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https://www.readbyqxmd.com/read/29139245/evaluation-of-a-pointwise-microcirculation-assessment-method-using-liquid-and-multilayered-tissue-simulating-phantoms
#1
Ingemar Fredriksson, Rolf B Saager, Anthony J Durkin, Tomas Strömberg
A fiber-optic probe-based instrument, designed for assessment of parameters related to microcirculation, red blood cell tissue fraction (fRBC), oxygen saturation (SO2), and speed resolved perfusion, has been evaluated using state-of-the-art tissue phantoms. The probe integrates diffuse reflectance spectroscopy (DRS) at two source-detector separations and laser Doppler flowmetry, using an inverse Monte Carlo method for identifying the parameters of a multilayered tissue model. Here, we characterize the accuracy of the DRS aspect of the instrument using (1) liquid blood phantoms containing yeast and (2) epidermis-dermis mimicking solid-layered phantoms fabricated from polydimethylsiloxane, titanium oxide, hemoglobin, and coffee...
November 2017: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/29136193/early-first-trimester-uteroplacental-flow-and-the-progressive-disintegration-of-spiral-artery-plugs-new-insights-from-contrast-enhanced-ultrasound-and-tissue-histopathology
#2
V H J Roberts, T K Morgan, P Bednarek, M Morita, G J Burton, J O Lo, A E Frias
STUDY QUESTION: Does the use of a vascular contrast agent facilitate earlier detection of maternal flow to the placental intervillous space (IVS) in the first trimester of pregnancy? SUMMARY ANSWER: Microvascular filling of the IVS was demonstrated by contrast-enhanced ultrasound from 6 weeks of gestation onwards, earlier than previously believed. WHAT IS KNOWN ALREADY: During placental establishment and remodeling of maternal spiral arteries, endovascular trophoblast cells invade and accumulate in the lumen of these vessels to form 'trophoblast plugs'...
November 10, 2017: Human Reproduction
https://www.readbyqxmd.com/read/29133170/hydronephrosis-and-crossing-vessels-in-children-optimization-of-diagnostic-therapeutic-pathway-and-analysis-of-color-doppler-ultrasound-and-magnetic-resonance-urography-diagnostic-accuracy
#3
M C Y Wong, G Piaggio, M B Damasio, C Molinelli, S M Ferretti, A Pistorio, G Ghiggeri, M L Degl'Innocenti, A Canepa, V Incarbone, G Mattioli
INTRODUCTION: Ureteropelvic junction obstruction (UPJO) is one of the most frequent urological diseases affecting the pediatric population. It can be due to both intrinsic stenosis of the junction and extrinsic causes such as the presence of crossing vessels (CVs), which can be detected by color Doppler ultrasound (CD-US). Magnetic resonance urography (MRU) is a good alternative, but sedation and infusion of a contrast agent are required. OBJECTIVE: The aim of this study was to analyze the diagnostic accuracy of CD-US and MRU in visualizing CVs in pediatric hydronephrosis, in order to decide the correct diagnostic pathway in the pre-operative phase...
October 27, 2017: Journal of Pediatric Urology
https://www.readbyqxmd.com/read/29133152/laparoscopic-assisted-uterus-retrieval-from-live-organ-donors-for-uterine-transplant
#4
Shailesh Puntambekar, Milind Telang, Pankaj Kulkarni, Sanjeev Jadhav, Ravindra Sathe, Neeta Warty, Seema Puntambekar, Sandesh Kade, Mangesh Panse, Nikhil Agarkhedkar, Giriraj Gandhi, Manoj Manchekar, Hirav Parekh, Kajal Parikh, Riddhi Desai, Mehul Mehta, Mihir Chitale, Sambit Nanda
OBJECTIVE: The authors present the first ever laparoscopic assisted uterus retrieval in live donor for uterus transplant. DESIGN: A step-by-step surgical demonstration SETTING: Galaxy CARE Laparoscopy Institute, Pune, India PATIENT(S): Two patients, ages 21 and 26 with Mayer Rokitansky Kuster Hauser (MRKH) syndrome and Ashermann's syndrome respectively, with their mothers as donors. INTERVENTION(S): A Twelve member team was formed. After review of available literature on uterine transplant a protocol was formulated and submitted to the IRB...
November 10, 2017: Journal of Minimally Invasive Gynecology
https://www.readbyqxmd.com/read/29132649/doppler-versus-thermodilution-derived-coronary-microvascular-resistance-to-predict-coronary-microvascular-dysfunction-in-patients-with-acute-myocardial-infarction-or-stable-angina-pectoris
#5
Rupert P Williams, Guus A de Waard, Kalpa De Silva, Matthew Lumley, Kaleab Asrress, Satpal Arri, Howard Ellis, Awais Mir, Brian Clapp, Amedeo Chiribiri, Sven Plein, Paul F Teunissen, Maurits R Hollander, Michael Marber, Simon Redwood, Niels van Royen, Divaka Perera
Coronary microvascular resistance is increasingly measured as a predictor of clinical outcomes, but there is no accepted gold-standard measurement. We compared the diagnostic accuracy of 2 invasive indices of microvascular resistance, Doppler-derived hyperemic microvascular resistance (hMR) and thermodilution-derived index of microcirculatory resistance (IMR), at predicting microvascular dysfunction. A total of 54 patients (61 ± 10 years) who underwent cardiac catheterization for stable coronary artery disease (n = 10) or acute myocardial infarction (n = 44) had simultaneous intracoronary pressure, Doppler flow velocity and thermodilution flow data acquired from 74 unobstructed vessels, at rest and during hyperemia...
October 10, 2017: American Journal of Cardiology
https://www.readbyqxmd.com/read/29130647/randomized-controlled-trial-of-electro-stimulation-therapies-to-modulate-retinal-blood-flow-and-visual-function-in-retinitis-pigmentosa
#6
Ava K Bittner, Kenneth Seger, Rachel Salveson, Samantha Kayser, Natalia Morrison, Patricia Vargas, Deborah Mendelsohn, Jorge Han, Hua Bi, Gislin Dagnelie, Alexandra Benavente, Jessica Ramella-Roman
PURPOSE: We examined changes in visual function and ocular and retinal blood flow (RBF) among retinitis pigmentosa (RP) participants in a randomized controlled trial of electro-stimulation therapies. METHODS: Twenty-one RP participants were randomized (1:1:1) to transcorneal electrical stimulation (TES) at 6 weekly half-hour sessions, electro-acupuncture or inactive laser acupuncture (sham control) at 10 half-hour sessions over 2 weeks. Early Treatment of Diabetic Retinopathy Study (ETDRS) visual acuity (VA), quick contrast sensitivity function, Goldmann visual fields, AdaptDx scotopic sensitivity, spectral flow and colour Doppler imaging of the central retinal artery (CRA), and RBF in macular capillaries were measured twice pre-treatment, after 2 TES sessions, within a week and a month after intervention completion...
November 11, 2017: Acta Ophthalmologica
https://www.readbyqxmd.com/read/29129395/echocardiographic-nomograms-for-upper-abdominal-aorta-doppler-systolic-wave-values-and-systo-diastolic-diameters-variations-in-children
#7
Massimiliano Cantinotti, Raffaele Giordano, Iuri Corsini, Carlo Dani, Marco Scalese, Bruno Murzi, Nadia Assanta, Isabella Spadoni, Sabrina Molinaro, Shelby Kutty, Giorgio Iervasi, Eliana Franchi
BACKGROUND: Abdominal aorta pulsatility and blood flow patterns are important diagnostic indicators in congenital heart disease. Reference values for these indexes are lacking. METHODS: We prospectively studied abdominal aorta pulsed-wave Doppler systolic peak velocity, deceleration time, and wave duration, and two-dimensional vessel diameters in systole and diastole in healthy Caucasian children. Heteroscedasticity was accounted for by White or Breusch-Pagan test...
November 9, 2017: Journal of Cardiology
https://www.readbyqxmd.com/read/29122959/prefrontal-oxygenation-correlates-to-the-responses-in-facial-skin-blood-flows-during-exposure-to-pleasantly-charged-movie
#8
Kanji Matsukawa, Kana Endo, Ryota Asahara, Miho Yoshikawa, Shinya Kusunoki, Tomoko Ishida
Our laboratory reported that facial skin blood flow may serve as a sensitive tool to assess an emotional status. Cerebral neural correlates during emotional interventions should be sought in relation to the changes in facial skin blood flow. To test the hypothesis that prefrontal activity has positive relation to the changes in facial skin blood flow during emotionally charged stimulation, we examined the dynamic changes in prefrontal oxygenation (with near-infrared spectroscopy) and facial skin blood flows (with two-dimensional laser speckle and Doppler flowmetry) during emotionally charged audiovisual challenges for 2 min (by viewing comedy, landscape, and horror movie) in 14 subjects...
November 2017: Physiological Reports
https://www.readbyqxmd.com/read/29122223/the-utility-of-ultrasound-superb-microvascular-imaging-for-evaluation-of-breast-tumour-vascularity-comparison-with-colour-and-power-doppler-imaging-regarding-diagnostic-performance
#9
A Y Park, B K Seo, O H Woo, K S Jung, K R Cho, E K Park, S H Cha, J Cha
AIM: To investigate the utility of superb microvascular imaging (SMI) for evaluating the vascularity of breast masses in comparison with colour or power Doppler ultrasound (US) and the effect on diagnostic performance. MATERIALS AND METHODS: A total of 191 biopsy-proven masses (99 benign and 92 malignant) in 166 women with greyscale, colour Doppler, power Doppler, and SMI images were enrolled in this retrospective study. Three radiologists analysed the vascular images using a three-factor scoring system to evaluate the number, morphology, and distribution of tumour vessels...
November 6, 2017: Clinical Radiology
https://www.readbyqxmd.com/read/29121934/effect-of-rosuvastatin-on-fasting-and-postprandial-endothelial-biomarker-levels-and-microvascular-reactivity-in-patients-with-type-2-diabetes-and-dyslipidemia-a-preliminary-report
#10
Kyoung Min Kim, Kyong Yeun Jung, Han Mi Yun, Seo Young Lee, Tae Jung Oh, Hak Chul Jang, Soo Lim
BACKGROUND: The cardiovascular benefits of statins have been proven, but their effect on circulation in small vessels has not been examined fully. We investigated the effect of 20 mg rosuvastatin on biomarkers, including paraoxonase-1 (PON-1) and asymmetric dimethylarginine (ADMA), and on microvascular reactivity. METHOD: We enrolled 20 dyslipidemic patients with type 2 diabetes and 20 age- and body mass index (BMI)-matched healthy controls. Rosuvastatin (20 mg/day) was given to the patient group for 12 weeks...
November 9, 2017: Cardiovascular Diabetology
https://www.readbyqxmd.com/read/29117957/nocturnal-oxyhemoglobin-desaturation-and-arteriopathy-in-a-pediatric-sickle-cell-disease-cohort
#11
Nomazulu Dlamini, Dawn E Saunders, Michael Bynevelt, Sara Trompeter, Timothy C Cox, Romola S Bucks, Fenella J Kirkham
OBJECTIVE: The purpose of this study of sickle cell disease (SCD) was to determine whether arteriopathy, measurable as intracranial vessel signal loss on magnetic resonance angiography (MRA), was associated with low nocturnal hemoglobin oxygen saturation (SpO2) or hemolytic rate, measurable as reticulocytosis or unconjugated hyperbilirubinemia. METHODS: Ninety-five East London children with SCD without prior stroke had overnight pulse oximetry, of whom 47 (26 boys, 39 hemoglobin SS; mean age 9...
November 8, 2017: Neurology
https://www.readbyqxmd.com/read/29112643/assessment-of-fetal-congenital-heart-diseases-by-4-dimensional-ultrasound-using-spatiotemporal-image-correlation-pictorial-review
#12
Edward Araujo Júnior, Gabriele Tonni, Nathalie Jeanne Bravo-Valenzuela, Fabricio Da Silva Costa, Simon Meagher
The aim of this pictorial review is to describe the technical advances achieved through the application of 4-dimensional (4D) ultrasound using spatiotemporal image correlation (STIC) over conventional 2-dimensional ultrasound in the prenatal detection of congenital heart disease (CHD). Spatiotemporal image correlation is a volume imaging technique that simplifies fetal heart studies while providing more diagnostic information than is typically available from traditional 2-dimensional studies. Four-dimensional software allows the study of cardiac anatomy and function during a single cardiac cycle and has greatly contributed to diagnostic enhancement of CHD...
November 6, 2017: Ultrasound Quarterly
https://www.readbyqxmd.com/read/29110446/dense-concentric-circle-scanning-protocol-for-measuring-pulsatile-retinal-blood-flow-in-rats-with-doppler-optical-coherence-tomography
#13
Bingyao Tan, Zohreh Hosseinaee, Kostadinka Bizheva
The variability in the spatial orientation of retinal blood vessels near the optic nerve head (ONH) results in imprecision of the measured Doppler angle and therefore the pulsatile blood flow (BF), when those parameters are evaluated using Doppler OCT imaging protocols based on dual-concentric circular scans. Here, we utilized a dense concentric circle scanning protocol and evaluated its precision for measuring pulsatile retinal BF in rats for different numbers of the circular scans. An spectral domain optical coherence tomography (SD-OCT) system operating in the 1060-nm spectral range with image acquisition rate of 47,000 A-scans/s was used to acquire concentric circular scans centered at the rat's ONH, with diameters ranging from 0...
November 2017: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/29095241/effects-of-cerebral-blood-flow-and-vessel-conditions-on-speech-recognition-in-patients-with-postlingual-adult-cochlear-implant-predictable-factors-for-the-efficacy-of-cochlear-implant
#14
Takashi Ishino, Mahmoud Ali Ragaee, Tatsuya Maruhashi, Masato Kajikawa, Yukihito Higashi, Toru Sonoyama, Sachio Takeno, Katsuhiro Hirakawa
OBJECTIVES: Cochlear implantation (CI) has been the most successful procedure for restoring hearing in a patient with severe and profound hearing loss. However, possibly owing to the variable brain functions of each patient, its performance and the associated patient satisfaction are widely variable. The authors hypothesize that peripheral and cerebral circulation can be assessed by noninvasive and globally available methods, yielding superior presurgical predictive factors of the performance of CI in adult patients with postlingual hearing loss who are scheduled to undergo CI...
October 31, 2017: Ear and Hearing
https://www.readbyqxmd.com/read/29094487/effectiveness-of-fetal-cardiac-screening-for-congenital-heart-disease-using-a-combination-of-the-four-chamber-view-and-three-vessel-view-during-the-second-trimester-scan
#15
Mina Itsukaichi, Takehiro Serikawa, Kosuke Yoshihara, Hiroshi Suzuki, Kazufumi Haino, Masayuki Yamaguchi, Takayuki Enomoto, Koichi Takakuwa
AIM: We aimed to assess the accuracy and effectiveness of fetal cardiac screening for congenital heart disease (CHD) during the second trimester by general obstetricians in a non-selected population. METHODS: In this multicenter, prospective cohort study of fetal cardiac screening, four-chamber and three-vessel views were recorded by obstetricians at 18-21 gestational weeks (GW). A total of 3005 fetuses that were scheduled for delivery at our institution were included...
November 2, 2017: Journal of Obstetrics and Gynaecology Research
https://www.readbyqxmd.com/read/29091702/measurement-of-the-absolute-velocity-of-blood-flow-in-early-stage-chick-embryos-using-spectral-domain-optical-coherence-tomography
#16
Z-H Ma, Y-S Ma, Y-Q Zhao, J Liu, J-H Liu, J-T Lv, Y Wang
Doppler optical coherence tomography (OCT) is a noninvasive imaging modality that provides quantitative flow information with high spatial and temporal resolution. However, it is only sensitive to the flow velocity vector parallel to the incident beam. To calculate the absolute velocity, it is necessary to obtain the angle between the incident beam and flow field. In this paper, we describe a practical method to measure the Doppler angle based on the structural information of blood vessels extracted from spectral domain OCT images...
November 1, 2017: Applied Optics
https://www.readbyqxmd.com/read/29089115/tnf-alpha-inhibition-could-reduce-biomarkers-of-endothelial-dysfunction-in-patients-with-moderate-to-severe-psoriasis-a-52-week-echo-doppler-based-quasi-experimental-study
#17
Alejandro Molina-Leyva, Fermín Garrido-Pareja, José Carlos Ruiz-Carrascosa, Ricardo Ruiz-Villaverde
OBJECTIVES: Psoriasis is associated to endothelial dysfunction, which causes impaired vascular functioning. TNF-α blockers have shown the ability to improve vascular functioning in psoriasis. The nailfold vessel resistance index (NVRI) assesses microvascular functioning at nailfold. The objectives of the study is to assess the effect of the TNF-α inhibition with adalimumab on NVRI. MATERIAL AND METHODS: Quasi-experimental study. Fifteen patients with moderate-severe psoriasis received adalimumab 40mg sc according to label information...
October 28, 2017: Medicina Clínica
https://www.readbyqxmd.com/read/29079961/in-achilles-tendinopathy-the-neovascularization-detected-by-contrast-enhanced-ultrasound-ceus-is-abundant-but-not-related-to-symptoms
#18
Armanda De Marchi, Simona Pozza, Enzo Cenna, Franco Cavallo, Giorgia Gays, Luca Simbula, Paola De Petro, Alessandro Massè, Giuseppe Massazza
PURPOSE AND HYPOTHESIS: Mid-portion Achilles tendinopathy is characterized by a proliferation of small vessels, called neovascularization, which can be demonstrated by power Doppler sonography (PD). Neovascularization can be correlated with diagnosis and consequent therapies focused on vascular supply. Published data regarding the relationship between neovascularisation and symptoms, such as pain and disability, are contradictory. The hypothesis that contrast-enhanced ultrasound (CEUS) could detect with more sensibility than PD the new vessel ingrowth in human degenerated Achilles tendons and therefore the correlation of neovascularization with pain and disability, was evaluated...
October 27, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/29072497/efficacy-and-safety-of-ultrasound-guided-percutaneous-glue-embolization-in-iatrogenic-haemorrhagic-complications-of-paracentesis-and-thoracocentesis-in-cirrhotic-patients
#19
Amar Mukund, Vinay Kumar Dp, Naveen Kumar Condati, Ajeet Singh Bhadoria, Shiv Kumar Sarin
OBJECTIVE: To compare the safety and efficacy of ultrasound guided percutaneous glue (N-butyl-2-cyanoacrylate) embolization with transarterial embolization in the management of iatrogenically injured arteries while performing paracentesis or thoracocentesis in patients with chronic liver disease. METHODS: Hospital database was searched for cirrhotic patients having abdominal/thoracic wall haemorrhage following paracentesis/thoracocentesis procedure from January 2011 to June 2016...
November 8, 2017: British Journal of Radiology
https://www.readbyqxmd.com/read/29072062/morpho-functional-cardiovascular-adaptation-in-hypertensive-patients-two-dimensional-speckle-tracking-echocardiographic-study
#20
Ines P Monte, Chiara DI Benedetto, Filippo A Atanasio, Valentina Losi, Salvatore Licciardi, Corrado Tamburino
BACKGROUND: Twenty-four-hour Blood Pressure (BP) variability is an important predictor of organ damage and cardiovascular events. Although epidemiological data are widely based on evaluation of office (Clinic) BP, 24-hour Ambulatory BP monitoring (ABPM) accurately assess the severity of hypertension to predict cardiovascular events in hypertensive patients, because it more accurately reflects BP load on heart and blood vessels. Conventional transthoracic echocardiography (TTE), such as M-mode and two-dimensional (2D), and more advanced techniques, such as tissue Doppler imaging (TDI) and speckle tracking echocardiography (STE), are used to identify pathological changes of the hypertensive heart disease...
October 25, 2017: Minerva Cardioangiologica
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