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https://www.readbyqxmd.com/read/28801688/-tricuspid-valve-regurgitation-indications-and-operative-techniques
#1
R Lange, N Piazza, T Günther
Functional tricuspid valve (TV) regurgitation secondary to left heart disease (e.g. mitral insufficiency and stenosis) is observed in 75% of the patients with TV regurgitation and is thus the most common etiology; therefore, the majority of patients who require TV surgery, undergo concomitant mitral and/or aortic valve surgery. Uncorrected moderate and severe TV regurgitation may persist or even worsen after mitral valve surgery, leading to progressive heart failure and death. Patients with moderate to severe TV regurgitation show a 3-year survival rate of 40%...
August 11, 2017: Herz
https://www.readbyqxmd.com/read/28800300/intraventricular-vector-flow-mapping-a-doppler-based-regularized-problem-with-automatic-model-selection
#2
Kondo Claude Assi, Etienne Gay, Christophe Chnafa, Simon Mendez, Franck Nicoud, Juan F P J Abascal, Pierre Lantelme, François Tournoux, Damien Garcia
We propose a regularized least-squares method for reconstructing 2D velocity vector fields within the left ventricular cavity from single-view color Doppler echocardiographic images. Vector flow mapping is formulated as a quadratic optimization problem based on an [Formula: see text]-norm minimization of a cost function composed of a Doppler data-fidelity term and a regularizer. The latter contains three physically interpretable expressions related to 2D mass conservation, Dirichlet boundary conditions, and smoothness...
August 11, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28795038/indentation-in-the-right-ventricle-by-an-incomplete-pericardium-on-3-dimensional-reconstructed-computed-tomography
#3
Hak Ju Kim, Jae Gun Kwak
We report the case of a 17-year-old girl who presented with an indentation in the right ventricle caused by an incomplete pericardium on preoperative 3-dimensional reconstructed computed tomography. She was to undergo surgery for a partial atrioventricular septal defect and secundum atrial septal defect. Preoperative electrocardiography revealed occasional premature ventricular beats. We found the absence of the left side of the pericardium intraoperatively, and this absence caused strangulation of the diaphragmatic surface of the right ventricle...
August 2017: Korean Journal of Thoracic and Cardiovascular Surgery
https://www.readbyqxmd.com/read/28765021/re-evaluation-of-classic-posterior-ventricular-puncture-sites-employing-a-three-dimensional-brain-simulation-model
#4
Keyvan Tayebi Meybodi, Ehsan Hoseinzadeh, Mostafa Ahmadi, Mohammad Taghvaei, Hooshang Saberi
OBJECTIVE: To revalidate the craniometric dimensions of classic posterior burr holes for ventricular catheter insertion in hydrocephalic patients, based on ideal catheter position on 3D simulated computed tomographic (CT) reconstruction model of the ventricles. METHODS: Fifteen hydrocephalic patients underwent multislice, thin-cut CT, in order to determine the Cartesian coordinates of a new point for optimal posterior ventricular catheterization, geomatrically. Then, success rate for ventricular puncture and the thickness of brain traversed by the catheter with 3 approaches (Frazier, Keen, and the suggested point) were compared...
July 29, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28761995/intermediate-term-thrombotic-risk-in-contemporary-total-cavo-pulmonary-connection-for-single-ventricle-circulations
#5
Jenna M Faircloth, Olivia Roe, Tarek Alsaied, Joseph S Palumbo, Alexander Vinks, Gruschen R Veldtman
Despite the common occurrence of thrombosis in Fontan circulations, the mid-term thrombotic risk beyond the first two postoperative years is poorly defined especially in total cavo pulmonary Fontan. This study examines the thrombotic incidence and risk beyond the first 2 years after contemporary Fontan surgery. Using a retrospective cohort study design, 89 Fontan patients, 50 male, were included and evaluated with a median of 8.3 years (IQR 6.8-11.4) follow-up. Hospital records were reviewed for known risk factors of thrombosis, thrombotic events, antiplatelet and anticoagulation management, and basic characteristics...
July 31, 2017: Journal of Thrombosis and Thrombolysis
https://www.readbyqxmd.com/read/28752325/single-stage-correction-for-taussig-bing-anomaly-associated-with-aortic-arch-obstruction
#6
Kai Luo, Jinghao Zheng, Shunmin Wang, Zhongqun Zhu, Botao Gao, Zhiwei Xu, Jinfen Liu
Taussig-Bing anomaly and aortic arch obstruction are two types of complex congenital cardiac malformations. Almost 50% of patients with Taussig-Bing anomaly have aortic arch obstruction. This report assesses the surgical outcomes of single-stage correction in neonates with both defects. Between November 2006 and November 2015, 39 neonates with Taussig-Bing anomaly and aortic arch obstruction (28 patients with coarctation of the aorta and 11 patients with interrupted aortic arch) underwent a one-stage arterial switch operation and aortic reconstruction...
July 27, 2017: Pediatric Cardiology
https://www.readbyqxmd.com/read/28740778/takotsubo-cardiomyopathy-after-head-and-neck-reconstructive-surgery
#7
Masanori Mori, Hayato Nagashima, Satoshi Akazawa, Noriko Saegusa, Yuichi Ichikawa, Kei Iida, Kotaro Yoshimura, Masahiro Nakagawa
Takotsubo cardiomyopathy (TCM) is a form of transient heart failure that clinically mimics acute coronary syndrome and is characterized by left ventricular wall motion abnormalities. The pathophysiology of TCM is not well established. TCM is often preceded by emotional or physical stress and may occur after surgery. We present 3 cases of TCM occurring after head and neck reconstructive surgery. Echocardiography plays a central role in the diagnosis of TCM. Left ventricular wall motion abnormalities extend beyond the territory of a single coronary artery...
June 2017: Plastic and Reconstructive Surgery. Global Open
https://www.readbyqxmd.com/read/28736832/three-dimensional-echocardiography-for-predicting-postoperative-ventricular-volumes-after-surgical-ventricular-reconstruction-of-left-ventricular-aneurysm-a-case-based-presentation
#8
María Teresa Politi, Martín Federico Vivas, Eduardo Filipini, Iván Chillik, Laura Mariana Riznyk, Gustavo Avegliano, Ricardo Ronderos
Three-dimensional transthoracic echocardiography (3DTTE) may have a role in predicting final left ventricular volumes and clinical response after the surgical ventricular reconstruction (SVR) of left ventricular aneurysms and pseudoaneurysms. Left ventricle final volumes can be calculated through "virtual aneurysmectomy." We present a patient with a huge ventricular dilation combined with myocardial dissection, localized wall rupture, and aneurysm of the left ventricular apex after acute myocardial infarction in which accurate predictions from 3DTTE suggest potential clinical value...
July 23, 2017: Echocardiography
https://www.readbyqxmd.com/read/28732009/effects-of-local-cardiac-denervation-on-cardiac-innervation-and-ventricular-arrhythmia-after-chronic-myocardial-infarction
#9
Xudong Liu, Lin Sun, Jugang Chen, Yingying Jin, Qing Liu, Zhongnan Xia, Liang Wang, Jingjie Li
BACKGROUND: Modulation of the autonomic nervous system (ANS) has already been demonstrated to display antiarrhythmic effects in patients and animals with MI. In this study, we investigated whether local cardiac denervation has any beneficial effects on ventricular electrical stability and cardiac function in the chronic phase of MI. METHODS: Twenty-one anesthetized dogs were randomly assigned into the sham-operated, MI and MI-ablation groups, respectively. Four weeks after local cardiac denervation, LSG stimulation was used to induce VPCs and VAs...
2017: PloS One
https://www.readbyqxmd.com/read/28726076/ejection-fraction-in-myocardial-perfusion-imaging-assessed-with-a-dynamic-phantom-comparison-between-iq-spect-and-lehr
#10
Eero Hippeläinen, Teemu Mäkelä, Touko Kaasalainen, Erna Kaleva
BACKGROUND: Developments in single photon emission tomography instrumentation and reconstruction methods present a potential for decreasing acquisition times. One of such recent options for myocardial perfusion imaging (MPI) is IQ-SPECT. This study was motivated by the inconsistency in the reported ejection fraction (EF) and left ventricular (LV) volume results between IQ-SPECT and more conventional low-energy high-resolution (LEHR) collimation protocols. IQ-SPECT and LEHR quantitative results were compared while the equivalent number of iterations (EI) was varied...
December 2017: EJNMMI Physics
https://www.readbyqxmd.com/read/28711164/on-estimating-intraventricular-hemodynamic-forces-from-endocardial-dynamics-a-comparative-study-with-4d-flow-mri
#11
Gianni Pedrizzetti, Per M Arvidsson, Johannes Töger, Rasmus Borgquist, Federico Domenichini, Håkan Arheden, Einar Heiberg
Intraventricular pressure gradients or hemodynamic forces, which are their global measure integrated over the left ventricular volume, have a fundamental importance in ventricular function. They may help revealing a sub-optimal cardiac function that is not evident in terms of tissue motion, which is naturally heterogeneous and variable, and can influence cardiac adaptation. However, hemodynamic forces are not utilized in clinical cardiology due to the unavailability of simple non-invasive measurement tools...
July 5, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28693641/arterial-switch-operation-in-patients-with-transposition-and-a-left-sided-aorta
#12
Sachin Talwar, Robert H Anderson, Pradeep Ramakrishnan, Amolkumar Bhoje, Saurabh Gupta, Shiv Kumar Choudhary, Balram Airan
OBJECTIVES: Arterial switch operation is the treatment of choice in infants with transposed arterial trunks. It is technically challenging to perform in patients having usual atrial arrangement and concordant atrioventricular connections but having a left-sided aorta. Correction in this setting requires surgical expertise and precision. Here we review our experience with such patients. METHODS: Between January, 2002 and October, 2013, the arterial switch operation was performed in 20 patients in the combination emphasised above...
July 11, 2017: Cardiology in the Young
https://www.readbyqxmd.com/read/28687216/left-ventricular-volume-measurements-with-free-breathing-respiratory-self-gated-3-dimensional-golden-angle-radial-whole-heart-cine-imaging-feasibility-and-reproducibility
#13
Karen Holst, Martin Ugander, Andreas Sigfridsson
PURPOSE: To develop and evaluate a free breathing respiratory self-gated isotropic resolution technique for left ventricular (LV) volume measurements. METHODS: A 3D radial trajectory with double golden-angle ordering was used for free-running data acquisition during free breathing in 9 healthy volunteers. A respiratory self-gating signal was extracted from the center of k-space and used with the electrocardiogram to bin all data into 3 respiratory and 25 cardiac phases...
July 5, 2017: Magnetic Resonance Imaging
https://www.readbyqxmd.com/read/28685253/detection-and-quantitation-of-right-ventricular-reversible-perfusion-defects-by-stress-spect-myocardial-perfusion-imaging-a-proof-of-principle-study
#14
Ayman A Farag, Jack Heo, Lindsey Tauxe, Pradeep Bhambhvani, Guido Germano, Paul Kavanagh, Ami E Iskandrian, Fadi G Hage
BACKGROUND: In patients with right dominant coronary circulation, the right ventricular (RV) myocardium and the inferior region of the left ventricular (LV) myocardium share a common source of blood flow. We hypothesized that stress/rest SPECT myocardial perfusion imaging (MPI) could detect reversible perfusion defects in the RV in some patients with LV inferior wall perfusion abnormalities. MATERIAL AND METHODS: We identified 2 groups of patients with LV inferior wall perfusion defects (with or without defects in other regions of LV myocardium) from our database...
July 6, 2017: Journal of Nuclear Cardiology: Official Publication of the American Society of Nuclear Cardiology
https://www.readbyqxmd.com/read/28681477/optimal-image-reconstruction-using-multidetector-row-computed-tomography-to-facilitate-cardiac-resynchronization-therapy
#15
Yu Izawa, Shumpei Mori, Tatsuya Nishii, Hiroki Matsuzoe, Hiroshi Imada, Hideya Suehiro, Kazuhiko Nakayama, Kensuke Matsumoto, Hidekazu Tanaka, Sei Fujiwara, Koji Fukuzawa, Ken-Ichi Hirata
Preprocedural recognition of the segment of latest mechanical contraction along with the anatomy of the coronary venous system is important for successful and effective cardiac resynchronization therapy. We present a case of ischemic cardiomyopathy who underwent implantation of a cardiac resynchronization therapy device with a defibrillator, which was facilitated by preprocedural computed tomographic images reconstructed to visualize the left ventricular slab and the coronary venous system simultaneously on the cardiac contour...
July 2017: Echocardiography
https://www.readbyqxmd.com/read/28670776/myocardial-protective-effect-of-antegrade-cardioplegic-cardiac-arrest-versus-ventricular-fibrillation-during-cardiopulmonary-bypass-on-immediate-postoperative-and-mid-term-left-ventricular-function-in-right-ventricular-outflow-tract-surgery
#16
Sang Yoon Kim, Sungkyu Cho, Ji-Hyun Lee, Jin-Tae Kim, Woong-Han Kim
The objective of this study is to examine the myocardial protective effect of antegrade cardioplegic cardiac arrest (ACC) versus ventricular fibrillation (VF) on short-term and mid-term left ventricular (LV) function in right ventricular outflow tract (RVOT) surgery. RVOT operations conducted from January 2006 to December 2015 were reviewed. The numbers of cases using ACC and VF were 71 and 49, respectively. Postoperative mortality and morbidity were compared between the two groups. Before and after propensity score matching, left ventricular ejection fraction (LVEF) and left ventricular end-systolic/end-diastolic diameter (LVESD/LVEDD) in echocardiography were measured immediately after operation and at mid-term follow-up between postoperative 6 and 24 months...
July 2, 2017: Artificial Organs
https://www.readbyqxmd.com/read/28670158/estimation-of-diastolic-filling-pressure-with-cardiac-ct-in-comparison-with-echocardiography-using-tissue-doppler-imaging-determination-of-optimal-ct-reconstruction-parameters
#17
Ji-Sun Hwang, Heon Lee, Bora Lee, Soo-Jeong Lee, Sung Shick Jou, Hyun Kyung Lim, Jon Suh
OBJECTIVE: To determine the optimal CT image reconstruction parameters for the measurement of early transmitral peak velocity (E), early peak mitral septal tissue velocity (E'), and E / E'. MATERIALS AND METHODS: Forty-six patients underwent simultaneous cardiac CT and echocardiography on the same day. Four CT datasets were reconstructed with a slice thickness/interval of 0.9/0.9 mm or 3/3 mm at 10 (10% RR-interval) or 20 (5% RR-interval) RR-intervals. The E was calculated by dividing the peak transmitral flow (mL/s) by the corresponding mitral valve area (cm(2))...
July 2017: Korean Journal of Radiology: Official Journal of the Korean Radiological Society
https://www.readbyqxmd.com/read/28667349/pediatric-320-row-cardiac-computed-tomography-using-electrocardiogram-gated-model-based-full-iterative-reconstruction
#18
Go Shirota, Eriko Maeda, Yoko Namiki, Razibul Bari, Kenji Ino, Rumiko Torigoe, Osamu Abe
BACKGROUND: Full iterative reconstruction algorithm is available, but its diagnostic quality in pediatric cardiac CT is unknown. OBJECTIVE: To compare the imaging quality of two algorithms, full and hybrid iterative reconstruction, in pediatric cardiac CT. MATERIALS AND METHODS: We included 49 children with congenital cardiac anomalies who underwent cardiac CT. We compared quality of images reconstructed using the two algorithms (full and hybrid iterative reconstruction) based on a 3-point scale for the delineation of the following anatomical structures: atrial septum, ventricular septum, right atrium, right ventricle, left atrium, left ventricle, main pulmonary artery, ascending aorta, aortic arch including the patent ductus arteriosus, descending aorta, right coronary artery and left main trunk...
June 30, 2017: Pediatric Radiology
https://www.readbyqxmd.com/read/28664198/3d-motion-modeling-and-reconstruction-of-left-ventricle-wall-in-cardiac-mri
#19
Dong Yang, Pengxiang Wu, Chaowei Tan, Kilian M Pohl, Leon Axel, Dimitris Metaxas
The analysis of left ventricle (LV) wall motion is a critical step for understanding cardiac functioning mechanisms and clinical diagnosis of ventricular diseases. We present a novel approach for 3D motion modeling and analysis of LV wall in cardiac magnetic resonance imaging (MRI). First, a fully convolutional network (FCN) is deployed to initialize myocardium contours in 2D MR slices. Then, we propose an image registration algorithm to align MR slices in space and minimize the undesirable motion artifacts from inconsistent respiration...
June 2017: Functional Imaging and Modeling of the Heart: ... International Workshop, FIMH ..., Proceedings. FIMH
https://www.readbyqxmd.com/read/28643891/direct-comparison-of-high-temporal-resolution-cine-mri-with-doppler-ultrasound-for-assessment-of-diastolic-dysfunction-in-mice
#20
Thomas A Roberts, Anthony N Price, Laurence H Jackson, Valerie Taylor, Anna L David, Mark F Lythgoe, Daniel J Stuckey
Diastolic dysfunction is a sensitive early indicator of heart failure and can provide additional data to conventional measures of systolic function. Transmitral Doppler ultrasound, which measures the one-dimensional flow of blood through the mitral valve, is currently the preferred method for the measurement of diastolic function, but the measurement of the left ventricular volume changes using high-temporal-resolution cinematic magnetic resonance imaging (CINE MRI) is an alternative approach which is emerging as a potentially more robust and user-independent technique...
June 23, 2017: NMR in Biomedicine
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