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longitudinal strain

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https://www.readbyqxmd.com/read/28427572/a-search-for-mixotrophy-and-mucus-trap-production-in-alexandrium-spp-and-the-dynamics-of-mucus-trap-formation-in-alexandrium-pseudogonyaulax
#1
Hannah E Blossom, Tine Dencker Bædkel, Urban Tillmann, Per Juel Hansen
Recently, a hitherto unknown feeding strategy, the toxic mucus trap, was discovered in the dinoflagellate Alexandrium pseudogonyaulax. In this study, over 40 strains of 8 different Alexandrium species (A. ostenfeldii, A. tamarense, A. catenella, A. taylorii, A. margalefii, A. hiranoi, A. insuetum and A. pseudogonyaulax) were screened for their ability to ingest prey and/or to form mucus traps. The mucus trap feeding strategy, where a mucus trap is towed by the longitudinal flagellum remains unique to A. pseudogonyaulax...
April 2017: Harmful Algae
https://www.readbyqxmd.com/read/28426887/frontiers-in-heart-failure-sodium-longitudinal-strain-contractility-sensor-fatal-arrhythmias-and-stroke
#2
Thomas F Lüscher
No abstract text is available yet for this article.
March 7, 2017: European Heart Journal
https://www.readbyqxmd.com/read/28426885/prognostic-implications-of-left-ventricular-global-longitudinal-strain-in-heart-failure-patients-with-narrow-qrs-complex-treated-with-cardiac-resynchronization-therapy-a-subanalysis-of-the-randomized-echocrt-trial
#3
Jeroen J Bax, Victoria Delgado, Peter Sogaard, Jagmeet P Singh, William T Abraham, Jeffrey S Borer, Kenneth Dickstein, Daniel Gras, Josep Brugada, Michele Robertson, Ian Ford, Henry Krum, Johannes Holzmeister, Frank Ruschitzka, John Gorcsan
Aim: Left ventricular (LV) global longitudinal strain (GLS) reflects LV systolic function and correlates inversely with the extent of LV myocardial scar and fibrosis. The present subanalysis of the Echocardiography Guided CRT trial investigated the prognostic value of LV GLS in patients with narrow QRS complex. Methods and results: Left ventricular (LV) global longitudinal strain (GLS) was measured on the apical 2-, 4- and 3-chamber views using speckle tracking analysis...
March 7, 2017: European Heart Journal
https://www.readbyqxmd.com/read/28425561/creating-homogenous-strain-distribution-within-3d-cell-encapsulated-constructs-using-a-simple-and-cost-effective-uniaxial-tensile-bioreactor-design-and-validation-study
#4
Gayathri Subramanian, Mostafa Elsaadany, Callan Bialorucki, Eda Yildirim-Ayan
Mechanical loading bioreactors capable of applying uniaxial tensile strains are emerging to be a valuable tool to investigate physiologically-relevant cellular signaling pathways and biochemical expression. In this study, we have introduced a simple and cost-effective uniaxial tensile strain bioreactor for the application of precise and homogenous uniaxial strains to 3D cell-encapsulated collagen constructs at physiological loading strains (0-12%) and frequencies (0.01-1 Hz). The bioreactor employs silicone-based loading chambers specifically designed to stretch constructs without direct gripping to minimize stress concentration at the ends of the construct and preserve its integrity...
April 20, 2017: Biotechnology and Bioengineering
https://www.readbyqxmd.com/read/28425164/the-fallacy-of-resting-echocardiographic-parameters-of-cardiac-function-in-heart-failure-with-preserved-ejection-fraction-add-global-longitudinal-strain-to-the-list
#5
EDITORIAL
Dragoş Vinereanu, Andrei D Mǎrgulescu
No abstract text is available yet for this article.
April 19, 2017: European Journal of Heart Failure
https://www.readbyqxmd.com/read/28424890/left-atrial-electromechanical-conduction-time-predicts-atrial-fibrillation-in-patients-with-mitral-stenosis-a-5-year-follow-up-speckle-tracking-echocardiography-study
#6
Ozkan Candan, Cetin Gecmen, Arzu Kalayci, Cem Dogan, Emrah Bayam, Mehmet Ozkan
Prolonged left atrial electromechanical conduction time is related with atrial electrical remodeling, and is predictive of the development of atrial fibrillation. The aim of our study was to examine whether left atrial electromechanical conduction time (EMT) and left atrial strain as measured by speckle tracking echocardiography (STE) are predictors for the development of atrial fibrillation (AF) in patients with mitral stenosis (MS) at 5-year follow-up. A total of 81 patients (61% females; mean age 38.1 ± 12...
April 19, 2017: International Journal of Cardiovascular Imaging
https://www.readbyqxmd.com/read/28423986/global-longitudinal-strain-from-resting-echocardiogram-is-associated-with-long-term-adverse-cardiac-outcomes-in-patients-with-suspected-coronary-artery-disease
#7
Ajay Yadlapati, Timothy R Maher, James D Thomas, Mark Gajjar, Kofo O Ogunyankin, Jyothy J Puthumana
PURPOSE: Measuring myocardial strain using two-dimensional speckle tracking echocardiography has emerged as a new tool to identify subclinical ventricular dysfunction. Abnormal strain has been shown to have superior sensitivity compared with dobutamine stress echocardiography for viability assessment; however, there is a paucity of data regarding the prediction of long-term major adverse cardiac events. We compared the prognostic ability of both global longitudinal strain (GLS) from resting echocardiograms to regional wall motion score index (WMSI) from stress echocardiograms in their ability to predict long-term major adverse cardiac events...
March 1, 2017: Perfusion
https://www.readbyqxmd.com/read/28421305/the-utility-of-global-longitudinal-strain-in-the-identification-of-prior-myocardial-infarction-in-patients-with-preserved-left-ventricular-ejection-fraction
#8
Graham J Fent, Pankaj Garg, James R J Foley, Laura E Dobson, Tarique A Musa, Bara Erhayiem, John P Greenwood, Sven Plein, Peter P Swoboda
Prior myocardial infarction (MI) is associated with increased mortality and is prevalent in certain high risk patient groups. Electrocardiogram may be used in diagnosis, however, sensitivity is limited, thus non-invasive imaging techniques may improve diagnosis. We investigated whether global longitudinal strain (GLS) and longitudinal strain parameters are reduced in patients with prior MI but preserved left ventricular ejection fraction (LVEF). The study included 40 clinical patients with prior MI occurring >3 months previously (defined as subendocardial hyperenhancement on late Gadolinium enhancement imaging) with LVEF ≥ 55% and 40 controls matched for age and LVEF...
April 18, 2017: International Journal of Cardiovascular Imaging
https://www.readbyqxmd.com/read/28419023/interrelations-of-epicardial-fat-volume-left-ventricular-t1-relaxation-times-and-myocardial-strain-in-hypertensive-patients-a-cardiac-magnetic-resonance-study
#9
Rami Homsi, Daniel Kuetting, Alois Sprinkart, Nina Steinfeld, Michael Meier-Schroers, Julian Luetkens, Jennifer Nadal, Darius Dabir, Stefan Fischer, Juergen Gieseke, Hans Schild, Daniel Thomas
PURPOSE: This cardiac magnetic resonance study was performed to assess myocardial fibrosis by evaluating T1-relaxation time (T1), to measure left ventricular (LV) strain, and to determine epicardial fat volume (EFV) in hypertensive patients with no history of cardiovascular (CV) events and to relate the results to the presence of coronary atherosclerotic artery disease (CAD) in these patients. MATERIALS AND METHODS: A total of 123 subjects were examined at 1.5 T...
May 2017: Journal of Thoracic Imaging
https://www.readbyqxmd.com/read/28415129/p1294evaluation-of-right-atrium-mechanics-and-relation-with-loading-conditions-by-speckle-tracking-echocardiography
#10
S Unlu
Purpose: The aim of this study is to evaluate the right atrial (RA) mechanics and change in echocardiographic parameters used for assessment of RA by examining the end stage kidney patients before and after the hemodialysis (HD). Methods: Patients between 18 and 85 years of age, receiving HD for at least 6 months were included. The echocardiographic images were obtained before and after hemodialysis therapy. Two-dimensional speckle tracking strain analysis was performed for right atrium in 62 patients...
December 1, 2016: European Heart Journal Cardiovascular Imaging
https://www.readbyqxmd.com/read/28415128/p1270effects-of-blood-pressure-variability-on-layer-specific-longitudinal-strain-in-hypertension
#11
W-C Tsai, W-H Lee, Y-W Liu
Background: Our previous study showed sub-epicardial longitudinal strain (EpiLS) was an independent prognostic factor for worse outcome in regular treated hypertension but not global longitudinal strain (GLS) and sub-endocardial longitudinal strain (EndLS). Increased blood pressure variability (BPV) has been found associated with target organ damage in hypertension. However, effects of BPV on layer-specific longitudinal strain have not been well studied. Purpose: The aim of this study was to investigate the effects of different blood pressure parameters on layer-specific longitudinal strain in hypertension...
December 1, 2016: European Heart Journal Cardiovascular Imaging
https://www.readbyqxmd.com/read/28415104/p697new-indices-for-a-best-quantification-of-left-ventricular-function-in-heart-valve-diseases
#12
A Hubert, E Galli, G Bouzille, E Samset, E Donal
Aims. The Assessment of left ventricular (LV) function remains a clinical challenge especially in patients with preserved LV ejection fraction (EF) and valvular heart diseases (VHD). Mechanical dispersion is supposed to be a strong predictor of events and, to be related to the extent of fibrosis. Regional cardiac work is a new validated and very promising approach to quantify LV-function. We investigated the differences in mechanical dispersions and global LV work (totW) and wasted work fraction (WWF) in normal subjects and in patients with severe primary mitral regurgitation (MR) and severe aortic stenosis (AS)...
December 1, 2016: European Heart Journal Cardiovascular Imaging
https://www.readbyqxmd.com/read/28415103/p673improvement-of-arterial-stiffness-and-myocardial-deformation-in-patients-with-poorly-controlled-diabetes-mellitus-type-2-after-optimization-of-antidiabetic-medication
#13
I Ikonomidis, G Pavlidis, V Lambadiari, F Kousathana, H Triantafyllidi, M Varoudi, D Vlastos, S Vlachos, G Dimitriadis, J Lekakis
Background: Arterial stiffness is associated with increased risk for cardiovascular disease. The purpose of this study is to investigate the arterial stiffness and myocardial deformation in patients with poorly controlled diabetes mellitus type 2 before and after glycemic control by optimal medication. Methods: In 50 patients with uncontrolled type 2 diabetes(age:52±10years)and 25 controls of similar age and sex and no atherosclerotic risk factors we measured at baseline and 6 months after glycemic control a) carotid-femoral pulse wave velocity(PWVc m/sec-Complior SP ALAM),central systolic blood pressure(cSBP -mmHg),augmentation index(AI%), of the aortic pulse wave(ArteriographTensioMed) b)S',E'(m/sec)andE'/A'of mitral annulus by Tissue Doppler c)LV longitudinal strain(GLS-%),systolic(LongSr-l/sec)and diastolic(LongSrE-l/sec)strain rate, twisting(Tw-deg),peak twisting(Tw)and untwisting(unTw-deg/sec)velocity using speckle tracking echocardiography...
December 1, 2016: European Heart Journal Cardiovascular Imaging
https://www.readbyqxmd.com/read/28415084/p260right-cardiac-chambers-remodeling-in-marathon-and-ultra-trail-athletes-detected-by-speckle-tracking-echocardiography
#14
K Ujka, R M Bruno, B Catuzzo, L Bastiani, A Tonacci, G D'angelo, S Mrakic-Sposta, A Vezzoli, G Giardini, L Pratali
Background: Strenuous and chronic exercise training can have detrimental effects on cardiac morphology and function. Our aim was to evaluate the cardiac adaptation between 2 different specialties' endurance athletes: marathon runners (M) and ultra-trailers (UT). Methods: 47 M (age 45±7, men 32; training: 18 (9-53) years*days/week), 41 UT (age 42±9, men 38, training: 30 (15-66) years*days/week) were submitted in rest condition to conventional 2D echocardiography and Speckle-Tracking echo (STE) (Beyond Diogenes 2...
December 1, 2016: European Heart Journal Cardiovascular Imaging
https://www.readbyqxmd.com/read/28415083/p235relation-between-myocardial-deformation-by-three-dimensional-speckle-tracking-analysis-control-of-the-hypertension-and-functional-capacity-in-patients-with-systemic-hypertension
#15
I Craciunescu, G Badea, G Ursu, S Vasile, M Iancu, M Bolog, M Dumitrescu
The purpose of this study was to investigate left ventricular (LV) function in hypertensive patients by 3-dimensional (3D) speckle tracking imaging, and determine the relation between the LV mechanics and functional capacity in this population. This cross-sectional study included 20 treated subjects with well-controlled arterial hypertension (group B) and 20 treated participants with uncontrolled hypertension (group A), adjusted by gender and age. All the subjects underwent 24-hour blood pressure monitoring, complete 2-dimensional and 3D examination, and exercise testing...
December 1, 2016: European Heart Journal Cardiovascular Imaging
https://www.readbyqxmd.com/read/28409231/preoperative-right-ventricular-dysfunction-is-a-strong-predictor-of-3%C3%A2-years-survival-after-cardiac-surgery
#16
Jérôme Peyrou, Christophe Chauvel, Atul Pathak, Marc Simon, Patrick Dehant, Eric Abergel
BACKGROUND: Prognostic value of right ventricular (RV) systolic function is well established in valvular disease, heart failure but has not been evaluated in patients undergoing cardiac surgery. OBJECTIVES: The aim of the present study was to evaluate the prognostic value of preoperative RV dysfunction extensively evaluated on the basis of a large set of echocardiographic parameters [S', RV fractional area change (RVFAC), right myocardial performance index (RMPI), isovolumic acceleration (IVA), RV dP/dt and basal longitudinal strain (BLS)] in a large population of unselected patient awaiting cardiac surgery...
April 13, 2017: Clinical Research in Cardiology: Official Journal of the German Cardiac Society
https://www.readbyqxmd.com/read/28407011/anthracyclines-induce-early-changes-in-left-ventricular-systolic-and-diastolic-function-a-single-centre-study
#17
Anita Boyd, Paul Stoodley, David Richards, Rina Hui, Paul Harnett, Kim Vo, Tom Marwick, Liza Thomas
AIMS: 2 dimensional (2D) strain analysis detects subclinical left ventricular (LV) systolic dysfunction. Our aim was to evaluate changes in LV systolic and diastolic function in breast cancer patients early after anthracycline chemotherapy, and to identify predisposing factors. METHODS AND RESULTS: 140 patients were assessed by detailed echocardiography before and within seven days post treatment. LV ejection fraction (LVEF), global longitudinal strain (GLS), strain rate and radial and circumferential strain were assessed...
2017: PloS One
https://www.readbyqxmd.com/read/28405943/myocardial-oxidative-stress-correlates-with-left-ventricular-dysfunction-on-strain-echocardiography-in-a-rodent-model-of-sepsis
#18
Bereketeab Haileselassie, Erik Su, Iraklis Pozios, Diego F Niño, Hongyun Liu, Dai-Yin Lu, Ioannis Ventoulis, William B Fulton, Chhinder P Sodhi, David Hackam, Brian O'Rourke, Theodore Abraham
BACKGROUND: Recognition of cardiomyopathy in sepsis can be challenging due to the limitations of conventional measures such as ejection fraction (EF) and fractional shortening (FS) in the context of variable preload and afterload conditions. This study correlates myocardial function using strain echocardiography (SE) with cardiomyocyte oxidative stress in a murine model of sepsis. METHODS: C57BL/6J mice were randomized into control (n = 10), sham (n = 25), and a cecal ligation and puncture (CLP) (n = 33) model of sepsis...
December 2017: Intensive Care Medicine Experimental
https://www.readbyqxmd.com/read/28400462/saline-induced-coronary-hyperemia-mechanisms-and-effects-on-left-ventricular-function
#19
Bernard De Bruyne, Julien Adjedj, Panagiotis Xaplanteris, Angela Ferrara, Yujing Mo, Martin Penicka, Vincent Floré, Mariano Pellicano, Gabor Toth, Emanuele Barbato, Dirk J Duncker, Nico H J Pijls
BACKGROUND: During thermodilution-based assessment of volumetric coronary blood flow, we observed that intracoronary infusion of saline increased coronary flow. This study aims to quantify the extent and unravel the mechanisms of saline-induced hyperemia. METHODS AND RESULTS: Thirty-three patients were studied; in 24 patients, intracoronary Doppler flow velocity measurements were performed at rest, after intracoronary adenosine, and during increasing infusion rates of saline at room temperature through a dedicated catheter with 4 lateral side holes...
April 2017: Circulation. Cardiovascular Interventions
https://www.readbyqxmd.com/read/28399703/value-of-speckle-tracking-echocardiography-for-detection-of-clinically-silent-left-ventricular-dysfunction-in-patients-with-%C3%AE-thalassemia
#20
Mozhgan Parsaee, Sedigheh Saedi, Pegah Joghataei, Azita Azarkeivan, Zahra Alizadeh Sani
OBJECTIVE: β-Thalassemia is an inherited hemoglobin disorder resulting in chronic hemolytic anemia requiring chronic transfusion therapy. Cardiac involvement is the main cause of death in patients with thalassemia major. The narrow border is between overt myocardial dysfunction and clinically silent left ventricular (LV) dysfunction in patients with thalassemia. Therefore, we need novel parameters in different imaging techniques to discover cardiac involvement in an early and subtle stage...
April 12, 2017: Hematology (Amsterdam, Netherlands)
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