimation-during-doppler-based-heart-rate-measurements
#2
Paul Hamelmann, Rik Vullings, Lars Schmitt, Alexander Franciscus Kolen, Massimo Mischi, Judith O E H Van Laar, Jan W M Bergmans
Doppler Ultrasound (US) is the most commonly applied method to measure the fetal heart rate (fHR). When the fetal heart is not properly located within the ultrasonic beam, fHR measurements often fail. As a consequence, clinical staff needs to reposition the US transducer on the maternal abdomen, which can be a time consuming and tedious task. In this article, a method is presented to aid clinicians with the positioning of the US transducer to produce robust fHR measurements. A maximum likelihood estimation (MLE) algorithm is developed, which provides information on fetal heart location using the power of the Doppler signals received in the individual elements of a standard US transducer for fHR recordings...
September 4, 2017: Physiological Measurement
https://www.readbyqxmd.com/read/28833523/modeling-of-coarctation-of-aorta-in-human-fetuses-using-3d-4d-fetal-echocardiography-and-computational-fluid-dynamics
#3
Zhuo Chen, Yue Zhou, Jingying Wang, Xiaowei Liu, Shuping Ge, Yihua He
OBJECTIVES: We sought to develop a hemodynamic model of aortic and ductal arches using computational fluid dynamics (CFD) and 3D/4D spatio-temporal image correlation (STIC) fetal echocardiography and to investigate the hemodynamics of coarctation of aorta (CoA) in human fetuses using this approach. METHODS: We obtained 3D/4D STIC fetal echocardiographic images of the aortic and ductal arches (DA) in five normal fetuses. Based on these images, we simulated the hemodynamics in the two arches using CFD...
August 22, 2017: Echocardiography
https://www.readbyqxmd.com/read/28826368/impact-of-galectin-1-on-trophoblast-stem-cell-differentiation-and-invasion-in-in-vitro-implantation-model
#4
Minyue Tang, Jiali You, Wei Wang, Yongchao Lu, Xiaoling Hu, Chunyan Wang, Aixia Liu, Yimin Zhu
Trophoblast stem cells (TSCs) differentiate in an orderly manner, which plays an important role in the process of embryo implantation, placentation, and early pregnancy maintenance. At the maternal-fetal interface, the dialogue is crucial between trophoblast cells and endometrial epithelial cells. Previous studies suggested that galectin-1 (Gal-1) may play an important role in placental development. In this study, we used Ishikawa (IK) cells-TSC coculture model to simulate the maternal-fetal interface and induce the differentiation of TSCs by differentiation media...
January 1, 2017: Reproductive Sciences
https://www.readbyqxmd.com/read/28744795/prediction-of-fetal-darunavir-exposure-by-integrating-human-ex-vivo-placental-transfer-and-physiologically-based-pharmacokinetic-modeling
#5
Stein Schalkwijk, Aaron O Buaben, Jolien J M Freriksen, Angela P Colbers, David M Burger, Rick Greupink, Frans G M Russel
BACKGROUND: Fetal antiretroviral exposure is usually derived from the cord-to-maternal concentration ratio. This static parameter does not provide information on the pharmacokinetics in utero, limiting the assessment of a fetal exposure-effect relationship. OBJECTIVE: The aim of this study was to incorporate placental transfer into a pregnancy physiologically based pharmacokinetic model to simulate and evaluate fetal darunavir exposure at term. METHODS: An existing and validated pregnancy physiologically based pharmacokinetic model of maternal darunavir/ritonavir exposure was extended with a feto-placental unit...
July 25, 2017: Clinical Pharmacokinetics
https://www.readbyqxmd.com/read/28743074/coronary-perfusion-pressure-and-compression-quality-in-maternal-cardiopulmonary-resuscitation-in-supine-and-left-lateral-tilt-positions-a-prospective-crossover-study-using-mannequins-and-swine-models
#6
Satoshi Dohi, Kiyotake Ichizuka, Ryu Matsuoka, Kohei Seo, Masaaki Nagatsuka, Akihiko Sekizawa
OBJECTIVE: The risk of maternal and fetal mortality is high if cardiopulmonary arrest occurs during pregnancy. To assess the best position for maternal cardiopulmonary resuscitation (CPR), a prospective randomized crossover study was undertaken, involving basic life support mannequin-based simulation (BLS-MS) and a swine model of pulseless electrical activity (an unstable cardiac state) incorporating a fetal mannequin (PEA-FM). STUDY DESIGN: The BLS-MS (performed by certified rescuers) served to evaluate the quality of chest compressions in 30° left lateral tilt (LLT) and supine positions...
July 16, 2017: European Journal of Obstetrics, Gynecology, and Reproductive Biology
https://www.readbyqxmd.com/read/28721492/peristaltic-like-motion-of-the-human-fetal-right-ventricle-and-its-effects-on-fluid-dynamics-and-energy-dynamics
#7
Hadi Wiputra, Guat Ling Lim, Khong Chun Chua, R Nivetha, Sanah Merchant Soomar, Arijit Biwas, Citra Nurfarah Zaini Mattar, Hwa Liang Leo, Choon Hwai Yap
In both adult human and canine, the cardiac right ventricle (RV) is known to exhibit a peristaltic-like motion, where RV sinus (inflow region) contracts first and the infundibulum (outflow region) later, in a wave-like contraction motion. The delay in contraction between the sinus and infundibulum averaged at 15% of the cardiac cycle and was estimated to produce an intra-ventricular pressure difference of 15 mmHg. However, whether such a contractile motion occurs in human fetuses as well, its effects on hemodynamics remains unknown, and are the subject of the current study...
July 18, 2017: Annals of Biomedical Engineering
https://www.readbyqxmd.com/read/28715785/prenatal-exposure-estimation-of-bpa-and-dehp-using-integrated-external-and-internal-dosimetry-a-case-study
#8
M A Martínez, J Rovira, R Prasad Sharma, M Nadal, M Schuhmacher, V Kumar
Prenatal exposure to Endocrine disruptors (EDs), such as Bisphenol A (BPA) and di (2-ethylhexyl) phthalate (DEHP), has been associated with obesity and diabetes diseases in childhood, as well as reproductive, behavioral and neurodevelopment problems. The aim of this study was to estimate the prenatal exposure to BPA and DEHP through food consumption for pregnant women living in Tarragona County (Spain). Probabilistic calculations of prenatal exposure were estimated by integrated external and internal dosimetry modelling, physiologically based pharmacokinetic (PBPK) model, using a Monte-Carlo simulation...
October 2017: Environmental Research
https://www.readbyqxmd.com/read/28699402/the-management-of-episiotomy-technique-and-its-effect-on-pelvic-floor-muscles-during-a-malposition-childbirth
#9
Dulce A Oliveira, Marco P L Parente, Begoña Calvo, Teresa Mascarenhas, Renato M Natal Jorge
Vaginal childbirth is the leading cause of pelvic floor muscles injury, which contributes to pelvic floor dysfunction, being enhanced by fetal malposition. Therefore, the aim of the present study is to verify the influence of mediolateral episiotomies in the mechanics of the pelvic floor with the fetus in occiput posterior position when compared to the occiput anterior position. Numerical simulations of vaginal deliveries, with and without episiotomy, are performed based on the Finite Element Method. The biomechanical model includes the pelvic floor muscles, a surface to delimit the anterior region of the birth canal and a fetus...
August 2017: Computer Methods in Biomechanics and Biomedical Engineering
https://www.readbyqxmd.com/read/28692489/the-estimation-of-gestational-age-at-birth-in-database-studies
#10
Maria Eberg, Robert W Platt, Kristian B Filion
BACKGROUND: Studies on the safety of prenatal medication use require valid estimation of the pregnancy duration. However, gestational age is often incompletely recorded in administrative and clinical databases. Our objective was to compare different approaches to estimating the pregnancy duration. METHODS: Using data from the Clinical Practice Research Datalink and Hospital Episode Statistics, we examined four approaches to estimating missing gestational age: 1) generalized estimating equations for longitudinal data; 2) multiple imputation; 3) estimation based on fetal birth weight and sex; and 4) conventional approaches that assigned a fixed value (39 weeks for all or 39 weeks for full term and 35 weeks for preterm)...
July 7, 2017: Epidemiology
https://www.readbyqxmd.com/read/28688135/-lying-down-adrenal-sign-there-are-exceptions-to-the-rule-among-fetuses-and-neonates
#11
Anand Majmudar, Harris L Cohen
A linear-shaped or "lying-down" adrenal gland is a sign often seen with the absence of the kidney in the renal fossa due to renal agenesis, renal ectopia, or horseshoe kidney. It is theorized that the presence of the kidney in the normal location within the renal fossa is important for the formation of the normal triangular inverted V or Y adrenal shape. There are exceptions to this rule whereby a kidney is missing from the renal fossa, yet a normal adrenal shape is present. This series looked at 18 cases of an empty renal fossa in fetal, neonatal, and pediatric patients and recorded the shape of the adrenal gland...
July 8, 2017: Journal of Ultrasound in Medicine: Official Journal of the American Institute of Ultrasound in Medicine
https://www.readbyqxmd.com/read/28683661/an-efficient-sampling-strategy-for-selection-of-biobank-samples-using-risk-scores
#12
Jonas Björk, Ebba Malmqvist, Lars Rylander, Anna Rignell-Hydbom
AIM: The aim of this study was to suggest a new sample-selection strategy based on risk scores in case-control studies with biobank data. METHODS: An ongoing Swedish case-control study on fetal exposure to endocrine disruptors and overweight in early childhood was used as the empirical example. Cases were defined as children with a body mass index (BMI) ⩾18 kg/m(2) ( n=545) at four years of age, and controls as children with a BMI of ⩽17 kg/m(2) ( n=4472 available)...
July 2017: Scandinavian Journal of Public Health
https://www.readbyqxmd.com/read/28678541/mechanical-role-of-a-growing-solid-tumor-on-cortical-folding
#13
Mir Jalil Razavi, Mary Reeves, Xianqiao Wang
Cortical folding, or convolution of the brain, is a vital process in mammals that causes the brain to have a wrinkled appearance. The existence of different types of prenatal solid tumors may alter this complex phenomenon and cause severe brain disorders. Here we interpret the effects of a growing solid tumor on the cortical folding in the fetal brain by virtue of theoretical analyses and computational modeling. The developing fetal brain is modeled as a simple, double-layered, and soft structure with an outer cortex and an inner core, in combination with a circular tumor model imbedded in the structure to investigate the developmental mechanism of cortical convolution...
July 5, 2017: Computer Methods in Biomechanics and Biomedical Engineering
https://www.readbyqxmd.com/read/28635670/single-lead-fetal-ecg-extraction-based-on-a-parallel-marginalized-particle-filter
#14
Zhidong Zhao, Huiling Tong, Yanjun Deng, Wen Xu, Yefei Zhang, Haihui Ye
This paper presents a novel method for extracting the fetal ECG (FECG) from a single-lead abdominal signal. A dynamical model for a modified abdominal signal is proposed, in which both the maternal ECG (MECG) and the FECG are modeled, and then a parallel marginalized particle filter (par-MPF) is used for tracking the abdominal signal. Finally, the FECG and MECG are simultaneously separated. Several experiments are conducted using both simulated and clinical signals. The results indicate that the method proposed in this paper effectively extracts the FECG and outperforms other Bayesian filtering algorithms...
June 21, 2017: Sensors
https://www.readbyqxmd.com/read/28635050/prediction-of-sustained-fetal-toxicity-induced-by-ketoprofen-based-on-pk-pd-analysis-using-human-placental-perfusion-and-rat-toxicity-data
#15
Shingo Tanaka, Takeshi Kanagawa, Kazuo Momma, Satoko Hori, Hiroki Satoh, Takeshi Nagamatsu, Tomoyuki Fujii, Tadashi Kimura, Yasufumi Sawada
AIM: We encountered a case of fetal toxicity due to ductus arteriosus (DA) constriction in a 36-week pregnant woman who had applied multiple ketoprofen patches. The aim of the present study was to present the case and develop a model to predict quantitatively the fetal toxicity risk of transdermal administration of ketoprofen. METHODS: Human placenta perfusion studies were conducted to estimate transplacental pharmacokinetic (PK) parameters. Using a developed model and these parameters, human fetal plasma concentration profiles of ketoprofen administered to mothers were simulated...
June 21, 2017: British Journal of Clinical Pharmacology
https://www.readbyqxmd.com/read/28634788/consistent-reconstruction-of-4d-fetal-heart-ultrasound-images-to-cope-with-fetal-motion
#16
Christine Tanner, Barbara Flach, Céline Eggenberger, Oliver Mattausch, Michael Bajka, Orcun Goksel
PURPOSE: 4D ultrasound imaging of the fetal heart relies on reconstructions from B-mode images. In the presence of fetal motion, current approaches suffer from artifacts, which are unrecoverable for single sweeps. METHODS: We propose to use many sweeps and exploit the resulting redundancy to automatically recover from motion by reconstructing a 4D image which is consistent in phase, space, and time. An interactive visualization framework to view animated ultrasound slices from 4D reconstructions on arbitrary planes was developed using a magnetically tracked mock probe...
August 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28626076/cardiac-fibroblast-transcriptome-analyses-support-a-role-for-interferogenic-profibrotic-and-inflammatory-genes-in-anti-ssa-ro-associated-congenital-heart-block
#17
Robert M Clancy, Androo J Markham, Tanisha Jackson, Sara E Rasmussen, Miroslav Blumenberg, Jill P Buyon
The signature lesion of SSA/Ro autoantibody-associated congenital heart block (CHB) is fibrosis and a macrophage infiltrate, supporting an experimental focus on cues influencing the fibroblast component. The transcriptomes of human fetal cardiac fibroblasts were analyzed using two complementary approaches. Cardiac injury conditions were simulated in vitro by incubating human fetal cardiac fibroblasts with supernatants from macrophages transfected with the SSA/Ro-associated hY3. The top ten upregulated transcripts in the stimulated fibroblasts reflected a type I interferon (IFN) response (e...
June 16, 2017: American Journal of Physiology. Heart and Circulatory Physiology
https://www.readbyqxmd.com/read/28622144/a-technological-advance-for-21st-century-obstetricians-the-electronically-controlled-vacuum-extractor
#18
Nicola Perone
OBJECTIVE: To describe an innovative electronically-controlled vacuum extractor (VE) in detail and to illustrate its performance characteristics, as observed in a laboratory study. DESIGN: Thirty simulated, vacuum-assisted deliveries. MAIN OUTCOME MEASURE(S): (1) The ability to measure in real-time of the pull applied and to sound an alert, when the traction approaches the negative pressure under the cup, to prevent its detachment. (2) The recording and printing of a graphic representation of the pull applied (vacuum delivery graph)...
June 5, 2017: Journal of Perinatal Medicine
https://www.readbyqxmd.com/read/28612629/uterine-artery-pulsatility-index-in-the-first-trimester-assessment-of-intersonographer-and-intersampling-site-measurement-differences
#19
Piya Chaemsaithong, Yuen Ha Ting, Kwun Yue Yvonne Cheng, Chiu Yee Liona Poon, Tak Yeung Leung, Daljit Singh Sahota
OBJECTIVE: To determine intersonographer, intersampling site pulsatility index differences in the ascending branch of the uterine artery (UtA-PI) and their effect on detection rates (DR) for early onset preeclampsia (PE). METHODS: A prospective observational study was conducted including 52 women with singleton viable pregnancy at 11-13 weeks' gestation. Consecutive bilateral UtA-PI measurements were performed by two sonographers. Both sonographers hold the Fetal Medicine Foundation (FMF) uterine artery Doppler assessment competency certificates...
July 11, 2017: Journal of Maternal-fetal & Neonatal Medicine
https://www.readbyqxmd.com/read/28589614/optimization-of-maternal-magnesium-sulfate-administration-for-fetal-neuroprotection-application-of-a-prospectively-constructed-pharmacokinetic-model-to-the-beam-cohort
#20
Kathleen F Brookfield, Mohammed Elkomy, Felice Su, David R Drover, Brendan Carvalho
The aim of the study was to identify the optimal therapeutic maternal magnesium drug exposure and maternal serum concentration to prevent cerebral palsy in the extremely preterm fetus. We applied a previously constructed pharmacokinetic model adjusted for indication to a large cohort of pregnant women receiving magnesium sulfate to prevent cerebral palsy in their preterm offspring at 20 different US academic centers between December 1997 and May 2004. We simulated the population-based individual maternal serum magnesium concentration at the time of delivery and the total magnesium dose for each woman who received magnesium sulfate to determine the relationship between maternal serum magnesium level at the time of delivery and the development of cerebral palsy...
June 6, 2017: Journal of Clinical Pharmacology
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