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https://www.readbyqxmd.com/read/29453675/evaluation-of-carotid-artery-elasticity-in-patients-with-uremia-by-echo-tracking
#1
Hong Liang, Dawei Wang, Guoying Che, Yanxin Su
PURPOSE: The purpose of this study was to compare the carotid artery wall elasticity between patients with uremia and controls using echo tracking (ET). METHODS: Ninety-three patients with uremia and 35 control subjects (Group A) were enrolled in this study. In the ET mode, the carotid artery elasticity parameters including stiffness index (β), pressure-strain elasticity modulus (EP), arterial compliance (AC), and one-point pulse wave velocity (PWVβ) were measured, and carotid intima-media thickness (IMT) was measured with B-mode ultrasonography...
February 16, 2018: Journal of Medical Ultrasonics
https://www.readbyqxmd.com/read/29428080/reliability-of-a-clinical-3d-freehand-ultrasound-technique-analyses-on-healthy-and-pathological-muscles
#2
Francesco Cenni, Simon-Henri Schless, Lynn Bar-On, Erwin Aertbeliën, Herman Bruyninckx, Britta Hanssen, Kaat Desloovere
BACKGROUND AND OBJECTIVE: 3D freehand Ultrasonography is a medical imaging technique that can be used to measure muscle and tendon morphological and structural properties, including volume, lengths and echo-intensity. These properties are clinically relevant in neurological disorders such as spastic cerebral palsy to monitor disease progression and evaluate the effect of treatment. This study presents a methodology for extracting these parameters along with a clinical reliability analysis for the data acquisition and processing...
March 2018: Computer Methods and Programs in Biomedicine
https://www.readbyqxmd.com/read/29427896/velocimetric-ultrasound-thermometry-applied-to-myocardium-protection-monitoring
#3
Céline Engrand, Didier Laux, Jean-Yves Ferrandis, Roland Demaria, Emmanuel Le Clézio
Tissue temperature control during cardiac surgery is crucial for myocardial protection. To preserve the tissue, a hypothermic cardioplegia is applied in order to decrease the heart temperature down to around 10°C. The monitoring of the thermal evolution of the myocardium is then of importance to minimize deleterious effects on the heart. The present work aims at evaluating the potential of an ultrasonic velocimetric thermometry on the monitoring of in vitro tissues heating. An indentation process is first proposed to identify the experimental linear relationship linking, in myocardia, the speed of the ultrasonic longitudinal wave to the tissue temperature...
February 1, 2018: Ultrasonics
https://www.readbyqxmd.com/read/29420830/acellular-therapeutic-approach-for-heart-failure-in%C3%A2-vitro-production-of-extracellular-vesicles-from-human-cardiovascular-progenitors
#4
Nadia El Harane, Anaïs Kervadec, Valérie Bellamy, Laetitia Pidial, Hany J Neametalla, Marie-Cécile Perier, Bruna Lima Correa, Léa Thiébault, Nicolas Cagnard, Angéline Duché, Camille Brunaud, Mathilde Lemitre, Jeanne Gauthier, Alexandra T Bourdillon, Marc P Renault, Yeranuhi Hovhannisyan, Solenne Paiva, Alexandre R Colas, Onnik Agbulut, Albert Hagège, Jean-Sébastien Silvestre, Philippe Menasché, Nisa K E Renault
Aims: We have shown that extracellular vesicles (EVs) secreted by embryonic stem cell-derived cardiovascular progenitor cells (Pg) recapitulate the therapeutic effects of their parent cells in a mouse model of chronic heart failure (CHF). Our objectives are to investigate whether EV released by more readily available cell sources are therapeutic, whether their effectiveness is influenced by the differentiation state of the secreting cell, and through which mechanisms they act. Methods and results: The total EV secreted by human induced pluripotent stem cell-derived cardiovascular progenitors (iPSC-Pg) and human induced pluripotent stem cell-derived cardiomyocytes (iPSC-CM) were isolated by ultracentrifugation and characterized by Nanoparticle Tracking Analysis, western blot, and cryo-electron microscopy...
February 6, 2018: European Heart Journal
https://www.readbyqxmd.com/read/29409435/simulation-for-competency-assessment-in-vascular-and-cardiac-ultrasound
#5
Florence H Sheehan, R Eugene Zierler
Healthcare providers who use peripheral vascular and cardiac ultrasound require specialized training to develop the technical and interpretive skills necessary to perform accurate diagnostic tests. Assessment of competence is a critical component of training that documents a learner's progress and is a requirement for competency-based medical education (CBME) as well as specialty certification or credentialing. The use of simulation for CBME in diagnostic ultrasound is particularly appealing since it incorporates both the psychomotor and cognitive domains while eliminating dependency on the availability of live patients with a range of pathology...
February 1, 2018: Vascular Medicine
https://www.readbyqxmd.com/read/29402309/embryonic-stem-cell-derived-cardiomyocytes-for-the-treatment-of-doxorubicin-induced-cardiomyopathy
#6
Danúbia Silva Dos Santos, Guilherme Visconde Brasil, Isalira Peroba Rezende Ramos, Fernanda Cristina Paccola Mesquita, Tais Hanae Kasai-Brunswick, Michelle Lopes Araújo Christie, Gustavo Monnerat Cahli, Raiana Andrade Quintanilha Barbosa, Sandro Torrentes da Cunha, Jonathas Xavier Pereira, Emiliano Medei, Antonio Carlos Campos de Carvalho, Adriana Bastos Carvalho, Regina Coeli Dos Santos Goldenberg
BACKGROUND: Doxorubicin (Dox) is a chemotherapy drug with limited application due to cardiotoxicity that may progress to heart failure. This study aims to evaluate the role of cardiomyocytes derived from mouse embryonic stem cells (CM-mESCs) in the treatment of Dox-induced cardiomyopathy (DIC) in mice. METHODS: The mouse embryonic stem cell (mESC) line E14TG2A was characterized by karyotype analysis, gene expression using RT-PCR and immunofluorescence. Cells were transduced with luciferase 2 and submitted to cardiac differentiation...
February 5, 2018: Stem Cell Research & Therapy
https://www.readbyqxmd.com/read/29395626/echocardiography-core-laboratory-reproducibility-of-cardiac-safety-assessments-in-cardio-oncology
#7
Michel G Khouri, Bonnie Ky, Gary Dunn, Ted Plappert, Virginia Englefield, Dawn Rabineau, Eric Yow, Huiman X Barnhart, Martin St John Sutton, Pamela S Douglas
BACKGROUND: As the potential for cancer therapy-related cardiac dysfunction is increasingly recognized, there is a need for the standardization of echocardiographic measurements and cut points to guide treatment. The aim of this study was to determine the reproducibility of cardiac safety assessments across two academic echocardiography core laboratories (ECLs) at the University of Pennsylvania and the Duke Clinical Research Institute. METHODS: To harmonize the application of guideline-recommended measurement conventions, the ECLs conducted multiple training sessions to align measurement practices for traditional and emerging assessments of left ventricular (LV) function...
January 30, 2018: Journal of the American Society of Echocardiography
https://www.readbyqxmd.com/read/29392347/diffusion-tensor-imaging-of-dystrophic-skeletal-muscle-comparison-of-two-segmentation-methods-adapted-to-chemical-shift-encoded-water-fat-mri
#8
S Keller, Z J Wang, A Aigner, A C Kim, A Golsari, H Kooijman, G Adam, J Yamamura
PURPOSE: To compare the influence of two different regions of interest (ROIs) on diffusion tensor metrics in dystrophic thigh muscles using a custom-made (whole muscle) ROI including and a selective ROI excluding areas of fatty replacement. METHODS: Diffusion tensor imaging (DTI) and chemical-shift-encoded water-fat magnetic resonance imaging (MRI) of the thigh was conducted on a 3-Tesla system in 15 cases with muscular dystrophy and controls. The ROIs were chosen according to patterns of fatty replacement on co-registered axial DTI and gradient echo sequence (GRE) images...
February 1, 2018: Clinical Neuroradiology
https://www.readbyqxmd.com/read/29390418/evaluation-of-carotid-arterial-elasticity-in-patients-with-obstructive-sleep-apnea-hypopnea-syndrome-by-two-dimensional-speckle-tracking-imaging
#9
Manjie You, Li Zhang, Lingyun Fang, Jie Li, Mingxing Xie
The objective is to evaluate carotid arterial elasticity in patients with obstructive sleep apnea hypopnea syndrome (OSAHS) by two-dimensional speckle tracking imaging (2D-STI).Sixty-two hospitalized patients with OSAHS and 20 healthy subjects were studied. The OSAHS patients were divided into 3 subgroups: a mild group, a moderate group, and severe group. All subjects underwent complete left common carotid artery (LCCA) examination by echo-tacking technique and 2D-STI. The stiffness parameter (β), elastic modulus (Eρ), stiffness β single pulse wave velocity (PWVβ), and arterial compliance (AC) were automatically calculated by echo-tracking technique...
December 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/29378441/real-time-3d-ultrasound-based-motion-tracking-for-the-treatment-of-mobile-organs-with-mr-guided-high-intensity-focused-ultrasound
#10
Pierre Bour, Valéry Ozenne, Fabrice Marquet, Baudouin Denis de Senneville, Erik Dumont, Bruno Quesson
INTRODUCTION: MRgHIFU treatments of mobile organs require locking the HIFU beam on the targeted tissue to maximize heating efficiency. We propose to use a standalone 3D ultrasound-based motion correction technique using the HIFU transducer in pulse-echo mode. Validation of the method was performed in vitro and in vivo in the liver of pig under MR-Thermometry. METHODS: 3D-motion estimation was implemented using ultrasonic speckle-tracking between consecutive acquisitions...
January 29, 2018: International Journal of Hyperthermia
https://www.readbyqxmd.com/read/29359352/investigating-the-accuracy-of-fatnav-derived-estimates-of-temporal-b0-changes-and-their-application-to-retrospective-correction-of-high-resolution-3d-gre-of-the-human-brain-at-7t
#11
Frédéric Gretsch, José P Marques, Daniel Gallichan
PURPOSE: To investigate the precision of estimates of temporal variations of magnetic field achievable by double-echo fat image navigators (FatNavs), and their potential application to retrospective correction of 3-dimensional gradient echo-based sequences. METHODS: Both head motion and temporal changes of B0 were tracked using double-echo highly accelerated 3-dimensional FatNavs as navigators, allowing estimation of the temporal changes in low spatial-order field coefficients...
January 22, 2018: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29321212/prognostic-value-of-right-ventricular-dysfunction-in-heart-failure-with-reduced-ejection-fraction-superiority-of-longitudinal-strain-over-tricuspid-annular-plane-systolic-excursion
#12
Erberto Carluccio, Paolo Biagioli, Gianfranco Alunni, Adriano Murrone, Cinzia Zuchi, Stefano Coiro, Clara Riccini, Anna Mengoni, Antonella D'Antonio, Giuseppe Ambrosio
BACKGROUND: In heart failure (HF) with reduced ejection fraction, right ventricular (RV) impairment, as defined by reduced tricuspid annular plane systolic excursion, is a predictor of poor outcome. However, peak longitudinal strain of RV free wall (RVFWS) has been recently proposed as a more accurate and sensitive tool to evaluate RV function. Accordingly, we investigated whether RVFWS could help refine prognosis of patients with HF with reduced ejection fraction in whom tricuspid annular plane systolic excursion is still preserved...
January 2018: Circulation. Cardiovascular Imaging
https://www.readbyqxmd.com/read/29319208/image-registration-to-compensate-for-epi-distortion-in-patients-with-brain-tumors-an-evaluation-of-tract-specific-effects
#13
Angela Albi, Antonio Meola, Fan Zhang, Pegah Kahali, Laura Rigolo, Chantal M W Tax, Pelin Aksit Ciris, Walid I Essayed, Prashin Unadkat, Isaiah Norton, Yogesh Rathi, Olutayo Olubiyi, Alexandra J Golby, Lauren J O'Donnell
BACKGROUND AND PURPOSE: Diffusion magnetic resonance imaging (dMRI) provides preoperative maps of neurosurgical patients' white matter tracts, but these maps suffer from echo-planar imaging (EPI) distortions caused by magnetic field inhomogeneities. In clinical neurosurgical planning, these distortions are generally not corrected and thus contribute to the uncertainty of fiber tracking. Multiple image processing pipelines have been proposed for image-registration-based EPI distortion correction in healthy subjects...
January 10, 2018: Journal of Neuroimaging: Official Journal of the American Society of Neuroimaging
https://www.readbyqxmd.com/read/29305613/optimized-time-resolved-echo-piv-ptv-measurements-elucidate-blood-flow-in-patients-with-left-ventricular-thrombus
#14
Kaushik Sampath, Thura T Harfi, Ricard/T George, Joseph Katz
Contrast ultrasound is a widely used clinical tool to obtain real-time qualitative blood flow assessments in the heart, liver, etc. Echocardiographic particle image velocimetry (echo-PIV) is a technique for obtaining quantitative velocity maps from contrast ultrasound images. However, unlike optical PIV, routine echo images are prone to non-uniform spatiotemporal variations in tracer distribution, making analysis difficult for standard PIV algorithms. This study introduces optimized procedures that integrate image enhancement, PIV and particle tracking velocimetry (PTV) to obtain reliable time-resolved 2D velocity distributions...
January 5, 2018: Journal of Biomechanical Engineering
https://www.readbyqxmd.com/read/29290033/effects-of-obesity-and-metabolic-syndrome-on-cardiovascular-outcomes-in-pediatric-kidney-transplant-recipients-a-longitudinal-study
#15
Kristen Sgambat, Sarah Clauss, K Y Lei, Juizhou Song, Shaik O Rahaman, Margaret Lasota, Asha Moudgil
BACKGROUND: Obesity and metabolic syndrome (MS) are common after kidney transplantation, but their contribution to adverse cardiovascular (CV) outcomes in children are not well known. A prospective, controlled, longitudinal cohort study was conducted to investigate the effects of obesity and MS on left ventricular hypertrophy (LVH) and myocardial strain in pediatric kidney transplant recipients. METHODS: Transplant recipients (n = 42) had anthropometrics [body mass index (BMI), waist circumference, waist-to-height ratio], biochemical parameters (fasting glucose, lipid panel, HbA1c%), and echocardiogram with speckle tracking analysis for strain measured at 1, 18, and 30 months post-transplant...
December 30, 2017: Pediatric Nephrology: Journal of the International Pediatric Nephrology Association
https://www.readbyqxmd.com/read/29277648/susceptibility-induced-distortion-that-varies-due-to-motion-correction-in-diffusion-mr-without-acquiring-additional-data
#16
Jesper L R Andersson, Mark S Graham, Ivana Drobnjak, Hui Zhang, Jon Campbell
Because of their low bandwidth in the phase-encode (PE) direction, the susceptibility-induced off-resonance field causes distortions in echo planar imaging (EPI) images. It is therefore crucial to correct for susceptibility-induced distortions when performing diffusion studies using EPI. The susceptibility-induced field is caused by the object (head) disrupting the field and it is typically assumed that it remains constant within a framework defined by the object, (i.e. it follows the object as it moves in the scanner)...
December 22, 2017: NeuroImage
https://www.readbyqxmd.com/read/29273250/clinical-utility-of-continuous-radial-magnetic-resonance-imaging-acquisition-at-3%C3%A2-t-in-real-time-patellofemoral-kinematic-assessment-a-feasibility-study
#17
Christopher J Burke, Daniel Kaplan, Tobias Block, Gregory Chang, Laith Jazrawi, Kirk Campbell, Michael Alaia
PURPOSE: To compare patellar instability with magnetic resonance imaging analysis using continuous real-time radial gradient-echo (GRE) imaging in the assessment of symptomatic patients and asymptomatic subjects. METHODS: Symptomatic patients with suspected patellofemoral maltracking and asymptomatic volunteers were scanned in real time by a radial 2-dimensional GRE sequence at 3 T in axial orientation at the patella level through a range of flexion-extension. The degree of lateral maltracking, as well as the associated tibial tubercle-trochlear groove distance and trochlea depth, was measured...
December 19, 2017: Arthroscopy: the Journal of Arthroscopic & related Surgery
https://www.readbyqxmd.com/read/29237765/sensing-in-a-noisy-world-lessons-from-auditory-specialists-echolocating-bats
#18
REVIEW
Aaron J Corcoran, Cynthia F Moss
All animals face the essential task of extracting biologically meaningful sensory information from the 'noisy' backdrop of their environments. Here, we examine mechanisms used by echolocating bats to localize objects, track small prey and communicate in complex and noisy acoustic environments. Bats actively control and coordinate both the emission and reception of sound stimuli through integrated sensory and motor mechanisms that have evolved together over tens of millions of years. We discuss how bats behave in different ecological scenarios, including detecting and discriminating target echoes from background objects, minimizing acoustic interference from competing conspecifics and overcoming insect noise...
December 15, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/29211878/normal-reference-values-of-multilayer-longitudinal-strain-according-to-age-decades-in-a-healthy-population-a-single-centre-experience
#19
Gian Marco Alcidi, Roberta Esposito, Vincenzo Evola, Ciro Santoro, Maria Lembo, Regina Sorrentino, Francesco Lo Iudice, Francesco Borgia, Giuseppina Novo, Bruno Trimarco, Patrizio Lancellotti, Maurizio Galderisi
Aims: Recent advancements in echocardiographic technology allow to analyse myocardial strain in multiple layers. Little is known about the impact of age on layer-specific longitudinal strain in healthy subjects. The aim of this study was to analyse the influence of age on multilayer longitudinal strain and establish normal reference values of layer-specific strain according to age decades in a healthy population referring to our echo laboratory using 2D speckle-tracking echocardiography with layer-specific software...
December 2, 2017: European Heart Journal Cardiovascular Imaging
https://www.readbyqxmd.com/read/29191613/abnormal-biventricular-performance-in-asymptomatic-adolescents-late-after-repaired-tetralogy-of-fallot-combined-two-dimensional-speckle-tracking-and-three-dimensional-echocardiography-study
#20
Ken-Pen Weng, Yu-Chi Hung, Shih-Hui Huang, Huang-Wei Wu, Kuang-Jen Chien, Chu-Chuan Lin, Hsu-Hsia Peng, Ming-Ting Wu
BACKGROUND: The aim of this prospective study was to assess biventricular performance in asymptomatic adolescents with repaired tetralogy of Fallot (TOF) using 2D speckle tracking and real time 3D echocardiography simultaneously. METHODS: We studied 31 patients with repaired TOF (M/F: 22/9, age: 16.1 ± 6.1 yrs) who had history of cardiac surgery with mean follow-up duration of 12.8 years, and 32 age- and sex-matched normal individuals (M/F: 23/9, age: 16.6 ± 5...
November 27, 2017: Journal of the Chinese Medical Association: JCMA
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