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https://www.readbyqxmd.com/read/29450717/prediction-of-infarct-size-and-adverse-cardiac-outcomes-by-tissue-tracking-cardiac-magnetic-resonance-imaging-in-st-segment-elevation-myocardial-infarction
#1
Yeonyee E Yoon, Si-Hyuck Kang, Hong-Mi Choi, Seonji Jeong, Ji Min Sung, Sang-Eun Lee, Injeong Cho, Goo-Yeong Cho, Hyuk-Jae Chang, Eun Ju Chun
OBJECTIVES: We investigated whether quantification of global left ventricular (LV) strain by tissue tracking-CMR (TT-CMR) can estimate the infarct size and clinical outcomes in patients with acute myocardial infarction (MI). METHODS: We retrospectively registered 247 consecutive patients (58 ± 12 years; male, 81%) who underwent 1.5-T CMR within 1 month after ST-segment elevation MI (median, 4 days; interquartile range, 3-6 days), and 20 age- and sex-matched controls (58 ± 11 years; male, 80%)...
February 15, 2018: European Radiology
https://www.readbyqxmd.com/read/29449957/early-detection-of-myocardial-dysfunction-using-two-dimensional-speckle-tracking-echocardiography-in-a-young-cat-with-hypertrophic-cardiomyopathy
#2
Ryohei Suzuki, Yohei Mochizuki, Hiroki Yoshimatsu, Ayaka Niina, Takahiro Teshima, Hirotaka Matsumoto, Hidekazu Koyama
Case summary: A 5-month-old intact female Scottish Fold cat was presented for cardiac evaluation. Careful auscultation detected a slight systolic murmur (Levine I/VI). The findings of electrocardiography, thoracic radiography, non-invasive blood pressure measurements and conventional echocardiographic studies were unremarkable. However, two-dimensional speckle tracking echocardiography revealed abnormalities in myocardial deformations, including decreased early-to-late diastolic strain rate ratios in longitudinal, radial and circumferential directions, and deteriorated segmental systolic longitudinal strain...
January 2018: JFMS Open Reports
https://www.readbyqxmd.com/read/29448756/ductile-crack-initiation-criterion-with-mismatched-weld-joints-under-dynamic-loading-conditions
#3
Gyubaek An, Se-Min Jeong, Jeongung Park
Brittle failure of high toughness steel structures tends to occur after ductile crack initiation/propagation. Damages to steel structures were reported in the Hanshin Great Earthquake. Several brittle failures were observed in beam-to-column connection zones with geometrical discontinuity. It is widely known that triaxial stresses accelerate the ductile fracture of steels. The study examined the effects of geometrical heterogeneity and strength mismatches (both of which elevate plastic constraints due to heterogeneous plastic straining) and loading rate on critical conditions initiating ductile fracture...
March 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29432196/layer-specific-strain-in-hypertensive-patients-with-and-without-mild-diastolic-dysfunction
#4
Hisham Sharif, Stephen Ting, Lynsey Forsythe, Gordon McGregor, Prithwish Banerjee, Deborah O'Leary, Davis Ditor, Keith George, Daniel Zehnder, Davis Oxborough
This study sought to examine layer-specific longitudinal and circumferential systolic and diastolic strain, strain rate (SR) and diastolic time intervals in hypertensive patients with and without diastolic dysfunction. Fifty-eight treated hypertensive patients were assigned to normal diastolic function (NDF, N=39) or mild diastolic dysfunction (DD, N=19) group. Layer-specific systolic and diastolic longitudinal and circumferential strains and SR were assessed. Results showed no between group difference in left ventricular mass index (DD: 92...
February 5, 2018: Echo Research and Practice
https://www.readbyqxmd.com/read/29430691/left-ventricular-function-of-patients-with-pregnancy-induced-hypertension-evaluated-using-velocity-vector-imaging-echocardiography-and-n-terminal-pro-brain-natriuretic-peptide
#5
Li Yu, Qichang Zhou, Qinghai Peng, Zurong Yang
PURPOSE: To investigate whether acute and transient pressure overload in patients with pregnancy-induced hypertension (PIH) affects left ventricular (LV) systolic function. METHODS: From pregnancy to 3 months after delivery, 82 patients were analyzed: 27, 25, and 30 with gestational hypertension, preeclampsia, and the healthy control group, respectively. Conventional echocardiography and velocity vector imaging (VVI) were performed, and blood levels of N-terminal pro-brain natriuretic peptide (NT-pro-BNP) were analyzed...
February 11, 2018: Echocardiography
https://www.readbyqxmd.com/read/29410989/pneumatically-actuated-cell-stretching-array-platform-for-engineering-cell-patterns-in-vitro
#6
Harshad Kamble, Raja Vadivelu, Matthew Barton, Muhammad J A Shiddiky, Nam-Trung Nguyen
Cellular response to mechanical stimuli is a well-known phenomenon known as mechanotransduction. It is widely accepted that mechanotransduction plays an important role in cell alignment which is critical for cell homeostasis. Although many approaches have been developed in recent years to study the effect of external mechanical stimuli on cell behaviour, most of them have not explored the ability of mechanical stimuli to engineer cell alignment to obtain patterned cell cultures. This paper introduces a simple, yet effective pneumatically actuated 4 × 2 cell stretching array for concurrently inducing a range of cyclic normal strains onto cell cultures to achieve predefined cell alignment...
February 7, 2018: Lab on a Chip
https://www.readbyqxmd.com/read/29408823/torsion-mechanics-as-an-indicator-of-more-advanced-left-ventricular-systolic-dysfunction-in-secondary-mitral-regurgitation-in-patients-with-dilated-cardiomyopathy-a-2d-speckle-tracking-analysis
#7
Elena Kinova, Natalia Spasova, Angelina Borizanova, Assen Goudev
Left ventricular (LV) twist serves as a compensatory mechanism in systolic dysfunction and its degree of reduction may reflect a more advanced stage of disease. AIM: The aim was to investigate twist alterations depending on the degree of functional mitral regurgitation (MR) by speckle-tracking echocardiography. METHODS: Sixty-three patients with symptomatic dilated cardiomyopathy (DCM) were included. Patients were divided according to MR vena contracta width (VCW): group 1 with VCW <7 mm (mild/moderate MR) and group 2 with VCW ≥7 mm (severe MR)...
February 6, 2018: Cardiology
https://www.readbyqxmd.com/read/29402736/automated-three-dimensional-tracking-of-the-left-ventricular-myocardium-in-time-resolved-and-dose-modulated-cardiac-ct-images-using-deformable-image-registration
#8
Vikas Gupta, Jonas Lantz, Lilian Henriksson, Jan Engvall, Matts Karlsson, Anders Persson, Tino Ebbers
BACKGROUND: Assessment of myocardial deformation from time-resolved cardiac computed tomography (4D CT) would augment the already available functional information from such an examination without incurring any additional costs. A deformable image registration (DIR) based approach is proposed to allow fast and automatic myocardial tracking in clinical 4D CT images. METHODS: Left ventricular myocardial tissue displacement through a cardiac cycle was tracked using a B-spline transformation based DIR...
February 2, 2018: Journal of Cardiovascular Computed Tomography
https://www.readbyqxmd.com/read/29402525/atrio-ventricular-deformation-and-heart-failure-in-ebstein-s-anomaly-a-cardiovascular-magnetic-resonance-study
#9
Michael Steinmetz, Marike Broder, Olga Hösch, Pablo Lamata, Shelby Kutty, Johannes T Kowallick, Wieland Staab, Christian Oliver Ritter, Gerd Hasenfuß, Thomas Paul, Joachim Lotz, Andreas Schuster
PURPOSE: We aimed to quantify atrial and ventricular myocardial deformation in Ebstein's Anomaly (EA) in a case-control study with cardiovascular magnetic resonance (CMR) feature tracking and to correlate changes in cardiac performance with the severity of disease and clinical heart failure parameters. MATERIALS AND METHODS: Atrial and ventricular deformation was measured using CMR feature tracking in 30 EA and 20 healthy control subjects. Atrial performance was characterized using longitudinal strain and strain rate parameters for reservoir function, conduit function and booster pump function...
February 2, 2018: International Journal of Cardiology
https://www.readbyqxmd.com/read/29399870/assessment-of-myocardial-strain-in-children-with-risk-factors-for-atherosclerosis-with-use-of-3d-speckle-tracking-echocardiography
#10
Peixu Zhang, Dongqing Li, Yanzhuo Su, Xiaona Wang, Jianping Sun, Yang Xu, Jinghui Sun
BACKGROUND: The known risk factors for atherosclerosis such as dyslipidemia, hypertension, obesity, and fasting hyperglycemia are associated with subclinical myocardial dysfunction. We assessed myocardial strain in children who had risk factors for atherosclerosis with use of 3D speckle tracking echocardiography (3DSTE). METHODS: A total of 340 eligible children (mean age [±SD]: 9.5 [±1.9] years; range, 7.1-12.2; 189 males, 151 females). Levels of serum cholesterol (TC), triglyceride (TG), high-density lipoprotein cholesterol (HDL-C), low-density lipoprotein cholesterol (LDL-C), fasting blood glucose (FBG), systolic blood pressure (SBP), diastolic blood pressure (DBP), and body mass index (BMI) were investigated...
February 4, 2018: Echocardiography
https://www.readbyqxmd.com/read/29395940/two-dimensional-speckle-tracking-echocardiography-in-calves-feasibility-and-repeatability-study
#11
L Lecoq, N Moula, H Amory, F Rollin, A Leroux
OBJECTIVES: To assess the feasibility and repeatability of two-dimensional speckle tracking echocardiography for the evaluation of left ventricular function in healthy calves. ANIMALS: 12 Holstein calves, 62 ± 11.6 days old; 75.25 ± 5.4 Kg. METHODS: Observational study. Right parasternal short-axis views at papillary muscle level were recorded in standing calves and subsequently analyzed by two-dimensional speckle tracking for global and regional radial and circumferential strains and strain rates and radial displacement...
January 29, 2018: Journal of Veterinary Cardiology: the Official Journal of the European Society of Veterinary Cardiology
https://www.readbyqxmd.com/read/29395702/left-ventricular-strain-in-chemotherapy-naive-and-radiotherapy-naive-patients-with-cancer
#12
Marijana Tadic, Martin Genger, Ana Baudisch, Sebastian Kelle, Cesare Cuspidi, Evgeny Belyavskiy, Franziska Burkhardt, Lucia Venneri, Philipp Attanasio, Burkert Pieske
BACKGROUND: We sought to investigate left ventricular (LV) function and mechanics in patients with cancer before they received chemotherapy or radiotherapy, as well as the relationship between cancer and reduced LV multidirectional strain in the whole study population. METHODS: The retrospective study involved 122 chemotherapy- and radiotherapy-naive patients with cancer and 45 age- and sex-matched controls with a cardiovascular risk profile similar to that of the patients with cancer...
November 29, 2017: Canadian Journal of Cardiology
https://www.readbyqxmd.com/read/29391146/ischemic-mitral-regurgitation-abnormal-strain-overestimates-non-viable-myocardium
#13
Ashley E Morgan, Yue Zhang, Mehrzad Tartibi, Samantha Goldburg, Jiwon J Kim, Thanh D Nguyen, Julius Guccione, Liang Ge, Jonathan W Weinsaft, Mark B Ratcliffe
BACKGROUND: Therapy for moderate ischemic mitral regurgitation (IMR) remains unclear. Determination of myocardial viability, a necessary pre-requisite for an improvement in regional contractility, is a likely key factor in determining response to revascularization alone. Myocardial strain has been proposed as a viability measure but has not been compared to late gadolinium enhancement (LGE) cardiac (c)MRI. We hypothesized that abnormal strain overestimates non-viable LV segments measured using LGE and that ischemia and mechanical tethering by adjacent transmural myocardial infarction (TMI) also decreases strain in viable segments...
January 29, 2018: Annals of Thoracic Surgery
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
#14
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/29378516/left-ventricular-short-axis-systolic-function-changes-in-patients-with-hypertrophic-cardiomyopathy-detected-by-two-dimensional-speckle-tracking-imaging
#15
Jun Huang, Zi-Ning Yan, Yi-Fei Rui, Li Fan, Chang Liu, Jie Li
BACKGROUND: Hypertrophic cardiomyopathy (HCM) is a genetic disease was characterised by left ventricular hypertrophy (LVH), myocardial fibrosis, fiber disarray. The short-axis systolic function is important in left ventricle function. METHODS: Forty one healthy subjects and 37 HCM patients were enrolled for this research. Parasternal short-axis at the basal, middle, and apical levels were acquired by Echocardiography. The peak systolic circumferential strain of the endocardial, the middle and the epicardial layers, the peak systolic radial strain, and the peak systolic rotational degrees at different short-axis levels were measured by 2-dimensional speckle tracking imaging (2D-STI)...
January 30, 2018: BMC Cardiovascular Disorders
https://www.readbyqxmd.com/read/29369795/cardiovascular-magnetic-resonance-characterization-of-myocardial-and-vascular-function-in-rheumatoid-arthritis-patients
#16
Ntobeko A B Ntusi, Jane M Francis, Freedom Gumedze, Paul M Matthews, Paul B Wordsworth, Stefan Neubauer, Theodoros D Karamitsos
BACKGROUND: Rheumatoid arthritis (RA) is a multi-system, autoimmune disorder and confers one of the strongest risks for cardiovascular disease (CVD) morbidity and mortality. OBJECTIVE: To assess myocardial function and vascular stiffness in RA patients with and without cardiovascular risk factors (CVRFs) using cardiovascular magnetic resonance (CMR). METHODS: 23 RA patients with no CVRFs (17 female, mean age 52±13 years), 46 RA patients with CVRFs (32 female, mean age 53± 12), 50 normal controls (32 female, mean age 50±11 years), and 13 controls with CVRFs (7 female, mean age 55±7 years), underwent CMR at 1...
January 21, 2018: Hellenic Journal of Cardiology: HJC, Hellēnikē Kardiologikē Epitheōrēsē
https://www.readbyqxmd.com/read/29363154/nonalcoholic-fatty-liver-is-associated-with-further-left-ventricular-abnormalities-in-patients-with-type-2-diabetes-mellitus-a-3-dimensional-speckle-tracking-study
#17
Qingqing Wang, Wenyan Ma, Jizhu Xia
OBJECTIVES: The aim of this study was to detect left ventricular (LV) structure and function abnormalities in patients with type 2 diabetes mellitus with or without nonalcoholic fatty liver (NAFL) using 3-dimensional speckle-tracking echocardiography. METHODS: Eighty patients with type 2 diabetes and a normal LV ejection fraction (≥55%), including 40 with coexistent NAFL, and 40 age- and sex-matched control participants were recruited. Conventional echocardiography and 3-dimensional speckle-tracking echocardiography were performed, and global longitudinal strain, global circumferential strain, global area strain, and global radial strain values were measured...
January 24, 2018: Journal of Ultrasound in Medicine: Official Journal of the American Institute of Ultrasound in Medicine
https://www.readbyqxmd.com/read/29359809/use-of-two-dimensional-speckle-tracking-echocardiography-to-predict-cardiac-events-comparison-of-patients-with-acute-myocardial-infarction-and-chronic-coronary-artery-disease
#18
Jörg Scharrenbroich, Sandra Hamada, Andras Keszei, Jörg Schröder, Andreas Napp, Mohammad Almalla, Michael Becker, Ertunc Altiok
BACKGROUND: Two-dimensional speckle strain (2D STE) echocardiography can aid in the prognosis of acute myocardial infarction (AMI) and chronic coronary artery disease (CAD). HYPOTHESIS: Differences occur in the prediction of cardiac events using 2D STE in AMI vs CAD patients. METHODS: In this prospective study, 94 patients with a first AMI and successful revascularization, and 137 patients with stable CAD after complete revascularization were included...
January 23, 2018: Clinical Cardiology
https://www.readbyqxmd.com/read/29349824/reduced-left-ventricular-filling-following-blood-volume-extraction-does-not-result-in-compensatory-augmentation-of-cardiac-mechanics
#19
Rachel Lord, David MacLeod, Keith George, David Oxborough, Rob Shave, Mike Stembridge
An acute non-invasive reduction in preload has been shown to augment cardiac mechanics to maintain stroke volume and cardiac output. Such interventions induce concomitant changes in heart rate (HR), whereas blood volume extraction reduces preload without HR changes. Therefore, the purpose of this study was to determine whether a preload reduction in isolation resulted in augmented stroke volume achieved via enhanced cardiac mechanics. Nine healthy volunteers (4 female, age 29 ± 11 years) underwent echocardiography for the assessment of left ventricular (LV) volumes and mechanics in a supine position at baseline and end-extraction following the controlled removal of 25% of total blood volume (1062 ± 342 ml)...
January 18, 2018: Experimental Physiology
https://www.readbyqxmd.com/read/29339701/subclinical-reduction-in-left-ventricular-function-using-triplane-and-2d-speckle-tracking-echocardiography-after-anthracycline-exposure-in-children
#20
Erman Çilsal, Ayşe Deniz Oğuz, Fatma Sedef Tunaoğlu, Serdar Kula, Ayhan Pektaş
OBJECTIVE: Speckle tracking echocardiography (STE) enables global and regional evaluation of the left ventricle (LV); therefore, it is the most useful method for detecting subclinical dysfunction in patients exposed to cardiotoxic agents. A novel technique triplane (3P) echocardiography also allows single beat assessment of LV global longitudinal strain values. We firstly aimed to demonstrate both two-dimensional (2D)- and 3PSTE-derived LV global longitudinal strain measurements in children after anthracycline exposure...
January 2018: Anatolian Journal of Cardiology
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