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left ventricular reconstruction

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https://www.readbyqxmd.com/read/28065694/real-time-cardiac-magnetic-resonance-cine-imaging-with-sparse-sampling-and-iterative-reconstruction-for-left-ventricular-measures-comparison-with-gold-standard-segmented-steady-state-free-precession
#1
Gabriel C Camargo, Fernanda Erthal, Leticia Sabioni, Filipe Penna, Ralph Strecker, Michaela Schmidt, Michael O Zenge, Ronaldo de S L Lima, Ilan Gottlieb
BACKGROUND: Segmented cine imaging with a steady-state free-precession sequence (Cine-SSFP) is currently the gold standard technique for measuring ventricular volumes and mass, but due to multi breath-hold (BH) requirements, it is prone to misalignment of consecutive slices, time consuming and dependent on respiratory capacity. Real-time cine avoids those limitations, but poor spatial and temporal resolution of conventional sequences has prevented its routine application. We sought to examine the accuracy and feasibility of a newly developed real-time sequence with aggressive under-sampling of k-space using sparse sampling and iterative reconstruction (Cine-RT)...
January 6, 2017: Magnetic Resonance Imaging
https://www.readbyqxmd.com/read/28057275/anatomic-suitability-for-transcaval-access%C3%A2-based-on-computed-tomography
#2
REVIEW
Robert J Lederman, Adam B Greenbaum, Toby Rogers, Jaffar M Khan, Melissa Fusari, Marcus Y Chen
Transcaval access has been used successfully for over 200 transcatheter aortic valve replacements, large-bore percutaneous left ventricular assist devices, and thoracic endovascular aortic aneurysm repairs. This review teaches how to plan transcaval access and closure based on computed tomography. The main planning goals are to: 1) identify calcium-free crossing targets in the abdominal aorta along with optimal fluoroscopic projection angles and level with respect to lumbar vertebrae; 2) identify obstacles such as interposed bowel or pedunculated aortic atheroma; 3) plan covered stent bailout; and 4) identify jeopardized vascular branches such as renal arteries that might be obstructed by bailout covered stents if employed...
January 9, 2017: JACC. Cardiovascular Interventions
https://www.readbyqxmd.com/read/28056256/-strategies-for-surgical-treatment-of-ischemic-mitral-incompetence
#3
Z B Qiu, X Chen
Treatment of ischemic mitral incompetence (IMI) is an important problem in cardiovascular surgery, and it is arguing to the best strategies for surgical treatment of IMI. IMI can be quantitative assessment precisely by three-dimensional ultrasonic sound. Perioperative transesophageal echocardiography can acquire detailed information about IMI, but it is possible to underestimate the degree of IMI. The effective mitral regurgitation area at resting are the independently prognosis factor in patients with IMI...
January 1, 2017: Zhonghua Wai Ke za Zhi [Chinese Journal of Surgery]
https://www.readbyqxmd.com/read/28043462/right-ventricular-outflow-tract-reconstruction-with-a-polytetrafluoroethylene-monocusp-valve-a-20-year-experience
#4
Mohineesh Kumar, Mark W Turrentine, Mark D Rodefeld, Teresa Bell, John W Brown
In patients with tetralogy of Fallot (TOF), pulmonary atresia (PA), and other congenital right ventricular outflow tract (RVOT) malformations, polytetrafluoroethylene (PTFE) monocusp outflow tract patches (MOTP) relieve obstruction and provide pulmonary valve competence. The purpose of this study was to determine whether our PTFE-MOTP was an acceptable short- and mid-term remedy for patients with TOF or PA as assessed by freedom from severe pulmonary regurgitation and freedom from reoperation. From 1994-2014, 171 patients (mean age 1...
July 2016: Seminars in Thoracic and Cardiovascular Surgery
https://www.readbyqxmd.com/read/28034709/transcatheter-closure-of-perimembranous-ventricular-septal-defects-using-dual-wire-maintaining-technique
#5
Xu-Dong Xu, Li-Ming Gao, Yuan Bai, Zhi-Gang Zhang, Xiao-Hua You, Xian-Xian Zhao, Yong-Wen Qin
OBJECTIVE: The present study was designed to evaluate the safety and feasibility of transcatheter closure of perimembranous ventricular septal defects (PmVSDs) with dual wire-maintaining technique (DWMT). PATIENTS/METHODS: From January 2010 to December 2013, a total of 241 patients (men: 109, women: 132; mean age: 22.2±15.4 years) with congenital PmVSDs were randomised to either the conventional technique (CT) group (n=118) or the DWMT group (n=123). RESULTS: In the CT group, the track wire was withdrawn before occluder insertion...
December 7, 2016: Heart, Lung & Circulation
https://www.readbyqxmd.com/read/28032913/correction-of-hysteretic-respiratory-motion-in-spect-myocardial-perfusion-imaging-simulation-and-patient-studies
#6
Paul K R Dasari, Arda Könik, P Hendrik Pretorius, Karen L Johnson, William P Segars, Mohammed S Shazeeb, Michael A King
PURPOSE: Amplitude based respiratory gating is known to capture the extent of respiratory motion (RM) accurately but results in residual motion in the presence of respiratory hysteresis. In our previous study, we proposed and developed a novel approach to account for respiratory hysteresis by applying the Bouc-Wen (BW) model of hysteresis to external surrogate signals of anterior / posterior motion of the abdomen and chest with respiration. In this work using simulated and clinical SPECT myocardial perfusion imaging (MPI) studies, we investigate the effects of respiratory hysteresis and evaluate the benefit of correcting it using the proposed BW model in comparison with the abdomen signal typically employed clinically...
December 29, 2016: Medical Physics
https://www.readbyqxmd.com/read/28017577/ebstein-s-anomaly-genetics-clinical-manifestations-and-management
#7
REVIEW
Shi-Min Yuan
Ebstein's anomaly is uncommon. Genetic bases of this congenital heart defect may be related to the mutations in myosin heavy chain 7 and NKX2.5, among others. Asymptomatic patients with Ebstein's anomaly can be conservatively treated and kept under close follow-up, whereas surgical operation is indicated for those patients with evidence of right heart dilation and progressively impaired ventricular systolic function. A biventricular repair consisting of the reconstruction of a competent monocuspid tricuspid valve, right ventriculorrhaphy, subtotal atrial septal defect closure, and aggressive reduction atrioplasty is suitable for most patients, and 1...
November 19, 2016: Pediatrics and Neonatology
https://www.readbyqxmd.com/read/28012120/improvement-in-automated-quantitation-of-myocardial-perfusion-abnormality-by-using-iterative-reconstruction-image-in-combination-with-resolution-recovery-attenuation-and-scatter-corrections-for-the-detection-of-coronary-artery-disease
#8
Taiki Chono, Masahisa Onoguchi, Takayuki Shibutani, Akiyoshi Hashimoto, Tomoaki Nakata, Naoya Yama, Kazufumi Tsuchihashi, Masamitsu Hatakenaka
OBJECTIVE: An iterative reconstruction method in combination with resolution recovery, attenuation and scatter corrections (IR-RASC) can improve image quality. It, however, is undetermined whether this technique can improve the detection of coronary artery disease (CAD) when automated quantitative analysis is used. This study evaluated diagnostic values of IR-RASC in combination with automated quantitative analysis in stress myocardial perfusion imaging (MPI) in the CAD detection. METHODS: This study enrolled consecutive 64 patients (mean age 66...
December 24, 2016: Annals of Nuclear Medicine
https://www.readbyqxmd.com/read/28010875/achievements-and-limitations-of-a-strategy-of-rehabilitation-of-native-pulmonary-vessels-in-pulmonary-atresia-ventricular-septal-defect-and-major-aortopulmonary-collateral-arteries
#9
Jerome Soquet, Matthew Liava'a, Lucas Eastaugh, Igor E Konstantinov, Johann Brink, Christian P Brizard, Yves d'Udekem
BACKGROUND: A strategy of rehabilitation for pulmonary atresia, ventricular septal defect, and major aortopulmonary collateral arteries (PA/VSD/MAPCAs) comprises repetitive shunting and patching procedures of the central pulmonary arteries. We wanted to determine the feasibility and limitations of a strategy of rehabilitation. METHODS: The outcomes of 37 consecutive patients operated from June 2003 to December 2014 for PA/VSD/MAPCAs were reviewed. The patients were directed to a rehabilitation strategy, except when they presented in heart failure with very large collaterals...
December 20, 2016: Annals of Thoracic Surgery
https://www.readbyqxmd.com/read/28009961/a-perceval-valve-in-active-infective-bioprosthetic-valve-endocarditis-case-report
#10
Johanna Konertz, Marc Kastrup, Sascha Treskatsch, Pascal M Dohmen
The case is presented of a 72-year-old male patient suffering from active infective aortic prosthetic endocarditis two months after emergency surgery with aortic valve implantation, and who underwent aortic arch reconstruction using a Dacron patch, due to the spontaneous post-procedural migration of a transcatheter-implanted aortic valve. The heart team considered transcatheter valve implantation (TAVI) due to the increased operative risk demonstrated by a EuroSCORE II of 10.9%, including chronic obstructive pulmonary disease (GOLD 3), cirrhosis (Child-B), esophageal varicose stage 2, chronic renal failure stage 3, and reduced left ventricular ejection fraction...
July 2016: Journal of Heart Valve Disease
https://www.readbyqxmd.com/read/28009944/suture-forces-for-closure-of-transapical-transcatheter-aortic-valve-replacement-a-mathematical-model
#11
Liang Ge, Henrik Haraldsson, Michael D Hope, David Saloner, Julius M Guccione, Mark B Ratcliffe, Elaine E Tseng
BACKGROUND: Transcatheter aortic valve replacement (TAVR) has revolutionized the treatment of severe aortic stenosis in intermediate, high-risk, and inoperable patients. TAVR has multiple access routes, including transfemoral (TF), transapical (TA), direct aortic (DA), axillary, transcarotid, and transcaval. The most commonly applied algorithm is a TF-first approach, where only when patients are unsuitable for TF are alternatives such as TA considered. An infrequent - but dreaded - risk is left ventricular (LV) apical bleeding from tearing or rupture with the TA approach...
July 2016: Journal of Heart Valve Disease
https://www.readbyqxmd.com/read/28007290/dacron-skirt-reconstruction-of-the-left-ventricular-outflow-tract-extending-the-capabilities-of-a-valved-conduit
#12
Jai Raman, David T M Lai, Nikola Dobrilovic, Salim Aziz
Aortic root reconstruction in the setting of redo aortic valve procedures or infective endocarditis may be technically challenging, particularly because of variable destruction or distortion of the left ventricular outflow tract. Homograft aortic root replacement is an excellent option for aortic root abscesses but is limited by homograft availability. We describe a simple technique of a bioprosthetic valved conduit constructed on the table using a Dacron (DuPont, Wilmington, DE) skirt below the valve. The use of the Dacron skirt facilitates easy reconstruction of the left ventricular outflow tract...
January 2017: Annals of Thoracic Surgery
https://www.readbyqxmd.com/read/27970208/tct-815-clinical-benefits-of-less-invasive-device-based-left-ventricular-reconstruction-a-hybrid-option-for-patients-with-ischemic-cardiomyopathy
#13
Christoph Schmitz, Mauri Biffi, Horst Sievert, Petr Neuzil, Salvatore Brugaletta, Christian Frerker, Azfar Zaman, Luigi Fiocca, Louis Labrousse, Lon Annest
No abstract text is available yet for this article.
November 1, 2016: Journal of the American College of Cardiology
https://www.readbyqxmd.com/read/27923685/a-combined-cellular-and-surgical-ventricular-reconstruction-therapeutic-approach-produces-attenuation-of-remodeling-in-infarcted-rats
#14
Michael J Bonios, Maria Anastasiou-Nana, Despina N Perrea, Konstantinos Malliaras
BACKGROUND: Left ventricular reconstruction (LVR) has been shown to provide transient benefits in LV structure and function of infarcted hearts; however long-term results have been disappointing, as LVR-induced benefits are typically not sustained. We hypothesized that administration of cardiosphere-derived cells (CDCs), which promote myocardial repair and regeneration, may result in long-term preservation of the beneficial effects of LVR in ischemic cardiomyopathy. METHODS: Wistar Kyoto rats underwent myocardial infarction (MI) and two weeks later were randomized into 3 groups: in Group 1 (n=9) LVR was performed by plication of the infarcted apex and CDCs were injected in the infarct border zone (IBZ); group 2 animals (n=9) underwent LVR and received vehicle solution in the IBZ...
December 3, 2016: Hellenic Journal of Cardiology: HJC, Hellēnikē Kardiologikē Epitheōrēsē
https://www.readbyqxmd.com/read/27905543/rapid-functional-cardiac-imaging-after-gadolinium-injection-evaluation-of-a-highly-accelerated-sequence-with-sparse-data-sampling-and-iterative-reconstruction
#15
Johannes Budjan, Holger Haubenreisser, Thomas Henzler, Sonja Sudarski, Michaela Schmidt, Christina Doesch, Ibrahim Akin, Martin Borggrefe, Nadja M Meßner, Stefan O Schoenberg, Ulrike I Attenberger, Theano Papavassiliu
To generate a patient-friendly, time-efficient cardiac MRI examination protocol, a highly accelerated real-time CINE MR sequence (SSIR) was acquired in the idle time in between contrast injection and late gadolinium enhancement phase. 20 consecutive patients underwent a cardiac MRI examination including a multi-breath-hold sequence as gold standard (Ref) as well as SSIR sequences with (SSIR-BH) and without breath-hold (SSIR-nonBH). SSIR sequences were acquired 4 minutes after gadolinium injection. Right- (RV) and left-ventricular (LV) volumetric functional parameters were evaluated and compared between Ref and SSIR sequences...
December 1, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27904843/cardiac-surgery-in-africa-a-thirty-five-year-experience-on-open-heart-surgery-in-cote-d-ivoire
#16
Koffi Herve Yangni-Angate, Christophe Meneas, Florent Diby, Manga Diomande, Anicet Adoubi, Yves Tanauh
BACKGROUND: Few centers for open heart surgery (OHS) are in Sub-Saharan Africa. Lack of OHS results is also noted. By reporting our African experience on OHS, the aim of this study was to fill the gap. METHODS: It is a retrospective study on 2,612 patients who were subject to an OHS between 1978 and 2013. Data were collected from demographical, clinical, investigative studies, surgical and outcomes parameters. RESULTS: There were 1,475 cases of rheumatic heart diseases (RHD), 126 endomyocardial fibrosis (EMF), 741 congenital heart diseases (CHDs) and 270 various affections...
October 2016: Cardiovascular Diagnosis and Therapy
https://www.readbyqxmd.com/read/27900349/symptomatic-bilateral-coronary-artery-fistula-to-pulmonary-artery-in-elderly-patient
#17
Francisco Pereira da Silva, Paulo Donato, Henrique Donato, Elisabete Jorge, Maria Joao Ferreira, Filipe Caseiro-Alves
We report the imaging findings of an uncommon coronary vascular termination anomaly, with fistula to the pulmonary artery. This 70 year old female patient presented unstable angina, showing a coronary artery fistula depicted in coronary angiogram from the left coronary to the pulmonary artery, with no significant atherosclerotic pathology. Due to development of ventricular tachycardia in stress echocardiogram examination, she was proposed for coronary fistula closure. Coronary CT was performed for procedure planning and allowed the identification of a second unsuspected fistula from the right coronary to the right pulmonary artery...
2016: European Journal of Radiology Open
https://www.readbyqxmd.com/read/27885998/bi-ventricular-finite-element-model-of-right-ventricle-overload-in-the-healthy-rat-heart
#18
Fulufhelo Masithulela
BACKGROUND: The recognition of RV overpressure is critical to human life, as this may signify morbidity and mortality. Right ventricle (RV) dysfunction is understood to have an impact on the performance of the left ventricle (LV), but the mechanisms remain poorly understood. It is understood that ventricular compliance has the ability to affect cardiac performance. In this study, a bi-ventricular model of the rat heart was used in preference to other, single-ventricle models. Finite element analysis (FEA) of the bi-ventricular model provides important information on the function of the healthy heart...
November 25, 2016: Bio-medical Materials and Engineering
https://www.readbyqxmd.com/read/27885428/normative-biometry-of-the-fetal-brain-using-magnetic-resonance-imaging
#19
Vanessa Kyriakopoulou, Deniz Vatansever, Alice Davidson, Prachi Patkee, Samia Elkommos, Andrew Chew, Miriam Martinez-Biarge, Bibbi Hagberg, Mellisa Damodaram, Joanna Allsop, Matt Fox, Joseph V Hajnal, Mary A Rutherford
The fetal brain shows accelerated growth in the latter half of gestation, and these changes can be captured by 2D and 3D biometry measurements. The aim of this study was to quantify brain growth in normal fetuses using Magnetic Resonance Imaging (MRI) and to produce reference biometry data and a freely available centile calculator ( https://www.developingbrain.co.uk/fetalcentiles/ ). A total of 127 MRI examinations (1.5 T) of fetuses with a normal brain appearance (21-38 gestational weeks) were included in this study...
November 24, 2016: Brain Structure & Function
https://www.readbyqxmd.com/read/27866675/hemodynamics-of-patient-specific-aorta-pulmonary-shunt-configurations
#20
Senol Piskin, H Firat Altin, Okan Yildiz, Ihsan Bakir, Kerem Pekkan
Optimal hemodynamics in aorta-pulmonary shunt reconstruction is essential for improved post-operative recovery of the newborn congenital heart disease patient. However, prior to in vivo execution, the prediction of post-operative hemodynamics is extremely challenging due to the interplay of multiple confounding physiological factors. It is hypothesized that the post-operative performance of the surgical shunt can be predicted through computational blood flow simulations that consider patient size, shunt configuration, cardiac output and the complex three-dimensional disease anatomy...
January 4, 2017: Journal of Biomechanics
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