PURPOSE: To compare cardiac cine MR imaging using steady state free precession (SSFP) and fast low angle shot (FLASH) techniques at 1.5 and 3 T, and to establish their variabilities and reproducibilities for cardiac volume and mass determination in volunteers. To assess the feasibility of SSFP imaging in patients at 3 T and to determine comparability to volume data acquired at 1.5 T. MATERIALS AND METHODS: Ten healthy volunteers underwent cardiac magnetic resonance imaging using SSFP and segmented gradient-echo FLASH, using both a 1.5 and a 3 T MR system on the same day. Ten patients with impaired left ventricular (LV) function were also studied at both field strengths with SSFP. RESULTS: For both SSFP and FLASH, field strength had no effect on the quantification of LV and right ventricular (RV) volumes, mass, or function (P | or = 0.05 for field strength for all parameters). At both 1.5 and 3 T, SSFP yielded smaller LV mass (e.g., at 3 T 109 +/- 30 g vs. 142 +/- 37 g; P = 0.011) and larger LV volume (e
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The 1.2 release of the ACUSON SC2000 volume imaging ultrasound system delivers nonstitched, real-time, full-volume imaging of the heart in one heart cycle. The system allows automatic extraction of reference planes from continuous cardiac volume imaging for measurement, analysis, and interpretation. New to the ACUSON SC2000 system is the IN Focus coherent imaging technology. Without the need to continuously set and select a given location of best focus, IN Focus technology sharpens the full-field image at all times without sacrificing frame rate. Siemens offer knowledge-based workflow applications, which are designed to automate measurements for rapid, accurate and reproducible results. syngo Velocity Vector Imaging (VVI) technology instantaneously measures motion at any point in the cardiac cycle. syngo Auto Left Heart (Auto LH) technology automatically generates left atrial and left ventricular volumes and ejection fractions rapidly and reliably. syngo Arterial Health Package (AHP) provides ...
Total deaths from heart disease, stroke, diabetes and hypertension - known collectively as cardiometabolic disease, the leading cause of preventable death worldwide - have been increasing since 2011.
Anatomic validation of a novel method for left ventricular volume and mass measurements with use of real-time 3-dimensional echocardiography.
The paper describes an experimental activity on the spatial and temporal liquid- and vapor-phase distributions of diesel fuel at engine-like conditions. The influence of the k-factor (0 and 1.5) of a single-hole axial-disposed injector (0.100 mm diameter and 10 L/d ratio) has been studied by spraying fuel in an optically-accessible constant-volume combustion vessel. A high-speed imaging system, capable of acquiring Mie-scattering and Schlieren images in a near simultaneous fashion mode along the same line of sight, has been developed at the Michigan Technological University using a high-speed camera and a pulsed-wave LED system. The time resolved pair of schlieren and Mie-scattering images identifies the instantaneous position of both the vapor and liquid phases of the fuel spray, respectively. The studies have been performed at three injection pressures (70, 120 and 180 MPa), 23.9 kg/m3 ambient gas density and 900 K gas temperature in the vessel ...
The paper describes an experimental activity on the spatial and temporal liquid- and vapor-phase distributions of diesel fuel at engine-like conditions. The influence of the k-factor (0 and 1.5) of a single-hole axial-disposed injector (0.100 mm diameter and 10 L/d ratio) has been studied by spraying fuel in an optically-accessible constant-volume combustion vessel. A high-speed imaging system, capable of acquiring Mie-scattering and Schlieren images in a near simultaneous fashion mode along the same line of sight, has been developed at the Michigan Technological University using a high-speed camera and a pulsed-wave LED system. The time resolved pair of schlieren and Mie-scattering images identifies the instantaneous position of both the vapor and liquid phases of the fuel spray, respectively. The studies have been performed at three injection pressures (70, 120 and 180 MPa), 23.9 kg/m3 ambient gas density and 900 K gas temperature in the vessel ...
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Left heart volumes were determined angiographically in 50 subjects of whom 18 had no abnormality of the left heart, 12 had lesions causing pressure overload of the left ventricle, and 20 had lesions causing volume overload of the left ventricle. The left heart volumes were in the normal range in the presence of pressure overload, but, with volume overload, end-diastolic, end-systolic, and atrial volumes were in excess of normal. A linear relationship was demonstrated between end-diastolic and end-systolic volumes, regardless of the pressure load on the ventricle. Thus, for all but one of the cases studied, total left ventricular ejection volume formed a nearly constant proportion of end-diastolic volume.. ...
Measurement of acute serial changes in left ventricular volume is often desirable. Although left ventricular volumes estimated echocardiographically correlate well with results of angiographic methods, the sensitivity with which echocardiography can detect acute alterations in volume is unknown. Accordingly, the effect on transverse left ventricular dimension of interventions known to alter left ventricular volume (tilting and administration of nitroglycerin and phenylephrine) was studied in six normal subjects. Tilting significantly reduced end-diastolic dimension (from 48 ± 1.7 to 41.8 ± 1.5 mm, P , .01) and end-systolic dimension (from 32.2 ± 0.6 to 27.5 ± 0.8 mm, P , .001). Nitroglycerin also reduced end-diastolic dimension (from 44.8 ± 2.3 to 39.8 ± 2.1 mm, P , .02) and end-systolic dimension (from 30.2 ± 1.3 to 26.5 ± 1.2, P , .005). In contrast, phenylephrine increased end-diastolic dimension (from 42.3 ± 2.6 to 45.6 ± 2.6 mm, P , .025) but did not significantly alter ...
Semantic Scholar extracted view of Abstract 260: Quantitative Evaluation of Right Ventricular Volume and Its Ejection Fraction by 320 Slice Computed Tomography Compared With Three Dimensional Echocardiogram by Maiko Takahashi et al.
Total deaths from heart disease, stroke, diabetes and hypertension-known collectively as cardiometabolic disease-have been increasing since 2011, a new Northwestern Medicine study shows. Cardiometabolic disease is the ...
Sieslack AK, Dziallas P, Nolte I, et al. BMC Vet Res 2014;10:242. BackgroundRight ventricular (RV) volume and function are important diagnostic and prognostic
Experimental characterization of the burning behavior of gaseous mixtures has been carried out, analyzing spherical expanding flames. Tests were performed in the Device for Hydrogen-Air Reaction Mode Analysis (DHARMA) laboratory of Istituto Motori-CNR. Based on a high-pressure, constant-volume bomb, the activity is aimed at populating a systematic database on the burning properties of CH4, H2 and other species of interest, in conditions typical of internal combustion (i.c.) engines and gas turbines. High-speed shadowgraph is used to record the flame growth, allowing to infer the laminar burning parameters and the flame stability properties. Mixtures of CH4, H2 and air have been analyzed at initial temperature 293÷305 K, initial pressure 3÷18 bar and equivalence ratio = 1.0. The amount of H2 in the mixture was 0%, 20% and 30% (vol.). The effect of the initial pressure and of the Hydrogen content on the laminar burning velocity and the Markstein length has been evaluated: the relative weight and mutual
Cardiac tamponade arises due to equalisation of cardiac pressures leading to impaired biventricular filling. The pericardial sack has some elasticity which is quickly reached with fluid accumulation. Cardiac volume becomes smaller during systole and venous return shifts to cardiac systole to reduce cardiac output. Normally, systemic venous return to the right side of the heart increases with inspiration and pulmonary venous return to the left heart decreases with inspiration so that systemic arterial pressure normally falls by ,10 mmHg during inspiration.. In cardiac tamponade, the rigid pericardium prevents the free wall from expanding. Thus, the distension of the right ventricle is limited to the interventricular septum and this causes the septum to bulge to the left, reducing left ventricular compliance and contributing to further decreased filling of the left ventricle during inspiration. This leads to an exaggerated drop in systolic blood pressure in inspiration called pulsus paradoxus. Our ...
Cardiovascular magnetic resonance imaging (CMR), sometimes known as cardiac MRI, is a medical imaging technology for the non-invasive assessment of the function and structure of the cardiovascular system. It is derived from and based on the same basic principles as magnetic resonance imaging (MRI) but with optimization for use in the cardiovascular system. These optimizations are principally in the use of ECG gating and rapid imaging techniques or sequences. By combining a variety of such techniques into protocols, key functional and morphological features of the cardiovascular system can be assessed. In the investigation of cardiovascular disease the physician has a wide variety of tools available. The key disadvantages of CMR are limited availability, expense, and special skills/technical training needed to perform CMR (vs other types of MRI). New volumetric acquisitions can shorten and simplify the scan as they can replace several sequences, acquiring the entire cardiac volume at once. The ...
The value of the end systolic volume depends on the arterial blood pressure as well as on the force of ventricular contraction. The arterial blood pressure - especially in the large arteries leaving the heart - is not only pressure outwards against the arterial walls but also back pressure against the aortic valve and the pulmonary valve exerted by the arterial blood. An increased arterial blood pressure results in higher end systolic volume because of more afterload (more resistance to the outflow of blood from the ventricles). Contractility of the ventricular muscle can increase (e.g. from increased stimulation of the heart by the sympathetic nervous system), thereby causing more complete ejection of blood from the ventricle and a resultant lower end systolic volume. ...
The paper describes an experimental activity on the spatial and temporal liquid- and vapor-phase distributions of diesel fuel at engine-like conditions. The influence of the k-factor (0 and 1.5) of a single-hole axial-disposed injector (0.100 mm diameter and 10 L/d ratio) has been studied by spraying fuel in an optically-accessible constant-volume combustion vessel.A high-speed imaging system, capable of acquiring Mie-scattering and Schlieren images in a near simultaneous fashion mode along the same line of sight, has been developed at the Michigan Technological University using a high-speed camera and a pulsed-wave LED system. The time resolved pair of schlieren and Mie-scattering images identifies the instantaneous position of both the vapor and liquid phases of the fuel spray, respectively. The studies have been performed at three injection pressures (70, 120 and 180 MPa), 23.9 kg/m3 ambient gas density and 900 K gas temperature in the vessel. A pre-combustion of reactants filling the vessel ...
Min Zi, a cardiovascular researcher from the University of Manchester uses PV Loop and hemodynamic analyses to investigate the molecular processes that lead to the development of cardiac hypertrophy with the goal to uncover new and effective treatments of the disease.
... the beat cycle.Automated In Vivo Hypercholesterolemia ScreenFigure 4. Waveform
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The purpose of this article is to present our experience with normal and abnormal fetal cardiac structures reconstructed in the HDlive silhouette mode (GE Healthcare Japan, Tokyo, Japan) with spatiotemporal image correlation (STIC). Twenty-two fetuses with normal hearts and 1 fetus with a congenita...
Real-time three-dimensional echocardiography for determining right ventricular stroke volume in an animal model of chronic right ventricular volume overload.
In the present study, the right ventricles of 10 Beagle dogs were investigated by means of 3DE and CCT in comparison with the reference method CMRI. The major challenge for determining right ventricular volume is the right ventricle itself. The complex shape with its segmentation in body, inflow and outflow tract, the thin RV wall and the heavy trabeculation make the RV measurement in two-dimensional echocardiography difficult [6]. CMRI is the gold standard for RV volumetric quantification in human medicine [18] and overcomes the limitation of 2D echocardiography by using a three-dimensional volume set, as well as the 3D modalities 3DE and CCT. Although the assessment of left ventricular function using two- and three-dimensional volume estimation is part of various veterinary publications [27]-[30], there are to the best knowledge of the author no veterinary studies concerning the evaluation of right ventricular function either by means of two-dimensional volume calculation or even ...
Purpose:To compare indexed right ventricular (RV) end-diastolic volume (RVEDVi) and the ratio of RV volume to left ventricular (LV) volume (RV/LV ratio) in prediction of significant pulmonary regurgitation (PR) after tetralogy of Fallot (TOF) repair
Nuclear fuel technology - Tank calibration and volume determination for nuclear materials accountancy - Part 6: Accurate in-tank determination of liquid density in accountancy tanks equipped with dip tubes
LONDON - In the past year, total sales of heart failure (HF) therapeutics across the 7 major markets (including Japan, the US and 5EU) were estimated at around USD 3.2 billion. This figure is predicted to increase in the years to come, registering a 13.5% CAGR. By 2025, total heart failure therapeutics sales across 7MM are likely to touch USD 11.5 billion.. Meantime, the chronic heart failure therapeutics market across 7MM is expected to increase from USD 3.1 billion in the previous year up to USD 10.1 billion by 2025, posting a CAGR of 12.7%. In 2015, the US dominated the chronic heart failure therapies market, accounting for a share of over 60% of total sales. The uptake of Novartis Entresto is anticipated to perform as a strong driver of the chronic heart failure and also total heart failure markets in the 7MM; in 2022 it will likely reach peak sales worth of USD 5.9 billion.. The acute heart failure therapeutics market is expected to grow from USD 188.1 million in the past year to around ...
By combining conventional methods for recording pressures from the left ventricle and pleural cavity with a new procedure for estimating end-diastolic volume (EDV) and end-systolic volume (ESV) of the left ventricle it was found in the closed-chest dog that plethora increased EDV, ESV and stroke volume while hemorrhage had the opposite effect. There were linear relationships between EDV and ESV, and between EDV and stroke volume. There was little change in left ventricular "effective" end-diastolic pressure when the EDV changed over a wide range, beginning with the smallest EDV consistent with life; but after a certain large EDV had been reached, large increases in effective end-diastolic pressure were associated with little or no further increase in EDV.. ...
TY - JOUR. T1 - Three-dimensional echocardiography for left ventricular quantification: fundamental validation and clinical applications. AU - van der Heide, J.A.. AU - Kleijn, S.A.. AU - Aly, M.F.A.. AU - Slikkerveer, J.. AU - Kamp, O.. PY - 2011. Y1 - 2011. U2 - 10.1007/s12471-011-0160-y. DO - 10.1007/s12471-011-0160-y. M3 - Article. VL - 19. SP - 423. EP - 431. JO - Netherlands Heart Journal. JF - Netherlands Heart Journal. SN - 1568-5888. IS - 10. ER - ...
Robert M. Hansen, Christian E. Viquerat, Michael A. Matthay, Jeanine P. Wiener-Kronish, Teresa DeMarco, Satinder Bahtia, James D. Marks, Elias H. Botvinick, Kanu Chatterjee; Poor Correlation Between Pulmonary Arterial Wedge Pressure and Left Ventricular End-diastolic Volume after Coronary Artery Bypass Graft Surgery. Anesthesiology 1986;64(6):764-770. Download citation file:. ...
BACKGROUND: Whether the myocardium in nonischemic heart failure experiences oxygen limitation remains a long-standing controversy. We addressed this question in patients with dilated cardiomyopathy (DCM) using a dual approach. First, we tested the changes in myocardial oxygenation between rest and stress states, using oxygenation-sensitive cardiovascular magnetic resonance. Second, we sought to assess the functional consequences of oxygen limitation at rest by measuring myocardial energetics before and after short-term oxygen supplementation. METHODS AND RESULTS: Twenty-six subjects (14 DCM and 12 normal) underwent cardiac magnetic resonance imaging at 3 Tesla to assess cardiac volumes, function, oxygenation, and first-pass perfusion (0.03 mmol/kg Gd-DTPA bolus) at stress and rest (4-6 minutes IV adenosine, 140 μg/kg per minute). Signal intensity change (SIΔ) and myocardial perfusion reserve index (MPRI) were measured from oxygenation and perfusion images, respectively. Furthermore, the effect of
The assessment of left ventricular (LV) volume and ejection fraction (EF) is vital to the practice of cardiology. These measures are used to inform prognosis in most cardiac patient populations, determine treatment decisions for a variety of therapies, and function as eligibility criteria in many clinical trials (1-5). Despite their importance, there is no consensus on the best method to routinely measure EF and volumes.. Two-dimensional echocardiography (2DE) is the most ubiquitous tool for assessing LV size and systolic function. Measurement of EF is the most common reason for referring a patient for an echocardiogram (6). This test is noninvasive, portable, inexpensive, radiation free, and quick. It does not, however, provide reliable, reproducible, and accurate measures of EF or volumes (7). Traditionally, 2DE has used the method of disks to calculate LV volumes based on areas in only 2 imaging planes (6). This method is subject to errors due to foreshortening, poor endocardial definition, ...
In 10 normal dogs, the right and left ventricular volumes and compliances were determined in the fresh post-mortem heart. With the use of a SigmaMotor pump, Ringers solution at 23°C was simultaneously infused into both ventricles within an hour after death. When the ventricles were full but open to atmospheric pressure, the mean volumes were 35.8 ml/m2 for the right and 23.1 ml/m2 for the left ventricle; when the transmural pressure was increased by 10 mm Hg, the mean volumes were 56.9 ml/m2 for the right and 41.9 ml/m2 for the left ventricle; at 20 mm Hg, the values were 60.8 and 48.5 ml/m2, respectively. The initial volumes and the increases in volume produced by increase in transmural pressure were affected by the position of the ventricular septum and by the presence of rigor mortis. With infusions into only one ventricle, right and left ventricular volumes were 20 to 74% greater at 10 mm Hg than the values when both ventricles were filled simultaneously. Compliance began to decrease 40 to ...
ABSTRACT: Ventricular pressure-volume area (PVA) is a specific area in the pressure-volume diagram, which represents the total mechanical energy generated by each contraction, consisting of stroke work and mechanical potential energy at end-systole. Animal experiments have shown that PVA is correlated linearly with the ventricular oxygen consumption (Vo2) per beat under a variety of loading conditions in a stable contractile state. The slope of the Vo2-PVA line has been shown to remain constant in different contractile states, implying a constant stoichiometry between Vo2 and PVA. As a first step to understand the nature of this Vo2-PVA relation, we devised a new crossbridge (CB) model to theoretically relate PVA with the total enthalpy change associated with the ATP hydrolysis for all CB cycles. One of the most important assumptions on which this model analysis depended was that the time-varying elasticity model could simulate the instantaneous pressure-volume relation. The result of this ...
Data & statistics on Relationship between heart rate and oxygen consumption: Relationship between heart rate and oxygen consumption, Cardioplegia volume ( A ) , total heart oxygen consumption (LV MVO,, in milliliters of oxygen; B), and arterial-venous oxygen content diferences (C) during each delivey interval. Duration of induction was 5 minutes at 4
Effects of new single-nucleotide polymorphisms (SNPs) on genome-wide association study results. In both cases, the phenotype being used is total heart weight af
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In the professional opinion of one person who I was reading the confusion on the subject of kettlebells vs. dumbbells comes from a lack of proper instruction regarding how to practice with kettlebells. As a direct result many people make the critical mistake of attempting to use kettlebells as if they were traditional weights.. Traditional weight lifting is what is single-plane static. This refers to how your body is in a fixed position while moving weight towards and away from you in a linear manner through a direct line of applied force. All the while attempting not to use any momentum and targeting an isolated muscle or muscle group. Whats more traditional weight lifting builds muscles differently. Generally speaking the goal of bodybuilding is muscle hypertrophy meaning an increase in muscle size. Unfortunately most people associate size with strength. What most people do not know is that 50-70-percent of hypertrophy size is from fluid called Sarcoplasm. Sarcoplasmic Volume accounts for ...
Biography: Dr. Teeters research focuses on image-based orthopedic implant design and evaluation, including 3D printing technologies and imaging techniques such as micro-CT, CT, RSA, and single-plane fluoroscopy. He has a particular interest in implant wear, and directs the Implant Retrieval Laboratory at LHSC. ...
... analysis is not only used for the determination of BET-surface area but for the analysis of pore size distribution and total pore volume determination as well.
Eventbrite - ADInstruments Limited presents Pressure-Volume Techniques & Analysis Practical Workshop, Prague: Day 1 - Thursday, 22 June 2017 at IKEM. Find event and registration information.
The LogoRevealer volume in the Motion Design Elements Collection comes onscreen, covers a predefined area and then animates offscreen to reveal something underneath. This volume can be used to reveal not only text but logos and other graphics as well ...
TY - JOUR. T1 - Reference range for fetal interventricular septum area by means of four-dimensional ultrasonography using spatiotemporal image correlation. AU - Nardozza, Luciano Marcondes Machado. AU - Rolo, Liliam Cristine. AU - Araujo Júnior, Edward. AU - Hatanaka, Alan Roberto. AU - Rocha, Luciane Alves. AU - Simioni, Christiane. AU - Ruano, Rodrigo. AU - Moron, Antonio Fernandes. PY - 2013/1/1. Y1 - 2013/1/1. N2 - Objective: To determine reference range for fetal interventricular septum area by means of 3-dimensional ultrasonography (3DUS) using the spatiotemporal image correlation (STIC) method. Methods: A prospective, cross-sectional study was conducted on 328 normal pregnant women between the 18th and 33rd gestational weeks. To obtain the interventricular septum area, a virtual plane was used, with the green line (region of interest) adjacent to the external margin of the septum, which was manually delimited. To evaluate the correlation of the septum area with the gestational age, ...
Milani, R. V., Davis, C. T., Lavie, C. J. and Mehra, M. R. (2005). Importance of left atrial volume in predicting reduced peak aerobic capacity in advanced systolic dysfunction. In: Journal of Heart and Lung Transplantation. , , (S129-S130). . doi:10.1016/j.healun.2004.11.292 ...
Background: The aim of the study is to determine the relationship of left atrial volume index (LAVI) with the clinical presentation, comorbidities, and adverse events in acute coronary syndrome (ACS) patients at admission and during their follow-up. Methods: A total of 160 ACS patients enrolled have been divided into Group A (LAVI , 34 ml/m2) and Group B ( LAVI ≤ 34 ml/m2). The symptoms and the LAVI have been assessed at 1, 6, and 12 months of follow-up. The primary end point was cardiovascular (CV) mortality. The secondary end point is the occurrence of major adverse CV events, i.e., repeat hospitalization postdischarge for heart failure, reinfarction, atrial fibrillation, or ischemic stroke. Results: Overall, the median age at presentation was 55 years. There was no sex predilection for increased LAVI or an association with conventional risk factors. The echocardiographic E wave velocity divided by propagation velocity had a positive correlation with the LAVI (r = 0.321, P = 0.0036). The ...
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The functions of neurons and the nervous system can be understood through an analogy (the parallel conductance model) with electrical circuits. This chapter provides an introduction to the electrical terms and concepts that undergird this analogy. It begins with brief descriptions of the components that make up electrical circuits; namely, batteries, resistors, conductors, and capacitors. The basic quantities that describe these circuits are current, voltage, resistance, and capacitance. Ohms law is introduced and together with Kirchhoffs rules, applied to electrical circuits constructed from the elemental components. Finally, equations that are fundamental for understanding the parallel conductance model and its relationship to cell membrane potentials are derived.
Summary: The strange and secretive habits of the inhabiters of the Black Order come into light. First Habit: What could Lavi possibly be doing so early in the morning?!. Disclaimer: If I owned D. Gray-Man, I wouldnt be writing my story HERE would I? Id be putting them down in bonus pages of the manga! --rolls eyes-- I probably dont even own this idea, I got this sometime while reading "Ask Rabi" and "Reasons Why Exorcists DONT Have Internet" .... Note: Lavi/Rabi/Ravi, Ill just be using the spelling I found in the official manga... Ill write about 2 to 3 chapters and if I only get like 0-2 reviews, Ill drop this before my self-esteem does... Well, hope you enjoy!. -------------------------------. Lavi was lying down on his bed trying to find something interesting to look at, or anything in general that would make it feel as if time moved faster. He glanced over at the clock once more that was miraculously still visible and functioning under the unbelievably huge stacks of paper he and ...