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Fetal doppler ultrasound

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https://www.readbyqxmd.com/read/28912727/a-hybrid-emd-kurtosis-method-for-estimating-fetal-heart-rate-from-continuous-doppler-signals
#1
Haitham M Al-Angari, Yoshitaka Kimura, Leontios J Hadjileontiadis, Ahsan H Khandoker
Monitoring of fetal heart rate (FHR) is an important measure of fetal wellbeing during the months of pregnancy. Previous works on estimating FHR variability from Doppler ultrasound (DUS) signal mainly through autocorrelation analysis showed low accuracy when compared with heart rate variability (HRV) computed from fetal electrocardiography (fECG). In this work, we proposed a method based on empirical mode decomposition (EMD) and the kurtosis statistics to estimate FHR and its variability from DUS. Comparison between estimated beat-to-beat intervals using the proposed method and the autocorrelation function (AF) with respect to RR intervals computed from fECG as the ground truth was done on DUS signals from 44 pregnant mothers in the early (20 cases) and late (24 cases) gestational weeks...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28905984/fetal-intra-abdominal-umbilical-vein-aneurysm
#2
Stefano Raffaele Giannubilo, Angela Pasculli, Alessandro Cecchi, Alessandra Biagini, Andrea Ciavattini
Importance: Fetal umbilical vein aneurysm is an uncommon anomaly that accounts for approximately 4% of umbilical cord abnormalities. The rate of intrauterine fetal death is reported to be approximately 4% to 5%, higher than the background rate of 0.7% that is generally reported during pregnancy. Objective: The aim of this study was to review the pathophysiology, diagnosis, and clinical management of fetal umbilical vein aneurysm. Evidence Acquisition: Advances in high-resolution ultrasound combined with color Doppler and 3-dimensional rendering have contributed to an increased understanding of the fetal venous circulation in recent years...
September 2017: Obstetrical & Gynecological Survey
https://www.readbyqxmd.com/read/28869420/improved-ultrasound-transducer-positioning-by-fetal-heart-location-estimation-during-doppler-based-heart-rate-measurements
#3
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/28859279/the-superovulated-environment-independent-of-embryo-vitrification-results-in-low-birthweight-in-a-mouse-model
#4
Rachel Weinerman, Teri Ord, Marisa S Bartolomei, Christos Coutifaris, Monica Mainigi
Epidemiological studies suggest that babies born following in vitro fertilization (IVF) and fresh embryo transfer are of lower birthweight than babies born following frozen embryo transfer, although the mechanism responsible for this phenotype is not known. We developed a novel mouse model that isolates the independent effects of embryo freezing and the superovulated environment, which cannot be performed in humans. We transferred blastocysts that had been vitrified and warmed, mixed with with fresh blastocysts, into individual pseudopregnant recipients produced by either natural mating or mating following injection with equine chorionic gonadotropin and human chorionic gonadotropin and hCG (superovulation)...
July 1, 2017: Biology of Reproduction
https://www.readbyqxmd.com/read/28837134/clinician-performed-ultrasound-in-fetal-growth-restriction-fetal-neonatal-and-pediatric-aspects
#5
A Sehgal, F Crispi, M R Skilton, W-P de Boode
Fetal growth restriction (FGR) affects 7-10% pregnancies. Conventional and tissue Doppler imaging has noted cardiac compromise during fetal and early neonatal periods in this cohort. In this article, we discuss the use of salient ultrasound parameters across age groups. During fetal life, certain feto-placental sonographic parameters have been linked to adverse perinatal outcomes and are predictive of later life hypertension. During the early postnatal period altered morphometry (hypertrophied and globular hearts) with sub-clinical impairment of cardiac function has been noted in both term and preterm infants with FGR...
August 24, 2017: Journal of Perinatology: Official Journal of the California Perinatal Association
https://www.readbyqxmd.com/read/28809063/color-and-power-doppler-combined-with-fetal-intelligent-navigation-echocardiography-fine-to-evaluate-the-fetal-heart
#6
L Yeo, R Romero
OBJECTIVE: To evaluate the performance of color and bidirectional power Doppler ultrasound combined with Fetal Intelligent Navigation Echocardiography (FINE) in examining the fetal heart. METHODS: A prospective cohort study was conducted of fetuses in the second and third trimesters with a normal heart or with congenital heart disease (CHD). One or more spatiotemporal image correlation (STIC) volume datasets, combined with color or bidirectional power Doppler (S-flow) imaging, were acquired in the apical four-chamber view...
August 14, 2017: Ultrasound in Obstetrics & Gynecology
https://www.readbyqxmd.com/read/28769822/template-based-quality-assessment-of-the-doppler-ultrasound-signal-for-fetal-monitoring
#7
Camilo E Valderrama, Faezeh Marzbanrad, Lisa Stroux, Gari D Clifford
One dimensional Doppler Ultrasound (DUS) is a low cost method for fetal auscultation. However, accuracy of any metrics derived from the DUS signals depends on their quality, which relies heavily on operator skills. In low resource settings, where skill levels are sparse, it is important for the device to provide real time signal quality feedback to allow the re-recording of data. Retrospectively, signal quality assessment can help remove low quality recordings when processing large amounts of data. To this end, we proposed a novel template-based method, to assess DUS signal quality...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28768058/prenatal-influence-of-congenital-heart-defects-on-trajectories-of-cortical-folding-of-the-fetal-brain-using-three-dimensional-ultrasound
#8
Irene V Koning, Anne W van Graafeiland, Irene A L Groenenberg, Sofie C Husen, Attie T J I Go, Jeroen Dudink, Sten P Willemsen, Jerome M J Cornette, Régine P M Steegers-Theunissen
OBJECTIVE: To investigate the prenatal influence of congenital heart defects (CHD) on trajectories of fetal cortical folding using three-dimensional ultrasound (3D-US). METHOD: We included 20 CHD fetuses and 193 controls for studying the fetal brain at 22, 26 and 32 weeks gestational age (GA). The Sylvian, insula and parieto-occipital fissure (POF) depths were measured using 3D-US and reliability was evaluated. Doppler indices of the umbilical artery and middle cerebral artery were measured to calculate the cerebro-placental ratio (CPR)...
August 2, 2017: Prenatal Diagnosis
https://www.readbyqxmd.com/read/28743210/fetal-middle-cerebral-artery-doppler-in-late-term-pregnancy-a-predicting-factor-for-failed-induction-of-labor
#9
Silvia Vannuccini, Michela Torricelli, Caterina Bocchi, Filiberto M Severi, Mariarosaria Di Tommaso, Felice Petraglia
PURPOSE: To study the role of fetal middle cerebral artery (MCA) Doppler evaluated prior to induction of labor in late-term pregnancies, in order to build an ultrasound-based predictive model for failed induction. MATERIALS AND METHODS: A prospective cohort study on 250 nulliparous women carrying singleton late-term pregnancies was conducted. Prior to induction, each patient underwent to an ultrasound evaluation for fetal MCA Doppler. Additional ultrasound parameters such as cervical length (CL), membranes thickness, amniotic fluid index, placental location, and estimated fetal weight (EFW) were collected...
July 25, 2017: Journal of Maternal-fetal & Neonatal Medicine
https://www.readbyqxmd.com/read/28738721/the-clinical-value-of-maternal-and-fetal-doppler-parameters-in-low-risk-postdates-pregnancies-a-prospective-study
#10
Oshrit Lebovitz, Eran Barzilay, Shali Mazaki-Tovi, Itai Gat, Reuven Achiron, Yinon Gilboa
OBJECTIVE: The objective of this study is to determine the clinical significance of maternal and fetal ultrasound Doppler flow indices in postdates pregnancies. METHODS: This prospective study comprised 120 low-risk pregnant women beyond 40 weeks of gestation. All participants underwent Doppler assessment including of fetal middle cerebral artery (MCA), umbilical, and uterine arteries. Perinatal outcomes were recorded and evaluated for possible associations with Doppler flow values...
August 9, 2017: Journal of Maternal-fetal & Neonatal Medicine
https://www.readbyqxmd.com/read/28718893/association-between-maternal-vascular-murmur-and-the-small-for-gestational-age-fetus-with-abnormal-umbilical-artery-doppler-flow
#11
Diana Riknagel, Richard Farlie, Morten Hedegaard, Peter Humaidan, Johannes J Struijk
OBJECTIVE: To investigate the association between maternal vascular murmurs (MVMs) and fetal growth restriction (defined as small-for-gestational-age [SGA] fetus) and abnormal Doppler pulsatility index (PI) of the uterine and/or umbilical arteries. METHODS: A cross-sectional study of women aged 18 years or older with a singleton pregnancy at 28-34 weeks was conducted at Regional Hospital Viborg, Denmark, between May 1 and August 1, 2013. Ultrasound fetal biometry was performed and the Doppler PI of the umbilical and uterine arteries was determined...
July 18, 2017: International Journal of Gynaecology and Obstetrics
https://www.readbyqxmd.com/read/28708246/three-dimensional-power-doppler-evaluation-of-cerebral-vascular-blood-flow-a-novel-tool-in-the-assessment-of-fetal-growth-restriction
#12
Katherine R Goetzinger, Alison G Cahill, Linda Odibo, George A Macones, Anthony O Odibo
OBJECTIVES: To determine whether fetuses with fetal growth restriction (FGR) are more likely to have abnormal cerebral vascular flow patterns compared to fetuses who are appropriate for gestational age (AGA) when quantified by using 3-dimensional (3D) power Doppler ultrasound. METHODS: We conducted a prospective cohort study of singleton gestations presenting for growth ultrasound examination between 24 and 36 weeks' gestation. Patients with FGR (estimated fetal weight < 10th percentile) were enrolled and matched 1:1 for gestational age (±7 days) with AGA fetuses...
July 14, 2017: Journal of Ultrasound in Medicine: Official Journal of the American Institute of Ultrasound in Medicine
https://www.readbyqxmd.com/read/28700818/fetal-mca-doppler-to-time-intrauterine-transfusions-in-red-cell-alloimmunisation-a-randomised-trial
#13
Jodie M Dodd, Chad Andersen, Jan E Dickinson, Jennie Louise, Andrea Deussen, Rosalie M Grivell, Liliana Voto, Mark D Kilby, Rory Windrim, Greg Ryan
OBJECTIVES: Red cell alloimmunisation affects up to 0.6% of all live births, and can be successfully treated with intrauterine fetal blood transfusion. Fetal middle cerebral artery (MCA) Doppler peak systolic velocity (PSV) is a non-invasive test, to identify fetal anaemia and requiring intrauterine transfusion (IUT). Traditionally, timing of subsequent IUTs has involved estimating a fall in fetal haematocrit of 1% per day, or a fall in fetal haemoglobin of 0.3 g/dL per day. The aim of this pragmatic multi-centre randomised trial was to evaluate whether Doppler MCA-PSV in the fetus that has undergone one IUT for anaemia secondary to red cell alloimmunisation was non-inferior to timing IUT by timing based on predicting the fall in fetal haematocrit or fetal haemoglobin, without compromising infant haemoglobin at birth...
July 12, 2017: Ultrasound in Obstetrics & Gynecology
https://www.readbyqxmd.com/read/28679680/chronic-hypoxia-alters-maternal-uterine-and-fetal-hemodynamics-in-the-term-pregnant-guinea-pig
#14
Shifa Turan, Graham W Aberdeen, Loren P Thompson
Placental hypoxia is associated with maternal hypertension, placental insufficiency and fetal growth restriction. In the pregnant guinea pig, prenatal hypoxia during early gestation inhibits cytotrophoblast invasion of spiral arteries, increases maternal blood pressure and induces fetal growth restriction. This study evaluated the impact of chronic maternal hypoxia on fetal heart structure with 4D echocardiography with spatio-temporal image correlation and tomographic ultrasound (STIC-TUI) and uterine and umbilical artery resistance/pulsatility indices and fetal heart function using pulsed wave Doppler ultrasound...
July 5, 2017: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/28660654/teleultrasound-how-accurate-are-we
#15
Nader Z Rabie, Adam T Sandlin, Kevin A Barber, Songthip Ounpraseuth, Wendy Nembhard, Everett F Magann, Curtis Lowery
OBJECTIVES: Ultrasound serves an important role in the prenatal diagnosis of fetal structural anomalies. Recently, there has been increased use of teleultrasound protocols. We aimed to evaluate the sensitivity and accuracy of teleultrasound. METHODS: We conducted an Institutional Review Board-approved retrospective cohort study determining the sensitivity and accuracy of teleultrasound. In addition, we evaluated the number of ultrasound examinations required to complete an anatomic survey...
June 29, 2017: Journal of Ultrasound in Medicine: Official Journal of the American Institute of Ultrasound in Medicine
https://www.readbyqxmd.com/read/28651459/-examination-of-placental-three-dimensional-power-doppler-indices-and-perinatal-outcome-in-pregnancies-complicated-by-intrauterine-growth-restriction
#16
András Molnár, Andrea Surányi, Mária Jakó, Tibor Nyári, Gábor Németh
INTRODUCTION: Development of intrauterine growth restriction (IUGR) can be traced back to maternal or fetal factors, but in many cases we find placental factors (reduced placental circulation) in the background. AIM: Our aim was to examine whether the reduced placental bloodperfusion and vascularity show any correlation with cesarean section frequency and the clinical outcome in IUGR pregnancies. The aim of the present study was also to use a properly calibrated and reproducible method for evaluating placental blood flow, that can later be incorporated into the routine examination...
July 2017: Orvosi Hetilap
https://www.readbyqxmd.com/read/28643667/can-we-perform-a-prenatal-diagnosis-of-vasa-previa-to-improve-its-obstetrical-and-neonatal-outcomes
#17
E Nohuz, E Boulay, D Gallot, D Lemery, F Vendittelli
INTRODUCTION: Vasa previa (VP) is defined as a condition in which the fetal blood vessels, unsupported by the placenta or the umbilical cord, run through the membranes of the lower uterine segment. It is associated with a high risk of stillbirth by exsanguination. This study aimed to assess the clinical context of diagnosis of VP in order to elaborate a strategy for its prenatal diagnosis and to improve its obstetrical and neonatal outcomes. MATERIAL AND METHODS: This historical cohort study covered the period from January 1, 2011 to December 31, 2015...
April 2017: Journal of gynecology obstetrics and human reproduction
https://www.readbyqxmd.com/read/28637734/pregnancy-specific-stress-fetoplacental-haemodynamics-and-neonatal-outcomes-in-women-with-small-for-gestational-age-pregnancies-a-secondary-analysis-of-the-multicentre-prospective-observational-trial-to-optimise-paediatric-health-in-intrauterine-growth-restriction
#18
Terri A Levine, Ruth E Grunau, Ricardo Segurado, Sean Daly, Michael P Geary, Mairead M Kennelly, Keelin O'Donoghue, Alyson Hunter, John J Morrison, Gerard Burke, Patrick Dicker, Elizabeth C Tully, Fergal D Malone, Fiona A Alderdice, Fionnuala M McAuliffe
OBJECTIVES: To examine associations between maternal pregnancy-specific stress and umbilical (UA PI) and middle cerebral artery pulsatility indices (MCA PI), cerebroplacental ratio, absent end diastolic flow (AEDF), birthweight, prematurity, neonatal intensive care unit admission and adverse obstetric outcomes in women with small for gestational age pregnancies. It was hypothesised that maternal pregnancy-specific stress would be associated with fetoplacental haemodynamics and neonatal outcomes...
June 21, 2017: BMJ Open
https://www.readbyqxmd.com/read/28635180/renal-vascularization-indexes-and-fetal-hemodynamics-in-fetuses-with-growth-restriction
#19
Giovana Farina Doro, Janaína Campos Senra, Agatha Sacramento Rodrigues, Seizo Miyadahira, Renata Lopes Ribeiro, Rossana Pulcinelli Vieira Francisco, Lisandra Stein Bernardes
OBJECTIVE: To identify the correlation between the renal vascularization index (VI), the flow index (FI) and the vascularization and flow index (VFI) and placental and fetal hemodynamics in fetuses with growth restriction. METHOD: Bidimensional ultrasound and three-dimensional power Doppler with the VOCAL technique were used to determine the renal vascular indexes and fetal and placental hemodynamics in fetuses below the 10th percentile for fetal weight. Partial correlation analysis (controlled for renal depth and gestational age) was performed...
June 20, 2017: Prenatal Diagnosis
https://www.readbyqxmd.com/read/28619771/revealed-versus-concealed-criteria-for-placental-insufficiency-in-an-unselected-obstetric-population-in-late-pregnancy-ratio37-randomised-controlled-trial-study-protocol
#20
Francesc Figueras, Eduard Gratacos, Marta Rial, Ilan Gull, Ladislav Krofta, Marek Lubusky, Rogelio Cruz-Martinez, Mónica Cruz-Lemini, Miguel Martinez-Rodriguez, Pamela Socias, Cristina Aleuanlli, Mauro C Parra Cordero
INTRODUCTION: Fetal growth restriction (FGR) affects 5%-10% of all pregnancies, contributing to 30%-50% of stillbirths. Unfortunately, growth restriction often is not detected antenatally. The last weeks of pregnancy are critical for preventing stillbirth among babies with FGR because there is a pronounced increase in stillbirths among growth-restricted fetuses after 37 weeks of pregnancy. Here we present a protocol (V.1, 23 May 2016) for the RATIO37 trial, which evaluates an integrated strategy for accurately selecting at-risk fetuses for delivery at term...
June 15, 2017: BMJ Open
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