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Doppler velocimetry

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https://www.readbyqxmd.com/read/28729313/fetal-doppler-velocimetry-and-bronchopulmonary-dysplasia-risk-among-growth-restricted-preterm-infants-an-observational-study
#1
Alessandra Lio, Paolo Rosati, Roberta Pastorino, Francesco Cota, Milena Tana, Chiara Tirone, Claudia Aurilia, Cinzia Ricci, Alessandro Gambacorta, Angela Paladini, Ilenia Mappa, Silvia Buongiorno, Gian Franco Zannoni, Costantino Romagnoli, Giovanni Vento
OBJECTIVE: To investigate whether fetal growth restriction (FGR) diagnosis, based on pathological prenatal fetal Doppler velocimetry, is associated with bronchopulmonary dysplasia (BPD) independently of being small for gestational age (SGA) per se at birth among very preterm infants. DESIGN: Prospective, observational study. FGR was defined as failing fetal growth in utero and fetal Doppler velocimetry abnormalities. SETTING: Policlinico Universitario Agostino Gemelli, Roma, Italy...
July 20, 2017: BMJ Open
https://www.readbyqxmd.com/read/28685832/assessment-of-genotoxicity-and-biodistribution-of-nano-and-micron-sized-yttrium-oxide-in-rats-after-acute-oral-treatment
#2
Archana Panyala, Srinivas Chinde, Srinivas Indu Kumari, Paramjit Grover
The increasing use of yttrium oxide (Y2 O3 ) nanoparticles (NPs) entails an improved understanding of their potential impact on the environmental and human health. In the present study, the acute oral toxicity of Y2 O3 NPs and their microparticles (MPs) was carried out in female albino Wistar rats with 250, 500 and 1000 mg kg(-1) body weight doses. Before the genotoxicity evaluation, characterization of the particles by transmission electron microscopy, dynamic light scattering and laser Doppler velocimetry was performed...
July 7, 2017: Journal of Applied Toxicology: JAT
https://www.readbyqxmd.com/read/28671872/camera-based-assessment-of-arterial-stiffness-and-wave-reflection-parameters-from-neck-micro-motion
#3
Andreia Vieira Moço, Luis Albert Zavala Mondragon, Wenjin Wang, Sander Stuijk, Gerard de Haan
The feasibility of camera-based extraction of the carotid distension waveforms offers the prospect of a user-friendly alternative to Laser Doppler Velocimetry (LDV) or accelerometry-based systems. Upon supplementary calibration of vessel wall displacement to arterial pressure, our system may also be an appealing alternative to applanation tonometry for extracting cardiac-related features from the central pulse pressure waveform. This paper describes the application of camera-based micro-motion imaging to extract health-related features from the contour of the carotid displacement waveform...
July 3, 2017: Physiological Measurement
https://www.readbyqxmd.com/read/28661910/determination-of-reynolds-shear-stress-level-for-hemolysis
#4
Choon-Sik Jhun, Megan A Stauffer, John D Reibson, Eric E Yeager, Raymond K Newswanger, Joshua O Taylor, Keefe B Manning, William J Weiss, Gerson Rosenberg
Reynolds shear stress (RSS) has served as a metric for the effect of turbulence on hemolysis. Forstrom (1969) and Sallam and Hwang (1984) determined the RSS threshold for hemolysis to be 50,000 and 4,000 dyne/cm, respectively, using a turbulent jet. Despite the order of magnitude discrepancy, the threshold by Sallam and Hwang has been frequently cited for hemolytic potential in blood pumps. We recreated Sallam apparatus (SA) to resolve this discrepancy and provide additional data to be used in developing a more accurate hemolysis model...
June 15, 2017: ASAIO Journal: a Peer-reviewed Journal of the American Society for Artificial Internal Organs
https://www.readbyqxmd.com/read/28627012/effect-of-betamethasone-on-fetal-pulmonary-and-umbilical-artery-doppler-velocimetry-and-relationship-with-respiratory-distress-syndrome-development
#5
Emre Sinan Güngör, Gülşah İlhan, Hüseyin Gültekin, Ali Galip Zebitay, Serdar Cömert, Fatma Ferda Verit
OBJECTIVES: Respiratory distress syndrome (RDS) is a major cause of neonatal morbidity and mortality. It is primarily a disease of premature neonates. The aim of this study was to evaluate the impact of maternal betamethasone administration on the fetal pulmonary arteries (PAs) and umbilical arteries (UAs) and the correlation between RDS development and PA Doppler results. METHODS: Forty singleton pregnancies between 24 and 34 gestational weeks with a diagnosis of preterm birth were included prospectively...
June 19, 2017: Journal of Ultrasound in Medicine: Official Journal of the American Institute of Ultrasound in Medicine
https://www.readbyqxmd.com/read/28622824/toxicological-assessment-of-nano-and-micron-sized-tungsten-oxide-after-28days-repeated-oral-administration-to-wistar-rats
#6
Srinivas Chinde, Paramjit Grover
Tungsten oxide (WO3) nanoparticles (NPs) are being used in various applications. However, the health consequences of WO3 NPs exposure have not been explored extensively. Hence, the goal of this study was to evaluate the toxicity of WO3 NPs and their microparticles (MPs) after 28days repeated oral administration in Wistar rats. The particles were characterised by transmission electron microscopy (TEM), dynamic light scattering (DLS), laser Doppler velocimetry (LDV), Brunner-Emmett-Teller (BET), X- ray diffraction (XRD), and inductively coupled plasma optical emission spectrometer (ICP-OES)...
July 2017: Mutation Research
https://www.readbyqxmd.com/read/28612673/can-flavonoid-rich-chocolate-modulate-arterial-elasticity-and-pathological-uterine-artery-doppler-blood-flow-in-pregnant-women-a-pilot-study
#7
Emma von Wowern, Per Olofsson
INTRODUCTION: Dark chocolate has shown beneficial effects on cardiovascular health and might also modulate hypertensive complications in pregnancy and uteroplacental blood flow. Increased uteroplacental resistance is associated with systemic arterial stiffness. We aimed to investigate the short-term effect of flavonoid-rich chocolate on arterial stiffness and Doppler blood flow velocimetry indexes in pregnant women with compromised uteroplacental blood flow. METHODS: Doppler blood flow velocimetry and digital pulse wave analysis (DPA) were performed in 25 women pregnant in the second and third trimesters with uterine artery (UtA) score (UAS) 3-4, before and after 3 days of ingestion of chocolate with high flavonoid and antioxidant contents...
June 14, 2017: Journal of Maternal-fetal & Neonatal Medicine
https://www.readbyqxmd.com/read/28611933/monochorionic-triamniotic-triplet-pregnancy-complicated-by-twin-reversed-arterial-perfusion-sequence-case-report-and-literature-review
#8
Pingshan Pan, Guoyang Luo, Lu Tang, Jeanne D Rolle, Yuqin Qin, Quan Zeng, Jiangting Wei, Yuanfang Chen, Hongwei Wei
Background  Monochorionic-triamniotic pregnancies are rare and fraught with complications. Case  A case of monochorionic-triamniotic triplet pregnancy complicated by twin reversed arterial perfusion (TRAP) sequence is presented. The patient declined termination or selective fetal reduction. Triplet C was acardiac. At 24 weeks, triplet B developed polyhydramnios. At 30 weeks, polyhydramnios was seen in all three amniotic sacs, but without signs of fetal hydrops and with normal Doppler velocimetry measurements in the umbilical artery, middle cerebral artery, and ductus arteriosus of triplets A and B...
April 2017: American Journal of Perinatology Reports
https://www.readbyqxmd.com/read/28608175/reliability-and-validity-of-clinical-tests-to-assess-the-anatomical-integrity-of-the-cervical-spine-in-adults-with-neck-pain-and-its-associated-disorders-part-1-a-systematic-review-from-the-cervical-assessment-and-diagnosis-research-evaluation-cadre-collaboration
#9
REVIEW
Nadège Lemeunier, S da Silva-Oolup, N Chow, D Southerst, L Carroll, J J Wong, H Shearer, P Mastragostino, J Cox, E Côté, K Murnaghan, D Sutton, P Côté
OBJECTIVE: To determine the reliability and validity of clinical tests to assess the anatomical integrity of the cervical spine in adults with neck pain and its associated disorders. METHODS: We updated the systematic review of the 2000-2010 Bone and Joint Decade Task Force on Neck Pain and its Associated Disorders. We also searched the literature to identify studies on the reliability and validity of Doppler velocimetry for the evaluation of cervical arteries. Two independent reviewers screened and critically appraised studies...
June 12, 2017: European Spine Journal
https://www.readbyqxmd.com/read/28591361/doppler-velocimetry-in-fetal-rats-exposed-to-enoxaparin-and-unfractionated-heparin-ufh-during-pregnancy
#10
Flavio Renato de Almeida Senefonte, Ricardo Dutra Aydos, Vanessa Marcon de Oliveira, Marco Antonio Costa Bósio, Ernesto Antonio Figueiró-Filho
Purpose: To evaluate the effects of enoxaparin and unfractionated heparin (UFH) administered in prophylactic and therapeutic doses on fetal vessels in healthy pregnant Wistar rats, according to Doppler velocimetry measurements. Methods: Fifty animals were assigned to one of five groups: controls (saline), prophylactic and therapeutic enoxaparin (1 and 2 mg/kg/day, respectively), and prophylactic and therapeutic UFH (72 and 400 UI/kg/day, respectively). Uterine horns were examined by ultrasound for identification of live fetuses...
May 2017: Acta Cirúrgica Brasileira
https://www.readbyqxmd.com/read/28591340/uterine-artery-doppler-flow-velocimetry-parameters-for-predicting-gestational-trophoblastic-neoplasia-after-complete-hydatidiform-mole-a-prospective-cohort-study
#11
Flavia Tarabini Castellani Asmar, Antonio Rodrigues Braga-Neto, Jorge de Rezende-Filho, Juliana Marques Simões Villas-Boas, Rafael Cortés Charry, Izildinha Maesta
OBJECTIVES: Doppler ultrasonography can be used to assess neoangiogenesis, a characteristic feature of postmolar gestational trophoblastic neoplasia. However, there is limited information on whether uterine artery Doppler flow velocimetry parameters can predict gestational trophoblastic neoplasia following a complete hydatidiform mole. The purpose of this study was as follows: 1) to compare uterine blood flow before and after complete mole evacuation between women who developed postmolar gestational trophoblastic neoplasia and those who achieved spontaneous remission, 2) to assess the usefulness of uterine Doppler parameters as predictors of postmolar gestational trophoblastic neoplasia and to determine the best parameters and cutoff values for predicting postmolar gestational trophoblastic neoplasia...
May 2017: Clinics
https://www.readbyqxmd.com/read/28586913/repeatability-and-reproducibility-of-retinal-blood-flow-measurement-using-a-doppler-optical-coherence-tomography-flowmeter-in-healthy-subjects
#12
Tomofumi Tani, Young-Seok Song, Takafumi Yoshioka, Tsuneaki Omae, Akihiro Ishibazawa, Masahiro Akiba, Akitoshi Yoshida
Purpose: To evaluate the repeatability and reproducibility of retinal blood flow (RBF) measurements in humans by using new auto-alignment and measurement software in a commercially available Doppler optical coherence tomography (DOCT) system. Methods: The DOCT flowmeter assessed the intrasession repeatability and the intersession and interobserver reproducibility of the RBF measurements. For intrasession repeatability, the coefficients of variation (CVs) of five repeated RBF measurements were calculated at the retinal arteries and veins in 20 normal eyes of 20 healthy volunteers...
June 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28567580/review-of-experimental-modelling-in-vascular-access-for-hemodialysis
#13
REVIEW
S Drost, N Alam, J G Houston, D Newport
This paper reviews applications of experimental modelling in vascular access for hemodialysis. Different techniques that are used in in-vitro experiments are bulk pressure and flow rate measurements, Laser Doppler Velocimetry and Vector Doppler Ultrasound point velocity measurements, and whole-field measurements such as Particle Image Velocimetry, Ultrasound Imaging Velocimetry, Colour Doppler Ultrasound, and Planar Laser Induced Fluorescence. Of these methods, the ultrasound techniques can also be used in-vivo, to provide realistic boundary conditions to in-vitro experiments or numerical simulations...
May 31, 2017: Cardiovascular Engineering and Technology
https://www.readbyqxmd.com/read/28457816/interventions-to-prevent-stillbirth
#14
REVIEW
Jessica M Page, Robert M Silver
Stillbirth is one of the most distressing complications of pregnancy and still occurs far too frequently. The rate of stillbirth has been decreasing worldwide but room for improvement remains even in high-income countries. Risk factors for stillbirth have been identified in an effort to detect those women at increased risk. However, risk factors are non-specific and do not identify most stillbirths. Strategies employed to screen the general population such as assessment of fetal activity, fetal growth screening and biomarkers have also been used to identify increased risk for stillbirth...
June 2017: Seminars in Fetal & Neonatal Medicine
https://www.readbyqxmd.com/read/28456262/nonmechanical-compact-probe-for-cross-sectional-velocity-measurement-based-on-differential-laser-doppler-velocimetry
#15
K Maru, S Katsumi, R Matsuda
In this study, we propose and demonstrate a nonmechanical compact probe for cross-sectional velocity measurement based on differential laser Doppler velocimetry. The system introduces a method that combines simultaneous multipoint measurement using spatial encoding and nonmechanical scanning of measurement points, in which spatially encoded measurement points aligned along the transverse direction are scanned in the axial direction by changing the wavelength. The use of a waveguide-type LiNbO3 phase shifter array for serrodyne frequency shifting is feasible for the system based on fiber optics with an easily handled probe...
April 2017: Review of Scientific Instruments
https://www.readbyqxmd.com/read/28430305/turbulence-measurements-in-an-axial-rotary-blood-pump-with-laser-doppler-velocimetry
#16
Chan Y Schüle, Klaus Affeld, Max Kossatz, Christian O Paschereit, Ulrich Kertzscher
BACKGROUND: The implantation of rotary blood pumps as ventricular assist devices (VADs) has become a viable therapy for quite a number of patients with end-stage heart failure. However, these rotary blood pumps cause adverse events that are related to blood trauma. It is currently believed that turbulence in the pump flow plays a significant role. But turbulence has not been measured to date because there is no optical access to the flow space in rotary blood pumps because of their opaque casings...
April 18, 2017: International Journal of Artificial Organs
https://www.readbyqxmd.com/read/28428653/doppler-velocimetry-of-the-orbital-arteries-in-patients-with-sickle-cell-anemia-relationship-with-biomarkers-of-hemolysis
#17
Thiago de Oliveira Ferrão, Paulo Ricardo Martins-Filho, Cleverton Aragão, Marlyson Santana, Allan Nascimento, Thayane Cardoso, Rosana Cipolotti
OBJECTIVE: To investigate orbital vascular resistance by Doppler velocimetry in patients with steady-state sickle cell anemia, as well as to characterize its relationship with biomarkers of hemolysis. MATERIALS AND METHODS: This was a cross-sectional study of two groups: 71 outpatients with sickle cell anemia; and 32 age- and gendermatched, healthy subjects (control group). All participants underwent Doppler velocimetry of the orbital arteries and laboratory tests...
March 2017: Radiologia Brasileira
https://www.readbyqxmd.com/read/28426506/applications-of-noninvasive-hemodynamic-monitoring-in-obstetric-management
#18
John T Sullivan
Clinicians managing obstetric patients are dependent on valid hemodynamic measurements to guide care. Heart rate and noninvasive blood pressure guide most current care. New hemodynamic monitors are being used to report research findings and are being investigated by clinicians for their value to supplement standard monitoring. These include arterial pulse contour analysis, Doppler velocimetry, and bioimpedance among others. This chapter serves to present these new devices with a critical review of their advantages and limitations, and most importantly the validity of their measurements...
June 2017: Clinical Obstetrics and Gynecology
https://www.readbyqxmd.com/read/28416375/automatic-and-manual-doppler-velocimetry-measurements-of-the-uterine-artery-in-pregnant-ewes
#19
Renato Travassos Beltrame, Lucas Buss Littig, Carolina Covre, Amanda de Barros Martins, Celia Raquel Quirino, R L D Costa
We aimed to compare measurements of speed and blood flow parameters obtained manually and automatically in the uterine arteries of pregnant ewes. Eighteen Santa Inês ewes, confirmed to be pregnant, were followed every 2 weeks until parturition. The systolic peak (PS), end diastolic velocity (ED), maximum and average speed in the cardiac cycle (TAMAX and TAMEAN, respectively), pulsatility index (PI), resistance index (RI) and the systole/diastole (S/D) ratio and body flow volume (BFV) was measured. We began the wave evaluation automatically, then the observer manually marked the beginning and end of the wave...
March 31, 2017: Animal Reproduction Science
https://www.readbyqxmd.com/read/28395328/cystic-endometrial-hyperplasia-pyometra-syndrome-in-bitches-identification-of-hemodynamic-inflammatory-and-cell-proliferation-changes
#20
Gisele Almeida Lima Veiga, Ricardo Henrique Miziara, Daniel Souza Ramos Angrimani, Paula Carvalho Papa, Bruno Cogliati, Camila Infantosi Vannucchi
Cystic endometrial hyperplasia (CEH)-pyometra syndrome is one of the most common diseases of noncastrated female dogs. However, determination of etiological mechanisms and differential diagnosis of CEH-pyometra syndrome are undefined. The aim of this study is to compare immunohistochemically the expression of cyclooxygenase-2 (COX-2) inflammatory mediator, Ki-67 antigen proliferation marker, vascular endothelial growth factor (VEGF-A) angiogenesis mediator and its FLT-1 and KDR receptors, and correlate with Doppler velocimetry of uterine artery and endometrial vascularization in bitches with CEH-pyometra syndrome...
January 1, 2017: Biology of Reproduction
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