نتایج جستجو برای: ecv

تعداد نتایج: 811  

2017
Frank J. Raucci David A. Parra Jason T. Christensen Lazaro E. Hernandez Larry W. Markham Meng Xu James C. Slaughter Jonathan H. Soslow

BACKGROUND Extracellular volume fraction (ECV) is altered in pathological cardiac remodeling and predicts death and arrhythmia. ECV can be quantified using cardiovascular magnetic resonance (CMR) T1 mapping but calculation requires a measured hematocrit (Hct). The longitudinal relaxation of blood has been used in adults to generate a synthetic Hct (estimate of true Hct) but has not been validat...

An experimental setup has been developed for successive photo-electrochemical etch and EIS measurement of semiconductor samples. Furthermore an algorithm based on electrochemical capacitance-voltage (ECV) has been developed for calculating dopant profile based on the measurements by developed setup. Phosphorous diffusion profile in p-type silicon was estimated by employing developed setup and a...

2017
Clotilde Roy Alisson Slimani Christophe de Meester Mihaela Amzulescu Agnès Pasquet David Vancraeynest Jean-Louis Vanoverschelde Anne-Catherine Pouleur Bernhard L. Gerber

BACKGROUND Myocardial T1, T2 and T2* imaging techniques become increasingly used in clinical practice. While normal values for T1, T2 and T2* times are well established for 1.5 Tesla (T) cardiovascular magnetic resonance (CMR), data for 3T remain scarce. Therefore we sought to determine normal reference values relative to gender and age and day to day reproducibility for native T1, T2, T2* mapp...

2011
EK Hutton ME Hannah SJ Ross M-F Delisle GD Carson R Windrim A Ohlsson AR Willan A Gafni G Sylvestre R Natale Y Barrett JK Pollard MS Dunn P Turtle

OBJECTIVE To investigate whether initiating external cephalic version (ECV) earlier in pregnancy might increase the rate of successful ECV procedures, and be more effective in decreasing the rate of non-cephalic presentation at birth and of caesarean section. DESIGN An unblinded multicentred randomised controlled trial. SETTING A total of 1543 women were randomised from 68 centres in 21 cou...

Journal: :JACC. Cardiovascular imaging 2015
Sujith Kuruvilla Rajesh Janardhanan Patrick Antkowiak Ellen C Keeley Nebiyu Adenaw Jeremy Brooks Frederick H Epstein Christopher M Kramer Michael Salerno

OBJECTIVES The goal of this study was to assess the relationship among extracellular volume (ECV), native T1, and systolic strain in hypertensive patients with left ventricular hypertrophy (HTN LVH), hypertensive patients without LVH (HTN non-LVH), and normotensive controls. BACKGROUND Diffuse myocardial fibrosis in HTN LVH patients, as reflected by increased ECV and native T1, may be an unde...

2013
Ulf K Radunski Gunnar Lund Mandana D Nariman Bernhard Schnackenburg Christian Stehning Gerhard Adam Stefan Blankenberg Kai Muellerleile

Methods T1 mapping was implemented into a standard CMR protocol in 113 patients with clinically suspected myocarditis at 1.5 Tesla. T1 quantification was performed for ECV -calculation using the modified Look-Locker inversionrecovery (MOLLI) sequence on three short-axes before and 15 minutes after administration of 0.075 mmol/kg gadolinium BOPTA, respectively. Global left ventricular ECV was ca...

2015
Thomas A Treibel Arthur Nasis Marianna Fontana Viviana Maestrini Silvia Castelletti Anish N Bhuva Stefania Rosmini Amna Abdel-Gadir Heerajnarain Bulluck Peter Kellman Stefan K Piechnik Matthew D Robson James Moon

Background The extracellular volume fraction (ECV) by T1 mapping measures the size of the myocardial interstitium. T1 changes in blood and myocardium are used to measure the contrast partition coefficient (l), and substituting in the blood volume of distribution (directly measured on a peripheral blood sample as one minus the hematocrit [Hct]) provides the ECV. This methodology is however cumbe...

2016
Jonathan M Levine Jeremy D Collins Gillian Murtagh Michael Markl James C Carr Lubna Choudhury

Background Late gadolinium enhancement (LGE) by cardiac magnetic resonance (CMR) is a common finding in patients with hypertrophic cardiomyopathy (HCM), and its extent correlates with clinical parameters such as ventricular tachycardia and sudden cardiac death. While LGE has been shown to reflect focal replacement fibrosis, recently optimized T1 mapping techniques have allowed for the quantific...

2014
Sujith Kuruvilla Rajesh Janardhanan Yang Yang Yasmin S Hamirani Frederick H Epstein Ellen C Keeley Christopher M Kramer Michael Salerno

Background Study purpose To detect differences in extracellular volume (ECV) and systolic strain in hypertensive patients with LVH as compared to hypertensive patients without LVH and age-matched controls. Background: Increased ECV due to diffuse myocardial fibrosis in hypertensive patients may be an underlying mechanism contributing to increased cardiovascular risk. Moreover HTN patients with ...

2015
Adam K McDiarmid David M Higgins David A Broadbent David P Ripley Peter P Swoboda Ananth Kidambi Bara Erhayiem Tarique A Musa Laura E Dobson Pankaj Garg John P Greenwood Sven Plein

Background Diffuse myocardial fibrosis may be quantified with cardiovascular magnetic resonance (CMR) by calculating extra-cellular volume (ECV) from native and post-contrast T1 values. Previous studies have used either infusion or single bolus contrast administration. In clinical practice however split dose contrast injection is used as part of a stress/rest protocol in stress perfusion studie...

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