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Doppler ultrasound

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https://www.readbyqxmd.com/read/29470857/numerical-study-on-the-hemodynamics-of-patient-specific-carotid-bifurcation-using-a-new-mesh-approach
#1
S I S Pinto, J B L M Campos, E Azevedo, C F Castro, L C Sousa
The definition of a suitable mesh to simulate blood flow in the human carotid bifurcation has been investigated. In this research, a novel mesh generation method is proposed: hexahedral cells at the centre of the vessel and a fine grid of tetrahedral cells near the artery wall, in order to correctly simulate the large blood velocity gradients associated with specific locations. The selected numerical examples to show the pertinence of the novel generation method are supported by carotid ultrasound (US) image data of a patient-specific case...
February 22, 2018: International Journal for Numerical Methods in Biomedical Engineering
https://www.readbyqxmd.com/read/29470342/acog-practice-bulletin-no-192-management-of-alloimmunization-during-pregnancy
#2
(no author information available yet)
When any fetal blood group factor inherited from the father is not possessed by the mother, antepartum or intrapartum fetal-maternal bleeding may stimulate an immune reaction in the mother. Maternal immune reactions also can occur from blood product transfusion. The formation of maternal antibodies, or "alloimmunization," may lead to various degrees of transplacental passage of these antibodies into the fetal circulation. Depending on the degree of antigenicity and the amount and type of antibodies involved, this transplacental passage may lead to hemolytic disease in the fetus and neonate...
March 2018: Obstetrics and Gynecology
https://www.readbyqxmd.com/read/29470338/acog-practice-bulletin-no-192-summary-management-of-alloimmunization-during-pregnancy
#3
(no author information available yet)
When any fetal blood group factor inherited from the father is not possessed by the mother, antepartum or intrapartum fetal-maternal bleeding may stimulate an immune reaction in the mother. Maternal immune reactions also can occur from blood product transfusion. The formation of maternal antibodies, or "alloimmunization," may lead to various degrees of transplacental passage of these antibodies into the fetal circulation. Depending on the degree of antigenicity and the amount and type of antibodies involved, this transplacental passage may lead to hemolytic disease in the fetus and neonate...
March 2018: Obstetrics and Gynecology
https://www.readbyqxmd.com/read/29470285/clinical-and-imaging-predictors-of-surgical-splenorenal-shunt-dysfunction-in-pediatric-patients
#4
Andrew Woerner, Giri Shivaram, Kevin S H Koo, Evelyn K Hsu, Andre A S Dick, Eric J Monroe
PURPOSE: Few established criteria exist to prompt angiographic evaluation and intervention for surgically created splenorenal shunts (SRS). Clinical and Doppler ultrasound (DUS) imaging predictors of shunt dysfunction were evaluated in this retrospective study. MATERIALS AND METHODS: Consecutive patients undergoing SRS angiography over a 10-year period were retrospectively identified. Preangiography platelet count and DUS measurements of spleen diameter, maximum splenic vein velocity, and maximum shunt velocity were assessed and compared to findings at subsequent catheter angiography...
February 21, 2018: Journal of Pediatric Gastroenterology and Nutrition
https://www.readbyqxmd.com/read/29468000/an-accurate-diagnostic-pathway-helps-to-correctly-distinguish-between-the-possible-causes-of-acute-scrotum
#5
Beat Roth, Ioannis Giannakis, Meret Elisabeth Ricklin, George Niklaus Thalmann, Aristomenis Konstantinos Exadaktylos
Objectives: We sought to identify a simplified approach for the rapid differential diagnosis of patients presenting with acute scrotum. Methods: A total of 440 patients referred to the emergency department of the University Hospital of Bern, Switzerland, with acute scrotum between 2003 and 2013 were retrospectively analyzed. Simple and multiple binary logistic regression analyses were used to evaluate clinical and laboratory parameters that may help to distinguish between genital/paragenital infection and acute testicular torsion...
January 2018: Oman Medical Journal
https://www.readbyqxmd.com/read/29467359/evaluation-of-a-portable-doppler-ultrasound-gating-device-for-fetal-cardiac-mr-imaging-initial-results-at-1-5t-and-3t
#6
Fabian Kording, Bjoern P Schoennagel, Manuela Tavares de Sousa, Kai Fehrs, Gerhard Adam, Jin Yamamura, Christian Ruprecht
PURPOSE: Fetal cardiac MRI has the potential to play an important role in the assessment of fetal cardiac pathologies, but it is up to now not feasible due to a missing gating method. The purpose of this work was the evaluation of Doppler ultrasound (DUS) for external fetal cardiac gating with regard to compatibility, functionality, and reliability. Preliminary results were assessed performing fetal cardiac MRI. METHODS: An MRI conditional DUS device was developed to obtain a gating signal from the fetal heart...
February 21, 2018: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/29463207/effects-of-flexible-ureteroscopy-on-renal-blood-flow-a-prospective-evaluation
#7
Tarik Emre Sener, Yiloren Tanidir, Saeed Bin Hamri, Ibrahim Halil Sever, Burcu Ozdemir, Abdulla Al-Humam, Olivier Traxer
OBJECTIVE: This study aimed to investigate the effects of flexible ureteroscopy (F-URS) on renal blood flow using renal Doppler ultrasound (US). MATERIALS AND METHOD: Patients undergoing F-URS were scheduled for Doppler US preoperatively and postoperatively. Peak systolic velocity (PSV), end-diastolic velocity (EDV), resistive index (RI) and pulsatility index (PI) were reported. Technical details, operation time, stone characteristics and complications were recorded...
February 20, 2018: Scandinavian Journal of Urology
https://www.readbyqxmd.com/read/29462898/do-nonalcoholic-fatty-liver-disease-and-fetuin-a-play-different-roles-in-symptomatic-coronary-artery-disease-and-peripheral-arterial-disease
#8
Fabio Nascimbeni, Dante Romagnoli, Stefano Ballestri, Enrica Baldelli, Simonetta Lugari, Valentina Sirotti, Valentina Giampaoli, Amedeo Lonardo
BACKGROUND AND AIMS: Nonalcoholic fatty liver disease (NAFLD) is strongly associated with both atherosclerotic cardiovascular disease (CVD) and Fetuin-A. However, the association of Fetuin-A with atherosclerosis is more controversial. We hypothesized that the pathogenic interplay of NAFLD, Fetuin-A and atherosclerosis varies based on arterial site. Accordingly, we aimed to assess NAFLD prevalence, Fetuin-A values and their relationship with symptomatic atherosclerosis occurring in different localizations: coronary artery disease (CAD) vs...
February 16, 2018: Diseases (Basel)
https://www.readbyqxmd.com/read/29462847/use-of-the-ultrasound-based-total-malignancy-score-in-the-management-of-thyroid-nodules
#9
Giovanni Guido Pompili, Silvia Tresoldi, Anna Ravelli, Alessandra Primolevo, Giovanni Di Leo, Gianpaolo Carrafiello
Purpose: The purpose of this study was to validate the role of the total malignancy score (TMS) in identifying thyroid nodules suspicious for malignancy through the sum of their ultrasound features. Methods: The local ethical committee approved this prospective observational study. We examined 231 nodules in 231 consecutive patients (164 females and 67 males; age range, 20 to 87 years; median age, 59 years; interquartile range, 48 to 70 years) who underwent ultrasound followed by fine-needle aspiration cytology (FNAC)...
January 6, 2018: Ultrasonography
https://www.readbyqxmd.com/read/29462837/reduced-arterial-vasodilation-in-response-to-hypoxia-impairs-cerebral-and-peripheral-oxygen-delivery-in-hypertensive-men
#10
Igor A Fernandes, Marcos P Rocha, Monique O Campos, João D Mattos, Daniel E Mansur, Helena N M Rocha, Paulo A C Terra, Vinícius P Garcia, Natália G Rocha, Niels H Secher, Antonio C L Nóbrega
This study investigated whether hypertension impairs isocapnic hypoxia (IH)-induced cerebral and skeletal muscle hyperemia to an extent that limits oxygen supply. Oxygen saturation (Oxymetry), mean arterial pressure (MAP, photoplethysmography), muscle sympathetic nerve activity (MSNA, microneugraphy), and femoral (FA), internal carotid (ICA) and vertebral (VA) artery blood flow (BF, Doppler ultrasound) were quantified in 9 normotensive (NT, 40 ± 11 yrs., systolic (SP) 119 ± 7 mmHg and diastolic pressure (DP) 73 ± 6 mmHg) and 9 hypertensive men (HT, 44 ± 12 yrs...
February 20, 2018: Journal of Physiology
https://www.readbyqxmd.com/read/29461604/a-novel-ultrasound-based-vascular-calcification-score-calcs-to-detect-subclinical-atherosclerosis
#11
R Flore, M A Zocco, M E Ainora, C Fonnesu, A Nesci, A Gasbarrini, F R Ponziani
OBJECTIVE: To quantify non-coronary vascular calcifications (VC) in asymptomatic patients at low-intermediate cardiovascular risk by a new color Doppler ultrasound (DUS)-based score (the carotid, aortic, lower limbs calcium score, CALCs), and to correlate this score with classical parameters associated with cardiovascular risk [carotid intima media thickness (IMT), and arterial stiffness (AS)]. PATIENTS AND METHODS: All consecutive asymptomatic patients who underwent a screening DUS of non-coronary circulation were evaluated and patients at low-intermediate cardiovascular risk were selected according to Framingham risk score (FRS)...
February 2018: European Review for Medical and Pharmacological Sciences
https://www.readbyqxmd.com/read/29461267/a-prospective-transcranial-doppler-ultrasound-based-evaluation-of-the-effects-of-repetitive-subconcussive-head-trauma-on-neurovascular-coupling-dynamics
#12
Alexander D Wright, Jonathan D Smirl, Kelsey Bryk, Michael Jakovac, Paul van Donkelaar
OBJECTIVE: To determine the effects of repetitive subconcussive head trauma on neurovascular coupling (NVC) responses. DESIGN: Prospective cohort study collected between September 2013 and December 2016. SETTING: University laboratory. PARTICIPANTS: One hundred seventy-nine elite, junior-level (age, 19.6 ± 1.5 years) contact sport (ice hockey, American football) athletes recruited for preseason testing. Fifty-two nonconcussed athletes returned for postseason testing...
February 14, 2018: Clinical Journal of Sport Medicine: Official Journal of the Canadian Academy of Sport Medicine
https://www.readbyqxmd.com/read/29458980/right-lower-quadrant-abdominal-pain-do-not-forget-about-ovarian-torsion-on-the-computed-tomography-scan
#13
William Shyy, Roneesha S Knight, Nathan A Teismann
BACKGROUND: Abdominal pain is one of the most common chief complaints of patients presenting to emergency departments, and emergency physicians (EPs) often evaluate patients with right lower quadrant abdominal pain. Ovarian torsion is a rare cause of abdominal pain, but early diagnosis is essential for salvage of the affected ovary. The diagnostic study of choice for ovarian torsion is a pelvic ultrasound with color Doppler, but it is important for EPs and radiologists to be aware of findings of ovarian torsion that might appear on computed tomography (CT)...
February 17, 2018: Journal of Emergency Medicine
https://www.readbyqxmd.com/read/29458325/comparison-of-continuous-wave-doppler-ultrasound-monitor-and-echocardiography-to-assess-cardiac-output-in-intensive-care-patients
#14
Brendan E Smith, Veronica M Madigan
No abstract text is available yet for this article.
March 2018: Critical Care and Resuscitation: Journal of the Australasian Academy of Critical Care Medicine
https://www.readbyqxmd.com/read/29458114/severity-dependent-influence-of-isocapnic-hypoxia-on-reaction-time-is-independent-of-neurovascular-coupling
#15
Hannah G Caldwell, Geoff B Coombs, Michael M Tymko, Daniela Nowak-Flück, Philip N Ainslie
With exposure to acute normobaric hypoxia, global cerebral oxygen delivery is maintained via increases in cerebral blood flow (CBF); therefore, regional and localized changes in oxygen tension may explain neurocognitive impairment. Neurovascular coupling (NVC) is the close temporal and regional relationship of CBF to changes in neural activity and may aid in explaining the localized CBF response with cognitive activation. High-altitude related cognitive impairment is likely affected by hypocapnic cerebral vasoconstriction that may influence regional CBF regulation independent of hypoxia...
February 16, 2018: Physiology & Behavior
https://www.readbyqxmd.com/read/29457587/power-cavitation-guided-blood-brain-barrier-opening-with-focused-ultrasound-and-microbubbles
#16
Mark T Burgess, Iason Zacharias Apostolakis, Elisa E Konofagou
Image-guided monitoring of microbubble-based focused ultrasound (FUS) therapies relies on the accurate localization of FUS-stimulated microbubble activity (i.e. acoustic cavitation). Passive cavitation imaging with ultrasound arrays can achieve this, but with insufficient spatial resolution. In this study, we address this limitation and perform high-resolution monitoring of acoustic cavitation-mediated blood-brain barrier (BBB) opening with a new technique called power cavitation imaging. By synchronizing the FUS transmit and passive receive acquisition, high-resolution passive cavitation imaging was achieved by using delay and sum (DAS) beamforming with absolute time delays...
February 19, 2018: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/29456213/association-of-serum-fibroblast-growth-factor-23-with-doppler-pulse-wave-velocity-in-hemodialysis-patients
#17
Walaa H Ibrahim, Ahmad B Ahmad, Noha G Sayed
We aimed to study the association of fibroblast growth factor-23 (FGF-23) as a novel cardiovascular risk factor with Doppler pulse wave velocity (PWV) as an arterial stiffness measuring tool in hemodialysis (HD) patients. We conducted a cross-sectional study in which blood samples from 86 HD patients were obtained to estimate FGF 23 and other parameters. Flow waveforms were obtained at two locations within right common carotid artery, and right femoral artery by Doppler ultrasound with ECG recorded in addition...
January 2018: Saudi Journal of Kidney Diseases and Transplantation
https://www.readbyqxmd.com/read/29453817/endocrine-and-psychological-aspects-of-sexual-dysfunction-in-klinefelter-patients
#18
A Ferlin, R Selice, S Angelini, M Di Grazia, N Caretta, F Cavalieri, A Di Mambro, C Foresta
Klinefelter syndrome is a frequent cause of hypogonadism, but despite hundreds of publications on different aspects of Klinefelter syndrome, only a few studies dealt with sexual dysfunction. In particular, testosterone is critical for various aspects of sexual response, but its role on sexuality in Klinefelter syndrome patients is debatable and no studies have evaluated the efficacy of testosterone treatment on sexual dysfunction in these subjects. Furthermore, the impact of psychological and relational aspects on sexual function of Klinefelter syndrome subjects is poorly defined...
February 17, 2018: Andrology
https://www.readbyqxmd.com/read/29453782/unusual-spontaneous-porto-systemic-shunt-the-importance-of-diagnosing-non-anatomical-porto-systemic-shunts-to-improve-portal-flow-in-pediatric-living-related-liver-transplantation-case-report
#19
Juan S Rubio, Carolina Rumbo, Pablo A Farinelli, Nicolás Aguirre, Diego A Ramisch, Hugo Paladini, Pablo D Angelo, Pablo Barros Schelotto, Gabriel E Gondolesi
Collateral circulation secondary to liver cirrhosis may cause the development of large PSSs that may steal flow from the main portal circulation. It is important to identify these shunts prior to, or during the transplant surgery because they might cause an insufficient portal flow to the implanted graft. There are few reports of "steal flow syndrome" cases in pediatrics, even in biliary atresia patients that may have portal hypoplasia as an associated malformation. We present a 12-month-old female who received an uneventful LDLT from her mother, and the GRWR was 4...
February 16, 2018: Pediatric Transplantation
https://www.readbyqxmd.com/read/29452906/extracranial-arterial-wall-volume-is-increased-and-shows-relationships-with-vascular-mri-measures-in-idiopathic-parkinson-s-disease
#20
Stephen Ball, Sarah Al-Bachari, Laura M Parkes, Hedley C A Emsley, Charles N McCollum
OBJECTIVE: Idiopathic Parkinson's disease (IPD) is the second most common neurodegenerative disorder, often complicated by dementia. Cardiovascular risk factors and spontaneous cerebral emboli (SCE) are strongly associated with Alzheimer's (AD) and vascular dementia (VaD). We measured SCE in the middle cerebral artery and arterial wall volume in the extracranial arteries in patients with IPD and controls, and explored the relationships with structural and physiological MRI brain neurovascular measures...
February 10, 2018: Clinical Neurology and Neurosurgery
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