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Cardiac MR

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https://www.readbyqxmd.com/read/28546334/motion-corrected-imaging-of-the-aortic-valve-with-18-f-naf-pet-ct-and-pet-mr-a-feasibility-study
#1
Mhairi Katrina Doris, Mathieu Rubeaux, Tania Pawade, Yuka Otaki, Yibin Xie, Debiao Li, Balaji K Tamarappoo, David Newby, Daniel S Berman, Marc R Dweck, Piotr J Slomka, Damini Dey
Introduction: We investigated whether motion correction of gated (18)F-fluoride PET-CT and PET-MR of the aortic valve could improve PET quantitation and image quality. Methods: A diffeomorphic, mass-preserving, anatomy-guided registration algorithm was used to align PET images from 4 cardiac gates, preserving all counts, and applied to PET-MR and PET-CT data of six patients with aortic stenosis. Measured Signal-to-Noise Ratios (SNRs) and Target-to-Background Ratios (TBRs) were compared with the standard method of utilizing only the diastolic gate...
May 25, 2017: Journal of Nuclear Medicine: Official Publication, Society of Nuclear Medicine
https://www.readbyqxmd.com/read/28540212/infarct-characterization-using-ct
#2
REVIEW
Ludovico La Grutta, Patrizia Toia, Erica Maffei, Filippo Cademartiri, Roberto Lagalla, Massimo Midiri
Myocardial infarction (MI) is a major cause of death and disability worldwide. The incidence is not expected to diminish, despite better prevention, diagnosis and treatment, because of the ageing population in industrialized countries and unhealthy lifestyles in developing countries. Nowadays it is highly requested an imaging tool able to evaluate MI and viability. Technology improvements determined an expansion of clinical indications from coronary plaque evaluation to functional applications (perfusion, ischemia and viability after MI) integrating additional phases and information in the mainstream examination...
April 2017: Cardiovascular Diagnosis and Therapy
https://www.readbyqxmd.com/read/28540067/utility-of-cardiac-magnetic-resonance-for-evaluation-of-mitral-regurgitation-prior-to-mitral-valve-surgery
#3
REVIEW
Neil K Mehta, Jiwon Kim, Jonathan Y Siden, Sara Rodriguez-Diego, Javid Alakbarli, Antonino Di Franco, Jonathan W Weinsaft
Mitral regurgitation (MR) is a common cause of morbidity worldwide and an accepted indication for interventional therapies which aim to reduce or resolve adverse clinical outcomes associated with MR. Cardiac magnetic resonance (CMR) provides highly accurate means of assessing MR, including a variety of approaches that can measure MR based on quantitative flow. Additionally, CMR is widely accepted as a reference standard for cardiac chamber quantification, enabling reliable detection of subtle changes in cardiac chamber size and function so as to guide decision-making regarding timing of mitral valve directed therapies...
April 2017: Journal of Thoracic Disease
https://www.readbyqxmd.com/read/28527962/resolution-of-mitral-regurgitation-with-left-ventricular-assist-device-support
#4
Matthew Goodwin, Hassan W Nemeh, Jamil Borgi, Gaetano Paone, Jeffrey A Morgan
BACKGROUND: Cardiac valve disease is common in patients with end-stage heart failure undergoing left ventricular assist device implantation (LVAD). The aim of this study was to determine if preoperative mitral regurgitation (MR) affects outcomes and hemodynamics in patients after LVAD implantation. METHODS: From March 2006 through May 2015, 238 consecutive patients underwent LVAD implantation. Patient cohorts included less than moderate to severe MR (< moderate-severe, n = 195) and greater than or equal to moderate to severe MR (≥ moderate-severe, n = 43)...
May 17, 2017: Annals of Thoracic Surgery
https://www.readbyqxmd.com/read/28522095/the-reduction-of-central-sleep-apnoea-severity-in-the-left-lateral-position-is-not-due-to-an-improvement-in-cardiac-haemodynamics-in%C3%A2-patients-with-chronic-heart-failure
#5
Egidio Traversi, Davide Rossi, Roberto Maestri, Francesca Olmetti, Maria Teresa La Rovere, Gian Domenico Pinna
OBJECTIVE: The severity of central sleep apnoea (CSA), a common comorbidity in patients with chronic heart failure (CHF) and reduced ejection fraction, markedly decreases from the supine to the lateral sleeping position, with no difference between the left and right positions. The mechanisms responsible for this beneficial effect have not yet been elucidated. METHODS: We tested the hypothesis that CSA attenuation in the left lateral position is due, at least in part, to an improvement in cardiac haemodynamics...
June 2017: Sleep Medicine
https://www.readbyqxmd.com/read/28516504/prognostic-potential-of-midregional-pro-adrenomedullin-following-decompensation-for-systolic-heart-failure-comparison-with-cardiac-natriuretic-peptides
#6
Caroline Morbach, Almuth Marx, Mathias Kaspar, Gülmisal Güder, Susanne Brenner, Carolin Feldmann, Stefan Störk, Jörn O Vollert, Georg Ertl, Christiane E Angermann
AIMS: Whereas guidelines recommend the routine use of natriuretic peptides (NPs) in heart failure (HF) care, the clinical relevance and prognostic potential of midregional pro-adrenomedullin (MR-proADM) is less well established. We aimed to compare the prognostic potential of MR-proADM after acute decompensation for systolic HF with that of N-terminal pro-B-type natriuretic peptide (NT-proBNP) and midregional pro-atrial NP (MR-proANP), to investigate the significance of high/rising MR-proADM, and to evaluate the incremental prognostic yield of repeat measurements...
May 17, 2017: European Journal of Heart Failure
https://www.readbyqxmd.com/read/28507825/spatiotemporal-strategies-for-joint-segmentation-and-motion-tracking-from-cardiac-image-sequences
#7
Huafeng Liu, Ting Wang, Lei Xu, Pengcheng Shi
Although accurate and robust estimations of the deforming cardiac geometry and kinematics from cine tomographic medical image sequences remain a technical challenge, they have significant clinical value. Traditionally, boundary or volumetric segmentation and motion estimation problems are considered as two sequential steps, even though the order of these processes can be different. In this paper, we present an integrated, spatiotemporal strategy for the simultaneous joint recovery of these two ill-posed problems...
2017: IEEE Journal of Translational Engineering in Health and Medicine
https://www.readbyqxmd.com/read/28506541/mitral-regurgitation-grading-in-the-operating-room-a-systematic-review-and-meta-analysis-comparing-preoperative-and-intraoperative-assessments-during-cardiac-surgery
#8
Filippo Sanfilippo, Christopher Johnson, Diego Bellavia, Marco Morsolini, Giuseppe Romano, Cristina Santonocito, Luigi Centineo, Federico Pastore, Michele Pilato, Antonio Arcadipane
OBJECTIVE: To assess differences in mitral regurgitation (MR) grade between the preoperative and the intraoperative evaluations. DESIGN: Systematic review and meta-analysis of 6 observational studies found from MEDLINE and EMBASE. SETTING: Cardiac surgery. PARTICIPANTS: One hundred thirty-seven patients. INTERVENTION: Comparison between the preoperative MR assessment and the intraoperative evaluation conducted under general anesthesia (GA), with or without "hemodynamic matching" (HM) (artificial increase of afterload)...
February 13, 2017: Journal of Cardiothoracic and Vascular Anesthesia
https://www.readbyqxmd.com/read/28497486/5d-whole-heart-sparse-mri
#9
Li Feng, Simone Coppo, Davide Piccini, Jerome Yerly, Ruth P Lim, Pier Giorgio Masci, Matthias Stuber, Daniel K Sodickson, Ricardo Otazo
PURPOSE: A 5D whole-heart sparse imaging framework is proposed for simultaneous assessment of myocardial function and high-resolution cardiac and respiratory motion-resolved whole-heart anatomy in a single continuous noncontrast MR scan. METHODS: A non-electrocardiograph (ECG)-triggered 3D golden-angle radial balanced steady-state free precession sequence was used for data acquisition. The acquired 3D k-space data were sorted into a 5D dataset containing separated cardiac and respiratory dimensions using a self-extracted respiratory motion signal and a recorded ECG signal...
May 11, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28493792/transthoracic-echocardiography-pitfalls-and-limitations-as-delineated-at-cardiac-ct-and-mr-imaging-erratum
#10
Sachin B Malik, Natalie Chen, Rex A Parker, Joe Y Hsu
No abstract text is available yet for this article.
May 2017: Radiographics: a Review Publication of the Radiological Society of North America, Inc
https://www.readbyqxmd.com/read/28493526/real-time-mri-guidance-of-cardiac-interventions
#11
Adrienne E Campbell-Washburn, Mohammad A Tavallaei, Mihaela Pop, Elena K Grant, Henry Chubb, Kawal Rhode, Graham A Wright
Cardiac magnetic resonance imaging (MRI) is appealing to guide complex cardiac procedures because it is ionizing radiation-free and offers flexible soft-tissue contrast. Interventional cardiac MR promises to improve existing procedures and enable new ones for complex arrhythmias, as well as congenital and structural heart disease. Guiding invasive procedures demands faster image acquisition, reconstruction and analysis, as well as intuitive intraprocedural display of imaging data. Standard cardiac MR techniques such as 3D anatomical imaging, cardiac function and flow, parameter mapping, and late-gadolinium enhancement can be used to gather valuable clinical data at various procedural stages...
May 11, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28490521/survival-in-women-versus-men-following-implantation-of-pacemakers-defibrillators-and-cardiac-resynchronization-therapy-devices-in-a-large-nationwide-cohort
#12
Niraj Varma, Suneet Mittal, Julie B Prillinger, Jeff Snell, Nirav Dalal, Jonathan P Piccini
BACKGROUND: Whether outcomes differ between sexes following treatment with pacemakers (PM), implantable cardioverter defibrillators, and cardiac resynchronization therapy (CRT) devices is unclear. METHODS AND RESULTS: Consecutive US patients with newly implanted PM, implantable cardioverter defibrillators, and CRT devices from a large remote monitoring database between 2008 and 2011 were included in this observational cohort study. Sex-specific all-cause survival postimplant was compared within each device type using a multivariable Cox proportional hazards model, stratified on age and adjusted for remote monitoring utilization and ZIP-based socioeconomic variables...
May 10, 2017: Journal of the American Heart Association
https://www.readbyqxmd.com/read/28486936/effects-of-inaccuracies-in-arterial-path-length-measurement-on-differences-in-mri-and-tonometry-measured-pulse-wave-velocity
#13
Jonathan R Weir-McCall, Faisel Khan, Deirdre B Cassidy, Arsh Thakur, Jennifer Summersgill, Shona Z Matthew, Fiona Adams, Fiona Dove, Stephen J Gandy, Helen M Colhoun, Jill Jf Belch, J Graeme Houston
BACKGROUND: Carotid-femoral pulse wave velocity (cf-PWV) and aortic PWV measured using MRI (MRI-PWV) show good correlation, but with a significant and consistent bias across studies. The aim of the current study was to evaluate whether the differences between cf.-PWV and MRI-PWV can be accounted for by inaccuracies of currently used distance measurements. METHODS: One hundred fourteen study participants were recruited into one of 4 groups: Type 2 diabetes melltus (T2DM) with cardiovascular disease (CVD) (n = 23), T2DM without CVD (n = 41), CVD without T2DM (n = 25) and a control group (n = 25)...
May 10, 2017: BMC Cardiovascular Disorders
https://www.readbyqxmd.com/read/28485324/a-novel-porcine-model-of-septic-shock-induced-by-acute-respiratory-distress-syndrome-due-to-methicillin-resistant-staphylococcus-aureus
#14
Shuo Wang, Jun-Yu Wang, Tao Wang, Chen-Chen Hang, Rui Shao, Chun-Sheng Li
BACKGROUND: Sepsis is one of the main causes of mortality in critically ill patients following progression to septic shock. To investigate the pathophysiologic changes of sepsis, we developed a novel porcine model of septic shock induced by acute respiratory distress syndrome (ARDS) due to methicillin-resistant Staphylococcus aureus(MRSA) pneumonia. METHODS: Twenty-six male Landraces (Lvyuanweiye, Beijing, China) weighing 30 ± 2 kg were divided into four groups: sham group (SH; n = 5); cotton smoke inhalation group (SM; n = 6); MRSA pneumonia group (MR; n = 6); and septic shock group with cotton smoke inhalation + MRSA pneumonia (SS; n = 9)...
May 20, 2017: Chinese Medical Journal
https://www.readbyqxmd.com/read/28477167/cardiovascular-magnetic-resonance-myocardial-t1-mapping-to-detect-and-quantify-cardiac-involvement-in-familial-amyloid-polyneuropathy
#15
Seitaro Oda, Daisuke Utsunomiya, Kosuke Morita, Takeshi Nakaura, Hideaki Yuki, Masafumi Kidoh, Kenichiro Hirata, Narumi Taguchi, Noriko Tsuda, Shinya Shiraishi, Tomohiro Namimoto, Kyoko Hirakawa, Seiji Takashio, Yasuhiro Izumiya, Megumi Yamamuro, Seiji Hokimoto, Kenichi Tsujita, Mitsuharu Ueda, Taro Yamashita, Yukio Ando, Yasuyuki Yamashita
OBJECTIVES: This study sought to explore the potential role of non-contrast T1 mapping for the detection and quantification of cardiac involvement in familial amyloid polyneuropathy (FAP). METHODS: Japanese patients with FAP [n = 41, age 53.2 ± 13.9 years, genotype Val30Met (n = 25), non-Val30Met (n = 16)] underwent cardiac magnetic resonance imaging that included T1 mapping (saturation-recovery method) and late gadolinium-enhanced (LGE) imaging on a 3...
May 5, 2017: European Radiology
https://www.readbyqxmd.com/read/28476142/dipeptidyl-peptidase-4-dpp-4-inhibition-with-linagliptin-reduces-western-diet-induced-myocardial-traf3ip2-expression-inflammation-and-fibrosis-in-female-mice
#16
Annayya R Aroor, Javad Habibi, Hemanth Kumar Kandikattu, Mona Garro-Kacher, Brady Barron, Dongqing Chen, Melvin R Hayden, Adam Whaley-Connell, Shawn B Bender, Thomas Klein, Jaume Padilla, James R Sowers, Bysani Chandrasekar, Vincent G DeMarco
BACKGROUND: Diastolic dysfunction (DD), a hallmark of obesity and primary defect in heart failure with preserved ejection fraction, is a predictor of future cardiovascular events. We previously reported that linagliptin, a dipeptidyl peptidase-4 inhibitor, improved DD in Zucker Obese rats, a genetic model of obesity and hypertension. Here we investigated the cardioprotective effects of linagliptin on development of DD in western diet (WD)-fed mice, a clinically relevant model of overnutrition and activation of the renin-angiotensin-aldosterone system...
May 5, 2017: Cardiovascular Diabetology
https://www.readbyqxmd.com/read/28470915/comparison-of-fast-acquisition-strategies-in-whole-heart-four-dimensional-flow-cardiac-mr-two-center-1-5-tesla-phantom-and-in-vivo-validation-study
#17
Pankaj Garg, Jos J M Westenberg, Pieter J van den Boogaard, Peter P Swoboda, Rahoz Aziz, James R J Foley, Graham J Fent, F G J Tyl, L Coratella, Mohammed S M ElBaz, R J van der Geest, David M Higgins, John P Greenwood, Sven Plein
PURPOSE: To validate three widely-used acceleration methods in four-dimensional (4D) flow cardiac MR; segmented 4D-spoiled-gradient-echo (4D-SPGR), 4D-echo-planar-imaging (4D-EPI), and 4D-k-t Broad-use Linear Acquisition Speed-up Technique (4D-k-t BLAST). MATERIALS AND METHODS: Acceleration methods were investigated in static/pulsatile phantoms and 25 volunteers on 1.5 Tesla MR systems. In phantoms, flow was quantified by 2D phase-contrast (PC), the three 4D flow methods and the time-beaker flow measurements...
May 4, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28452560/effects-of-a-cardiac-rehabilitation-programme-on-plasma-cardiac-biomarkers-in-patients-with-chronic-heart-failure
#18
Gilles Billebeau, Nicolas Vodovar, Malha Sadoune, Jean-Marie Launay, Florence Beauvais, Alain Cohen-Solal
Background Cardiac rehabilitation (CR) improves the symptoms, exercise capacity and quality of life of chronic heart failure (CHF) patients. Its effects on new plasma biomarkers of prognostic importance are unknown. The present study aimed at analysing the effects of a structured CR programme on plasma cardiac biomarkers in a large population of patients with CHF and reduced left ventricular ejection fraction (LVEF). Methods We enrolled 107 consecutive CHF patients with LVEF ≤ 45% in an ambulatory CR programme...
January 1, 2017: European Journal of Preventive Cardiology
https://www.readbyqxmd.com/read/28444164/vena-contracta-area-for-severity-grading-in-functional-and-degenerative-mitral-regurgitation-a-transoesophageal-3d-colour-doppler-analysis-in-500-patients
#19
Björn Goebel, Roland Heck, Ali Hamadanchi, Sylvia Otto, Torsten Doenst, Christian Jung, Alexander Lauten, Hans R Figulla, P Christian Schulze, Tudor C Poerner
Aims: Vena contracta area (VCA3D), derived by 3D colour Doppler echocardiography, has already been validated against cardiac magnetic resonance imaging, but the number of clinical studies to define cut-off values for grading of mitral regurgitation (MR) is limited. Aim of the study was to assess VCA3D in a large population of patients with functional (FMR) and degenerative MR (DMR). Methods and results: Transoesophageal echocardiography was performed in 500 patients with MR...
April 21, 2017: European Heart Journal Cardiovascular Imaging
https://www.readbyqxmd.com/read/28437634/convolutional-neural-network-regression-for-short-axis-left-ventricle-segmentation-in-cardiac-cine-mr-sequences
#20
Li Kuo Tan, Yih Miin Liew, Einly Lim, Robert A McLaughlin
Automated left ventricular (LV) segmentation is crucial for efficient quantification of cardiac function and morphology to aid subsequent management of cardiac pathologies. In this paper, we parameterize the complete (all short axis slices and phases) LV segmentation task in terms of the radial distances between the LV centerpoint and the endo- and epicardial contours in polar space. We then utilize convolutional neural network regression to infer these parameters. Utilizing parameter regression, as opposed to conventional pixel classification, allows the network to inherently reflect domain-specific physical constraints...
April 12, 2017: Medical Image Analysis
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