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https://www.readbyqxmd.com/read/28440670/cardiac-magnetic-resonance-based-evaluation-of-aortic-stiffness-and-epicardial-fat-volume-in-patients-with-hypertension-diabetes-mellitus-and-myocardial-infarction
#1
Rami Homsi, Alois M Sprinkart, Juergen Gieseke, Michael Meier-Schroers, Seyrani Yuecel, Stefan Fischer, Jennifer Nadal, Darius Dabir, Julian A Luetkens, Daniel L Kuetting, Hans H Schild, Daniel K Thomas
Background Aortic stiffness and epicardial fat relate to cardiovascular risk. Their relationship with each other and their role with hypertension, diabetes mellitus (DM), and myocardial infarction (MI) can be evaluated by cardiac magnetic resonance (CMR). Purpose To explore an association between aortic stiffness and epicardial as well as paracardial fat volume (EFV and ParaFV, respectively) in hypertensive patients and to relate the results to the presence of DM and MI. Material and Methods A total of 156 hypertensive and 20 non-hypertensive participants were examined at 1...
January 1, 2017: Acta Radiologica
https://www.readbyqxmd.com/read/28436918/an-integrated-and-highly-sensitive-ultrafast-acoustoelectric-imaging-system-for-biomedical-applications
#2
Beatrice Berthon, Pierre-Marc Dansette, Mickael Tanter, Mathieu Pernot, Jean Provost
PURPOSE: Direct imaging of cardiac electrical activation is crucial to better understand and diagnose diseases linked to arrhythmias. This work presents an Ultrafast Acoustoelectric Imaging (UAI) system for direct and non-invasive ultrafast mapping of propagating current densities. MATERIALS AND METHODS: Acoustoelectric imaging is based on the acoustoelectric effect, the modulation of the medium's electrical impedance by a propagating ultrasonic wave. UAI triggers this effect with plane wave emissions to image current densities...
April 24, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28434997/multi-photon-microscopy-in-cardiovascular-research
#3
REVIEW
Zhuojun Wu, Timo Rademakers, Fabian Kiessling, Michael Vogt, Erik Westein, Christian Weber, Remco Ta Megens, Marc van Zandvoort
Multiphoton laser scanning microscopy has proven profound value for ex vivo 3D histology and in vivo imaging of motionless tissue. The development of triggering systems and fast imaging methods, combined with advanced preparation procedures solved the challenging task of intravital imaging of the fast pulsating heart and major arteries in animals and further increased the popularity of intravital multiphoton imaging in cardiovascular research. This review article will highlight the potential of multiphoton microscopy for the visualization and characterization of dynamical and structural processes involved in cardiac and vascular diseases, both in an ex vivo and an intravital animal setting...
April 18, 2017: Methods: a Companion to Methods in Enzymology
https://www.readbyqxmd.com/read/28434968/cardiac-contractility-correction-strategies-applied-to-telemetry-data-from-a-hesi-sponsored-consortium
#4
Emmanuel Boulay, Michael K Pugsley, Vincent Jacquemet, Alain Vinet, Michael V Accardi, Maxim Soloviev, Eric Troncy, Jennifer M Doyle, Jennifer Beck Pierson, Simon Authier
INTRODUCTION: QT has a long history of heart rate (HR) correction but limited investigations have been undertaken to assess the impact of cardiovascular parameters on left ventricular (LV) contractility in drug safety testing. Cardiac contractility is affected by preload (Cyon-Frank-Starling law), afterload (Anrep effect) and HR (Bowditch effect). We evaluated multi-parameter correction methods to help with dP/dtmax interpretation. METHODOLOGY: Modeling was undertaken using data from dogs in single or double 4×4 Latin square studies...
April 20, 2017: Journal of Pharmacological and Toxicological Methods
https://www.readbyqxmd.com/read/28433661/differential-protein-acetylation-assists-import-of-excess-sod2-into-mitochondria-and-mediates-sod2-aggregation-associated-with-cardiac-hypertrophy-in-the-murine-sod2-tg-heart
#5
Liwen Zhang, Chwen-Lih Chen, Patrick T Kang, Zhicheng Jin, Yeong-Renn Chen
SOD2 is the primary antioxidant enzyme neutralizing ((•))O2((-)) in mitochondria. Cardiac-specific SOD2 overexpression (SOD2-tg) induces supernormal function and cardiac hypertrophy in the mouse heart. However, the reductive stress imposed by SOD2 overexpression results in protein aggregation of SOD2 pentamers and differential hyperacetylation of SOD2 in the mitochondria and cytosol. Here, we studied SOD2 acetylation in SOD2-tg and wild-type mouse hearts. LC-MS/MS analysis indicated the presence of four acetylated lysines in matrix SOD2 and nine acetylated lysines in cytosolic SOD2 from the SOD2-tg heart...
April 19, 2017: Free Radical Biology & Medicine
https://www.readbyqxmd.com/read/28426162/motion-corrected-simultaneous-cardiac-positron-emission-tomography-and-coronary-mr-angiography-with-high-acquisition-efficiency
#6
Camila Munoz, Radhouene Neji, Gastão Cruz, Andrew Mallia, Sami Jeljeli, Andrew J Reader, Rene M Botnar, Claudia Prieto
PURPOSE: Develop a framework for efficient free-breathing simultaneous whole-heart coronary magnetic resonance angiography (CMRA) and cardiac positron emission tomography (PET) on a 3 Tesla PET-MR system. METHODS: An acquisition that enables nonrigid motion correction of both CMRA and PET has been developed. The proposed method estimates translational motion from low-resolution 2D MR image navigators acquired at each heartbeat and 3D nonrigid respiratory motion between different respiratory bins from the CMRA data itself...
April 20, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28419023/interrelations-of-epicardial-fat-volume-left-ventricular-t1-relaxation-times-and-myocardial-strain-in-hypertensive-patients-a-cardiac-magnetic-resonance-study
#7
Rami Homsi, Daniel Kuetting, Alois Sprinkart, Nina Steinfeld, Michael Meier-Schroers, Julian Luetkens, Jennifer Nadal, Darius Dabir, Stefan Fischer, Juergen Gieseke, Hans Schild, Daniel Thomas
PURPOSE: This cardiac magnetic resonance study was performed to assess myocardial fibrosis by evaluating T1-relaxation time (T1), to measure left ventricular (LV) strain, and to determine epicardial fat volume (EFV) in hypertensive patients with no history of cardiovascular (CV) events and to relate the results to the presence of coronary atherosclerotic artery disease (CAD) in these patients. MATERIALS AND METHODS: A total of 123 subjects were examined at 1.5 T...
May 2017: Journal of Thoracic Imaging
https://www.readbyqxmd.com/read/28414667/the-mysterious-case-of-dyspnea
#8
S Saad, N Turaga, J Grant, N Jain
INTRODUCTION: Dehiscence of a mitral valve annuloplasty ring is a rare occurrence that often manifests as mitral regurgitation and heart failure. We present a case of mitral ring dehiscence which was initially unrecognized by standard 2-dimensional transthoracic echocardiography (2D TTE); and 2-dimensional transesophageal echocardiography (2D TEE);. CASE: A 65-year-old woman was referred to Cardiology clinic for evaluation of dyspnea. Her history included tobacco abuse, atrial fibrillation status post pulmonary vein isolation, nonischemic cardiomyopathy, and prior mitral valve repair with annuloplasty ring for rheumatic valvular disease...
March 2017: Journal of the Louisiana State Medical Society: Official Organ of the Louisiana State Medical Society
https://www.readbyqxmd.com/read/28412431/3d-morphological-changes-in-lv-and-rv-during-lvad-ramp-studies
#9
Karima Addetia, Nir Uriel, Francesco Maffessanti, Gabriel Sayer, Sirtaz Adatya, Gene H Kim, Nitasha Sarswat, Savitri Fedson, Diego Medvedofsky, Eric Kruse, Keith Collins, Daniel Rodgers, Takayoshi Ota, Valluvan Jeevanandam, Victor Mor-Avi, Daniel Burkhoff, Roberto M Lang
OBJECTIVES: The purpose of this study was to investigate the differential impact of the 2 most commonly available left ventricular assist device (LVAD) types on the right (RV) and left (LV) ventricles using 3-dimensional (3D) echocardiography-based analysis of ventricular morphology. BACKGROUND: LVADs have emerged as common therapy for advanced heart failure. Recent data suggest that the heart responds differently to speed settings in the 2 main devices available (HeartMate II [HMII], St Jude Medical, Pleasanton, California, and HVAD, HeartWare International, Framingham, Massachusetts)...
April 7, 2017: JACC. Cardiovascular Imaging
https://www.readbyqxmd.com/read/28405789/left-ventricular-strain-and-twisting-in-heart-failure-with-preserved-ejection-fraction-an-updated-review
#10
REVIEW
Marijana Tadic, Elisabeth Pieske-Kraigher, Cesare Cuspidi, Martin Genger, Daniel A Morris, Kun Zhang, Nina Alexandra Walther, Burket Pieske
Despite the high prevalence of the patients with heart failure with preserved ejection fraction (HFpEF), our knowledge about this entity, from diagnostic tools to therapeutic approach, is still not well established. The evaluation of patients with HFpEF is mainly based on echocardiography, as the most widely accepted tool in cardiac imaging. Identification of left ventricular (LV) diastolic dysfunction has long been considered as the only responsible for HFpEF, and its evaluation is still "sine qua non" of HFpEF diagnostics...
April 12, 2017: Heart Failure Reviews
https://www.readbyqxmd.com/read/28400606/imaging-the-dynamics-of-cardiac-fiber-orientation-in-vivo-using-3d-ultrasound-backscatter-tensor-imaging
#11
Clement Papadacci, Victor Finel, Jean Provost, Olivier Villemain, Patrick Bruneval, Jean-Luc Gennisson, Mickael Tanter, Mathias Fink, Mathieu Pernot
The assessment of myocardial fiber disarray is of major interest for the study of the progression of myocardial disease. However, time-resolved imaging of the myocardial structure remains unavailable in clinical practice. In this study, we introduce 3D Backscatter Tensor Imaging (3D-BTI), an entirely novel ultrasound-based imaging technique that can map the myocardial fibers orientation and its dynamics with a temporal resolution of 10 ms during a single cardiac cycle, non-invasively and in vivo in entire volumes...
April 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28398019/epidemiology-anatomy-pathophysiology-and-clinical-evaluation-of-functional-tricuspid-regurgitation
#12
Yee-Ping Sun, Patrick T O' Gara
Tricuspid regurgitation (TR) is commonly encountered in the management of patients with a variety of cardiovascular diseases. Primary TR is the result of structural abnormalities of the valve or chordal attachments whereas functional TR results from alterations in right ventricular (RV) or right atrial (RA) size, shape or function. The vast majority of TR cases seen in practice are functional in nature and usually results from left-sided heart disease (e.g., mitral valve disease, left ventricular (LV) systolic dysfunction) and/or pulmonary vascular disease, though it also manifests in the presence of isolated chronic atrial fibrillation (AF)...
April 10, 2017: Minerva Cardioangiologica
https://www.readbyqxmd.com/read/28394816/brain-mri-findings-in-pediatric-patients-post-ecmo
#13
Venessa L Pinto, Sumit Pruthi, Ashly C Westrick, Chevis N Shannon, Brian C Bridges, Truc M Le
Neurologic complications can occur with ECMO due to several factors. Prior studies identified neonates as having unique risk factors and neuro-imaging findings post-ECMO. The aim of this study is to describe brain MRI findings of pediatric patients treated with ECMO. We conducted a retrospective study of non-neonatal pediatric patients who underwent a comprehensive brain MRI after ECMO, between January 2000 and July 2015. We identified 47 pediatric patients in the study cohort with a median age of 8 months (IQR 3-170mo) and a median ECMO run duration of 7...
April 6, 2017: ASAIO Journal: a Peer-reviewed Journal of the American Society for Artificial Internal Organs
https://www.readbyqxmd.com/read/28393762/engineering-a-functional-three-dimensional-human-cardiac-tissue-model-for-drug-toxicity-screening
#14
Hong Fang Lu, Meng Leong, Tze Lim, Ying Ping Chua, Jia Kai Lim, Chan Du, Andrew C A Wan
Cardiotoxicity is one of the major reasons for clinical drug attrition. In vitro tissue models that can provide efficient and accurate drug toxicity screening are highly desired for preclinical drug development and personalized therapy. Here, we report the fabrication and characterization of a human cardiac tissue model for high throughput drug toxicity studies. Cardiac tissues were fabricated via cellular self-assembly of human transgene-free iPSC-derived cardiomyocytes in pre-fabricated polydimethylsiloxane molds...
April 10, 2017: Biofabrication
https://www.readbyqxmd.com/read/28384492/contractile-force-generation-by-3d-hipsc-derived-cardiac-tissues-is-enhanced-by-rapid-establishment-of-cellular-interconnection-in-matrix-with-muscle-mimicking-stiffness
#15
Soah Lee, Vahid Serpooshan, Xinming Tong, Sneha Venkatraman, Meelim Lee, Jaecheol Lee, Orlando Chirikian, Joseph C Wu, Sean M Wu, Fan Yang
Engineering 3D human cardiac tissues is of great importance for therapeutic and pharmaceutical applications. As cardiac tissue substitutes, extracellular matrix-derived hydrogels have been widely explored. However, they exhibit premature degradation and their stiffness is often orders of magnitude lower than that of native cardiac tissue. There are no reports on establishing interconnected cardiomyocytes in 3D hydrogels at physiologically-relevant cell density and matrix stiffness. Here we bioengineer human cardiac microtissues by encapsulating human induced pluripotent stem cell-derived cardiomyocytes (hiPSC-CMs) in chemically-crosslinked gelatin hydrogels (1...
July 2017: Biomaterials
https://www.readbyqxmd.com/read/28382658/regional-assessment-of-in-vivo-myocardial-stiffness-using-3d-magnetic-resonance-elastography-in-a-porcine-model-of-myocardial-infarction
#16
Shivaram P Arunachalam, Arvin Arani, Francis Baffour, Joseph A Rysavy, Phillip J Rossman, Kevin J Glaser, David S Lake, Joshua D Trzasko, Armando Manduca, Kiaran P McGee, Richard L Ehman, Philip A Araoz
PURPOSE: The stiffness of a myocardial infarct affects the left ventricular pump function and remodeling. Magnetic resonance elastography (MRE) is a noninvasive imaging technique for measuring soft-tissue stiffness in vivo. The purpose of this study was to investigate the feasibility of assessing in vivo regional myocardial stiffness with high-frequency 3D cardiac MRE in a porcine model of myocardial infarction, and compare the results with ex vivo uniaxial tensile testing. METHODS: Myocardial infarct was induced in a porcine model by embolizing the left circumflex artery...
April 5, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28380247/a-new-ct-reconstruction-technique-using-adaptive-deformation-recovery-and-intensity-correction-adric
#17
You Zhang, Jianhua Ma, Puneeth Iyenga, Yuncheng Zhong, Jing Wang
PURPOSE: Sequential same-patient CT images may involve deformation-induced and non-deformation-induced voxel intensity changes. An adaptive deformation recovery and intensity correction (ADRIC) technique was developed to improve the CT reconstruction accuracy, and to separate deformation from non-deformation-induced voxel intensity changes between sequential CT images. MATERIALS AND METHODS: ADRIC views the new CT volume as a deformation of a prior high-quality CT volume, but with additional non-deformation-induced voxel intensity changes...
April 5, 2017: Medical Physics
https://www.readbyqxmd.com/read/28379383/2d-and-3d-strain-for-detection-of-subclinical-anthracycline-cardiotoxicity-in-breast-cancer-patients-a-balance-with-feasibility
#18
Ciro Santoro, Grazia Arpino, Roberta Esposito, Maria Lembo, Immacolata Paciolla, Cinzia Cardalesi, Giovanni de Simone, Bruno Trimarco, Sabino De Placido, Maurizio Galderisi
Aims: 2D echocardiography is limited for identifying chemotherapy-related cardiotoxicity. This study compared standard echo, 2D, and 3D speckle tracking echocardiography (STE) for detection of subclinical anthracycline (ANT) cardiotoxicity in breast cancer patients. Methods and results: One-hundred consecutive breast cancer patients free of cardiac symptoms were treated by multiple protocols including ANT and cyclophosphamide and/or 5-fluorouracil for 3-4 cycles...
March 31, 2017: European Heart Journal Cardiovascular Imaging
https://www.readbyqxmd.com/read/28379376/the-gerbode-defect-diagnosed-by-3d-reconstructed-cardiac-computed-tomography
#19
Masazumi Watanabe, Takahiro Taguchi, Keijiro Katayama, Katsuhiko Imai, Sueda Taijiro
No abstract text is available yet for this article.
March 30, 2017: European Heart Journal Cardiovascular Imaging
https://www.readbyqxmd.com/read/28376365/bioacoustic-enabled-patterning-of-human-ipsc-derived-cardiomyocytes-into-3d-cardiac-tissue
#20
Vahid Serpooshan, Pu Chen, Haodi Wu, Soah Lee, Arun Sharma, Daniel A Hu, Sneha Venkatraman, Adarsh Venkataraman Ganesan, Osman Berk Usta, Martin Yarmush, Fan Yang, Joseph C Wu, Utkan Demirci, Sean M Wu
The creation of physiologically-relevant human cardiac tissue with defined cell structure and function is essential for a wide variety of therapeutic, diagnostic, and drug screening applications. Here we report a new scalable method using Faraday waves to enable rapid aggregation of human induced pluripotent stem cell-derived cardiomyocytes (hiPSC-CMs) into predefined 3D constructs. At packing densities that approximate native myocardium (10(8)-10(9) cells/ml), these hiPSC-CM-derived 3D tissues demonstrate significantly improved cell viability, metabolic activity, and intercellular connection when compared to constructs with random cell distribution...
July 2017: Biomaterials
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