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https://www.readbyqxmd.com/read/28100426/ferumoxytol-mra-for-transcatheter-aortic-valve-replacement-planning-with-renal-insufficiency
#1
Kimberly Kallianos, Travis S Henry, Yerem Yeghiazarians, Jeffrey Zimmet, Kendrick A Shunk, Elaine E Tseng, Vaikom Mahadevan, Michael D Hope
BACKGROUND: Computed tomography angiography (CTA) is the test of choice for pre-procedure imaging of transcatheter aortic valve replacement (TAVR) candidates. The iodinated contrast required, however, increases the risk of renal dysfunction in patients with pre-existing renal failure. Ferumoxytol is a magnetic resonance imaging (MRI) contrast agent that can be used with renal failure. Its long vascular resonance time allows gated MRA sequences that approach CTA in image quality. We present respiratory and cardiac gated MRA enabled by ferumoxytol that can be post-processed in an analogous fashion to CTA...
December 30, 2016: International Journal of Cardiology
https://www.readbyqxmd.com/read/28099768/effects-of-metmyoglobin-reducing-activity-and-thermal-stability-of-nadh-dependent-reductase-and-lactate-dehydrogenase-on-premature-browning-in-ground-beef
#2
Blanchefort A Djimsa, Anupam Abraham, Gretchen G Mafi, Deborah L VanOverbeke, Ranjith Ramanathan
Premature browning is a condition wherein ground beef exhibits a well-done appearance before reaching the USDA recommended internal cooked meat temperature of 71.1 °C; however, the mechanism is unclear. The objectives of this study were: (1) to determine the effects of packaging and temperature on metmyoglobin reducing activity (MRA) of cooked ground beef patties and (2) to assess the effects of temperature and pH on thermal stability of NADH-dependent reductase, lactate dehydrogenase (LDH), and oxymyoglobin (OxyMb) in-vitro...
January 18, 2017: Journal of Food Science
https://www.readbyqxmd.com/read/28099225/the-performance-of-noncontrast-magnetic-resonance-angiography-in-detecting-renal-artery-stenosis-as-compared-with-contrast-enhanced-magnetic-resonance-angiography-using-conventional-angiography-as-a-reference
#3
Keng-Wei Liang, Jhih-Wei Chen, Hsin-Hui Huang, Chun-Hung Su, Yeu-Sheng Tyan, Teng-Fu Tsao
OBJECTIVE: The aims of this study were to evaluate the performance of noncontrast magnetic resonance angiography (NC MRA) for detecting renal artery stenosis (RAS) as compared with contrast-enhanced magnetic resonance angiography (CE MRA) and to evaluate the clinical feasibility, technical success rate, and performance of NC MRA for detecting RAS as compared with CE MRA. METHODS: Thirty-six subjects who underwent NC MRA and/or CE MRA were enrolled. Feasibility, technical success rate, and image quality scores were compared...
January 18, 2017: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/28098497/magnetic-resonance-arthrography-results-that-indicate-surgical-treatment-for-partial-articular-sided-supraspinatus-tendon-avulsion-a-retrospective-study-in-a-tertiary-center
#4
Seok Hahn, Young Han Lee, Yong-Min Chun, Eun Hae Park, Jin-Suck Suh
Background Specific findings on magnetic resonance arthrography (MRA) that indicate the need for surgery in patients with partial articular-sided supraspinatus tendon avulsion (PASTA) are not well understood. Purpose To determine which MRA findings are characteristic of patients who undergo surgery for PASTA. Material and Methods From July 2011 to February 2014, MRA findings for patients treated for PASTA were retrospectively reviewed. The patients were divided into two groups: conservative treatment and surgical repair...
January 1, 2017: Acta Radiologica
https://www.readbyqxmd.com/read/28097499/automating-perforator-flap-mra-and-cta-reporting
#5
Christopher J Lange, Nanda Deepa Thimmappa, Srikanth R Boddu, Silvina P Dutruel, Mengchao Pei, Zerwa Farooq, Ashkan Heshmatzadeh Behzadi, Yi Wang, Ramin Zabih, Martin R Prince
Surgical breast reconstruction after mastectomy requires precise perforator coordinates/dimensions, perforator course, and fat volume in a radiology report. Automatic perforator reporting software was implemented as an OsiriX Digital Imaging and Communications in Medicine (DICOM) viewer plugin. For perforator analysis, the user identifies a reference point (e.g., umbilicus) and marks each perforating artery/vein bundle with multiple region of interest (ROI) points along its course beginning at the muscle-fat interface...
January 17, 2017: Journal of Digital Imaging: the Official Journal of the Society for Computer Applications in Radiology
https://www.readbyqxmd.com/read/28089903/advances-in-mr-angiography-with-7t-mri-from-microvascular-imaging-to-functional-angiography
#6
Chan-A Park, Chang-Ki Kang, Young-Bo Kim, Zang-Hee Cho
Over the past few decades, vascular flow-dependent imaging techniques have proven to be effective for the visualization of large vessel diseases. However, these approaches are unlikely to be efficacious for small vessels because the affected small vessels cannot always be visualized directly, owing to a lack of detection sensitivity. Recently, many researchers have introduced state-of-the-art imaging techniques to visualize cerebral microvessels using ultra-high-field (UHF) magnetic resonance angiography (MRA)...
January 12, 2017: NeuroImage
https://www.readbyqxmd.com/read/28089760/enhanced-long-term-brain-mri-evaluation-of-children-with-sickle-cell-disease-following-hematopoietic-cell-transplantation
#7
Nancy S Green, Monica Bhatia, Erica Y Griffith, Mahvish Qureshi, Courtney Briamonte, Mirko Savone, Stephen Sands, Margaret T Lee, Angela Lignelli, Adam M Brickman
Progressive neurovasculopathy in children with sickle cell disease (SCD) results in decreased cognitive function and quality of life (QoL). Hematopoietic cell transplant (HCT) is believed to halt progression of neurovasculopathy. Quantitative analysis of T2-weighted fluid attenuated inversion recovery (FLAIR) MRI for white matter hyperintensity (WMH) burden provides a meaningful estimate of small vessel cerebrovascular disease. We asked if quantitative analysis of WMH could complement standardized clinical assessment of MRI/MRA for assessing SCD CNS vasculopathy pre- and post-HCT...
January 9, 2017: Biology of Blood and Marrow Transplantation
https://www.readbyqxmd.com/read/28087688/thirty-years-of-evidence-on-the-efficacy-of-drug-treatments-for-chronic-heart-failure-with-reduced-ejection-fraction-a-network-meta-analysis
#8
Heather Burnett, Amy Earley, Adriaan A Voors, Michele Senni, John J V McMurray, Celine Deschaseaux, Shannon Cope
BACKGROUND: Treatments that reduce mortality and morbidity in patients with heart failure with reduced ejection fraction, including angiotensin-converting enzyme inhibitors (ACEI), angiotensin receptor blockers (ARB), β-blockers (BB), mineralocorticoid receptor antagonists (MRA), and angiotensin receptor-neprilysin inhibitors (ARNI), have not been studied in a head-to-head fashion. This network meta-analysis aimed to compare the efficacy of these drugs and their combinations regarding all-cause mortality in patients with heart failure with reduced ejection fraction...
January 2017: Circulation. Heart Failure
https://www.readbyqxmd.com/read/28079395/diagnostic-performance-of-wrist-magnetic-resonance-mr-arthrography-comparison-of-three-dimensional-isotropic-t1-weighted-fast-spin-echo-mr-arthrography-and-two-dimensional-mr-arthrography
#9
Eunsun Oh, Young Cheol Yoon, Min Jong Park
OBJECTIVES: To compare the diagnostic performance of wrist direct magnetic resonance arthrography (D-MRA) with 2D T1-weighted fast spin-echo (FSE) and 3D isotropic T1-weighted FSE sequences for detecting triangular fibrocartilage (TFC) central perforations and scapholunate ligament (SLL) and lunotriquetral ligament (LTL) tears. METHODS: Twenty-six patients who had undergone preoperative wrist D-MRA with 2D and 3D isotropic T1-weighted FSE sequences and subsequent arthroscopic surgeries were included...
January 12, 2017: British Journal of Radiology
https://www.readbyqxmd.com/read/28075625/unenhanced-and-contrast-enhanced-mr-angiography-and-perfusion-imaging-for-suspected-pulmonary-thromboembolism
#10
Yoshiharu Ohno, Takeshi Yoshikawa, Yuji Kishida, Shinichiro Seki, Nevzat Karabulut
OBJECTIVE: This article discusses the basics of unenhanced MR angiography (MRA) and MR venography (MRV), time-resolved contrast-enhanced (CE) MRA and dynamic first-pass CE perfusion MRI, and unenhanced and CE MRV, in addition to assessing the clinical relevance of these techniques for evaluating patients with suspected pulmonary thromboembolism and deep venous thrombosis. CONCLUSION: Since the 1990s, the efficacy of MRA or MRV and dynamic perfusion MRI for patients with suspected pulmonary thromboembolism and deep venous thrombosis has been evaluated...
January 11, 2017: AJR. American Journal of Roentgenology
https://www.readbyqxmd.com/read/28073850/characterization-of-mineralocorticoid-receptor-antagonist-therapy-initiation-in-high-risk-patients-with-heart-failure
#11
Lauren B Cooper, Bradley G Hammill, Eric D Peterson, Bertram Pitt, Matthew L Maciejewski, Lesley H Curtis, Adrian F Hernandez
BACKGROUND: Heart failure guidelines recommend routine monitoring of serum potassium, and renal function in patients treated with a mineralocorticoid receptor antagonist (MRA). How these recommendations are implemented in high-risk patients or according to setting of drug initiation is poorly characterized. METHODS AND RESULTS: We conducted a retrospective cohort study of Medicare beneficiaries linked to laboratory data in 10 states with prevalent heart failure as of July 1, 2011, and incident MRA use between May 1 and September 30, 2011...
January 2017: Circulation. Cardiovascular Quality and Outcomes
https://www.readbyqxmd.com/read/28071288/vulnerable-carotid-plaque-imaging-and-histopathology-without-a-dedicated-mri-receiver-coil
#12
Laura A Fitzpatrick, Nadav Berkovitz, Marlise P Dos Santos, Nevin Majeed, Rafael Glikstein, Santanu Chakraborty, John P Veinot, Grant Stotts, Alain Berthiaume, Robert Chatelain
Stroke is associated with vulnerable carotid artery plaques showing specific histopathologic features, namely a lipid-rich necrotic core, intraplaque hemorrhage, ulceration, and thin fibrous cap. While ultrasound and computed tomography (CT) can identify carotid plaques and determine the extent of stenosis, magnetic resonance imaging (MRI) provides further information regarding plaque composition and morphology. In this feasibility study, three patients with symptomatic, moderately stenosed plaques were imaged with CT angiography (CTA) and MRI (3T and 1...
January 1, 2017: Neuroradiology Journal
https://www.readbyqxmd.com/read/28062142/aldosterone-pathway-blockade-to-prevent-atrial-fibrillation-a-systematic-review-and-meta-analysis
#13
J Neefs, N W E van den Berg, J Limpens, W R Berger, S M Boekholdt, P Sanders, J R de Groot
BACKGROUND: Despite advances in therapeutic interventions AF remains a progressive and symptomatic disease. Therefore, novel therapeutic interventions targeting the underlying arrhythmogenic substrate for AF is needed. Atrial fibrosis is an important component of the arrhythmogenic substrate of AF and may be initiated by aldosterone binding to the mineralocorticoid receptor. We hypothesized that aldosterone pathway blockade with mineralocorticoid receptor antagonists (MRA) reduces atrial fibrosis, and thus AF...
December 23, 2016: International Journal of Cardiology
https://www.readbyqxmd.com/read/28061379/assessment-of-the-non-gaussianity-and-non-linearity-levels-of-simulated-semg-signals-on-stationary-segments
#14
Noureddine Messaoudi, Raïs El'hadi Bekka, Philippe Ravier, Rachid Harba
The purpose of this paper was to evaluate the effects of the longitudinal single differential (LSD), the longitudinal double differential (LDD) and the normal double differential (NDD) spatial filters, the electrode shape, the inter-electrode distance (IED) on non-Gaussianity and non-linearity levels of simulated surface EMG (sEMG) signals when the maximum voluntary contraction (MVC) varied from 10% to 100% by a step of 10%. The effects of recruitment range thresholds (RR), the firing rate (FR) strategy and the peak firing rate (PFR) of motor units were also considered...
December 25, 2016: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28057413/upper-extremity-blood-pressure-difference-in-patients-undergoing-carotid-revascularisation
#15
A Huibers, J Hendrikse, M M Brown, S A Pegge, M Arnold, F L Moll, L J Kapelle, G J de Borst
INTRODUCTION: Blood pressure (BP) regulation is important in patients with carotid artery atherosclerotic disease. Concomitant subclavian artery stenosis (SAS) might lead to an underestimation of the true systemic BP in the monitoring of these patients. This study aimed to assess the prevalence of the inter-arm BP difference in patients undergoing carotid intervention and its association with ipsilateral significant subclavian stenosis and clinical outcome. METHODS: Bilateral BP measurements and vascular imaging (CTA and MRA) of both subclavian arteries and the innominate artery were assessed in 182 symptomatic patients with carotid artery stenosis undergoing revascularisation in the International Carotid Stenting Study (ICSS)...
January 2, 2017: European Journal of Vascular and Endovascular Surgery
https://www.readbyqxmd.com/read/28056282/-diagnostic-value-of-clot-burden-score-of-susceptibility-vessel-sign-in-arterial-thrombosis-of-acute-ischemic-stroke-and-its-association-with-prognosis
#16
Y Huang, W L Mei, H Q Liu, Y L Li, Z Z Chen, D D Li, J W Zhang
Objective: To analysis the value of susceptibility vessel sign (SVS) in susceptibility weighted imaging (SWI) in detecting thrombogenesis in middle cerebral artery (MCA) and its association with clinical prognosis. Methods: From December 2014 to December 2015 in People's Hospital of Zhengzhou University, we retrospectively examined clinical, imaging and experimental datafrom 104 consecutive patients with acute ischemic strokeand compared the consistency of detecting thrombus between SWI and magnetic resonance angiography (MRA) using Kappa analysis...
January 3, 2017: Zhonghua Yi Xue za Zhi [Chinese medical journal]
https://www.readbyqxmd.com/read/28052565/cerebral-hemodynamics-and-pseudo-continuous-arterial-spin-labeling-considerations-in-adults-with-sickle-cell-anemia
#17
Meher R Juttukonda, Lori C Jordan, Melissa C Gindville, Larry T Davis, Jennifer M Watchmaker, Sumit Pruthi, Manus J Donahue
Sickle cell anemia (SCA) is a genetic disorder resulting in reduced oxygen carrying capacity and elevated stroke risk. Pseudo-continuous arterial spin labeling (pCASL) measures of cerebral blood flow (CBF) may have relevance for stroke risk assessment; however, the effects of elevated flow velocity and reduced bolus arrival time (BAT) on CBF quantification in SCA patients have not been thoroughly characterized, and pCASL model parameters used in healthy adults are often applied to patients with SCA. Here, cervical arterial flow velocities and pCASL labeling efficiencies were computed in adults with SCA (n = 19) and age- and race-matched controls without sickle trait (n = 7) using pCASL in sequence with phase contrast MR angiography (MRA)...
January 4, 2017: NMR in Biomedicine
https://www.readbyqxmd.com/read/28050631/head-to-head-comparison-between-18-f-fdopa-pet-ct-and-mr-ct-angiography-in-clinically-recurrent-head-and-neck-paragangliomas
#18
Céline Heimburger, Francis Veillon, David Taïeb, Bernard Goichot, Sophie Riehm, Julie Petit-Thomas, Gerlinde Averous, Marcela Cavalcanti, Fabrice Hubelé, Gerard Chabrier, Izzie Jacques Namer, Anne Charpiot, Alessio Imperiale
PURPOSE: Head and neck paragangliomas (HNPGLs) can relapse after primary treatment. Optimal imaging protocols have not yet been established for posttreatment evaluation. The aim of the present study was to assess the diagnostic value of (18)F-FDOPA PET/CT and MR/CT angiography (MRA/CTA) in HNPGL patients with clinical relapse during their follow-up. METHODS: Sixteen consecutive patients presenting with local pain, tinnitus, dysphagia, hoarse voice, cranial nerve involvement, deafness, or retrotympanic mass appearing during follow-up after the initial treatment of HNPGLs were retrospectively evaluated...
January 3, 2017: European Journal of Nuclear Medicine and Molecular Imaging
https://www.readbyqxmd.com/read/28049199/systemic-atherosclerosis-relate-to-brain-arterial-diameters-the-northern-manhattan-study
#19
Jose Gutierrez, Tatjana Rundek, Ken Cheung, Ahmet Bagci, Noam Alperin, Ralph L Sacco, Clinton B Wright, Mitchell S V Elkind, Marco R Di Tullio
BACKGROUND: Phenotypic expressions of arterial disease vary throughout the body and it is not clear to what extent systemic atherosclerosis influences brain arterial remodeling. We aim to test the hypothesis that systemic atherosclerosis is associated with brain arterial diameters. METHODS: Stroke-free participants in the Northern Manhattan Study MRI subcohort in whom carotid ultrasound, transthoracic echocardiogram, and brain MRA (n = 482) were performed were included in this analysis...
January 4, 2017: Cerebrovascular Diseases
https://www.readbyqxmd.com/read/28047653/th-cd-206-11-an-ellipsoid-convex-enhancement-filter-based-computer-aided-diagnostic-framework-of-intracranial-aneurysms-in-mra-images
#20
Z Jin, H Arimura, S Kakeda, F Yamashita, M Sasaki, Y Korogi
PURPOSE: For early detections of asymptomatic intracranial aneurysms, computer aided diagnostic (CAD) frameworks of intracranial aneurysms in magnetic resonance angiography (MRA) images were developed with various enhancement filters. However, discrimination between aneurysms and false positive structures, such as bending or branching portions of vessels could still be a challenging task for the enhancement filters. Therefore, we focused on developing an ellipsoid convex enhancement (ECE) filter based CAD framework, which is capable of enhancing aneurysms while reducing the effect on bending and branching portions of vessels, for detection of intracranial aneurysm candidate...
June 2016: Medical Physics
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