keyword
MENU ▼
Read by QxMD icon Read
search

Cardiac MRI

keyword
https://www.readbyqxmd.com/read/29677060/cerebral-small-vessel-but-not-large-vessel-disease-is-associated-with-impaired-cerebral-autoregulation-during-cardiopulmonary-bypass-a-retrospective-cohort-study
#1
Yohei Nomura, Roland Faegle, Daijiro Hori, Abbas Al-Qamari, Alexander J Nemeth, Rebecca Gottesman, Gayane Yenokyan, Charles Brown, Charles W Hogue
BACKGROUND: Impaired cerebral blood flow (CBF) autoregulation during cardiopulmonary bypass (CPB) is associated with stroke and other adverse outcomes. Large and small arterial stenosis is prevalent in patients undergoing cardiac surgery. We hypothesize that large and/or small vessel cerebral arterial disease is associated with impaired cerebral autoregulation during CPB. METHODS: A retrospective cohort analysis of data from 346 patients undergoing cardiac surgery with CPB enrolled in an ongoing prospectively randomized clinical trial of autoregulation monitoring were evaluated...
April 17, 2018: Anesthesia and Analgesia
https://www.readbyqxmd.com/read/29675440/multi-velocity-encoding-four-dimensional-flow-magnetic-resonance-imaging-in-the-assessment-of-chronic-aortic-dissection
#2
Andrew G Sherrah, Fraser M Callaghan, Rajesh Puranik, Richmond W Jeremy, Paul G Bannon, Michael P Vallely, Stuart M Grieve
Background: Chronic descending thoracic aortic dissection (CDTAD) following surgical repair of ascending aortic dissection requires long-term imaging surveillance. We investigated four-dimensional (4D)-flow magnetic resonance imaging (MRI) with a novel multi-velocity encoding (multi-VENC) technique as an emerging clinical method enabling the dynamic quantification of blood volume and velocity throughout the cardiac cycle. Methods: Patients with CDTAD (n = 10; mean age, 55...
June 2017: Aorta (Stamford, Conn.)
https://www.readbyqxmd.com/read/29674616/quantifying-mri-frequency-shifts-due-to-structures-with-anisotropic-magnetic-susceptibility-using-pyrolytic-graphite-sheet
#3
Matthew J Cronin, Richard Bowtell
Magnetic susceptibility is an important source of contrast in magnetic resonance imaging (MRI), with spatial variations in the susceptibility of tissue affecting both the magnitude and phase of the measured signals. This contrast has generally been interpreted by assuming that tissues have isotropic magnetic susceptibility, but recent work has shown that the anisotropic magnetic susceptibility of ordered biological tissues, such as myelinated nerves and cardiac muscle fibers, gives rise to unexpected image contrast...
April 19, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29674325/adenylate-cyclase-type-9-adcy9-inactivation-protects-from-atherosclerosis-only-in-the-absence-of-cholesteryl-ester-transfer-protein-cetp
#4
Yohann Rautureau, Vanessa Deschambault, Marie-Ève Higgins, Daniel Rivas, Mélanie Mecteau, Pascale Geoffroy, Géraldine Miquel, Kurunradeth Uy, Rocio Sanchez, Véronique Lavoie, Geneviève Brand, Audrey Nault, Pierre-Marc Williams, Maria Laura Suarez, Nolwenn Merlet, Line Lapointe, Natacha Duquette, Marc-Antoine Gillis, Samaneh Samami, Gaétan Mayer, Philippe Pouliot, Adeline Raignault, Foued Maafi, Mathieu R Brodeur, Sylvie Levesque, Marie-Claude Guertin, Marie-Pierre Dubé, Éric Thorin, David Rhainds, Éric Rhéaume, Jean-Claude Tardif
Background -Pharmacogenomic studies have shown that ADCY9 genotype determines the effects of the cholesteryl ester transfer protein (CETP) inhibitor dalcetrapib on cardiovascular events and atherosclerosis imaging. The underlying mechanisms responsible for the interactions between ADCY9 and CETP activity have not yet been determined. Methods - Adcy9 -inactivated ( Adcy9 Gt/Gt ) and wild-type (WT) mice, that were or not transgenic for the CETP gene (CETPtg Adcy9 Gt/Gt and CETPtg Adcy9 WT ), were submitted to an atherogenic protocol (injection of an AAV8 expressing a PCSK9 gain-of-function variant and 0...
April 19, 2018: Circulation
https://www.readbyqxmd.com/read/29673936/comparison-between-a-generalized-newtonian-model-and-a-network-type-multiscale-model-for-hemodynamic-behavior-in-the-aortic-arch-validation-with-4d-mri-data-for-a-case-study
#5
Marine Menut, Loïc Boussel, Xavier Escriva, Benyebka Bou-Saïd, Hélène Walter-Le Berre, Yann Marchesse, Antoine Millon, Nellie Della Schiava, Patrick Lermusiaux, John Tichy
Blood is a complex fluid in which the presence of the various constituents leads to significant changes in its rheological properties. Thus, an appropriate non-Newtonian model is advisable; and we choose a Modified version of the rheological model of Phan-Thien and Tanner (MPTT). The different parameters of this model, derived from the rheology of polymers, allow characterization of the non-Newtonian nature of blood, taking into account the behavior of red blood cells in plasma. Using the MPTT model that we implemented in the open access software OpenFOAM, numerical simulations have been performed on blood flow in the thoracic aorta for a healthy patient...
March 29, 2018: Journal of Biomechanics
https://www.readbyqxmd.com/read/29672672/mri-and-neuropsychological-correlates-in-african-americans-with-hypertension-and-left-ventricular-hypertrophy
#6
B Waldron-Perrine, J E Kisser, A Brody, E M Haacke, R Dawood, S Millis, P Levy
Background: African Americans (AA) are at high risk for hypertension (HTN) and poor blood pressure (BP) control. Persistently elevated BP contributes to cardiovascular morbidity. White matter hyperintensities (WMH) are a definable magnetic resonance imaging (MRI) marker of cerebrovascular injury linked to impairments in higher level thinking (i.e., executive functions), memory formation and speed of perceptual-motor processing. Methods: This sub-investigation evaluated neuropsychological functioning in association with WMH on brain MRIs in 23 otherwise healthy hypertensive AAs participating in an NIH-funded study of the effects of Vitamin D on BP and cardiac remodeling in AA patients 30-74 years of age with HTN and left ventricular hypertrophy...
April 17, 2018: American Journal of Hypertension
https://www.readbyqxmd.com/read/29667078/impact-of-different-coarctation-therapies-on-aortic-stiffness-phase-contrast-mri-study
#7
Michal Schäfer, Gareth J Morgan, Max B Mitchell, Michael Ross, Alex J Barker, Kendall S Hunter, Brian Fonseca, Michael DiMaria, Daniel Vargas, D Dunbar Ivy, Neil Wilson, Lorna P Browne
Coarctation of the aorta has been associated with increased thoracic aortic stiffness in adolescents and young adults. However, the effects of different therapeutic strategies on aortic stiffness in a young population is unknown. This study aimed to non-invasively assess aortic stiffness between different repair or intervention strategies in patients with coarctation of the aorta. Forty-nine coarctation patients who underwent either surgery (n = 26), balloon angioplasty (n = 14), or stent implantation (n = 12), and 26 age- and size-matched normotensive healthy controls underwent evaluation of thoracic aortic stiffness and flow hemodynamics via phase-contrast cardiac magnetic resonance...
April 17, 2018: International Journal of Cardiovascular Imaging
https://www.readbyqxmd.com/read/29666031/measurement-of-left-atrial-volume-by-2d-and-3d-non-contrast-computed-tomography-compared-with-cardiac-magnetic-resonance-imaging
#8
Maise Høigaard Fredgart, Rasmus Carter-Storch, Jacob Eifer Møller, Kristian Altern Øvrehus, Redi Pecini, Jordi Sanchez Dahl, Oke Gerke, Roudyna Ahmad Alturkmany, Axel Brandes, Jes Sanddal Lindholt, Axel Cosmus Pyndt Diederichsen
BACKGROUND: Cardiac magnetic resonance imaging (MRI) is considered the gold standard for assessment of left atrial (LA) volume. We assessed the feasibility of evaluating LA volume using 3D non-contrast computed tomography (NCCT). Furthermore, since manual tracing of LA volume is time consuming, we evaluated the accuracy of the LA area using 2D NCCT imaging for LA volume assessment. METHODS: MRI and NCCT imaging were performed in 69 patients before and one year after aortic valve replacement...
April 10, 2018: Journal of Cardiovascular Computed Tomography
https://www.readbyqxmd.com/read/29663861/amyloid-cardiomyopathy-a-hidden-heart-failure-cause-that-is-often-misdiagnosed
#9
Yale Tung-Chen, Miguel-Ángel Arnau
BACKGROUND: Congestive heart failure (CHF) is a very common condition, especially in the elderly, characterized by dyspnea, orthopnea, nocturnal paroxysmal dyspnea, and peripheral edema. CLINICAL PRESENTATION AND INTERVENTION: We report the case of a 76-year-old with CHF symptoms for the last 3 months. The ECG and transthoracic echocardiogram were suggestive of CHF due to amyloid cardiomyopathy. After cardiac MRI, a positive Congo red staining of subcutaneous fat aspiration and a negative genetic testing for mutant transthyretin, senile amyloid cardiomyopathy (ATTRw) was expected...
April 17, 2018: Acta Clinica Belgica
https://www.readbyqxmd.com/read/29663858/assessment-of-liver-and-cardiac-iron-overload-using-mri-in-patients-with-chronic-anemias-in-latin-american-countries-results-from-asimila-study
#10
Rodolfo Cancado, Nora P Watman, Clarisse Lobo, Zulay Chona, Fernando Manzur, Fabiola Traina, Miriam Park, Guillermo Drelichman, Juan Pablo Zarate, Luis Marfil
OBJECTIVES: A multicenter, noninterventional, observational study was conducted in the Latin American countries including Argentina, Brazil, Colombia, Mexico, and Venezuela to assess the prevalence of liver and cardiac iron overload using magnetic resonance imaging (MRI) in patients with chronic anemias except thalassemia. METHODS: Patients aged >10 years with transfusion-dependent anemias, except thalassemia, either with <20 units of red blood cell (RBC) transfusions with serum ferritin (SF) levels >2000 ng/mL or with ≥20 units of RBC transfusions regardless of SF level in their lifetime, were enrolled...
April 17, 2018: Hematology (Amsterdam, Netherlands)
https://www.readbyqxmd.com/read/29663188/magnetic-resonance-imaging-during-management-of-patients-with-transfusion-dependent-thalassemia-a-single-center-experience
#11
Zeynep Karakas, Yasin Yilmaz, Zuhal Bayramoglu, Serap Karaman, Selime Aydogdu, Ayse Ozkan Karagenc, Deniz Tugcu, Memduh Dursun
BACKGROUND: Cardiac and hepatic magnetic resonance imaging evaluation during treatment can tailor physicians' chelation therapy titrations. AIM: The aim of the study was to assess the relationship of cardiac and hepatic T2* values with chelation therapy in patients with transfusion-dependent thalassemia (TDT). METHODS: A total of 106 patients with TDT who were followed up in Istanbul Medical Faculty Thalassemia Center were evaluated for the study...
April 16, 2018: La Radiologia Medica
https://www.readbyqxmd.com/read/29660944/cardiovascular-response-to-mental-stress-in-mild-cognitive-impairment-and-its-association-with-cerebral-perfusion
#12
Brandon C Henley, Mahsa Shokouhi, Anushree Y Mahajan, Omer T Inan, Ihab Hajjar
Mental stress has been linked to various chronic diseases including Alzheimer's disease, but the mechanisms underlying cognitive decline with mental stress are unknown. Reduced cardiovascular response to stress is associated with cardiovascular disease, and the latter is associated with cognitive impairment. We measured electrodermal activity, blood pressure, and cardiac hemodynamics in cognitively normal and mild cognitive impairment (MCI) adults (n = 76, mean age = 58 years, 46% MCI) during rest, a math test, and face-name recall tasks to derive the following cardiovascular indicators: mean arterial pressure, heart rate, stroke volume and cardiac output...
April 11, 2018: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/29657080/right-ventricular-energetics-and-power-in-pulmonary-regurgitation-vs-stenosis-using-four-dimensional-phase-contrast-magnetic-resonance
#13
Joao Filipe Fernandes, James M Hammel, Jia Zhou, Yunbin Xiao, Manuela Chen, Rita Alves, John Lof, Stuart M Grieve, Andreas Schuster, Titus Kuehne, Shelby Kutty
OBJECTIVE: We investigated a full energetic profile of pressure and volume loaded right ventricle (RV) in porcine models by evaluating kinetic energy (KE), stroke power, power output and power loss across pulmonary valves with stenosis (PS) or with regurgitation (PR). METHODS: Fifteen pigs (6 PS and 6 PR, 3 unoperated controls) were studied. Phase-contrast 4D-flow MRI was performed in models of PS and PR at baseline and at 10-12 weeks, in conjunction with cardiac catheterization...
April 4, 2018: International Journal of Cardiology
https://www.readbyqxmd.com/read/29656011/apoe-genotype-modifies-the-association-between-central-arterial-stiffening-and-cognition-in-older-adults
#14
Francis E Cambronero, Dandan Liu, Jacquelyn E Neal, Elizabeth E Moore, Katherine A Gifford, James G Terry, Sangeeta Nair, Kimberly R Pechman, Katie E Osborn, Timothy J Hohman, Susan P Bell, J David Sweatt, Thomas J Wang, Joshua A Beckman, John Jeffrey Carr, Angela L Jefferson
Arterial stiffening is associated with cognitive impairment and prodromal Alzheimer's disease. This study tested the interaction between arterial stiffening and an Alzheimer's disease genetic risk factor (apolipoprotein E [APOE] genotype) on cognition among older adults. Vanderbilt Memory & Aging Project participants with normal cognition (n = 162, 72 ± 7 years, 29% APOE-ε4 carrier) and mild cognitive impairment (n = 121, 73 ± 8 years, 42% APOE-ε4 carrier) completed neuropsychological assessment and cardiac MRI to assess aortic stiffening using pulse wave velocity (PWV, m/s)...
February 20, 2018: Neurobiology of Aging
https://www.readbyqxmd.com/read/29652661/combined-brain-and-heart-magnetic-resonance-imaging-in-systemic-vasculitides-fiction-or-real-need
#15
REVIEW
Sophie I Mavrogeni, George Kitas, Hildo J Lamb, Klearchos Psychoyios, Theodoros Dimitroulas, Loukia Koutsogeorgopoulou, Kyriaki Boki, Vasiliki Vartela, Genovefa Kolovou, George Markousis-Mavrogenis, Cees G Kallenberg, Loic Guillevin, Dimitrios Vassilopoulos
Systemic vasculitides (SVs) is a group of diseases characterised by inflammation/necrosis of the blood vessel wall in various organs. Simultaneous brain and heart involvement is a cause of increased morbidity/mortality in SV. We aimed to present evidence of concurrent brain/heart involvement in SV and the role of a combined brain/heart magnetic resonance imaging (MRI) in their risk stratification. Cerebral vasculitis (CV) can be presented as focal deficits, seizures, headache, neuropsychiatric manifestations or cognitive dysfunction and cardiovascular disease (CVD) as myocardial/vascular inflammation, perfusion/function defects and fibrosis...
April 10, 2018: Clinical and Experimental Rheumatology
https://www.readbyqxmd.com/read/29651605/diagnostic-role-of-strain-imaging-in-atypical-myocarditis-by-echocardiography-and-cardiac-mri
#16
Bethany L Wisotzkey, Brian D Soriano, Erin L Albers, Mark Ferguson, Sujatha Buddhe
BACKGROUND: The diagnosis of myocarditis presenting as isolated acute chest pain with elevated troponins but normal systolic function is challenging with significant drawbacks even for the gold-standard endomyocardial biopsy. OBJECTIVE: This study aimed to evaluate the diagnostic role of strain imaging by echocardiography and cardiac MRI in these patients. MATERIALS AND METHODS: This was a retrospective review of children with cardiac MRI for acute chest pain with elevated troponins compared to normal controls...
April 13, 2018: Pediatric Radiology
https://www.readbyqxmd.com/read/29651017/effects-of-different-doses-of-granulocyte-colony-stimulating-factor-mobilization-therapy-on-ischemic-cardiomyopathy
#17
Rongchong Huang, Haichen Lv, Kang Yao, Lei Ge, Zhishuai Ye, Huaiyu Ding, Yiqi Zhang, Hao Lu, Zheyong Huang, Shuning Zhang, Yunzeng Zou, Junbo Ge
G-CSF mobilization might be beneficial to ICM, but the relationship between effect/safety and the dosage of G-CSF remains unclear. In this study, 24 pigs were used to build ICM models and were randomized into four groups. Four weeks later, different dosages of G-CSF were given daily by subcutaneous injection for 5 days. Another 4 weeks later, all the animals were sacrificed. Electrocardiography, coronary arteriography, left ventriculography, transthoracic echocardiography, cardiac MRI, and SPECT, histopathologic analysis, and immunohistochemistry techniques were used to evaluate left ventricular function and myocardial infarct size...
April 12, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29629931/magnetic-resonance-imaging-in-neurocritically-ill-patients-who-fails-and-how
#18
Joong-Goo Kim, Myung-Ah Ko, Han-Bin Lee, Sang-Beom Jeon
OBJECTIVES: Performing magnetic resonance imaging (MRI) in neurocritically ill patients is challenging because it often requires sedation and withholding care in the neurological intensive care unit. This study investigated the incidence of and reasons for failed or complicated MRI (MRI-FC) in such patients. METHODS: A consecutive series of 218 neurocritically ill patients who underwent brain MRI were retrospectively evaluated. Failed or complicated MRI included failure to obtain all ordered sequences, unscheduled sedative administration, decrease in oxygen saturation to less than 90%, hypotension (≥40-mm Hg decrease and/or use of inotropic agents), and cardiac or respiratory arrest...
April 6, 2018: Journal of Patient Safety
https://www.readbyqxmd.com/read/29627630/awake-intradural-spinal-tumour-resection
#19
Anan Shtaya, Chan Bao Luong, Erlick Pereira
BACKGROUND: Meningioma is a common slow growing spinal tumour with a predilection for intradural occurrence. Patients usually present with pain followed by ataxia and sensory and sphincter problems. The gold standard treatment in these cases is gross total microsurgical resection under general anaesthesia. However, there exist high anaesthetic risk patients unsuitable for general anaesthesia. Performing spinal surgeries under local anaesthesia and sedation has been reported albeit rarely for mostly minimally invasive procedures but not for open intradural pathologies...
April 5, 2018: World Neurosurgery
https://www.readbyqxmd.com/read/29627015/spinal-cord-infarction-clinical-and-imaging-insights-from-the-periprocedural-setting
#20
Nicholas L Zalewski, Alejandro A Rabinstein, Karl N Krecke, Robert D Brown, Eelco F M Wijdicks, Brian G Weinshenker, Derrick A Doolittle, Eoin P Flanagan
OBJECTIVE: Describe the range of procedures associated with spinal cord infarction (SCI) as a complication of a medical/surgical procedure and define clinical and imaging characteristics that could be applied to help diagnose spontaneous SCI, where the diagnosis is often less secure. METHODS: We used an institution-based search tool to identify patients evaluated at Mayo Clinic, Rochester, MN from 1997 to 2016 with a periprocedural SCI. We performed a descriptive analysis of clinical features, MRI and other laboratory findings, and outcome...
May 15, 2018: Journal of the Neurological Sciences
keyword
keyword
1557
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"