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Cardiac MRI

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https://www.readbyqxmd.com/read/28212177/neurocognitive-outcomes-for-acute-global-acquired-brain-injury-in-children
#1
Fenella J Kirkham
PURPOSE OF REVIEW: In children, acute global brain injury from traumatic brain injury (TBI) and nontraumatic coma has a substantial cost to the child, the family, and the society. There have historically been relatively few studies looking at long-term cognition and behavioural outcomes. RECENT FINDINGS: Long-term follow-up studies, population-based studies, and meta-analyses are now available for TBI in children as well as adults and suggest that there is a significant cognitive cost, particularly for processing speed, working memory, and intelligence quotient (IQ) in severe TBI...
February 15, 2017: Current Opinion in Neurology
https://www.readbyqxmd.com/read/28210769/preprocedural-risk-assessment-prior-to-ppvi-with-cmr-and-cardiac-ct
#2
Ladonna Malone, Brian Fonseca, Thomas Fagan, Jane Gralla, Neil Wilson, Micheal DiMaria, Uyen Truong, Lorna P Browne
Percutaneous pulmonary valve intervention (PPVI) is a less invasive and less costly approach to pulmonary valve replacement compared with the surgical alternative. Potential complications of PPVI include coronary compression and pulmonary arterial injury/rupture. The purpose of this study was to characterize the morphological risk factors for PPVI complication with cardiac MRI and cardiac CTA. A retrospective review of 88 PPVI procedures was performed. 44 patients had preprocedural cardiac MRIs or CTAs available for review...
February 16, 2017: Pediatric Cardiology
https://www.readbyqxmd.com/read/28205347/robust-universal-nonrigid-motion-correction-framework-for-first-pass-cardiac-mr-perfusion-imaging
#3
Mitchel Benovoy, Matthew Jacobs, Farida Cheriet, Nagib Dahdah, Andrew E Arai, Li-Yueh Hsu
PURPOSE: To present and assess an automatic nonrigid image registration framework that compensates motion in cardiac magnetic resonance imaging (MRI) perfusion series and auxiliary images acquired under a wide range of conditions to facilitate myocardial perfusion quantification. MATERIALS AND METHODS: Our framework combines discrete feature matching for large displacement estimation with a dense variational optical flow formulation in a multithreaded architecture...
February 15, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28205298/automatic-segmentation-of-the-right-ventricle-from-cardiac-mri-using-a-learning-based-approach
#4
Michael R Avendi, Arash Kheradvar, Hamid Jafarkhani
PURPOSE: This study aims to accurately segment the right ventricle (RV) from cardiac MRI using a fully automatic learning-based method. METHODS: The proposed method uses deep learning algorithms, i.e., convolutional neural networks and stacked autoencoders, for automatic detection and initial segmentation of the RV chamber. The initial segmentation is then combined with the deformable models to improve the accuracy and robustness of the process. We trained our algorithm using 16 cardiac MRI datasets of the MICCAI 2012 RV Segmentation Challenge database and validated our technique using the rest of the dataset (32 subjects)...
February 16, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28199043/diagnostic-performance-of-t1-and-t2-mapping-to-detect-intramyocardial-hemorrhage-in-reperfused-st-segment-elevation-myocardial-infarction-stemi-patients
#5
Heerajnarain Bulluck, Stefania Rosmini, Amna Abdel-Gadir, Anish N Bhuva, Thomas A Treibel, Marianna Fontana, Esther Gonzalez-Lopez, Manish Ramlall, Ashraf Hamarneh, Alex Sirker, Anna S Herrey, Charlotte Manisty, Derek M Yellon, James C Moon, Derek J Hausenloy
PURPOSE: To investigate the performance of T1 and T2 mapping to detect intramyocardial hemorrhage (IMH) in ST-segment elevation myocardial infarction (STEMI) patients treated by primary percutaneous coronary intervention (PPCI). MATERIALS AND METHODS: Fifty STEMI patients were prospectively recruited between August 2013 and July 2014 following informed consent. Forty-eight patients completed a 1.5T cardiac magnetic resonance imaging (MRI) with native T1 , T2 , and T2* maps at 4 ± 2 days...
February 15, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28196967/coxsackie-myocarditis-and-hepatitis-with-reactivated-epstein-bar-virus-ebv-a-case-report
#6
Varunsiri Atti, Nathan M Anderson, Mathew B Day
BACKGROUND Myocarditis, defined as inflammation of myocardial tissue of the heart, is an uncommon cardiac presentation and is due to a variety of causes. It affects 1% of the US population, 50% of which is caused by coxsackie B virus. Cardiac tissue is the prime target, and destruction of myocardium results in cardiac failure with fluid overload. CASE REPORT Our patient was a 57-year-old woman with fever, headache, neck pain, and generalized malaise. Her white blood cell count was 13×10³ cells/mm³. Interestingly, lumbar puncture ruled out meningitis...
February 15, 2017: American Journal of Case Reports
https://www.readbyqxmd.com/read/28195684/extended-rf-shimming-sequence-level-parallel-transmission-optimization-applied-to-steady-state-free-precession-mri-of-the-heart
#7
Arian Beqiri, Anthony N Price, Francesco Padormo, Joseph V Hajnal, Shaihan J Malik
Cardiac magnetic resonance imaging (MRI) at high field presents challenges because of the high specific absorption rate and significant transmit field (B1(+) ) inhomogeneities. Parallel transmission MRI offers the ability to correct for both issues at the level of individual radiofrequency (RF) pulses, but must operate within strict hardware and safety constraints. The constraints are themselves affected by sequence parameters, such as the RF pulse duration and TR, meaning that an overall optimal operating point exists for a given sequence...
February 14, 2017: NMR in Biomedicine
https://www.readbyqxmd.com/read/28194732/late-post-avr-progression-of-bicuspid-aortopathy-link-to-hemodynamics
#8
Shiho Naito, Tatiana Gross, Kushtrim Disha, Yskert von Kodolitsch, Hermann Reichenspurner, Evaldas Girdauskas
BACKGROUND AND AIM OF THE STUDY: The ascending aortic dilatation may progress after aortic valve replacement (AVR) in bicuspid aortic valve (BAV) patients. Our aim was to evaluate rheological flow patterns and histological characteristics of the aneurysmal aorta in BAV patients at the time of reoperative aortic surgery. MATERIALS AND METHODS: 13 patients (mean age: 42 ± 9 years, 10 (77%) male) with significant progression of proximal aortopathy after isolated AVR surgery for BAV disease (i...
February 13, 2017: General Thoracic and Cardiovascular Surgery
https://www.readbyqxmd.com/read/28192862/long-term-dietary-quercetin-enrichment-as-a-cardioprotective-countermeasure-in-mdx-mice
#9
Christopher Ballmann, Thomas Denney, Ronald J Beyers, Tiffany Quindry, Matthew Romero, Joshua T Selsby, John C Quindry
Duchenne Muscular Dystrophy (DMD) causes declines in cardiac health resulting in premature mortality. As a potential countermeasure, quercetin is a polyphenol possessing inherent anti-inflammatory and antioxidant effects that activate proliferator-activated γ coactivator 1α (PGC-1α) increasing mitochondrial biogenesis protein abundance. We investigated the extent to which lifelong 0.2% dietary quercetin enrichment attenuates dystrophic cardiopathology in mdx mice. Dystrophic animals were fed quercetin or control diet for 12 months while control C57 mice were fed a control diet...
February 13, 2017: Experimental Physiology
https://www.readbyqxmd.com/read/28191775/noninvasive-assessment-of-an-engineered-bioactive-graft-in-myocardial-infarction-impact-on-cardiac-function-and-scar-healing
#10
Carolina Gálvez-Montón, Ramon Bragós, Carolina Soler-Botija, Idoia Díaz-Güemes, Cristina Prat-Vidal, Verónica Crisóstomo, Francisco M Sánchez-Margallo, Aida Llucià-Valldeperas, Paco Bogónez-Franco, Isaac Perea-Gil, Santiago Roura, Antoni Bayes-Genis
Cardiac tissue engineering, which combines cells and biomaterials, is promising for limiting the sequelae of myocardial infarction (MI). We assessed myocardial function and scar evolution after implanting an engineered bioactive impedance graft (EBIG) in a swine MI model. The EBIG comprises a scaffold of decellularized human pericardium, green fluorescent protein-labeled porcine adipose tissue-derived progenitor cells (pATPCs), and a customized-design electrical impedance spectroscopy (EIS) monitoring system...
February 2017: Stem Cells Translational Medicine
https://www.readbyqxmd.com/read/28191731/right-ventricular-systolic-function-in-hypoplastic-left-heart-syndrome-a-comparison-of-manual-and-automated-software-to-measure-fractional-area-change
#11
Hanna K Ruotsalainen, Hannah R Bellsham-Revell, Aaron J Bell, Jaana I Pihkala, Tiina H Ojala, John M Simpson
BACKGROUND: Quantitative echocardiographic assessment of right ventricular function is important in children with hypoplastic left heart syndrome (HLHS). The aim of this study was to examine the repeatability of different echocardiographic techniques, both manual and automated, to measure fractional area change (FAC) in patients with HLHS and to correlate these measurements with magnetic resonance imaging (MRI)-derived ejection fraction (EF). METHODS: Fifty-one children with HLHS underwent transthoracic echocardiography and cardiac MRI under the same general anesthetic as part of routine inter-stage assessment...
February 13, 2017: Echocardiography
https://www.readbyqxmd.com/read/28191460/assessment-of-influences-of-stenoses-in-right-carotid-artery-on-left-carotid-artery-using-wall-stress-marker
#12
Arindam Bit, Dushali Ghagare, Albert A Rizvanov, Himadri Chattopadhyay
Purpose. Atherosclerosis is a diseased condition of blood vessel. It causes partial blockage in lumen of vessel and affects hemodynamic of localized flowing blood. Complex geometries like region of bifurcation also affects hemodynamic to a larger extent. Complexity further increases in presence of stenoses at region of bifurcation. Such morphological change in vessel largely affects parent as well as corresponding sister and daughter vessels. In this paper, complexity in hemodynamic of blood in pair of carotid arteries (left and right carotid arteries) is evaluated in presence of stenoses at basilar segment of right artery in three-dimensional domain using reconstructed tomographic images of patient...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28188213/non-invasive-stratification-of-postinfarction-rats-based-on-degree-of-cardiac-dysfunction-using-magnetic-resonance-imaging-and-echocardiography
#13
Jan Magnus Aronsen, Emil Knut Stenersen Espe, Kristine Skårdal, Almira Hasic, Lili Zhang, Ivar Sjaastad
The myocardial infarction (MI) rat model plays a crucial role in modern cardiovascular research, but the inherent heterogeneity of this model represents a challenge. We sought to identify subgroups among the post-MI rats, and establish simple non-invasive stratification protocols for such subgroups. Six weeks after induction of MI, 49 rats underwent non-invasive examinations using magnetic resonance imaging (MRI) and echocardiography. 12 sham-operated rats served as controls. Increased end-diastolic left ventricular (LV) pressure and lung weight served as indicators for congestive heart failure (CHF)...
February 10, 2017: American Journal of Physiology. Heart and Circulatory Physiology
https://www.readbyqxmd.com/read/28185231/erratum-to-image-fusion-between-18f-fdg-pet-and-mri-in-cardiac-sarcoidosis-a-case-series
#14
Shahin Zandieh, Reinhard Bernt, Siroos Mirzaei, Joerg Haller, Klaus Hergan, Christian Pirich
No abstract text is available yet for this article.
February 9, 2017: Journal of Nuclear Cardiology: Official Publication of the American Society of Nuclear Cardiology
https://www.readbyqxmd.com/read/28184976/decreased-diastolic-ventricular-kinetic-energy-in-young-patients-with-fontan-circulation-demonstrated-by-four-dimensional-cardiac-magnetic-resonance-imaging
#15
Pia Sjöberg, Einar Heiberg, Pär Wingren, Jens Ramgren Johansson, Torsten Malm, Håkan Arheden, Petru Liuba, Marcus Carlsson
Four-dimensional (4D) flow magnetic resonance imaging (MRI) enables quantification of kinetic energy (KE) in intraventricular blood flow. This provides a novel way to understand the cardiovascular physiology of the Fontan circulation. In this study, we aimed to quantify the KE in functional single ventricles. 4D flow MRI was acquired in eleven patients with Fontan circulation (median age 12 years, range 3-29) and eight healthy volunteers (median age 26 years, range 23-36). Follow-up MRI after surgical or percutaneous intervention was performed in 3 patients...
February 10, 2017: Pediatric Cardiology
https://www.readbyqxmd.com/read/28183504/a-6-month-old-infant-with-different-capnography-values-in-polysomnography
#16
Lourdes M DelRosso, Pacifico Palacay, Ngoc P Ly
A 6-month-old infant with a past medical history of hypoxic ischemic encephalopathy was referred for evaluation of snoring. She was born at 41 weeks' gestational age to a 25-year-old gravida 1, para 1 mother via vacuum-assisted delivery due to cardiac decelerations. The infant's Apgar scores were 1, 4, and 6 with nuchal cord and meconium at delivery. She was started on positive-pressure ventilation but eventually required intubation at approximately 40 minutes of life. Brain MRI showed abnormal areas of restricted diffusion, involving the corpus callosum, bilateral posterior limb of the internal capsules, and possible scattered areas of frontal and occipital lobe cortices...
February 2017: Chest
https://www.readbyqxmd.com/read/28181359/general-anesthesia-with-a-native-airway-for-patients-with-mucopolysaccharidosis-type-iii
#17
Mineto Kamata, Christopher McKee, Kristen V Truxal, Kevin M Flanigan, Kim L McBride, Shawn C Aylward, Joseph D Tobias, Marco Corridore
BACKGROUND: Mucopolysaccharidosis type III is a progressive disease with worsening airway, pulmonary, and cardiac involvement that may complicate anesthetic care. AIM: To prospectively evaluate the incidence of airway issues and complications during magnetic resonance imaging (MRI) and lumbar puncture (LP) during general anesthesia with a native airway for patients with mucopolysaccharidosis type III. METHOD: The study was a part of the natural history study...
February 8, 2017: Paediatric Anaesthesia
https://www.readbyqxmd.com/read/28178960/ultrasound-and-dynamic-functional-imaging-in-vascular-cognitive-impairment-and-alzheimer-s-disease
#18
REVIEW
Branko Malojcic, Panteleimon Giannakopoulos, Farzaneh A Sorond, Elsa Azevedo, Marina Diomedi, Janja Pretnar Oblak, Nicola Carraro, Marina Boban, Laszlo Olah, Stephan J Schreiber, Aleksandra Pavlovic, Zsolt Garami, Nantan M Bornstein, Bernhard Rosengarten
BACKGROUND: The vascular contributions to neurodegeneration and neuroinflammation may be assessed by magnetic resonance imaging (MRI) and ultrasonography (US). This review summarises the methodology for these widely available, safe and relatively low cost tools and analyses recent work highlighting their potential utility as biomarkers for differentiating subtypes of cognitive impairment and dementia, tracking disease progression and evaluating response to treatment in various neurocognitive disorders...
February 9, 2017: BMC Medicine
https://www.readbyqxmd.com/read/28176182/rb-82-pet-ct-left-ventricular-mass-to-volume-ratios
#19
Andrew Van Tosh, Nathaniel Reichek, C David Cooke, Christopher J Palestro, Kenneth J Nichols
Left ventricular (LV) mass:volume ratios indexed to body size (Mi/Vi) provide risk stratification for cardiac events. We sought to determine whether Rb-82 PET mass and volume indices are similar to MRI normal values for low likelihood subjects, and whether abnormal indices are related to abnormal myocardial blood flow (MBF). Data were analyzed retrospectively for 194 patients referred for rest/stress Rb-82 PET. LV EF, volume and mass values were calculated and mass:volume ratios were indexed to patients' height and weight...
February 7, 2017: International Journal of Cardiovascular Imaging
https://www.readbyqxmd.com/read/28169434/magnetic-resonance-imaging-in-non-dependent-pacemaker-patients-with-pacemakers-and-defibrillators-with-a-nearly-depleted-battery
#20
Hideo Okamura, Deepak Padmanabhan, Robert E Watson, Connie Dalzell, Nancy Acker, Mary Jondal, Abby L Romme, Yong-Mei Cha, Samuel J Asirvatham, Joel P Felmlee, Paul A Friedman
BACKGROUND: Magnetic resonance imaging (MRI) in patients with non-MRI-conditional cardiac implantable electronic devices (CIEDs) has been shown to be safe when performed under closely monitored protocols. However, the safety of MRI in patients with devices with a nearly depleted battery has not been reported. METHODS: Prospective data was collected between January 2008 and May 2015 in patients with non-MRI-conditional CIEDs undergoing clinically indicated MRI under institutional protocol...
February 7, 2017: Pacing and Clinical Electrophysiology: PACE
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