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https://www.readbyqxmd.com/read/29760665/left-ventricular-trabeculations-decrease-the-wall-shear-stress-and-increase-the-intra-ventricular-pressure-drop-in-cfd-simulations
#1
Federica Sacco, Bruno Paun, Oriol Lehmkuhl, Tinen L Iles, Paul A Iaizzo, Guillaume Houzeaux, Mariano Vázquez, Constantine Butakoff, Jazmin Aguado-Sierra
The aim of the present study is to characterize the hemodynamics of left ventricular (LV) geometries to examine the impact of trabeculae and papillary muscles (PMs) on blood flow using high performance computing (HPC). Five pairs of detailed and smoothed LV endocardium models were reconstructed from high-resolution magnetic resonance images (MRI) of ex-vivo human hearts. The detailed model of one LV pair is characterized only by the PMs and few big trabeculae, to represent state of art level of endocardial detail...
2018: Frontiers in Physiology
https://www.readbyqxmd.com/read/29759615/enhancing-response-in-the-cardiac-resynchronization-therapy-patient-the-3b-perspective-bench-bits-and-bedside
#2
REVIEW
Angelo Auricchio, Frits W Prinzen
Cardiac resynchronization therapy (CRT) is an established nonpharmacological treatment for patients with heart failure (HF), reduced left ventricular (LV) ejection fraction, and a wide QRS complex. Although the therapy was developed 30 years ago and approved by the Food and Drug Administration in 2001, attempts to improve it have never stopped. Such improvements have been facilitated by combining knowledge from bench (basic science), bits (computer modeling), and bedside (clinical studies); these issues are addressed in the present review...
November 2017: JACC. Clinical Electrophysiology
https://www.readbyqxmd.com/read/29759492/radiofrequency-ablation-using-an-open-irrigated-electrode-cooled-with-half-normal-saline
#3
Duy T Nguyen, Edward P Gerstenfeld, Wendy S Tzou, Paul T Jurgens, Lijun Zheng, Joseph Schuller, Matthew Zipse, William H Sauer
OBJECTIVES: This study evaluated the use of half-normal saline (HNS) as the radiofrequency ablation (RFA) cooling irrigant. BACKGROUND: Some instances of ventricular arrhythmia may originate deep within myocardium and can be refractory to standard ablation using open irrigated RFA. Recent data suggest that deeper ablation lesions can be created by decreasing the irrigant ionic concentration delivered through open irrigated RFA than by using normal saline (NS). METHODS: Bovine myocardium was placed in a circulating saline bath...
October 2017: JACC. Clinical Electrophysiology
https://www.readbyqxmd.com/read/29743900/complications-of-electrotherapy-the-dark-side-of-treatment-with-cardiac-implantable-electronic-devices
#4
REVIEW
Szymon Domagała, Michał Domagała, Jakub Chyła, Celina Wojciechowska, Marianna Janion, Anna Polewczyk
In the past years we have been observing the dynamic development of electrotherapy, as evidenced by the steadily rising number of implanted pacemakers (PM), as well as devices used in the treatment of dangerous arrhythmia and heart failure, such as implantable cardioverter defibrillators (ICD) and cardiac resynchronisation therapy (CRT-P/D). This is a consequence of the ageing of the populations of the majority of developed countries and also the gradually widening indications for the use of such devices. Along with the observed rise in the number of new implantations, the number of complications of electrotherapy is rising as well...
2018: Postępy W Kardiologii Interwencyjnej, Advances in Interventional Cardiology
https://www.readbyqxmd.com/read/29743679/control-of-cardiac-jelly-dynamics-by-notch1-and-nrg1-defines-the-building-plan-for-trabeculation
#5
Gonzalo Del Monte-Nieto, Mirana Ramialison, Arne A S Adam, Bingruo Wu, Alla Aharonov, Gabriele D'Uva, Lauren M Bourke, Mara E Pitulescu, Hanying Chen, José Luis de la Pompa, Weinian Shou, Ralf H Adams, Sarah K Harten, Eldad Tzahor, Bin Zhou, Richard P Harvey
In vertebrate hearts, the ventricular trabecular myocardium develops as a sponge-like network of cardiomyocytes that is critical for contraction and conduction, ventricular septation, papillary muscle formation and wall thickening through the process of compaction 1 . Defective trabeculation leads to embryonic lethality2-4 or non-compaction cardiomyopathy (NCC) 5 . There are divergent views on when and how trabeculation is initiated in different species. In zebrafish, trabecular cardiomyocytes extrude from compact myocardium 6 , whereas in chicks, chamber wall thickening occurs before overt trabeculation 7 ...
May 9, 2018: Nature
https://www.readbyqxmd.com/read/29743413/quantitative-differentiation-of-lv-myocardium-with-and-without-layer-specific-fibrosis-using-mri-in-hypertrophic-cardiomyopathy-and-layer-specific-strain-tte-analysis
#6
Nobusada Funabashi, Hiroyuki Takaoka, Koya Ozawa, Tomoko Kamata, Masae Uehara, Issei Komuro, Yoshio Kobayashi
To achieve further risk stratification in hypertrophic cardiomyopathy (HCM) patients, we localized and quantified layer-specific LVM fibrosis on MRI in HCM patients using regional layer-specific peak longitudinal strain (PLS) and peak circumferential strain (PCS) in LV myocardium (LVM) on speckle tracking transthoracic echocardiography (TTE). A total of 18 HCM patients (14 males; 58 ± 17 years) underwent 1.5T-MRI and TTE. PLS and PCS in each layer of the LVM (endocardium, epicardium, and whole-layer myocardium) were calculated for 17 AHA-defined lesions...
May 9, 2018: International Heart Journal
https://www.readbyqxmd.com/read/29739992/conduction-in-the-heart-wall-helicoidal-fibers-minimize-diffusion-bias
#7
Tristan Aumentado-Armstrong, Amir Kadivar, Peter Savadjiev, Steven W Zucker, Kaleem Siddiqi
The mammalian heart must function as an efficient pump while simultaneously conducting electrical signals to drive the contraction process. In the ventricles, electrical activation begins at the insertion points of the Purkinje network in the endocardium. How does the diffusion component of the subsequent excitation wave propagate from the endocardium in a healthy heart wall without creating directional biases? We show that this is a consequence of the particular geometric organization of myocytes in the heart wall...
May 8, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29727635/endocardial-hippo-signaling-regulates-myocardial-growth-and-cardiogenesis
#8
Stanley Artap, Lauren J Manderfield, Cheryl L Smith, Andrey Poleshko, Haig Aghajanian, Kelvin See, Li Li, Rajan Jain, Jonathan A Epstein
The Hippo signaling pathway has been implicated in control of cell and organ size, proliferation, and endothelial-mesenchymal transformation. This pathway impacts upon two partially redundant transcription cofactors, Yap and Taz, that interact with other factors, including members of the Tead family, to affect expression of downstream genes. Yap and Taz have been shown to regulate, in a cell-autonomous manner, myocardial proliferation, myocardial hypertrophy, regenerative potential, and overall size of the heart...
May 1, 2018: Developmental Biology
https://www.readbyqxmd.com/read/29727513/unipolar-voltage-mapping-criteria-for-septal-aspect-of-right-ventricular-influence-of-aortic-root
#9
Iosif Kelesidis, Benoit Desjardins, Daniele Muser, Pasquale Santangeli, Erica S Zado, Francis E Marchlinski
INTRODUCTION: Unipolar voltage mapping through its wider "field of view" can identify substrate deeper to the endocardium on the right ventricular (RV) free wall and left ventricle. The reference value(s) for normal endocardial (ENDO) unipolar voltage (UNI) for the septal aspect of the right ventricle (RV) and the effect of the aortic root that is directly opposed to the posterior septal plane of the RV outflow tract (RVOT) have not been established. METHODS AND RESULTS: We performed detailed (185 ± 70, range 127-342 points) RV ENDO UNI maps in 9 patients without structural heart disease; 6 had magnetic resonance (MR) imaging; 5 were males; the mean age was 49 ± 11 years...
May 4, 2018: Journal of Cardiovascular Electrophysiology
https://www.readbyqxmd.com/read/29705972/p-tau-and-subunit-c-mitochondrial-atp-synthase-accumulation-in-the-central-nervous-system-of-a-woman-with-hurler-scheie-syndrome-treated-with-enzyme-replacement-therapy-for-12-years
#10
Hiroshi Kobayashi, Masamichi Ariga, Yohei Sato, Masako Fujiwara, Nei Fukasawa, Takahiro Fukuda, Hiroyuki Takahashi, Masahiro Ikegami, Motomichi Kosuga, Torayuki Okuyama, Yoshikatsu Eto, Hiroyuki Ida
We report an autopsy case of a woman with mucopolysaccharidosis type I (MPS I) Hurler-Scheie syndrome who was treated with enzyme replacement therapy (ERT) for 12 years. This was the first case of MPS I treated with ERT in Japan. Pathological analysis showed no glycosaminoglycan accumulation in the liver and spleen as a result of long-term ERT, although severe aortic stenosis, diffuse intimal hyperplasia of the coronary artery, and fibrous hypertrophy of the endocardium were observed. Additionally, we detected subunit c mitochondrial ATP synthase (SCMAS) accumulation and mild tauopathy (hyperphosphorylated tau or p-tau, both 3-repeat and 4-repeat tau accumulation) in the same area of the cerebral limbic system and central gray matter of the mid brain and pons...
April 29, 2018: JIMD Reports
https://www.readbyqxmd.com/read/29705358/abdominal-pain-of-cardiovascular-origin
#11
Pedro Epifânio, Maria Emanuel Amaral, Natália Noronha, Paula Martins, Dina Rodrigues, António Pires, Eduardo Castela
Infective endocarditis is a microbial infection of the endocardium and it is rare in the pediatric population. In children, congenital heart disease is one of the most important risk factors for developing infective endocarditis and can involve other structures in addition to cardiac valves. The prognosis is generally better than in other forms of endocarditis, although the average mortality rate in the pediatric population is 15-25%. Clinical manifestations can mimic other diseases such as meningitis and collagen-vascular disease or vasculitis...
April 25, 2018: Portuguese Journal of Cardiology: An Official Journal of the Portuguese Society of Cardiology
https://www.readbyqxmd.com/read/29684187/non-invasive-epicardial-and-endocardial-electrocardiographic-imaging-for-scar-related-ventricular-tachycardia
#12
Linwei Wang, Omar A Gharbia, Saman Nazarian, B Milan Horácek, John L Sapp
Aims: Contact mapping is currently used to guide catheter ablation of scar-related ventricular tachycardia (VT) but usually provides incomplete assessment of 3D re-entry circuits and their arrhythmogenic substrates. This study investigates the feasibility of non-invasive electrocardiographic imaging (ECGi) in mapping scar substrates and re-entry circuits throughout the epicardium and endocardium. Methods and results: Four patients undergoing endocardial and epicardial mapping and ablation of scar-related VT had computed tomography scans and a 120-lead electrocardiograms, which were used to compute patient-specific ventricular epicardial and endocardial unipolar electrograms (CEGMs)...
April 18, 2018: Europace: European Pacing, Arrhythmias, and Cardiac Electrophysiology
https://www.readbyqxmd.com/read/29662919/development-and-clinical-validation-of-a-hybrid-method-for-semiautomated-left-ventricle-endocardial-and-epicardial-boundary-extraction-on-cine-magnetic-resonance-images
#13
Mahammed Messadi, Abdelhafid Bessaid, Denis Mariano-Goulart, Fayçal Ben Bouallègue
We describe a hybrid method for left ventricle (LV) endocardial and epicardial segmentation on cardiac magnetic resonance (CMR) images requiring minimal operator intervention. Endocardium extraction results from the union of three independent estimations based on adaptive thresholding, region growing, and active contour with Chan-Vese energy function. Epicardium segmentation relies on conditional morphological dilation of the endocardial mask followed by active contour optimization. The proposed method was first evaluated using an open access database of 18 CMR for which expert manual contouring was available...
April 2018: Journal of Medical Imaging
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
#14
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/29653251/probabilistic-guidance-for-catheter-tip-motion-in-cardiac-ablation-procedures
#15
Mihaela Am Constantinescu, Su-Lin Lee, Sabine Ernst, Apit Hemakom, Danilo Mandic, Guang-Zhong Yang
Radiofrequency catheter ablation is one of the commonly available therapeutic methods for patients suffering from cardiac arrhythmias. The prerequisite of successful ablation is sufficient energy delivery at the target site. However, cardiac and respiratory motion, coupled with endocardial irregularities, can cause catheter drift and dispersion of the radiofrequency energy, thus prolonging procedure time, damaging adjacent tissue, and leading to electrical reconnection of temporarily ablated regions. Therefore, positional accuracy and stability of the catheter tip during energy delivery is of great importance for the outcome of the procedure...
March 23, 2018: Medical Image Analysis
https://www.readbyqxmd.com/read/29642708/coronary-artery-development-origin-malformations-and-translational-vascular-reparative-therapy
#16
Daryl Ramai, Jonathan Lai, Constantine Monzidelis, Sarath Reddy
After thickening of the cardiac chamber walls during embryogenesis, oxygen and nutrients can no longer be adequately supplied to cardiac cells via passive diffusion; therefore, a primitive vascular network develops to supply these vital structures. This plexus further matures into coronary arteries and veins, which ensures continued development of the heart. Various models have been proposed to account for the growth of the coronary arteries. However, lineage-tracing studies in the last decade have identified 3 major sources, namely, the proepicardium, the sinus venosus, and endocardium...
January 1, 2018: Journal of Cardiovascular Pharmacology and Therapeutics
https://www.readbyqxmd.com/read/29627686/sissr-simultaneous-subdivision-surface-registration-for-the-quantification-of-cardiac-function-from-computed-tomography-in-canines
#17
Davis M Vigneault, Amir Pourmorteza, Marvin L Thomas, David A Bluemke, J Alison Noble
Recent improvements in cardiac computed tomography (CCT) allow for whole-heart functional studies to be acquired at low radiation dose (<2mSv) and high-temporal resolution (<100ms) in a single heart beat. Although the extraction of regional functional information from these images is of great clinical interest, there is a paucity of research into the quantification of regional function from CCT, contrasting with the large body of work in echocardiography and cardiac MR. Here we present the Simultaneous Subdivision Surface Registration (SiSSR) method: a fast, semi-automated image analysis pipeline for quantifying regional function from contrast-enhanced CCT...
March 29, 2018: Medical Image Analysis
https://www.readbyqxmd.com/read/29625195/idiopathic-premature-ventricular-complexes-originating-from-the-distal-great-cardiac-vein-clinical-cardiac-and-electrophysiological-characteristics-and-catheter-ablation-outcome
#18
Wenkui Lv, Xianhui Zhou, Gulinuer Yiming, Ling Zhang, Qina Zhou, Yaodong Li, Qiang Xing, Jianghua Zhang, Yanmei Lu, Hongli Wang, Guiqiu Cao, Baopeng Tang
AIMS: Although catheter ablation for idiopathic ventricular arrhythmia (VA) has been generally well-established, VA originating from the great cardiac vein (GCV) may be clinically challenging due to its epicardial origin, proximity to coronary arteries and limited accessibility. The purpose of this study was to explore its electrophysiological characteristics and identify effective mapping/ablation strategies for idiopathic premature ventricular complexes (PVCs) originating from the GCV...
April 3, 2018: Life Sciences
https://www.readbyqxmd.com/read/29602442/-tropical-endomyocardial-fibrosis-perspectives
#19
M Lachaud, C Lachaud, D Sidi, A Menete, X Jouven, E Marijon, B Ferreira
Tropical endomyocardial fibrosis (FET) is a leading cause of heart failure and the most common restrictive cardiomyopathy worldwide. Extensive fibrosis of the ventricular endocardium causing architectural distortion, impaired filling and valvular insufficiency define the disease. Confined to peculiar and limited geographical areas, the aetiology remains blurred and it carries a grim prognosis. The changing burden reported recently in some endemic areas and the refinement of diagnostic tools have emphasized alternative routes for understanding and treatment of the disease...
March 27, 2018: Annales de Cardiologie et D'angéiologie
https://www.readbyqxmd.com/read/29599272/reprogramming-the-endocardium-trials-and-tribulations
#20
EDITORIAL
Dongying Chen, Michael Simons
No abstract text is available yet for this article.
March 30, 2018: Circulation Research
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