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left ventricular reconstruction

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https://www.readbyqxmd.com/read/29327252/compared-vulnerabilities-to-small-cardiac-motions-between-different-cameras-used-for-myocardial-perfusion-imaging
#1
Julien Salvadori, Yolande Petegnief, Remi Sabbah, Olivier Morel, Hatem Boulahdour, Gilles Karcher, Pierre-Yves Marie, Laetitia Imbert
This phantom-based study was aimed to determine whether cardiac CZT-cameras, which provide an enhanced spatial resolution and image contrast compared to Anger cameras, are similarly affected by small cardiac motions. Translations of a left ventricular (LV) insert at half-SPECT acquisitions through six possible orthogonal directions and with 5- or 10-mm amplitude were simulated on the Discovery NM-530c and DSPECT CZT-cameras and on an Anger Symbia T2 camera equipped with an astigmatic (IQ.SPECT) or conventional parallel-hole collimator (Conv...
January 11, 2018: Journal of Nuclear Cardiology: Official Publication of the American Society of Nuclear Cardiology
https://www.readbyqxmd.com/read/29317056/a-potentially-curative-fetal-intervention-for-hypoplastic-left-heart-syndrome
#2
Andrew T Hattam
Hypoplastic left heart syndrome (HLHS) encapsulates a spectrum of complex congenital cardiovascular malformations involving varying degrees of underdevelopment of the left-sided heart structures. However, despite improved survival rates since the introduction of staged surgical reconstruction, treatment options for HLHS remain palliative rather than curative. A major limiting factor in the development of definitive curative therapy for HLHS is an incomplete understanding of its pathogenesis. Currently, the aetiology HLHS is best conceptualised by the 'flow theory' of cardiogenesis, which states that normal cardiac development is reliant on the interrelationship of normal flow patterns of blood through the developing heart, and appropriate growth of the cardiac valves and myocardium...
January 2018: Medical Hypotheses
https://www.readbyqxmd.com/read/29276930/-perfusion-metabolic-myocardial-scintigraphy-in-prognosis-of-left-ventricular-remodeling-after-complex-surgical-treatment-of-ischemic-cardiomyopathy
#3
Y B Lishmanov, M O Gulya, K V Zavadovsky, S L Andreev, E A Alexandrova
PURPOSE: To study capabilities of perfusion-metabolic myocardial scintigraphy for prediction of the left ventricular (LV) reverse remodeling after comprehensive surgical treatment of ischemic cardiomyopathy (ICMP). METHODS: The study included ICMP patients aged 56±7 years (n=32) who underwent surgical correction of LV dysfunction (myocardial revascularization, LV reconstruction, and mitral valve restoration). Inclusion criteria were significant coronary artery disease; myocardial infarction; New York Heart Association (NYHA) class III-IV heart failure; LV ejection fraction (EF) ≤45%; LV end-systolic index (ESI) >60 mL/m2; and LV akinesia or dyskinesia according to echocardiography...
October 2017: Kardiologiia
https://www.readbyqxmd.com/read/29259502/left-ventricular-reconstruction-for-postinfarction-left-ventricular-aneurysm-review-of-surgical-techniques
#4
REVIEW
Andrea Ruzza, Lawrence S C Czer, Francisco Arabia, Roberta Vespignani, Fardad Esmailian, Wen Cheng, Michele A De Robertis, Alfredo Trento
Different surgical techniques, each with its own advantages and disadvantages, have been used to reverse adverse left ventricular remodeling due to postinfarction left ventricular aneurysm. The most appropriate surgical technique depends on the location and size of the aneurysm and the scarred tissue, the patient's preoperative characteristics, and surgeon preference. This review covers the reconstructive surgical techniques for postinfarction left ventricular aneurysm.
October 2017: Texas Heart Institute Journal
https://www.readbyqxmd.com/read/29248281/repair-of-a-quadricuspid-truncal-valve-by-tricuspidization-and-reconstruction-of-right-ventricular-outflow-tract-with-the-excised-truncal-cusp
#5
Ling-Yi Wei, Yih-Sharng Chen, Ing-Sh Chiu, Shu-Chien Huang
OBJECTIVE: Quadricuspid truncal valves are susceptible to regurgitation, and tricuspid configuration is considered more durable after repairing the truncal valve. We report a new method by excising the excessive truncal cuspid to reconstruct a new competent aortic valve. METHODS: Bilateral pulmonary banding failed to stabilize a 4-month-old baby with type I truncus arteriosus and quadricuspid truncal valve with severe regurgitation, so surgery was performed. The aorta was transected, and the pulmonary arteries was separated from the aorta...
November 16, 2017: Journal of Thoracic and Cardiovascular Surgery
https://www.readbyqxmd.com/read/29240067/-myocardial-protection-during-left-ventricular-reconstruction-in-patients-with-an-ejection-fraction-below-30
#6
V V Bazylev, E V Rosseĭkin, E E Kobzev, M E Evdokimov
Surgical reconstruction of the left ventricle is an effective method of treatment for ischaemic cardiomyopathy. One of the conditions of successful intervention is correctly choosing a method of intraoperative myocardial protection. Currently, two techniques of myocardial protection are used: cardioplegic cardiac arrest and continuous myocardial perfusion on the beating heart. A series of experimental studies demonstrated that myocardial oxygen requirements in ischaemic cardiomyopathy during permanent perfusion are three times higher than during cardioplegic cardiac arrest...
2017: Angiologii︠a︡ i Sosudistai︠a︡ Khirurgii︠a︡, Angiology and Vascular Surgery
https://www.readbyqxmd.com/read/29223306/diagnostic-accuracy-of-multi-lead-ecgs-obtained-using-a-pocket-sized-bipolar-handheld-event-recorder
#7
Ani Nigolian, Nicolas Dayal, Haïg Nigolian, Carine Stettler, Haran Burri
BACKGROUND: Handheld ECG event recorders are useful for rhythm monitoring but only record a single lead, which may limit interpretation. We sought to investigate if a multi-lead ECG may be reconstituted using this device, and aimed to evaluate diagnostic accuracy. METHODS: A commercially-available handheld bipolar ECG event recorder was used to reconstruct a 9-lead ECG (leads I, II and III, V1-6). Tracings were analyzed independently by a cardiologist and a fellow...
November 21, 2017: Journal of Electrocardiology
https://www.readbyqxmd.com/read/29222852/free-breathing-whole-heart-3d-cine-magnetic-resonance-imaging-with-prospective-respiratory-motion-compensation
#8
Mehdi H Moghari, Ashita Barthur, Maria E Amaral, Tal Geva, Andrew J Powell
PURPOSE: To develop and validate a new prospective respiratory motion compensation algorithm for free-breathing whole-heart 3D cine steady-state free precession (SSFP) imaging. METHODS: In a 3D cine SSFP sequence, 4 excitations per cardiac cycle are re-purposed to prospectively track heart position. Specifically, their 1D image is reconstructed and routed into the scanner's standard diaphragmatic navigator processing system. If all 4 signals are in end-expiration, cine image data from the entire cardiac cycle is accepted for image reconstruction...
December 8, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29189404/artifactual-appearance-of-thrombosis-on-using-metal-artifact-reduction-software-reconstruction-in-computed-tomographic-angiography
#9
Richard Thomas, Ayaz Aghayev, Michael L Steigner
The authors attempted to use metal artifact reduction software in 2 computed tomographic angiogram studies to decrease beam hardening. Although the beam hardening artifacts were reduced in the postprocessed images, there was an artifactual appearance of thrombosis in the adjacent arteries in the first case and in the inflow cannula of a left ventricular assist device in the second case. Comparison of the reconstructed images with the original images is therefore essential to avoid a misdiagnosis.
November 16, 2017: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/29188428/surgical-treatment-for-endocardial-radiofrequency-ablation-resistant-sustained-monomorphic-ventricular-tachycardia-with-mural-thrombus-including-dense-calcification-in-the-left-ventricle
#10
Takuya Higuchi, Yasushi Tsutsumi, Osamu Monta, Satoshi Asada, Ryota Matsumoto, Shouhei Yamada, Hirokazu Ohashi
Catheter ablation provides effective results for sustained monomorphic ventricular tachycardia (VT), but the presence of mural thrombus including dense calcification occasionally causes unfavorable outcomes. The case of a 67-year-old man in whom sustained monomorphic VT, which was resistant to endocardial radiofrequency ablation, in the presence of mural thrombus including dense calcification after coronary artery bypass grafting was successfully treated by left ventricular reconstruction with cryoablation is reported...
November 29, 2017: General Thoracic and Cardiovascular Surgery
https://www.readbyqxmd.com/read/29148430/low-dose-4d-cardiac-imaging-in-small-animals-using-dual-source-micro-ct
#11
Matthew Holbrook, Darin P Clark, Cristian T Badea
Micro-CT is widely used in preclinical studies, generating substantial interest in extending its capabilities in functional imaging applications such as blood perfusion and cardiac function. However, imaging cardiac structure and function in mice is challenging due to their small size and rapid heart rate. To overcome these challenges, we propose and compare improvements on two strategies for cardiac gating in dual-source, preclinical micro-CT: fast prospective gating (PG) and uncorrelated retrospective gating (RG)...
November 17, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/29126782/feasibility-and-limitations-of-mitral-valve-repair-with-or-without-left-ventricular-reconstruction-in-non-ischemic-dilated-cardiomyopathy
#12
Yasushige Shingu, Tomonori Ooka, Hiroki Katoh, Tsuyoshi Tachibana, Suguru Kubota, Yoshiro Matsui
BACKGROUND: Although non-transplant surgical interventions for non-ischemic dilated cardiomyopathy (NIDCM) are relatively effective, their feasibility and limitations have not been fully elucidated. The aim of this study was to define the feasibility and limitations of mitral valve repair, with or without surgical ventricular reconstruction for patients with NIDCM in terms of postoperative low cardiac output syndrome (LOS). METHODS: Twenty non-transplant candidates (aged 57±13 years) with NIDCM and significant mitral regurgitation had undergone mitral valve repair combined with submitral procedures...
November 7, 2017: Journal of Cardiology
https://www.readbyqxmd.com/read/29117866/ambulatory-systolic-blood-pressure-and-obesity-are-independently-associated-with-left-ventricular-hypertrophic-remodeling-in-children
#13
Linyuan Jing, Christopher D Nevius, Cassi M Friday, Jonathan D Suever, Arichanah Pulenthiran, Abba Mejia-Spiegeler, H Lester Kirchner, William J Cochran, Gregory J Wehner, Aftab S Chishti, Christopher M Haggerty, Brandon K Fornwalt
BACKGROUND: Children with obesity have hypertrophic cardiac remodeling. Hypertension is common in pediatric obesity, and may independently contribute to hypertrophy. We hypothesized that both the degree of obesity and ambulatory blood pressure (ABP) would independently associate with measures of hypertrophic cardiac remodeling in children. METHODS: Children, aged 8-17 years, prospectively underwent cardiovascular magnetic resonance (CMR) and ABP monitoring. Left ventricular (LV) mass indexed to height2...
November 9, 2017: Journal of Cardiovascular Magnetic Resonance
https://www.readbyqxmd.com/read/29106563/tailoring-device-settings-in-cardiac-resynchronization-therapy-using-electrograms-from-pacing-electrodes
#14
Elien B Engels, Masih Mafi-Rad, Ben J M Hermans, Alfonso Aranda, Antonius M W van Stipdonk, Michiel Rienstra, Coert O S Scheerder, Alexander H Maass, Frits W Prinzen, Kevin Vernooy
Aims: Left ventricular (LV) fusion pacing appears to be at least as beneficial as biventricular pacing in cardiac resynchronization therapy (CRT). Optimal LV fusion pacing critically requires adjusting the atrioventricular (AV)-delay to the delay between atrial pacing and intrinsic right ventricular (RV) activation (Ap-RV). We explored the use of electrogram (EGM)-based vectorloop (EGMV) derived from EGMs of implanted pacing leads to achieve optimal LV fusion pacing and to compare it with conventional approaches...
June 30, 2017: Europace: European Pacing, Arrhythmias, and Cardiac Electrophysiology
https://www.readbyqxmd.com/read/29067539/two-dimensional-xd-grasp-provides-better-image-quality-than-conventional-2d-cardiac-cine-mri-for-patients-who-cannot-suspend-respiration
#15
Eve Piekarski, Teodora Chitiboi, Rebecca Ramb, Larry A Latson, Puneet Bhatla, Li Feng, Leon Axel
OBJECTIVES: Residual respiratory motion degrades image quality in conventional cardiac cine MRI (CCMRI). We evaluated whether a free-breathing (FB) radial imaging CCMRI sequence with compressed sensing reconstruction [extradimensional (e.g. cardiac and respiratory phases) golden-angle radial sparse parallel, or XD-GRASP] could provide better image quality than a conventional Cartesian breath-held (BH) sequence in an unselected population of patients undergoing clinical CCMRI. MATERIALS AND METHODS: One hundred one patients who underwent BH and FB imaging in a midventricular short-axis plane at a matching location were included...
October 24, 2017: Magma
https://www.readbyqxmd.com/read/29060829/image-based-fluid-dynamics-analysis-of-left-ventricle-outflow-tract-pressure-gradient-after-deployment-transcatheter-mitral-valve
#16
Yousef Alharbi, Nigel H Lovell, James Otton, David Muller, Amr Al Abed, Socrates Dokos
The goal of this study was to develop an image-based model to computational investigate blood flow and pressure gradients resulting from left ventricular (LV) wall motion after the implantation of a mitral valve (MV) prosthesis. Two image-based 3D models were reconstructed from multi-slice computed tomography images obtained from patients undergoing transcatheter MV replacement. Navier-Stokes equations were then used to compute the fluid motion. Outflow tract obstruction of the models with MV prosthesis were identified by calculating the difference between LV systolic and aortic pressures...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/29059999/performance-of-compressive-sensing-for-the-reconstruction-of-different-qrs-pulses-in-ecg-signals
#17
Jeevan K Pant, Sridhar Krishnan
Compressive sensing (CS) is studied for the acquisition of different QRS complexes in ECG signals. By applying sparse binary measurement matrix and by applying regularization for promoting temporal correlation, performance of CS techniques for the reconstruction of ECG segments containing different QRS complexes, such as, normal QRS, paced QRS, right bundle branch block beat, left bundle branch block beat, and ventricular flutter beat, has been studied. Simulation results demonstrate that performance of CS differs with the types of beats, and ECG segments with well-known beats can be reconstructed with signal-to-noise ratio (SNR) approximately equal to 25dB for the realization of CS systems with compression ratio as high as 95%; for lower compression ratio much higher SNR can be attained...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/29050847/anomalous-origin-of-the-left-coronary-artery-from-the-pulmonary-artery-presenting-in-adulthood-a-french-nationwide-retrospective-study
#18
Laura Le Berre, Alban-Elouen Baruteau, Alain Fraisse, Dominique Boulmier, Maria Jimenez, Bruno Gallet, Karine Warin Fresse, Jacques Mansourati, Patrice Guerin
Anomalous origin of the left coronary artery from the pulmonary artery (ALCAPA) is a rare congenital heart disease usually diagnosed during the first months of life. Without surgical treatment, ALCAPA carries a high mortality risk, and disease presentation in adulthood is rare. We describe the diagnosis and management of patients presenting with ALCAPA in adulthood. This multicenter French nationwide retrospective study included adult patients diagnosed from 1980 to 2014. Eleven adult patients (mean age: 38 ± 17 years) were analyzed...
August 25, 2017: Seminars in Thoracic and Cardiovascular Surgery
https://www.readbyqxmd.com/read/29023351/rapid-deployment-aortic-valves-deliver-superior-hemodynamic-performance-in-vitro
#19
Lisong Ai, Harvey Chen, Virginia Lin, Vinayak N Bapat
OBJECTIVE: Clinical studies have demonstrated excellent hemodynamic performance of rapid deployment aortic valves; however, few studies have directly compared the performance of these valves with conventional bioprosthetic valves. Thus, the hemodynamic function of the EDWARDS INTUITY valve (rapid deployment valve) was compared with the Edwards Magna Ease valve in vitro (Edwards Lifesciences Corp, Irvine, CA USA). METHODS: Elastomeric material was used to create an aortic root model that included a left ventricular outflow tract and aortic annulus...
September 2017: Innovations: Technology and Techniques in Cardiothoracic and Vascular Surgery
https://www.readbyqxmd.com/read/29021848/scar-characteristics-derived-from-two-and-three-dimensional-reconstructions-of-cardiac-contrast-enhanced-magnetic-resonance-images-relationship-to-ventricular-tachycardia-inducibility-and-ablation-success
#20
Kazumasa Sonoda, Yasuo Okumura, Ichiro Watanabe, Koichi Nagashima, Hiroaki Mano, Rikitake Kogawa, Naoko Yamaguchi, Keiko Takahashi, Kazuki Iso, Kimie Ohkubo, Toshiko Nakai, Satoshi Kunimoto, Atsushi Hirayama
BACKGROUND: The relationship between cardiac contrast-enhanced magnetic resonance imaging (CE-MRI)-derived scar characteristics and substrate for ventricular tachycardia (VT) in patients with structural heart disease (SHD) has not been fully investigated. METHODS: This study included 51 patients (mean age, 63.3±15.1 years) who underwent CE-MRI with SHD and VT induction testing before ablation. Late gadolinium-enhanced (LGE) regions on MRI slices were quantified by thresholding techniques...
October 2017: Journal of Arrhythmia
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