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doppler of vessels

Marion Bienert, Niklas Plange, Andreas Remky, Kay Oliver Arend, David Kuerten
Purpose: Ischemic ocular disorders may be treated by hypervolemic hemodilution. The presumed therapeutic benefit is based on a volume effect and improved rheological factors. The aim was to investigate the acute effect of intravenous hydroxyethyl starch on retrobulbar hemodynamics in patients with nonarteritic anterior ischemic optic neuropathy (NAION). Methods: 24 patients with acute NAION were included. Retrobulbar hemodynamics were measured using color Doppler imaging before and 15 min after intravenous infusion of 250 cc 10% hydroxyethyl starch (HES)...
2018: BioMed Research International
Derick Okwan-Duodu, Laura Hansen, Giji Joseph, Alicia N Lyle, Daiana Weiss, David R Archer, W Robert Taylor
OBJECTIVE: The adaptive response to vascular injury is the formation of functional collateral vessels to maintain organ integrity. Many of the clinical complications associated with sickle cell disease can be attributed to repeated bouts of vascular insufficiency, yet the detailed mechanisms of collateral vessel formation after injury are largely unknown in sickle cell disease. Here, we characterize postischemic neovascularization in sickle cell disease and the role of neutrophils in the production of reactive oxygen species...
March 15, 2018: Arteriosclerosis, Thrombosis, and Vascular Biology
Misun Hwang, Matthew A Thimm, Anthony L Guerrerio
PURPOSE: Cavernous transformation of the portal vein can be missed on color Doppler exam or arterial phase cross-sectional imaging due to their slow flow and delayed enhancement. Contrast-enhanced ultrasound (CEUS) offers many advantages over other imaging techniques and can be used to successfully detect cavernous transformations of the portal vein. METHODS: A 10-month-old female was followed for repeat episodes of hematemesis. Computed tomography angiography (CTA) and magnetic resonance arteriogram (MRA) and portal venography were performed...
March 13, 2018: Journal of Ultrasound
Daniel Høyer Iversen, Lasse Løvstakken, Geirmund Unsgård, Ingerid Reinertsen
PURPOSE: In neurosurgery, reliable information about blood vessel anatomy and flow direction is important to identify, characterize, and avoid damage to the vasculature. Due to ultrasound Doppler angle dependencies and the complexity of the vascular architecture, clinically valuable 3-D flow direction information is currently not available. In this paper, we aim to clinically validate and demonstrate the intraoperative use of a fully automatic method for estimation of 3-D blood flow direction from freehand 2-D Doppler ultrasound...
March 13, 2018: International Journal of Computer Assisted Radiology and Surgery
Bin Bai, Jiadela Teliewubai, Yuyan Lu, Shikai Yu, Jing Xiong, Chen Chi, Yiwu Zhou, Hongwei Ji, Ximin Fan, Jacques Blacher, Jue Li, Yi Zhang, Yawei Xu
This study aimed to investigate the discrepancy between pulse wave velocity (PWV) and pulse pressure amplification (PPA) in association with hypertensive target organ damage (TOD) in the elderly. From June 2014 to August 2015, 1599 participants aged >65 years old from communities located in northern Shanghai were recruited. Carotid-femoral pulse wave velocity (cfPWV), peripheral blood pressure (BP), central BP and other TOD indicators, including the ratio of the early ventricular filling velocity (E) to the peak velocity of the tissue Doppler velocity of septal mitral annulus (E/Ea), left ventricular mass index (LVMI), carotid intima-medium thickness (CIMT), estimated glomerular filtration rate (eGFR), and urinary albumin-creatinine ratio (ACR), were determined for each participant...
March 13, 2018: Hypertension Research: Official Journal of the Japanese Society of Hypertension
Mert Ozan Bahtiyar, Emre Ekmekci, Emine Demirel, Roxanna A Irani, Joshua A Copel
Monochorionic twin pregnancies are at risk of unique complications due to placental sharing and vascular connections between placental territories assigned for each twin. Twin anemia-polycythemia sequence (TAPS) is an infrequent but potentially dangerous complication of abnormal placental vascular connections. TAPS occurs due to very-small-caliber (< 1 mm) abnormal placental vascular connections which lead to chronic anemia in the donor twin and polycythemia in the recipient twin. TAPS may occur spontaneously or following fetoscopic laser photocoagulation of communicating placental vessels for twin-twin transfusion syndrome...
March 13, 2018: Fetal Diagnosis and Therapy
R A J Wain, D J Smith, D R Hammond, J P M Whitty
Arterial thrombus formation is directly related to the mechanical shear experienced by platelets within flow. High shear strain rates (SSRs) and large shear gradients cause platelet activation, aggregation and production of thrombus. This study, for the first time, investigates the influence of pulsatile flow on local haemodynamics within sutured microarterial anastomoses. We measured physiological arterial waveform velocities experimentally using Doppler ultrasound velocimetry, and a representative example was applied to a realistic sutured microarterial geometry...
March 6, 2018: Microvascular Research
Rafi Sheikh, Khashayar Memarzadeh, Christian Torbrand, Jonas Blohmé, Sandra Lindstedt, Malin Malmsjö
Purpose: The eyelid is commonly dissected and divided in the process of, for example, blepharotomy, entropion repair, or when preparing a full-thickness eyelid flap to reconstruct a tumor defect. No study has yet been conducted to examine how perfusion in an eyelid is affected by dissection, using modern imaging techniques. Methods: The eyelid was divided with a 10-mm vertical incision, 5 mm from the medial canthus, and the incision was extended horizontally by 30 mm to provide a full-thickness eyelid. Blood perfusion was measured along the length of the free dissected eyelid using both laser Doppler velocimetry and laser speckle contrast imaging...
2018: Eplasty
A Srivastava, S K Sureka, S Prabhakaran, H Lal, M S Ansari, R Kapoor
Radiocephalic arteriovenous fistula (RCAVF) is the first choice for native arteriovenous fistula (AVF). Preoperative vessel assessment with ultrasonography (USG) has been reported to enhance the outcome of native AVF, but data regarding its predictive value for functional maturation of RCAVF are scanty. We aimed to determine the role of preoperative duplex USG (DUS) for prediction of functional maturity of radiocephalic fistula in the wrist. The data from 173 patients were analyzed prospectively. The estimated duplex variable included size, patency, and continuity of cephalic vein and size, peak systolic velocity, and wall calcifications in radial artery at the wrist...
January 2018: Indian Journal of Nephrology
Mads Ammitzbøll Danielsen
Rheumatod arthritis is a chronic systemic autoimmune disease, characterized by inflammation in joints and tendon sheaths, which frequently leads to permanent and serious disability due to joint destruction, but also tendon and ligament ruptures. Clinical management of rheumatoid arthritis has traditionally been supported by biochemical and radiographic findings. However, imaging modalities like ultrasound and magnetic resonance imaging (MRI) have improved the possibility for better management of rheumatoid arthritis patients, due to higher sensitivity and specificity for detecting ongoing inflammation, this thesis is focusing on tenosynovitis as recent studies have shown that inflammation in tendon sheaths, i...
March 2018: Danish Medical Journal
Andreas Hjelm Brandt
This PhD project is based on a longstanding collaboration between physicists and engineers from the Center of Fast Ultrasound Imaging (CFU) at the Technical University of Denmark and medical doctors from the department of Radiology at Rigshospitalet. The intent of this cooperation is to validate new ultrasonic methods for future clinical use. 
Study I compares two B-mode ultrasound methods: the new experimental technique Synthetic Aperture Sequential Beam-forming combined with Tissue Harmonic Imaging (SASB-THI), and a conventional technique combined with THI...
March 2018: Danish Medical Journal
Adrian J Y Chee, Alfred C H Yu
The eigen-based filter has theoretically established itself as a potent solution in ultrasound color flow imaging (CFI) for combating against clutter arising from moving tissues. Yet, it remains poorly understood on how much gain in flow detection sensitivity and specificity can be delivered by this adaptive clutter filter. Here, we investigated the receiver operating characteristic (ROC) of the eigen-based clutter filter to statistically evaluate its efficacy. Our investigation was conducted using a new vascular phantom testbed that incorporated both intrinsic tissue motion (vessel pulsation: 7...
March 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
Kyu Yeon Hur, Ji Eun Jun, Young Ju Choi, Yong Ho Lee, Dae Jung Kim, Seok Won Park, Byung Wook Huh, Eun Jig Lee, Sun Ha Jee, Kap Bum Huh, Sung Hee Choi
BACKGROUND: The clinical utility of ankle-brachial index (ABI) is not clear in subjects with less severe or calcified vessel. Therefore, we investigated the usefulness of color Doppler ultrasonography for diagnosing peripheral artery disease (PAD) in type 2 diabetes mellitus (T2DM) subjects. METHODS: We analyzed 324 T2DM patients who concurrently underwent ABI and carotid intima-media thickness (CIMT) measurements and color Doppler ultrasonography from 2003 to 2006...
February 2018: Diabetes & Metabolism Journal
Angela E Rankine-Mullings, Nadine Morrison-Levy, Deanne Soares, Karen Aldred, Lesley King, Susanna Ali, Jennifer M Knight-Madden, Margaret Wisdom-Phipps, Robert J Adams, Russell E Ware, Marvin Reid
This study investigated the association of nutritional and haematological variables with maximum time-averaged mean velocity (TAMV) measured by transcranial Doppler (TCD) velocity and the agreement of classification between two protocols. TCD categories included: normal (<170 cm/s), conditional (170-199 cm/s) and abnormal (≥200 cm/s) based on TAMV in distal internal carotid artery (dICA), middle cerebral artery (MCA), internal carotid bifurcation, anterior and posterior cerebral arteries. Of 358 children with sickle cell anaemia (SCA) examined, the mean age (±standard deviation) was 7·4 ± 2·7 years; 13·1% and 6·7% had conditional and abnormal velocities, respectively...
March 5, 2018: British Journal of Haematology
Sergio Gianesini, Erica Menegatti, Francesco Sisini, Savino Occhionorelli, Federico Annoni, Byung-Boong Lee, Paolo Zamboni
OBJECTIVES: The aim was to assess more accurately the net flow of the lower limb perforating veins (PVs). MATERIAL AND METHODS: This was an observational prospective study. Two hundred and twenty one limbs with chronic venous disease (C1-6EpAs,pPr) of 193 patients underwent a duplex ultrasound (DUS). All identified PVs were scanned also by means of quality Doppler profile (QDP) multigate analysis in order to determine their net inward and outward flow direction...
March 1, 2018: European Journal of Vascular and Endovascular Surgery
Cosimo Bleve, Valeria Bucci, Maria Luisa Conighi, Francesco Battaglino, Lorenzo Costa, Lorella Fasoli, Elisa Zolpi, Salvatore Fabio Chiarenza
Horseshoe kidney (HSK) is a congenital defect of the urinary tract that occurs in 0.25% of the general population. Laparoscopic Vascular Hitch (LVH) according to Hellstrom-Chapman represent an alternative approach in treatment of extrinsic hydronephrosis by crossing vessels (CV) in pediatric age. In our Department from 2006 to 2016, 36 children with extrinsic-Uretero-Pelvic-Junction (UPJ)-Obstruction (UPJO) underwent laparoscopic vessels transposition. Over the last 4years, we have treated three patients with extrinsic hydronephrosis in HSK; two males and one female respectively of 6, 7 and 8years...
December 13, 2017: La Pediatria Medica e Chirurgica: Medical and Surgical Pediatrics
Silvia Baggio, Paola Pomini, Fabiana Galeone, Francesca Presti, Lorenza Santi, Ricciarda Raffaelli, Massimo Franchi
OBJECTIVES: To investigate the modifications of uterine and fibroid volume, to study Doppler changes in uterine arteries and fibroid-supplying vessels, and to assess possible symptomatic relief after 3 months of treatment with ulipristal acetate. METHODS: Forty-two premenopausal women with symptomatic fibroids were included in the study. They were evaluated clinically for the symptoms reported and underwent ultrasound examinations before starting treatment and after 3 months of therapy with ulipristal acetate...
March 2, 2018: Journal of Ultrasound in Medicine: Official Journal of the American Institute of Ultrasound in Medicine
Arkadiusz Krzyżanowski, Dariusz Swatowski, Tomasz Gęca, Maciej Kwiatek, Aleksandra Stupak, Sławomir Woźniak, Anna Kwaśniewska
BACKGROUND: Persistent right umbilical vein (PRUV) is usually an isolated finding but it may be accompanied by other fetal malformations. AIMS: We aimed to determine the incidence of prenatally diagnosed PRUV in a referral population, assess the neonatal outcome and discuss the findings together with those from previous publications. MATERIALS AND METHODS: A total of 2360 women with low-risk singleton pregnancies were examined in the second and third trimesters...
March 2, 2018: Australian & New Zealand Journal of Obstetrics & Gynaecology
Sabino J Pietrangelo, Hae-Seung Lee, Charles G Sodini
OBJECTIVE:  Practical deficiencies related to conventional transcranial Doppler (TCD) sonography have restricted its use and applicability. This work seeks to mitigate several such constraints through the development of a wearable, electronically steered TCD velocimetry system, which enables noninvasive measurement of cerebral blood flow velocity (CBFV) for monitoring applications with limited operator interaction. MATERIALS AND METHODS: A highly-compact, discrete prototype system was designed and experimentally validated through flow phantom and preliminary human subject testing...
2018: Acta Neurochirurgica. Supplement
Michael Dobrzeniecki, Alex Trofimov, Denis E Bragin
OBJECTIVE: The main role of the cerebral arterial compliance (cAC) is to maintain the stiffness of vessels and protect downstream vessels when changing cerebral perfusion pressure. The aim was to examine the flexibility of the cerebral arterial bed based on the assessment of the cAC in patients with traumatic brain injury (TBI) in groups with and without intracranial hematomas (IHs). MATERIALS AND METHODS: We examined 80 patients with TBI (mean age, 35.7 ± 12.8 years; 42 men, 38 women)...
2018: Acta Neurochirurgica. Supplement
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