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https://www.readbyqxmd.com/read/29674971/a-numerical-study-of-scalable-cardiac-electro-mechanical-solvers-on-hpc-architectures
#1
Piero Colli Franzone, Luca F Pavarino, Simone Scacchi
We introduce and study some scalable domain decomposition preconditioners for cardiac electro-mechanical 3D simulations on parallel HPC (High Performance Computing) architectures. The electro-mechanical model of the cardiac tissue is composed of four coupled sub-models: (1) the static finite elasticity equations for the transversely isotropic deformation of the cardiac tissue; (2) the active tension model describing the dynamics of the intracellular calcium, cross-bridge binding and myofilament tension; (3) the anisotropic Bidomain model describing the evolution of the intra- and extra-cellular potentials in the deforming cardiac tissue; and (4) the ionic membrane model describing the dynamics of ionic currents, gating variables, ionic concentrations and stretch-activated channels...
2018: Frontiers in Physiology
https://www.readbyqxmd.com/read/29674965/development-of-matrix-metalloproteinase-2-inhibitors-for-cardioprotection
#2
Péter Bencsik, Krisztina Kupai, Anikó Görbe, Éva Kenyeres, Zoltán V Varga, János Pálóczi, Renáta Gáspár, László Kovács, Lutz Weber, Ferenc Takács, István Hajdú, Gabriella Fabó, Sándor Cseh, László Barna, Tamás Csont, Csaba Csonka, György Dormán, Péter Ferdinandy
The objective of our present study is to develop novel inhibitors for MMP-2 for acute cardioprotection. In a series of pilot studies, novel substituted carboxylic acid derivatives were synthesized based on imidazole and thiazole scaffolds and then tested in a screeening cascade for MMP inhibition. We found that the MMP-inhibiting effects of imidazole and thiazole carboxylic acid-based compounds are superior in efficacy in comparison to the conventional hydroxamic acid derivatives of the same molecules. Based on these results, a 568-membered focused library of imidazole and thiazole compounds was generated in silico and then the library members were docked to the 3D model of MMP-2 followed by an in vitro medium throughput screening (MTS) based on a fluorescent assay employing MMP-2 catalytic domain...
2018: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/29670888/computational-fluid-dynamic-analysis-of-the-left-atrial-appendage-to-predict-thrombosis-risk
#3
Giorgia Maria Bosi, Andrew Cook, Rajan Rai, Leon J Menezes, Silvia Schievano, Ryo Torii, Gaetano Burriesci
During Atrial Fibrillation (AF) more than 90% of the left atrial thrombi responsible for thromboembolic events originate in the left atrial appendage (LAA), a complex small sac protruding from the left atrium (LA). Current available treatments to prevent thromboembolic events are oral anticoagulation, surgical LAA exclusion, or percutaneous LAA occlusion. However, the mechanism behind thrombus formation in the LAA is poorly understood. The aim of this work is to analyse the hemodynamic behaviour in four typical LAA morphologies - "Chicken wing", "Cactus", "Windsock" and "Cauliflower" - to identify potential relationships between the different shapes and the risk of thrombotic events...
2018: Frontiers in Cardiovascular Medicine
https://www.readbyqxmd.com/read/29670871/echocardiographic-evaluation-of-ventricular-function-for-the-neonatologist-and-pediatric-intensivist
#4
REVIEW
Cécile Tissot, Yogen Singh, Nicole Sekarski
In the neonatal and pediatric intensive care setting, bedside cardiac ultrasound is often used to assess ventricular dimensions and function. Depending upon the underlying disease process, it is necessary to be able to evaluate the systolic and diastolic function of left and or right ventricles. The systolic function of left ventricle is mostly assessed qualitatively on visual inspection "eye-balling" and quantitatively by measuring circumferential fraction shortening or calculating the ejection fraction by Simpson's planimetry...
2018: Frontiers in Pediatrics
https://www.readbyqxmd.com/read/29670532/confocal-microscopy-based-estimation-of-parameters-for-computational-modeling-of-electrical-conduction-in-the-normal-and-infarcted-heart
#5
Joachim Greiner, Aparna C Sankarankutty, Gunnar Seemann, Thomas Seidel, Frank B Sachse
Computational modeling is an important tool to advance our knowledge on cardiac diseases and their underlying mechanisms. Computational models of conduction in cardiac tissues require identification of parameters. Our knowledge on these parameters is limited, especially for diseased tissues. Here, we assessed and quantified parameters for computational modeling of conduction in cardiac tissues. We used a rabbit model of myocardial infarction (MI) and an imaging-based approach to derive the parameters. Left ventricular tissue samples were obtained from fixed control hearts (animals: 5) and infarcted hearts (animals: 6) within 200 μm (region 1), 250-750 μm (region 2) and 1,000-1,250 μm (region 3) of the MI border...
2018: Frontiers in Physiology
https://www.readbyqxmd.com/read/29667640/-the-efficiency-of-the-application-of-the-modern-computed-technologies-in-the-clinical-practice-and-the-prospects-for-the-further-use-of-the-biomechanical-3d-models-in-forensic-medicine
#6
I Yu Makarov, A V Svetlakov, A V Sotin, S V Shigeev, A A Gusarov, S A Smirenin, V V Emelin, V B Stragis, V A Fetisov
To-day, the computer-assisted 3D-technologies for the mathematical simulation of the engineering facilities are extensively used for the purpose of technical calculations in all branches of industry and building. The positive experience gained with the application of the 3D-models finds wide application in the joined investigations on the topical problems of the prosthetic and surgical treatment of bones, teeth, joints, cardiac valves, blood vessels, etc. The objective of the present study was the analysis of the positive experience with the involvement of the specialists in the design and practical application of 3D-models for the solution of problems facing the medical prosthetics and the management of various pathological conditions...
2018: Sudebno-meditsinskaia Ekspertiza
https://www.readbyqxmd.com/read/29667046/radiotherapy-in-patients-with-cardiac-implantable-electronic-devices-clinical-and-dosimetric-aspects
#7
Giulia Riva, Ombretta Alessandro, Ruggero Spoto, Annamaria Ferrari, Cristina Garibaldi, Federica Cattani, Rosa Luraschi, Elena Rondi, Nicola Colombo, Fulvio Lorenzo Francesco Giovenzana, Carlo Maria Cipolla, Mikolaj Winnicki, Martina Persiani, Fabiana Castelluccia, Massimo Sarra Fiore, Roberto Orecchia, Barbara Alicja Jereczek-Fossa
As a result of aging, the number of patients with cardiac implantable electronic device (CIED) requiring radiotherapy (RT) continues to rise. The aim of this work was to evaluate RT-related malfunctions of CIED in a cohort of patients who underwent RT in our clinic from June 2010 to December 2016. We retrospectively analyzed 93 RT treatments in 63 patients with CIEDs. Patients were treated with 3D conformal RT, intensity-modulated RT and stereotactic RT. We collected clinical characteristics of cancer, models of CIEDs, total RT dose to tumor and radiation energy...
April 17, 2018: Medical Oncology
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/29665002/three-dimensional-collagenous-niche-and-azacytidine-selectively-promote-time-dependent-cardiomyogenesis-from-human-bone-marrow-derived-msc-spheroids
#9
Jyotsna Joshi, Gautam Mahajan, Chandrasekhar R Kothapalli
Endogenous adult cardiac regenerative machinery is not capable of replacing the lost cells following myocardial infarction, often leading to permanent alterations in structure-function-mechanical properties. Regenerative therapies based on delivering autologous stem cells within an appropriate 3D milieu could meet such demand, by enabling homing and directed differentiation of the transplanted cells into lost specialized cell populations. Since type I collagen is the predominant cardiac tissue matrix protein, we here optimized the 3D niche which could promote time-dependent evolution of cardiomyogenesis from human bone marrow-derived mesenchymal stem cells (BM-MSC)...
April 17, 2018: Biotechnology and Bioengineering
https://www.readbyqxmd.com/read/29660548/how-to-deal-with-the-empty-space-after-organ-removal-for-transplantation-a-single-medical-center-experience
#10
Ding-Ping Sun, Ling-Hsien Lee, Yu-Feng Tian, Hong-Xiang Zheng, Jinn-Rung Kuo, Che-Chuan Wang
PURPOSE: Dealing with the empty space after organ removal for transplantation has not been investigated. MATERIALS AND METHODS: From January 28, 2005, to November 21, 2017, 111 organ donors were enrolled in this study. They were divided into three groups: no replacement, replaced with paper printed with organ graphics, or replaced with 3D-printed simulated organs after the organs were removed at different periods. The donor's age, gender, etiology of admission, characteristic and clinical pictures, time interval between admission and the date of donation, and time interval between donor coordinator consultations were evaluated...
April 13, 2018: World Neurosurgery
https://www.readbyqxmd.com/read/29655572/3d-modelling-and-printing-technology-to-produce-patient-specific-3d-models
#11
Nicolette S Birbara, James M Otton, Nalini Pather
BACKGROUND: A comprehensive knowledge of mitral valve (MV) anatomy is crucial in the assessment of MV disease. While the use of three-dimensional (3D) modelling and printing in MV assessment has undergone early clinical evaluation, the precision and usefulness of this technology requires further investigation. This study aimed to assess and validate 3D modelling and printing technology to produce patient-specific 3D MV models. METHODS: A prototype method for MV 3D modelling and printing was developed from computed tomography (CT) scans of a plastinated human heart...
November 10, 2017: Heart, Lung & Circulation
https://www.readbyqxmd.com/read/29653353/a-statistical-shape-model-of-the-left-ventricle-from-real-time-3d-echocardiography-and-its-application-to-myocardial-segmentation-of-cardiac-magnetic-resonance-images
#12
M C Carminati, C Piazzese, M Pepi, G Tamborini, P Gripari, G Pontone, R Krause, A Auricchio, R M Lang, E G Caiani
OBJECT: We present in this paper the application of a statistical shape model of the left ventricle (LV) built from transthoracic real time 3D echocardiography (3DE) to segment the LV endocardium and epicardium in cardiac magnetic resonance (CMR) images. MATERIAL AND METHODS: The LV model was built from a training database constituted by over 9000 surfaces obtained from retrospectively selected 3DE examination of 435 patients with various pathologies. Three-dimensional segmentation of the endocardium and the epicardium was obtained by processing CMR images acquired in 30 patients with a dedicated active shape modelling (ASM) algorithm using the proposed LV model...
March 30, 2018: Computers in Biology and Medicine
https://www.readbyqxmd.com/read/29652390/integrated-catheter-for-simultaneous-radio-frequency-ablation-and-optoacoustic-monitoring-of-lesion-progression
#13
Johannes Rebling, Francisco Javier Oyaga Landa, Xosé Luís Deán-Ben, Alexandre Douplik, Daniel Razansky
Radio frequency (RF) catheter ablation is commonly used to eliminate dysfunctional cardiac tissue by heating via an alternating current. Clinical outcomes are highly dependent on careful anatomical guidance, electrophysiological mapping, and careful RF power titration during the procedure. Yet, current treatments rely mainly on the expertise of the surgeon to assess lesion formation, causing large variabilities in the success rate. We present an integrated catheter design suitable for simultaneous RF ablation and real-time optoacoustic monitoring of the forming lesion...
April 15, 2018: Optics Letters
https://www.readbyqxmd.com/read/29650434/importance-of-three-dimensional-speckle-tracking-in-the-assessment-of-left-atrial-and-ventricular-dysfunction-in-patients-with-myotonic-dystrophy-type-1
#14
Henrique Guedes, Nuno Moreno, Rui Pontes Dos Santos, Leonor Marques, Daniel Seabra, Adriana Pereira, Aurora Andrade, Paula Pinto
INTRODUCTION AND AIM: Myotonic dystrophy type 1 (DM1) is a multisystem disease in which cardiac involvement is common. The aim of this study was to identify early changes in left atrial (LA) mechanics and left ventricular (LV) systolic function in patients with myotonic dystrophy type 1 using three-dimensional (3D) speckle tracking echocardiography (3D-STE). METHODS: This observational study included 25 patients with DM1 and 25 healthy volunteers. We assessed LA and LV global strain parameters using 3D-STE...
April 9, 2018: Portuguese Journal of Cardiology: An Official Journal of the Portuguese Society of Cardiology
https://www.readbyqxmd.com/read/29643812/left-ventricular-wall-stress-is-sensitive-marker-of-hypertrophic-cardiomyopathy-with-preserved-ejection-fraction
#15
Xiaodan Zhao, Ru-San Tan, Hak-Chiaw Tang, Soo-Kng Teo, Yi Su, Min Wan, Shuang Leng, Jun-Mei Zhang, John Allen, Ghassan S Kassab, Liang Zhong
Hypertrophic cardiomyopathy (HCM) patients present altered myocardial mechanics due to the hypertrophied ventricular wall and are typically diagnosed by the increase in myocardium wall thickness. This study aimed to quantify regional left ventricular (LV) shape, wall stress and deformation from cardiac magnetic resonance (MR) images in HCM patients and controls, in order to establish superior measures to differentiate HCM from controls. A total of 19 HCM patients and 19 controls underwent cardiac MR scans. The acquired MR images were used to reconstruct 3D LV geometrical models and compute the regional parameters (i...
2018: Frontiers in Physiology
https://www.readbyqxmd.com/read/29628446/assessment-of-lvef-using-a-new-16-segment-wall-motion-score-in-echocardiography
#16
Real Lebeau, Karim Serri, Maria Di Lorenzo, Claude Sauvé, Van Hoai Viet Le, Vicky Soulières, Malak El-Rayes, Maude Pagé, Chimène Zaïani, Jérôme Garot, Frédéric Poulin
BACKGROUND: Simpson biplane method and 3D by transthoracic echocardiography (TTE), radionuclide angiography (RNA) and cardiac magnetic resonance imaging (CMR) are the most accepted techniques for left ventricular ejection fraction (LVEF) assessment. Wall motion score index (WMSI) by TTE is an accepted complement. However, the conversion from WMSI to LVEF is obtained through a regression equation, which may limit its use. In this retrospective study, we aimed to validate a new method to derive LVEF from the wall motion score in 95 patients...
June 2018: Echo Research and Practice
https://www.readbyqxmd.com/read/29627677/preparation-of-high-bioactivity-multilayered-bone-marrow-mesenchymal-stem-cell-sheet-for-myocardial-infarction-using-a-3d-dynamic-system
#17
Yingwei Wang, Jianhua Zhang, Zixi Qin, Zepei Fan, Cheng Lu, Baoxin Chen, Jupeng Zhao, Xiaojuan Li, Fei Xiao, Xi Lin, Zheng Wu
Cell sheet techniques offer a promising future for myocardial infarction (MI) therapy; however, insufficient nutrition supply remains the major limitation in maintaining stem cell bioactivities in vitro. In order to enhance cell sheet mechanical strength and bioactivities, a decellularized porcine pericardium (DPP) scaffold was prepared by the phospholipase A2 method, and aspartic acid was used as a spacer arm to improve the vascular endothelial growth factor crosslink efficiency on the DPP scaffold. Based on this scaffold, multilayered bone marrow mesenchymal stem cell sheets were rapidly constructed, using RAD16-I peptide hydrogel as a temporary 3D scaffold, and cell sheets were cultured in either the 3D-dynamic system (DCcs) or the traditional static condition (SCcs)...
April 5, 2018: Acta Biomaterialia
https://www.readbyqxmd.com/read/29626239/high-spatial-resolution-free-breathing-3d-late-gadolinium-enhancement-cardiac-magnetic-resonance-imaging-in-ischaemic-and-non-ischaemic-cardiomyopathy-quantitative-assessment-of-scar-mass-and-image-quality
#18
Maurice B Bizino, Qian Tao, Jacob Amersfoort, Hans-Marc J Siebelink, Pieter J van den Bogaard, Rob J van der Geest, Hildo J Lamb
PURPOSE: To compare breath-hold (BH) with navigated free-breathing (FB) 3D late gadolinium enhancement cardiac MRI (LGE-CMR) MATERIALS AND METHODS: Fifty-one patients were retrospectively included (34 ischaemic cardiomyopathy, 14 non-ischaemic cardiomyopathy, three discarded). BH and FB 3D phase sensitive inversion recovery sequences were performed at 3T. FB datasets were reformatted into normal resolution (FB-NR, 1.46x1.46x10mm) and high resolution (FB-HR, isotropic 0.91-mm voxels). Scar mass, scar edge sharpness (SES), SNR and CNR were compared using paired-samples t-test, Pearson correlation and Bland-Altman analysis...
April 6, 2018: European Radiology
https://www.readbyqxmd.com/read/29622988/outflow-tract-ventricular-premature-beats-ablation-in-the-presence-or-absence-of-structural-heart-disease-technical-considerations-and-clinical-outcomes
#19
Haitham Badran, Rania Samir, Mohamed Amin
Background: Premature ventricular beats (PVBs) are early depolarization of the myocardium originating in the ventricle. In case of very frequent PVBs, patients are severely symptomatic with impaired quality of life and are at risk of pre-syncope, syncope, heart failure, and sudden cardiac death particularly in the presence of structural heart disease. Ventricular outflow tracts are the most common sites of origin of idiopathic PVBs especially in patients without structural heart disease...
December 2017: The Egyptian heart journal: (EHJ): official bulletin of the Egyptian Society of Cardiology
https://www.readbyqxmd.com/read/29618036/quantification-of-aortic-stiffness-and-wall-stress-in-healthy-volunteers-and-abdominal-aortic-aneurysm-patients-using-time-resolved-3d-ultrasound-a-comparison-study
#20
Emiel M J van Disseldorp, Niels J Petterson, Frans N van de Vosse, Marc R H M van Sambeek, Richard G P Lopata
Aims: Using non-invasive 3D ultrasound, peak wall stress (PWS) and aortic stiffness can be evaluated, which may provide additional criteria in abdominal aortic aneurysm (AAA) risk assessment. In this study, these measures were determined in both young and age-matched individuals, and AAA patients while its relation to age, maximum diameter, and growth was assessed statistically. Methods and results: Time-resolved 3D-US data were acquired for 30 volunteers and 65 AAA patients...
March 29, 2018: European Heart Journal Cardiovascular Imaging
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