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doppler of vessels

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https://www.readbyqxmd.com/read/29330892/ophthalmic-artery-doppler-prediction-of-preeclampsia-a-systematic-review-and-meta-analysis
#1
REVIEW
Erkan Kalafat, Ariana Laoreti, Asma Khalil, Fabricio Da Silva Costa, Basky Thilaganathan
OBJECTIVE: To determine the accuracy of ophthalmic artery Doppler in pregnancy for the prediction of preeclampsia. METHODS: MEDLINE (1947-2017), EMBASE (1974-2017), CINAHL (inception-2017) and the Cochrane Library (inception-2017) were searched for relevant citations without language restrictions. Two reviewers independently selected studies that evaluated the accuracy of ophthalmic artery Doppler to predict the development of preeclampsia and performed data extraction to construct 2 × 2 tables...
January 12, 2018: Ultrasound in Obstetrics & Gynecology
https://www.readbyqxmd.com/read/29323660/laser-doppler-sensing-for-blood-vessel-detection-with-a-biologically-inspired-steerable-needle
#2
Vani Virdyawan, Matthew Oldfield, Ferdinando Rodriguez Y Baena
Puncturing blood vessels during percutaneous intervention in minimally invasive brain surgery can be a life threatening complication. Embedding a forward looking sensor in a rigid needle has been proposed to tackle this problem but, when using a rigid needle, the procedure needs to be interrupted and the needle extracted if a vessel is detected. As an alternative, we propose a novel optical method to detect a vessel in front of a steerable needle. The needle itself is based on a biomimetic, multi-segment design featuring four hollow working channels...
January 11, 2018: Bioinspiration & Biomimetics
https://www.readbyqxmd.com/read/29313878/postpartum-ct-angiography-of-the-fetoplacental-macrovasculature-in-normal-pregnancies-and-in-those-complicated-by-fetal-growth-restriction
#3
Mette Østergaard Thunbo, Marianne Sinding, Anne Sofie Korsager, Jens Brøndum Frøkjaer, Lasse Riis Østergaard, Astrid Petersen, Charlotte Overgaard, Anne Sørensen
INTRODUCTION: Current knowledge of the fetoplacental vasculature in fetal growth restriction (FGR) due to placental dysfunction focuses on the microvasculature rather than the macrovasculature. The aim of this study was to investigate the feasibility of computed topography angiography to analyze the fetoplacental macrovasculature in normal and FGR pregnancies. MATERIAL AND METHODS: We included 29 placentas (22-42 weeks' gestation) from normal birthweight pregnancies and 8 placentas (26-37 weeks' gestation) from FGR pregnancies (birthweight < -15% and abnormal umbilical Doppler flow)...
January 4, 2018: Acta Obstetricia et Gynecologica Scandinavica
https://www.readbyqxmd.com/read/29306852/trichosporon-asahii-septic-thrombophlebitis-following-lower-extremity-amputation-in-an-immunocompetent-host
#4
Pradeep Kumar Mada, Folusakin Ayoade, Ailing Li, John Todd
A 59-year-old man with a history of peripheral vascular disease status post femoral popliteal bypass presented with critical limb ischaemia of the left leg. An arterial Doppler ultrasound showed an occluded graft requiring an above knee amputation. Five days after surgery, the patient developed fever, leucocytosis, significant stump swelling and pain, and serosanguinous discharge from his wound. Wound swab cultures from the stump grew Trichosporon asahii A venous Doppler ultrasound revealed extensive thrombosis of the left lower extremity...
January 6, 2018: BMJ Case Reports
https://www.readbyqxmd.com/read/29298964/-assessment-of-relationship-between-doppler-flows-in-pregnancies-after-41-week-and-the-incidence-of-cesarean-sections-with-induced-labour
#5
Hanna Makles, Jacek R Wilczyński
HASH(0x58af1b8) AIM: The aim of the study was to assess a relationship between the Doppler flows in foetal vessels, i.e. the middle cerebral artery (MCA), umbilical artery (UMA), umbilical vein (UV) and ductus venosus (DV) as well as in maternal vessels, i.e. the right uterine artery (UAR), left uterine artery (UAL) and the incidence of cesarean sections in pregnancies after 41 week with induced labour. MATERIALS AND METHODS: The study included 130 pregnant women, including 100 pregnant women, between 41 and 42 weeks of gestation, in whom induced labour resulted in a cesarean section due to three main indications: lack of progress of labour (Group I-44), signs of foetal distress (Group II-32) and lack of response to induced labour (Group III-24)...
December 22, 2017: Polski Merkuriusz Lekarski: Organ Polskiego Towarzystwa Lekarskiego
https://www.readbyqxmd.com/read/29297234/the-effect-of-modulated-electro-hyperthermia-on-temperature-and-blood-flow-in-human-cervical-carcinoma
#6
Lee Sun-Young, Jong-Hun Kim, Yeon-Hee Han, Dong-Hyu Cho
INTRODUCTION: Mild hyperthermia has been known to enhance the response of tumors to radiotherapy or chemotherapy by increasing tumor blood flow, thereby increasing tumor oxygenation or drug delivery. The purpose of this study was to assess the changes in temperature and blood flow in human cervical cancer in response to regional heating with modulated electro-hyperthermia (mEHT). METHODS: The pelvic area of 20 patients with cervical carcinoma was heated with mEHT...
January 3, 2018: International Journal of Hyperthermia
https://www.readbyqxmd.com/read/29286398/evaluation-of-vascular-control-mechanisms-utilizing-video-microscopy-of-isolated-resistance-arteries-of-rats
#7
Kathleen M Lukaszewicz, Matthew J Durand, Jessica R C Priestley, James R Schmidt, L Adrienne Allen, Aron M Geurts, Julian H Lombard
This protocol describes the use of in vitro television microscopy to evaluate vascular function in isolated cerebral resistance arteries (and other vessels), and describes techniques for evaluating tissue perfusion using Laser Doppler Flowmetry (LDF) and microvessel density utilizing fluorescently labeled Griffonia simplicifolia (GS1) lectin. Current methods for studying isolated resistance arteries at transmural pressures encountered in vivo and in the absence of parenchymal cell influences provide a critical link between in vivo studies and information gained from molecular reductionist approaches that provide limited insight into integrative responses at the whole animal level...
December 5, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/29281991/superb-microvascular-imaging-smi-compared-with-conventional-ultrasound-for-evaluating-thyroid-nodules
#8
Ruigang Lu, Yuxin Meng, Yan Zhang, Wei Zhao, Xun Wang, Mulan Jin, Ruijun Guo
BACKGROUND: Superb microvascular imaging (SMI) for depiction of microvascular flow in thyroid nodules was compared with color/power Doppler imaging (CDI/PDI) and contrast-enhanced ultrasonography (CEUS). In addition, the diagnostic performance of conventional ultrasound combined with SMI for differentiating benign and malignant thyroid nodules was evaluated. METHODS: Preoperative conventional ultrasound consisting of gray-scale ultrasonography and CDI/PDI, followed by SMI and CEUS, was used to record 52 thyroid nodules...
December 28, 2017: BMC Medical Imaging
https://www.readbyqxmd.com/read/29280236/advanced-pediatric-neurosonography-techniques-contrast-enhanced-ultrasonography-elastography-and-beyond
#9
REVIEW
Misun Hwang, Becky J Riggs, Joseph Katz, Donna Seyfert, Frances Northington, Robinson Shenandoah, Irina Burd, Justin McArthur, Kassa Darge, Matthew A Thimm, Thierry A G M Huisman
Recent technical advances in neurosonography continue broadening the diagnostic utility, sensitivity, and specificity of ultrasound for detecting intracranial abnormalities bed side. The clinical and functional applications of neurosonography have significantly expanded since the 1980s when transcranial Doppler sonography first allowed anatomic and hemodynamic delineation of the intracranial vessels through the thin temporal skull. In the past few years, contrast-enhanced ultrasonography, elastography, 3D/4D reconstruction tools, and high-resolution microvessel imaging techniques have further enhanced the diagnostic significance of neurosonography...
December 27, 2017: Journal of Neuroimaging: Official Journal of the American Society of Neuroimaging
https://www.readbyqxmd.com/read/29279888/prevalence-of-systemic-atherosclerosis-burdens-and-overlapping-stroke-etiologies-and-their-associations-with-long-term-vascular-prognosis-in-stroke-with-intracranial-atherosclerotic-disease
#10
Takao Hoshino, Leila Sissani, Julien Labreuche, Gregory Ducrocq, Philippa C Lavallée, Elena Meseguer, Céline Guidoux, Lucie Cabrejo, Cristina Hobeanu, Fernando Gongora-Rivera, Pierre-Jean Touboul, Philippe Gabriel Steg, Pierre Amarenco
Importance: Patients who have experienced stroke with intracranial atherosclerotic disease (ICAD) may also have concomitant atherosclerosis in different arterial beds and other possible causes for ischemic stroke. However, little is known about the frequency and prognostic effect of such overlapping diseases. Objectives: To describe the prevalence of systemic atherosclerotic burdens and overlapping stroke etiologies and their contributions to long-term prognoses among patients who have experienced stroke with ICAD...
December 26, 2017: JAMA Neurology
https://www.readbyqxmd.com/read/29273932/treatment-of-gigantomastia-using-a-medial-lateral-bipedicle-reduction-mammoplasty-the-role-of-doppler-assisted-preoperative-perforator-identification
#11
Nader Gomaa Elmelegy, Mohamed Saad Sadaka, Ahmed M Hegazy, Doaa E Abdeldaim
The purpose of this study is to introduce a breast reduction technique designed to reduce the incidence of postoperative nipple-areola complex ischemia and necrosis following reduction mammoplasty, while at the same time allowing all the other goals of breast reduction to be realized. This is achieved through preoperative detection of perforating vessels supplying the nipple-areola complex using a hand-held Doppler. The horizontally based parenchymal pedicle is designed to include these perforators whether originating from the internal mammary artery, lateral thoracic artery or both...
December 22, 2017: Aesthetic Plastic Surgery
https://www.readbyqxmd.com/read/29273893/intraoperative-doppler-sonogram-in-pediatric-liver-transplants-a-pictorial-review-of-intraoperative-and-early-postoperative-complications
#12
A Luana Stanescu, Shawn E Kamps, André A S Dick, Marguerite T Parisi, Grace S Phillips
A spectrum of vascular complications can be seen in pediatric liver transplant patients, including occlusion and hemodynamically significant narrowing of the vessels that provide inflow to or outflow from the graft. Intraoperative Doppler ultrasound (US) has the potential benefit of identifying vascular complications in pediatric liver transplant patients prior to abdominal closure. Importantly, intraoperative Doppler US can be used as a problem-solving tool in situations such as position-dependent kinking of the portal or hepatic veins, or in suspected vasospasm of the hepatic artery...
December 22, 2017: Pediatric Radiology
https://www.readbyqxmd.com/read/29244749/serum-levels-of-s100b-and-nse-proteins-in-patients-with-non-transfusion-dependent-thalassemia-as-biomarkers-of-brain-ischemia-and-cerebral-vasculopathy
#13
Aikaterini Kanavaki, Konstantinos Spengos, Maria Moraki, Polyxeni Delaporta, Catherine Kariyannis, Ioannis Papassotiriou, Antonis Kattamis
Patients with non-transfusion-dependent thalassemia (NTDT) are at risk of developing brain ischemia. Transcranial Doppler (TCD) has been established as a useful screening tool of cerebrovascular disease in patients with sickle cell disease. Proteins neuron specific enolase (NSE) and S100B are biomarkers that reflect CNS injury. The purpose of this study is to evaluate cerebral vessel vasculopathy and brain damage in NTDT patients using non-invasive methods as TCD and measurement serum levels of NSE and S100B...
December 15, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29242072/therapeutic-angiogenesis-by-local-sustained-release-of-microrna-126-using-poly-lactic-co-glycolic-acid-nanoparticles-in-murine-hindlimb-ischemia
#14
Shinichi Tsumaru, Hidetoshi Masumoto, Kenji Minakata, Masayasu Izuhara, Kazuhiro Yamazaki, Tadashi Ikeda, Koh Ono, Ryuzo Sakata, Kenji Minatoya
OBJECTIVE: Recent studies demonstrate that microRNAs show promising potential, including angiogenesis, in therapeutic intervention. MicroRNA-126 (miR-126) is reported to regulate angiogenesis by blocking Sprouty-related EVH1 domain-containing protein 1 (SPRED1), an endogenous inhibitor of vascular endothelial cell growth factor. In this study, we investigated the angiogenic effects of the sustained release of miR-126 loaded with poly lactic-co-glycolic acid (PLGA) nanoparticles (NPs) in a murine hindlimb ischemia model...
December 11, 2017: Journal of Vascular Surgery
https://www.readbyqxmd.com/read/29237489/self-expanding-nitinol-stents-of-high-versus-low-chronic-outward-force-in-de-novo-femoropopliteal-occlusive-arterial-lesions-bioflex-cof-trial-study-protocol-for-a-randomized-controlled-trial
#15
Alexander Wressnegger, Alexandra Kaider, Martin A Funovics
BACKGROUND: Self-expanding nitinol stents must be oversized at least by a minimal amount to ensure contact with the vessel wall and prevent migration. Once the stent is deployed it exerts a continuous force upon the vascular wall, termed chronic outward force (COF). Animal studies have found an increased neointimal hyperplasia in stents with high oversizing and thus high COF. Data about correlation between COF and neointimal hyperplasia in humans are currently lacking. The objective of the BIOFLEX-COF trial is to prospectively investigate differences in formation of intimal hyperplasia at 1 and 2 years after implantation of nitinol stents with high versus low COF in de novo femoropopliteal occlusive arterial lesions...
December 14, 2017: Trials
https://www.readbyqxmd.com/read/29229867/intracranial-pulsatility-in-patients-with-cerebral-small-vessel-disease-a-systematic-review
#16
Yulu Shi, Michael J Thrippleton, Ian Marshall, Joanna M Wardlaw
Growing evidence suggests that increased intracranial pulsatility is associated with cerebral small vessel disease (SVD). We systematically reviewed papers that assessed intracranial pulsatility in subjects with SVD. We included 27 cross-sectional studies (n=3356): 20 used Doppler ultrasound and 7 used phase-contrast MRI. Most studies measured pulsatility in the internal carotid or middle cerebral arteries (ICA, MCA), whereas few assessed veins or cerebrospinal fluid (CSF). Methods to reduce bias and risk factor adjustment were poorly reported...
December 11, 2017: Clinical Science (1979-)
https://www.readbyqxmd.com/read/29228086/new-methods-to-study-the-microcirculation
#17
Damiano Rizzoni, Claudia Agabiti Rosei, Carolina De Ciuceis, Francesco Semeraro, Marco Rizzoni, Franco Docchio
Essential hypertension is associated with structural alterations in the microvessels; in particular, an increase in the media thickness to internal lumen ratio of small resistance arteries (MLR) and a reduction in capillary density have been observed. The evaluation of the morphological characteristics of small resistance arteries in humans is challenging. The gold standard method is generally considered to be the measurement by wire or pressure micromyography of MLR of subcutaneous small vessels obtained by local biopsies...
December 7, 2017: American Journal of Hypertension
https://www.readbyqxmd.com/read/29204231/real-time-elastography-for-the-detection-of-fibrotic-and-inflammatory-tissue-in-patients-with-stricturing-crohn-s-disease
#18
Carla Serra, Fernando Rizzello, Chiara Pratico', Cristina Felicani, Erica Fiorini, Ramona Brugnera, Elena Mazzotta, Francesca Giunchi, Michelangelo Fiorentino, Antonietta D'Errico, Antonio Maria Morselli-Labate, Marianna Mastroroberto, Massimo Campieri, Gilberto Poggioli, Paolo Gionchetti
Purpose: The distinction between active inflammation and fibrosis of the bowel wall is essential for therapeutic decisions in stricturing Crohn's disease. We aimed to assess whether real-time elastography (RTE) with strain ratio measurement could be useful in differentiating fibrotic from inflamed bowel strictures and to evaluate the possible relationship between US techniques and the histology of the stenotic bowel wall. Materials and methods: Bowel ultrasonography (including RTE, color-Doppler and CEUS examination) was prospectively evaluated in 26 patients with symptomatic stricturing Crohn's disease, before surgery...
December 2017: Journal of Ultrasound
https://www.readbyqxmd.com/read/29203042/-treatment-of-radiation-induced-iliofemoral-arterial-complications-with-groin-radionecrosis
#19
J-M Fichelle
Long-term iliofemoral complications induced by radiation include vascular (arterial and venous) lesions, nervous lesions and soft tissue loss that can be cutaneous and subcutaneous and potentially lead to radionecrosis with vessel exposure. We present five cases of groin radionecrosis. There were three men and two women (age 30-73 years). Radiotherapy had been delivered 15 years earlier in three cases, and 2 years earlier in two cases. Symptoms were intermittent claudication (n=1), critical ischemia (n=1), and septic hemorrhage (n=1)...
December 2017: Journal de Médecine Vasculaire
https://www.readbyqxmd.com/read/29200974/stroke-volume-monitoring-novel-continuous-wave-doppler-parameters-algorithms-and-advanced-noninvasive-haemodynamic-concepts
#20
REVIEW
R A Phillips, B E Smith, V M Madigan
Purpose of Review: Adequate oxygen delivery is essential for life, with hypoxia resulting in dysfunction, and ultimately death, of the cells, organs and organism. Blood flow delivers the oxygen bound in the blood, while haemodynamics is the science of blood flow. Stroke volume (SV) is the fundamental unit of blood flow, and reflects the interdependent performance of the heart, the vessels and the autonomic nervous system. However, haemodynamic management remains generally poor and predominantly guided by simple blood pressure observations alone...
2017: Current Anesthesiology Reports
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