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Doppler velocimetry

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https://www.readbyqxmd.com/read/29110317/fetal-growth-standards-in-gastroschisis-reference-values-for-ultrasound-measurements
#1
Mariane Massaini Barbieri, João Renato Bennini, Marcelo Luís Nomura, Sirlei Siani Morais, Fernanda Garanhani Surita
OBJECTIVES: To create growth curves based on ultrasonography biometric parameters of fetuses with gastroschisis, comparing them with normal growth standards and to analyze umbilical artery (AU) Doppler velocimetry patterns. METHODS: A cohort study of 72 fetuses with gastroschisis, at gestational ages between 14 and 39 weeks was designed. Mean and standard deviation were calculated, with the 5th, 10th, 50th, 90th and 95th centiles being established for biometric parameters according to gestational age...
November 7, 2017: Prenatal Diagnosis
https://www.readbyqxmd.com/read/29102503/maternal-hemodynamics-a-method-to-classify-hypertensive-disorders-of-pregnancy
#2
Enrico Ferrazzi, Tamara Stampalija, Lorenzo Monasta, Daniela Di Martino, Sharona Vonck, Wilfried Gyselaers
BACKGROUND: The classification of hypertensive disorders of pregnancy (HDP) is based on the time at the onset of hypertension, proteinuria, and other associated complications. Maternal hemodynamic interrogation in HDP considers not only the peripheral blood pressure but also the entire cardiovascular system, and it might help to classify the different clinical phenotypes of this syndrome. OBJECTIVES: This study aimed to examine cardiovascular parameters in a cohort of patients affected by HDP according to the clinical phenotypes that prioritize fetoplacental characteristics and not the time at onset of HDP...
November 1, 2017: American Journal of Obstetrics and Gynecology
https://www.readbyqxmd.com/read/29019748/doppler-us-in-the-evaluation-of-fetal-growth-and-perinatal-health
#3
Kristen R Uquillas, Brendan H Grubbs, Ashley E Prosper, Ramen H Chmait, Edward G Grant, Daphne K Walker
Fetal growth restriction is commonly defined as an estimated fetal weight (EFW) that is below the 10th percentile for gestational age. It is associated with an increased risk of intrauterine demise, neonatal morbidity, and neonatal death; therefore, antenatal detection and surveillance with the optimization of delivery timing are necessary to improve pregnancy outcomes. If the estimated due date has been verified and the EFW is below the 10th percentile for gestational age, the underlying cause should be investigated, since the clinical management, outcome, and counseling options are largely dependent on the cause of the growth restriction...
October 2017: Radiographics: a Review Publication of the Radiological Society of North America, Inc
https://www.readbyqxmd.com/read/28983564/effect-of-circulating-omentin-1-on-the-retinal-circulation-in-patients-with-type-2-diabetes-mellitus
#4
Tsuneaki Omae, Taiji Nagaoka, Akitoshi Yoshida
Purpose: To identify any significant correlations between retinal circulatory parameters and serum concentrations of omentin-1, a novel adipokine produced by adipocytes, in patients suffering from type 2 diabetes mellitus. Methods: Eighty-seven patients suffering from type 2 diabetes and incipient diabetic retinopathy (DR) were analyzed and further divided into two groups according to sex. We compared the patients' retinal circulatory parameters measured with laser Doppler velocimetry and serum omentin-1 concentrations...
October 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28957175/capillary-red-blood-cell-velocimetry-by-phase-resolved-optical-coherence-tomography
#5
Jianbo Tang, Sefik Evren Erdener, Buyin Fu, David A Boas
We present a phase-resolved optical coherence tomography (OCT) method to extend Doppler OCT for the accurate measurement of the red blood cell (RBC) velocity in cerebral capillaries. OCT data were acquired with an M-mode scanning strategy (repeated A-scans) to account for the single-file passage of RBCs in a capillary, which were then high-pass filtered to remove the stationary component of the signal to ensure an accurate measurement of phase shift of flowing RBCs. The angular frequency of the signal from flowing RBCs was then quantified from the dynamic component of the signal and used to calculate the axial speed of flowing RBCs in capillaries...
October 1, 2017: Optics Letters
https://www.readbyqxmd.com/read/28948358/pregnancy-outcome-in-162-women-with-rheumatic-diseases-experience-of-a-university-hospital-in-turkey
#6
Ebru Alici Davutoğlu, Aysegul Ozel, Nevin Yılmaz, Riza Madazli
PURPOSE: To evaluate the distribution and the obstetric outcomes of pregnancies with different types of rheumatic diseases managed in our unit. METHODS: Pregnancies of 162 women with rheumatic diseases, seen for their antenatal care at our department for the period between 2013 and 2017 were included in this retrospective clinical study. Obstetric and perinatal outcomes were main outcome measures. RESULTS: The most encountered rheumatic diseases were SLE (37...
December 2017: Archives of Gynecology and Obstetrics
https://www.readbyqxmd.com/read/28940586/comparative-instrumental-evaluation-of-efficacy-and-safety-between-a-binary-and-a-ternary-system-in-chemexfoliation
#7
Norma Cameli, Maria Mariano, Marco Ardigò, Cristina Corato, Gianfranco De Paoli, Enzo Berardesca
OBJECTIVE: To instrumentally evaluate the efficacy and the safety of a new ternary system chemo exfoliating formulation (water-dimethyl isosorbide-acid) vs traditional binary systems (water and acid) where the acid is maintained in both the systems at the same concentration. METHODS: Different peelings (binary system pyruvic acid and trichloroacetic acid-TCA, and ternary system pyruvic acid and TCA) were tested on the volar forearm of 20 volunteers of both sexes between 28 and 50 years old...
September 20, 2017: Journal of Cosmetic Dermatology
https://www.readbyqxmd.com/read/28926826/a-low-cerebroplacental-ratio-at-20-24-weeks-of-gestation-can-predict-reduced-fetal-size-later-in-pregnancy-or-at-birth
#8
Edgar Hernandez-Andrade, Eli Maymon, Offer Erez, Homam Saker, Suchaya Luewan, Maynor Garcia, Hyunyoung Ahn, Adi L Tarca, Bogdan Done, Steven J Korzeniewski, Sonia S Hassan, Roberto Romero
AIM: To determine whether Doppler evaluation at 20-24 weeks of gestation can predict reduced fetal size later in pregnancy or at birth. METHODS: Fetal biometry and Doppler velocimetry were performed in 2,986 women with a singleton pregnancy at 20-24 weeks of gestation. Predictive performances of the umbilical artery pulsatility index (UA-PI) or the mean uterine artery pulsatility index (UtA-PI) >95th percentile, middle cerebral artery pulsatility index, or cerebroplacental ratio (CPR) <5th percentile for early small for gestational age (SGA; <34 weeks of gestation), late SGA (≥34 weeks of gestation), or SGA at birth (birthweight <10th percentile) were analyzed...
September 20, 2017: Fetal Diagnosis and Therapy
https://www.readbyqxmd.com/read/28914371/serum-cystatin-c-is-associated-with-kidney-function-but-not-with-cardiovascular-risk-factors-or-subclinical-atherosclerosis-in-patients-with-systemic-lupus-erythematosus
#9
Patricia Garcia-Garcia, Raquel Castejon, Pablo Tutor-Ureta, R A Silvestre, Susana Mellor-Pita, Carlos Jimenez-Ortiz, Miguel Yebra-Bango
Cystatin C (CysC) is a protein considered as an excellent marker of renal function, and it has been suggested as an independent predictor of cardiovascular (CV) risk. We evaluated the association of serum CysC with renal function, CV risk factors, inflammation, and subclinical atherosclerosis in Systemic Lupus Erythematosus (SLE) patients. Sixty-one SLE female patients were selected according to estimated glomerular filtration rate (GFR) > 60 ml/min/1.73m(2). Renal function parameters, SLE specific factors, CV risk factors, and inflammatory markers were assessed...
December 2017: Clinical Rheumatology
https://www.readbyqxmd.com/read/28894946/an-international-survey-on-non-invasive-techniques-to-assess-the-microcirculation-in-patients-with-raynaud-s-phenomenon-sunshine-survey
#10
Francesca Ingegnoli, Nicola Ughi, Graham Dinsdale, Annalisa Orenti, Patrizia Boracchi, Yannick Allanore, Ivan Foeldvari, Alberto Sulli, Maurizio Cutolo, Vanessa Smith, Ariane L Herrick
To canvas opinion concerning the role of non-invasive techniques in the assessment of patients with Raynaud's phenomenon (Rp) in clinical and research settings: four nailfold capillaroscopy methods [videocapillaroscopy (NVC), dermoscopy, stereomicroscopy, digital USB microscopy], four laser Doppler methods (laser Doppler flowmetry, imaging, anemometry/velocimetry, laser speckle contrast analysis), thermographic imaging, and upper limb arterial Doppler ultrasound. Emails with a link to the survey were sent to physicians from the European Scleroderma Trials and Research group (EUSTAR), the EULAR Study Group on Microcirculation in Rheumatic Diseases (SG_MC/RD) and members of the pediatric rheumatology Email board...
November 2017: Rheumatology International
https://www.readbyqxmd.com/read/28892981/effect-of-transdermal-nitroglycerine-on-doppler-velocity-waveforms-of-the-uterine-umbilical-and-fetal-middle-cerebral-arteries-in-patients-with-chronic-placental-insufficiency-a-prospective-rct
#11
Suruchi Gupta, Meenakshi Chauhan, Jyotsna Sen, Smiti Nanda
INTRODUCTION: Increase in Nitric Oxide (NO) may be important in vascular adaptation needed to accommodate increased uteroplacental blood flow as pregnancy advances. Hence, in certain conditions like Pregnancy Induced Hypertension (PIH) and Fetal Growth Restriction (FGR), NO donors may play an effective role in increasing uteroplacental perfusion. Transdermal route appears to be a safe and effective route. AIM: To evaluate the effect of nitroglycerine patch on Doppler velocity waveforms of the uterine, umbilical and fetal middle cerebral arteries in patients with chronic placental insufficiency...
July 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28890304/hemodynamic-parameters-that-may-predict-false-lumen-growth-in-type-b-aortic-dissection-after-endovascular-repair-a-preliminary-study-on-long-term-multiple-follow-ups
#12
Huanming Xu, Zhenfeng Li, Huiwu Dong, Yilun Zhang, Jianyong Wei, Paul N Watton, Wei Guo, Duanduan Chen, Jiang Xiong
Thoracic endovascular aortic repair (TEVAR) is commonly applied in type-B aortic dissection. For patients with dissection affects descending aorta and extends downward to involve abdominal aorta and possibly iliac arteries, false lumen (FL) expansion might occur post-TEVAR. Predictions of dissection development may assist in medical decision on re-intervention or surgery. In this study, two patients are selected with similar morphological features at initial presentation but with different long-term FL development post-TEVAR (stable and enlarged FL)...
December 2017: Medical Engineering & Physics
https://www.readbyqxmd.com/read/28845496/can-fetal-adrenal-artery-doppler-velocimetry-predict-delivery-date-in-pregnant-women-with-spontaneous-preterm-birth
#13
Francisco Herlânio Costa Carvalho, Aline Pinto Lemos, Francisco Edson De Lucena Feitosa, Helvécio Neves Feitosa, Lucas Costa Carvalho Augusto, Rosa Maria Salani Mota, Edward Araujo Júnior
AIM: To assess the accuracy of delivery date predictions made using fetal adrenal artery Doppler velocimetry in pregnant women with spontaneous preterm birth (PB) and to compare these predictions with cervical length (CL) measurements.Material and methods: A prospective study was performed with 51 pregnant women whose gestational lengths were between 24 and 36 weeks. The main outcome was the time between the Doppler velocimetry examination and delivery, categorized as delivery within 7 days or 7 days later after the examination...
February 8, 2017: Medical Ultrasonography
https://www.readbyqxmd.com/read/28783853/uterine-artery-doppler-velocimetry-of-uterine-leiomyomas-in-nigerian-women
#14
Bukunmi Michael Idowu, Bolanle Olubunmi Ibitoye, Victor Adebayo Adetiloye
Objective To describe the blood flow velocities and impedance indices changes in the uterine arteries of leiomyomatous uteri using Doppler sonography. Methods This was a prospective, case-control study conducted on 140 premenopausal women with sonographic diagnosis of uterine leiomyoma and 140 premenopausal controls without leiomyomas. Pelvic sonography was performed to diagnose and characterize the leiomyomas. The hemodynamics of the ascending branches of both main uterine arteries was assessed by Doppler interrogation...
September 2017: Revista Brasileira de Ginecologia e Obstetrícia
https://www.readbyqxmd.com/read/28729313/fetal-doppler-velocimetry-and-bronchopulmonary-dysplasia-risk-among-growth-restricted-preterm-infants-an-observational-study
#15
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
#16
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
#17
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
#18
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
#19
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
#20
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
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