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https://www.readbyqxmd.com/read/28645011/transient-portal-venous-gas-associated-with-reversible-non-occlusive-mesenteric-ischemia-a-case-report
#1
Gaël Piton, Brice Paquette, Eric Delabrousse, Gilles Capellier
OBJECTIVES: To report the utility of abdominal ultrasonography (US) to identify the presence of portal venous gas (PVG) during non-occlusive mesenteric ischemia (NOMI), and to follow the disappearance of portal venous gas after resolution of the NOMI. DATA SOURCES: This was a clinical observation of a patient, with images of abdominal computed tomography (CT), and a video of portal venous gas identified by ultrasonography. DATA SYNTHESIS: We describe the case of an adult patient admitted to our ICU for NOMI developing 48h after cardiac surgery...
June 16, 2017: International Journal of Surgery Case Reports
https://www.readbyqxmd.com/read/28644903/changes-in-remote-myocardial-tissue-after-acute-myocardial-infarction-and-its-relation-to-cardiac-remodeling-a-cmr-t1-mapping-study
#2
P Stefan Biesbroek, Raquel P Amier, Paul F A Teunissen, Mark B M Hofman, Lourens F H J Robbers, Peter M van de Ven, Aernout M Beek, Albert C van Rossum, Niels van Royen, Robin Nijveldt
OBJECTIVES: To characterize the temporal alterations in native T1 and extracellular volume (ECV) of remote myocardium after acute myocardial infarction (AMI), and to explore their relation to left ventricular (LV) remodeling. METHODS: Forty-two patients with AMI successfully treated with primary PCI underwent cardiovascular magnetic resonance after 4-6 days and 3 months. Cine imaging, late gadolinium enhancement, and T1-mapping (MOLLI) was performed at 1.5T. T1 values were measured in the myocardial tissue opposite of the infarct area...
2017: PloS One
https://www.readbyqxmd.com/read/28644803/cardiac-strain-imaging-with-coherent-compounding-of-diverging-waves
#3
Julien Grondin, Vincent Sayseng, Elisa E Konofagou
Current methods of cardiac strain imaging at high frame rate suffer from motion matching artifacts or poor lateral resolution. Coherent compounding has been shown to improve echocardiographic image quality while maintaining high frame rate but has never been used to image cardiac strain. However, myocardial velocity can have an impact on coherent compounding due to displacements between frames. The objective of this study was to investigate the feasibility and performance of coherent compounding for cardiac strain imaging at a low and a high myocardial velocity...
June 20, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28643891/direct-comparison-of-high-temporal-resolution-cine-mri-with-doppler-ultrasound-for-assessment-of-diastolic-dysfunction-in-mice
#4
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
https://www.readbyqxmd.com/read/28642964/metastasis-of-breast-cancer-cells-to-the-bone-lung-and-lymph-nodes-promotes-resistance-to-ionizing-radiation
#5
Takamitsu Hara, Manabu Iwadate, Kazunoshin Tachibana, Satoshi Waguri, Seiichi Takenoshita, Nobuyuki Hamada
BACKGROUND: Metastasis represents the leading cause of breast cancer deaths, necessitating strategies for its treatment. Although radiotherapy is employed for both primary and metastatic breast cancers, the difference in their ionizing radiation response remains incompletely understood. This study is the first to compare the radioresponse of a breast cancer cell line with its metastatic variants and report that such metastatic variants are more radioresistant. MATERIALS AND METHODS: A luciferase expressing cell line was established from human basal-like breast adenocarcinoma MDA-MB-231 and underwent in vivo selections, whereby a cycle of inoculations into the left cardiac ventricle or the mammary fat pad of athymic nude mice, isolation of metastases to the bone, lung and lymph nodes visualized with bioluminescence imaging, and expansion of obtained cells was repeated twice or three times...
June 22, 2017: Strahlentherapie und Onkologie: Organ der Deutschen Röntgengesellschaft ... [et Al]
https://www.readbyqxmd.com/read/28642276/dedifferentiation-proliferation-and-redifferentiation-of-adult-mammalian-cardiomyocytes-after-ischemic-injury
#6
Wei Eric Wang, Liangpeng Li, Xuewei Xia, Wenbin Fu, Qiao Liao, Cong Lan, Dezhong Yang, Hongmei Chen, Rongchuan Yue, Cindy S Zeng, Lin Zhou, Bin Zhou, Dayue D Duan, Xiongwen Chen, Steven R Houser, Chunyu Zeng
Background -Adult mammalian hearts have a limited ability to generate new cardiomyocytes. Proliferation of existing adult cardiomyocytes (ACM) is a potential source of new cardiomyocytes. Understanding the fundamental biology of ACM proliferation could be of great clinical significance for treating myocardial infarction (MI). We aim to understand the process and regulation of ACM proliferation and its role in new cardiomyocyte formation of post-MI mouse hearts. Methods -β-actin-GFP transgenic mice and fate-mapping Myh6-MerCreMer-tdTomato/lacZ mice were used to trace the fate of ACMs...
June 22, 2017: Circulation
https://www.readbyqxmd.com/read/28642098/quantifying-left-atrial-structure-and-function-using-single-plane-tissue-tracking-cardiac-magnetic-resonance
#7
Susumu Tao, Luisa A Ciuffo, Joao A C Lima, Katherine C Wu, Hiroshi Ashikaga
PURPOSE: Left atrial (LA) structure and function are important markers of adverse cardiovascular outcomes. Tissue-tracking cardiovascular magnetic resonance (CMR) accurately quantifies LA volume, strain, and strain rate based on biplane long-axis imaging. We aimed to assess the accuracy of the LA indices quantification from single-plane tissue-tracking CMR. METHODS: We included 162 patients (mean age 56±15, male 70%) from a prospective cohort study whose cine CMR images in sinus rhythm were available in both four-chamber and two-chamber views...
June 19, 2017: Magnetic Resonance Imaging
https://www.readbyqxmd.com/read/28641319/understanding-scuba-diving-fatalities-carbon-dioxide-concentrations-in-intra-cardiac-gas
#8
Vincent Varlet, Alejandro Dominguez, Marc Augsburger, Maisy Lossois, Coraline Egger, Cristian Palmiere, Raquel Vilarino, Silke Grabherr
INTRODUCTION: Important developments in the diagnosis of scuba diving fatalities have been made thanks to forensic imaging tool improvements. Multi-detector computed tomography (MDCT) permits reliable interpretation of the overall gaseous distribution in the cadaver. However, due to post-mortem delay, the radiological interpretation is often doubtful because the distinction between gas related to the dive and post-mortem decomposition artifactual gases becomes less obvious. METHODS: We present six cases of fatal scuba diving showing gas in the heart and other vasculature...
June 2017: Diving and Hyperbaric Medicine: the Journal of the South Pacific Underwater Medicine Society
https://www.readbyqxmd.com/read/28641300/prenatal-diagnosis-of-dextrocardia-with-complex-congenital-heart-disease-using-fetal-intelligent-navigation-echocardiography-fine-and-a-literature-review
#9
Lami Yeo, Suchaya Luewan, Dor Markush, Navleen Gill, Roberto Romero
Fetal dextrocardia is a type of cardiac malposition where the major axis from base to apex points to the right side. This condition is usually associated with a wide spectrum of complex cardiac defects. As a result, dextrocardia is conceptually difficult to understand and diagnose on prenatal ultrasound. The advantage of four-dimensional sonography with spatiotemporal image correlation (STIC) is that this modality can facilitate fetal cardiac examination. A novel method known as fetal intelligent navigation echocardiography (FINE) allows automatic generation of nine standard fetal echocardiography views in normal hearts by applying intelligent navigation technology to STIC volume datasets...
June 23, 2017: Fetal Diagnosis and Therapy
https://www.readbyqxmd.com/read/28641242/arrhythmia-mechanism-and-scaling-effect-on-the-spectral-properties-of-electroanatomical-maps-with-manifold-harmonics
#10
Margarita Sanroman-Junquera, Inmaculada Mora-Jimenez, Arcadi Garcia-Alberola, Antonio J Caamano, Beatriz Trenor, Jose Luis Rojo-Alvarez
Spatial and temporal processing of intracardiac electrograms provides relevant information to support the arrhythmia ablation during electrophysiological studies. Current Cardiac Navigation Systems (CNS) and Electrocardiographic Imaging (ECGI) build detailed three-dimensional electroanatomical maps (EAM), which represent the spatial anatomical distribution of bioelectrical features, such as activation time or voltage. We present a principled methodology for spectral analysis of both EAM geometry and bioelectrical feature in CNS or ECGI, including their spectral representation, cut-off frequency, or spatial sampling rate (SSR)...
June 15, 2017: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/28641192/obstructive-neonatal-atrial-myxoma
#11
Federica Iezzi, Andrea Quarti, Alessandro Capestro, Marco Pozzi
INTRODUCTION: Cardiac myxoma is a benign neoplasm representing the most common primary cardiac tumor in adults, however it is unusual in neonates. It is represented by an endocardial mass that occupies the cardiac chamber. Although the majority of myxomas are attached to the fossa ovalis of the interatrial septum, they also attach to the walls of the cardiac chambers and to valve leaflets surfaces. Approximately 75% of myxomas are found in the left atrium, 20% are located in the right atrium, and rarely in the ventricles...
June 8, 2017: International Journal of Surgery Case Reports
https://www.readbyqxmd.com/read/28640451/cardiac-fibrosis-and-arrhythmogenesis
#12
My-Nhan Nguyen, Helen Kiriazis, Xiao-Ming Gao, Xiao-Jun Du
Myocardial injury, mechanical stress, neurohormonal activation, inflammation, and/or aging all lead to cardiac remodeling, which is responsible for cardiac dysfunction and arrhythmogenesis. Of the key histological components of cardiac remodeling, fibrosis either in the form of interstitial, patchy, or dense scars, constitutes a key histological substrate of arrhythmias. Here we discuss current research findings focusing on the role of fibrosis, in arrhythmogenesis. Numerous studies have convincingly shown that patchy or interstitial fibrosis interferes with myocardial electrophysiology by slowing down action potential propagation, initiating reentry, promoting after-depolarizations, and increasing ectopic automaticity...
June 18, 2017: Comprehensive Physiology
https://www.readbyqxmd.com/read/28640039/levosimendan-prevents-and-reverts-right-ventricular-failure-in-experimental-pulmonary-arterial-hypertension
#13
Mona Sahlholdt Hansen, Asger Andersen, Sarah Holmboe, Jacob Gammelgaard Schultz, Steffen Ringgaard, Ulf Simonsen, Chris Happé, Harm Jan Bogaard, Jens Erik Nielsen-Kudsk
BACKGROUND: We investigated whether chronic levosimendan treatment can prevent and revert right ventricular (RV) failure and attenuate pulmonary vascular remodelling in a rat model of pulmonary arterial hypertension (PAH). METHODS AND RESULTS: PAH was induced in rats by exposure to SU5416 and hypoxia (SuHx). The rats were randomized to levosimendan (3 mg/kg/day) initiated before SuHx (n=10, PREV), levosimendan started 6 weeks after SuHx (n=12, REV), or vehicle treatment (n=10, VEH)...
June 19, 2017: Journal of Cardiovascular Pharmacology
https://www.readbyqxmd.com/read/28639972/imaging-in-repaired-tetralogy-of-fallot-with-a-focus-on-recent-advances-in-echocardiography
#14
Guillermo Larios, Mark K Friedberg
PURPOSE OF REVIEW: Imaging is essential for the management of adults with repaired tetralogy of Fallot (rToF). Echocardiography and cardiac magnetic resonance imaging are the central modalities to assess rToF. Here we review recent literature on imaging rToF, focusing on echocardiography and advances in assessment of cardiac mechanics. RECENT FINDINGS: Several two-dimensional, three-dimensional, and Doppler echo parameters have been proposed to assess pulmonary regurgitation, right ventricular volumes and ejection fraction, but most of them still have important limitations in their feasibility and reliability compared to cardiac magnetic resonance (CMR)...
July 20, 2017: Current Opinion in Cardiology
https://www.readbyqxmd.com/read/28639927/carotid-artery-plaque-vulnerability-assessment-using-noninvasive-ultrasound-elastography-validation-with-mri
#15
Marie-Hélène Roy Cardinal, Maarten H G Heusinkveld, Zhao Qin, Richard G P Lopata, Cyrille Naim, Gilles Soulez, Guy Cloutier
OBJECTIVE: Vulnerable and nonvulnerable carotid artery plaques have different tissue morphology and composition that may affect plaque biomechanics. The objective of this study is to evaluate plaque vulnerability with the use of ultrasound noninvasive vascular elastography (NIVE). MATERIALS AND METHODS: Thirty-one patients (mean [± SD] age, 69 ± 7 years) with stenosis of the internal carotid artery of 50% or greater were enrolled in this cross-sectional study...
July 2017: AJR. American Journal of Roentgenology
https://www.readbyqxmd.com/read/28639400/motion-estimation-for-cardiac-functional-analysis-using-two-x-ray-computed-tomography-scans
#16
George S K Fung, Luisa Ciuffo, Hiroshi Ashikaga, Katsuyuki Taguchi
PURPOSE: This work concerns computed tomography (CT)-based cardiac functional analysis (CFA) with a reduced radiation dose. As CT-CFA requires images over the entire heartbeat, the scans are often performed at 10-20% of the tube current settings that are typically used for coronary CT angiography. A large image noise then degrades the accuracy of motion estimation. Moreover, even if the scan was performed during the sinus rhythm, the cardiac motion observed in CT images may not be cyclic with patients with atrial fibrillation...
June 22, 2017: Medical Physics
https://www.readbyqxmd.com/read/28639223/imaging-of-left-ventricular-hypertrophy-a-practical-utility-for-differential-diagnosis-and-assessment-of-disease-severity
#17
REVIEW
Toru Kubo, Hiroaki Kitaoka
PURPOSE OF REVIEW: Left ventricular hypertrophy (LVH) is often encountered in clinical practice, and it is a risk factor for cardiac mortality and morbidity. Determination of the etiology and disease severity is important for the management of patients with LVH. The aim of this review is to show the remarkable progress in cardiac imaging and its importance in clinical practice. RECENT FINDINGS: This review focuses on clinical features and characteristic cardiac imaging in LVH caused by various diseases including hypertension, aortic valve stenosis, hypertrophic cardiomyopathy, and secondary cardiomyopathies...
August 2017: Current Cardiology Reports
https://www.readbyqxmd.com/read/28638829/mitochondrial-targeted-molecular-imaging-in-cardiac-disease
#18
REVIEW
Jinhui Li, Jing Lu, You Zhou
The present study aimed to discuss the role of mitochondrion in cardiac function and disease. The mitochondrion plays a fundamental role in cellular processes ranging from metabolism to apoptosis. The mitochondrial-targeted molecular imaging could potentially illustrate changes in global and regional cardiac dysfunction. The collective changes that occur in mitochondrial-targeted molecular imaging probes have been widely explored and developed. As probes currently used in the preclinical setting still have a lot of shortcomings, the development of myocardial metabolic activity, viability, perfusion, and blood flow molecular imaging probes holds great potential for accurately evaluating the myocardial viability and functional reserve...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28638576/a-classic-case-of-arrhythmogenic-right-ventricular-cardiomyopathy-arvc-and-literature-review
#19
Htun Latt, Thein Tun Aung, Chanwit Roongsritong, David Smith
Arrhythmogenic Right Ventricular Cardiomyopathy (ARVC) is a relatively under-recognized hereditary cardiomyopathy. It is characterized pathologically by fibro-fatty infiltration of right ventricular (RV) myocardium and clinically by consequences of RV electrical instability. Timely intervention with device therapy and pharmacotherapy may help reduce the risk of arrhythmic events or sudden cardiac death. Here, we describe a classic case of a young adult with ARVC and a brief literature review. The patient presented with exertional palpitations and ARVC was suspected after his routine electrocardiogram (EKG) revealed symmetric T wave inversions and possible epsilon waves in right precordial leads...
March 2017: Journal of Community Hospital Internal Medicine Perspectives
https://www.readbyqxmd.com/read/28638298/uncertainty-of-myocardial-perfusion-imaging-in-chest-pain-risk-stratification
#20
Htoo Kyaw, Sivacharan Buddhavarapu, Joseph Abboud, Deepika Misra
BACKGROUND: Chest pain is a common presenting symptom in the emergency department (ED). Although the diagnostic workup for chest pain is well established, the best time to perform invasive cardiac catheterization in patients with low to moderate risk of coronary artery disease is still unclear, particularly if noninvasive tests such as the electrocardiogram (ECG) and nuclear myocardial perfusion scan show nonsignificant findings. CASE REPORT: We present the case of a 52-year-old female who presented to the ED with acute-onset chest pain that had started early in the morning while she was sleeping...
2017: Ochsner Journal
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