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Doppler ultrasound

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https://www.readbyqxmd.com/read/29035937/ultrasound-detection-of-arteria-comitans-a-novel-technique-to-locate-the-sciatic-nerve
#1
Hesham Elsharkawy, Babak Kateby Kashy, Rovnat Babazade, Andrew T Gray
In the gluteal and thigh region, the arteria comitans accompanies the sciatic nerve for a short distance, then penetrates the nerve and runs to the lower part of the thigh. There is no study that recognizes this artery as a guide to the location of the sciatic nerve. In this report, we describe a series of 6 knee arthroplasty patients in whom ultrasound-guided sciatic nerve block was successfully performed using color Doppler and pulsed wave Doppler to visualize the arteria comitans as a guide to the location of the sciatic nerve...
October 13, 2017: Regional Anesthesia and Pain Medicine
https://www.readbyqxmd.com/read/29035216/spiral-flow-phantom-for-ultrasound-flow-imaging-experimentation
#2
Billy Y S Yiu, Alfred C H Yu
As new ultrasound flow imaging methods are being developed, there is a growing need to devise appropriate flow phantoms that can holistically assess the accuracy of the derived flow estimates. In this paper, we present a novel spiral flow phantom design whose Archimedean spiral lumen naturally gives rise to multi-directional flow over all possible angles (i.e. from 0° to 360°). Developed using lost-core casting principles, the phantom geometry comprised a three-loop spiral (4 mm diameter, 5 mm pitch), and it was set to operate in steady flow mode (3 mL/s flow rate)...
October 13, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/29034765/assessment-of-maternal-cerebral-blood-flow-velocity-by-transcranial-doppler-ultrasound-before-delivery-and-in-the-early-postpartum-period
#3
Hale Z Batur Caglayan, Bijen Nazliel, Mehmet Cinar, Esra Ataoglu, Ozlem Moraloglu, Ceyla Irkec
OBJECTIVE: This prospective observational study aimed to identify the effects of labor on cerebral hemodynamics by measuring the middle cerebral artery (MCA) blood flow velocity by transcranial Doppler ultrasound (TCD), and the related factors just before delivery and within the 24 h after delivery. METHODS: The study included 35 healthy pregnant women with a gestational age of >37 weeks who were in labor and a control group including healthy, age-matched, nonpregnant women (n = 24)...
October 16, 2017: Journal of Maternal-fetal & Neonatal Medicine
https://www.readbyqxmd.com/read/29034490/hepatic-complications-of-umbilical-venous-catheters-in-the-neonatal-period-the-ultrasound-spectrum
#4
Betul Emine Derinkuyu, Oznur Leman Boyunaga, Cagri Damar, Sezin Unal, Ebru Ergenekon, Ayse Gul Alimli, Cigdem Oztunali, Canan Turkyilmaz
OBJECTIVES: Umbilical venous catheterization is commonly used in the neonatal period; however, it has some complications. In this study, we evaluated neonates who underwent umbilical venous catheterization and developed hepatic complications. Furthermore, we aimed to define all of the possible lesions and to clarify the imaging findings of umbilical venous catheter-induced hepatic injury. METHODS: Two hundred forty-four neonates who underwent umbilical venous catheterization between March 2013 and September 2015 in a single tertiary care referral center were included in this study...
October 16, 2017: Journal of Ultrasound in Medicine: Official Journal of the American Institute of Ultrasound in Medicine
https://www.readbyqxmd.com/read/29034283/endovenous-laser-ablation-of-spermatic-vein-for-the-treatment-of-varicocele
#5
Antonio Basile, Alessandro Motta, Giovanni Failla, Giuseppe Caltabiano, Marco Pizzarelli, Cecilia Gozzo, Davide Castiglione, Stefano Palmucci
INTRODUCTION: Varicocele is a relatively complex pathology of the scrotum veins', known to be one of the easiest to treat. Modern treatment involves both surgical (open, laparoscopic and microsurgery) and interventional approach (either with coils and/or sclerosant injection). Our aim is to demonstrate the feasibility and the reliability of endovenous laser ablation (EVLA) of the spermatic vein for the treatment of varicocele. MATERIALS AND METHODS: We consecutively and prospectively treated 11 patients (age range 24-45 years old, mean 31y) with left varicocele, phlebografically classified as Bahren type I and with indication for percutaneous treatment...
2017: European Journal of Radiology Open
https://www.readbyqxmd.com/read/29032909/subclinical-synovitis-measured-by-ultrasound-in-rheumatoid-arthritis-patients-with-clinical-remission-induced-by-synthetic-and-biological-modifying-disease-drugs
#6
Marcos Cruces, Soham Al Snih, Natalí Serra-Bonett, Juan C Rivas
BACKGROUND: Rheumatoid arthritis (RA) patients with disease in clinical remission might show subclinical synovitis, which can be related to the progress of structural joint damage. OBJECTIVE: To determine and compare the degree of synovial inflammation by ultrasound (US) in patients with RA in clinical remission, treated with DMARD or combination therapy with DMARD and anti-TNF. METHODS: Hospital-based cross-sectional study of 58 patients with RA in sustained remission for at least 6 months by DAS28 <2...
October 9, 2017: Reumatología Clinica
https://www.readbyqxmd.com/read/29031367/chapter-5-ultrasound-characteristics-of-benign-vs-malignant-cervical-lymph-nodes
#7
Ramanujam Prativadi, Nirvikar Dahiya, Aya Kamaya, Shweta Bhatt
With approximately 800 lymph nodes in the body, and more than one-third found within the head and neck, lymph nodes are a common site for neck pathology. Differentiation between benign and malignant lymph nodes is critical in accurate prognosis; similarly, treatment hinges on accurate identification of the etiology of the pathologic process. Key gray-scale and color Doppler ultrasound criteria can help accurately distinguish between benign and malignant lymph nodes.
October 2017: Seminars in Ultrasound, CT, and MR
https://www.readbyqxmd.com/read/29030715/point-of-care-transcranial-doppler-by-intensivists
#8
REVIEW
Vincent Issac Lau, Robert Thomas Arntfield
In the unconscious patient, there is a diagnostic void between the neurologic physical exam, and more invasive, costly and potentially harmful investigations. Transcranial color-coded sonography and two-dimensional transcranial Doppler imaging of the brain have the potential to be a middle ground to bridge this gap for certain diagnoses. With the increasing availability of point-of-care ultrasound devices, coupled with the need for rapid diagnosis of deteriorating neurologic patients, intensivists may be trained to perform point-of-care transcranial Doppler at the bedside...
October 13, 2017: Critical Ultrasound Journal
https://www.readbyqxmd.com/read/29030342/the-sex-specific-impact-of-aging-on-the-blood-pressure-response-to-exercise
#9
Joel D Trinity, Gwenael Layec, Corey R Hart, Russell S Richardson
An exaggerated blood pressure (BP) response to exercise has been linked to cardiovascular disease (CVD), but little is known about the impact of age and sex on this response. Therefore, this study examined the hemodynamic and skeletal muscle metabolic response to dynamic plantar flexion exercise, at 40% of WRmax, in 40 physical activity-matched young (n=20, 23±1 yr) and old (n=20, 73±2 yr), equally distributed, male and female subjects. Central hemodynamics and BP (finometer), popliteal artery (PA) blood flow (Doppler ultrasound), and skeletal muscle metabolism (phosphorous magnetic resonance spectroscopy, (31)P-MRS) were measured during 5 mins of plantar flexion exercise...
October 13, 2017: American Journal of Physiology. Heart and Circulatory Physiology
https://www.readbyqxmd.com/read/29025782/olfactory-bulb-agenesis-with-normal-sexual-hormones
#10
Prayuth Tunsuriyawong, Krit Pongpirul, Tagann Chaisam, Petpring Prajuabpansri
An 18-year-old Caucasian man presented with a lack of sense of surrounding smell. The problem was first noticed when a family member discussed the smell of the food, which he had no idea what it was. The patient had normal development and sexual function, no history of trauma, surgery, chemical exposure or infection. Physical examination revealed no significant abnormalities. Smell threshold test using phenyl-ethyl-alcohol revealed bilateral anosmia. MRI showed bilateral aplastic olfactory bulbs and tracts associated with absent cortical growth of the olfactory sulci and asymmetrical gyrus rectus...
October 11, 2017: BMJ Case Reports
https://www.readbyqxmd.com/read/29025210/up-to-date-doppler-techniques-for-breast-tumor-vascularity-superb-microvascular-imaging-and-contrast-enhanced-ultrasound
#11
Ah Young Park, Bo Kyoung Seo
Ultrasonographic Doppler techniques have improved greatly over the years, allowing more sophisticated evaluation of breast tumor vascularity. Superb microvascular imaging (SMI) and contrast-enhanced ultrasound (CEUS) with second-generation contrast agents are two representative up-to-date techniques. SMI is a sensitive Doppler technique that adopts an intelligent filter system to separate low-flow signals from artifacts. With the development of second-generation contrast agents, CEUS has also emerged as a useful Doppler technique for evaluating tumor microcirculation...
August 19, 2017: Ultrasonography
https://www.readbyqxmd.com/read/29025023/-why-do-i-feel-this-pain-b-mode-and-power-doppler-ultrasound-found-the-answer-a-neurovascular-conflict
#12
Giulia Piccinini, Daniele Coraci, Fabio Lodispoto, Chiara Cambise, Silvia Giovannini, Luca Padua
No abstract text is available yet for this article.
August 12, 2017: Pain Medicine: the Official Journal of the American Academy of Pain Medicine
https://www.readbyqxmd.com/read/29024421/generalized-estimating-equation-model-to-compare-drug-effects-on-synovitis-of-the-dominant-wrist-in-severe-rheumatoid-arthritis-between-tocilizumab-versus-adalimumab-versus-abatacept-using-high-resolution-ultrasound
#13
Ying-Chou Chen, Wen-Chan Chiu, Fu-Mei Su, Jia-Feng Chen
PURPOSE: The use of biological agents has revolutionized the treatment of rheumatoid arthritis (RA). However, details of serial synovial changes in imaging evaluation are unclear. Using power Doppler (PD) ultrasound, this study aimed to evaluate the comparative efficacy of biologicals for patients with refractory RA, with the hope that these findings could aid in clinical decision making. METHODS: Patients with RA who received abatacept, adalimumab or tocilizumab therapy were enrolled...
October 12, 2017: International Journal of Rheumatic Diseases
https://www.readbyqxmd.com/read/29022101/microflow-imaging-new-doppler-technology-to-detect-low-grade-inflammation-in-patients-with-arthritis
#14
A K P Lim, K Satchithananda, E A Dick, S Abraham, D O Cosgrove
AIM: To assess the efficacy of microvascular imaging in detecting low-grade inflammation in arthritis compared with Power Doppler ultrasound (PDUS). METHOD AND MATERIALS: Patients presenting for ultrasound with arthralgia were assessed with grey-scale, PDUS and Superb Microvascular Imaging (SMI). Videoclips were stored for analysis at a later date. Three musculoskeletal radiologists scored grey-scale changes, signal on PDUS and/or SMI within these joints. If a signal was detected on both PDUS and SMI, the readers graded the conspicuity of vascular signal from the two Doppler techniques using a visual analogue scale...
October 11, 2017: European Radiology
https://www.readbyqxmd.com/read/29021168/functional-ultrasound-imaging-of-brain-activity-in-human-newborns
#15
Charlie Demene, Jérome Baranger, Miguel Bernal, Catherine Delanoe, Stéphane Auvin, Valérie Biran, Marianne Alison, Jérome Mairesse, Elisabeth Harribaud, Mathieu Pernot, Mickael Tanter, Olivier Baud
Functional neuroimaging modalities are crucial for understanding brain function, but their clinical use is challenging. Recently, the use of ultrasonic plane waves transmitted at ultrafast frame rates was shown to allow for the spatiotemporal identification of brain activation through neurovascular coupling in rodents. Using a customized flexible and noninvasive headmount, we demonstrate in human neonates that real-time functional ultrasound imaging (fUSI) is feasible by combining simultaneous continuous video-electroencephalography (EEG) recording and ultrafast Doppler (UfD) imaging of the brain microvasculature...
October 11, 2017: Science Translational Medicine
https://www.readbyqxmd.com/read/29019582/ultrasound-guided-foam-sclerotherapy-for-severe-chronic-venous-insufficiency
#16
Guilherme Camargo Gonçalves de-Abreu, Otacílio de Camargo, Márcia Fayad Marcondes de-Abreu, José Luís Braga de-Aquino
Chronic venous insufficiency is characterized by cutaneous alterations caused by venous hypertension; in severe forms, it progresses to lower limb ulcers. Lower limb varicose veins are the main cause of chronic venous insufficiency, and the classic treatment includes surgery and compressive therapy. Minimally invasive alternative treatments for varicose veins include new techniques such as venous thermal ablation using laser or radiofrequency. The use of different methods depends on clinical and anatomical factors...
September 2017: Revista do Colégio Brasileiro de Cirurgiões
https://www.readbyqxmd.com/read/29019471/infantile-hemangioma-factors-causing-recurrence-after-propranolol-treatment
#17
Lei Chang, Dongze Lv, Zhang Yu, Gang Ma, Hanru Ying, Yajing Qiu, Yifei Gu, Yunbo Jin, Hui Chen, Xiaoxi Lin
BackgroundPropranolol is the first-choice treatment for severe infantile hemangioma (IH). However, 10- 30% of lesions relapse after propranolol treatment. The mechanisms underlying IH recurrence after propranolol treatment have not been completely elucidated.MethodsThis study combined an examination of hemodynamic changes with research regarding hemangioma stem cells (hscs) with differentially expressed microRNAs (miRNAs) to identify the factors affecting IH recurrence after propranolol treatment. Hemodynamic changes were monitored in 21 recurrent cases using high-frequency color Doppler ultrasound, and hscs were treated with different concentrations of propranolol...
October 11, 2017: Pediatric Research
https://www.readbyqxmd.com/read/29018183/a-case-of-left-renal-vein-ligation-in-a-patient-with-solitary-left-kidney-undergoing-liver-transplantation-to-control-splenorenal-shunt-and-improve-portal-venous-flow
#18
Rodrigo B Martino, Eserval Rocha Júnior, Valdano Manuel, Vinicius Rocha-Santos, Luis Augusto C D'Albuquerque, Wellington Andraus
BACKGROUND Adequate portal venous flow is required for successful liver transplantation. Reduced venous flow and blood flow 'steal' by collateral vessels are a concern, and when there is a prominent splenorenal shunt present, ligation of the left renal vein has been recommended to improve portal venous blood flow. CASE REPORT A 51-year-old man who had undergone right nephrectomy in childhood required liver transplantation for liver cirrhosis and hepatocellular carcinoma due to hepatitis C virus (HCV) infection...
October 11, 2017: American Journal of Case Reports
https://www.readbyqxmd.com/read/29017899/a-brain-computer-interface-based-on-functional-transcranial-doppler-ultrasound-using-wavelet-transform-and-support-vector-machines
#19
Aya Khalaf, Matthew Sybeldon, Ervin Sejdic, Murat Akcakaya
BACKGROUND: Functional transcranial Doppler (fTCD) is an ultrasound based neuroimaging technique used to assess neural activation that occurs during a cognitive task through measuring velocity of cerebral blood flow. NEW METHOD: The objective of this paper is to investigate the feasibility of a 2-class and 3-class real-time BCI based on blood flow velocity in left and right middle cerebral arteries in response to mental rotation and word generation tasks. Statistical features based on a five-level wavelet decomposition were extracted from the fTCD signals...
October 7, 2017: Journal of Neuroscience Methods
https://www.readbyqxmd.com/read/29016539/color-doppler-ultrasound-supports-early-diagnosis-of-mixed-high-and-low-risk-of-recurrence-subtypes-in-the-same-basal-cell-carcinoma-lesion
#20
Nadia Vega, Ximena Wortsman, Nelson Navarrete, Ivo Sazunic
No abstract text is available yet for this article.
October 6, 2017: Dermatologic Surgery: Official Publication for American Society for Dermatologic Surgery [et Al.]
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