Transesophageal (M-Mode and Two-Dimensional) Echocardiography

Hanrath, Peter; Schlüter, Michael; Langenstein, B. A.; Souquet, Jacques; Polster, J.; Kremer, P.

doi:10.1007/978-94-009-6790-8_6

Cited by 5 publications

(5 citation statements)

References 12 publications

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“…In our previous DMRG study on the decomposition of DMRG basis states into a Slater determinant basis [21], we had already observed that the energy can decrease during DMRG iterations, while the corresponding DMRG wave function was qualitatively wrong when compared to the FCI solution. We should recall from the introduction that similar results have been reported in the literature for CC calculations [53,54].…”

Section: Quantum Fidelity As a Measure For Dmrg Convergencesupporting

confidence: 77%

“…An analysis of DMRG wave functions in terms of CI expansion coefficients will be useful to better understand the quality of the converged DMRG result as the electronic energy is not sufficient as a sole criterion to assess the accuracy obtained [21]. Also for well-established electron-correlation models based on the CC approach Hanrath [53,54] has observed for the H 4 and HF model systems that considering the energy as the only convergence criterion is not sufficient. Only an analysis of the underlying CC wave function revealed artifacts in the wave function expansion.…”

Section: Introductionmentioning

confidence: 99%

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Construction of CASCI-type wave functions for very large active spaces

Boguslawski

Marti

Reiher

2011

The Journal of Chemical Physics

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We present a procedure to construct a configuration-interaction expansion containing arbitrary excitations from an underlying full-configuration-interaction-type wave function defined for a very large active space. Our procedure is based on the density-matrix renormalization group (DMRG) algorithm that provides the necessary information in terms of the eigenstates of the reduced density matrices to calculate the coefficient of any basis state in the many-particle Hilbert space. Since the dimension of the Hilbert space scales binomially with the size of the active space, a sophisticated Monte Carlo sampling routine is employed. This sampling algorithm can also construct such configurationinteraction-type wave functions from any other type of tensor network states. The configurationinteraction information obtained serves several purposes. It yields a qualitatively correct description of the molecule's electronic structure, it allows us to analyze DMRG wave functions converged for the same molecular system but with different parameter sets (e.g., different numbers of active-system (block) states), and it can be considered a balanced reference for the application of a subsequent standard multi-reference configuration-interaction method.

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Section: Quantum Fidelity As a Measure For Dmrg Convergencesupporting

confidence: 77%

Section: Introductionmentioning

confidence: 99%

Construction of CASCI-type wave functions for very large active spaces

Boguslawski

Marti

Reiher

2011

The Journal of Chemical Physics

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“…However, it remains to be shown which agents, e.g. calcium channel blockers, have direct effects on im proving LV diastolic properties [20].…”

Section: Discussionmentioning

confidence: 99%

Left Ventricular Diastolic Filling Properties in Diabetic Patients during Isometric Exercise

Tarumi

Iwasaka²,

Takahashi³

et al. 1993

Cardiology

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Left ventricular diastolic filling properties during isometric handgrip exercise were measured by pulsed Doppler echocardiography in 33 noninsulin-dependent diabetic patients with a normal ejection fraction and 15 control subjects. Diabetic patients were subdivided into two groups according to their resting left ventricular filling pattern (A/E): 18 patients were in group DM-1 (A/E ≤ 1.1) and 15 patients were in group DM-2 (A/E > 1.1). At rest, A/E ratio and A wave were higher, and deceleration half-time was longer in group DM-2 than in normal subjects and group DM-1, but there was no significant difference between normal subjects and group DM-1. The A/E ratio increased significantly in all three groups during isometric handgrip exercise. However, the change in A/E from rest to peak exercise in group DM-1 (0.29 ± 0.20) was significantly greater than in normal subjects (0.09 ± 0.07). These results suggest that diabetes mellitus patients with normal resting left ventricular (LV) filling pattern (group DM-1) had LV diastolic filling abnormalities with isometric handgrip exercise. Doppler echocardiography with isometric handgrip exercise is useful in identifying underlying left ventricular diastolic dysfunction in diabetic patients.

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“…Transesophageal echocardiography has overcome this methodical problem. With high resolution and good quality, structures of the heart can be imaged [33,34]. It has been proved to be superior to the transthoracic approach in detection of valve vegetations in patients with infective endocardits [35].…”

Section: Discussionmentioning

confidence: 99%

Echocardiographic and angiographic evaluation of left ventricular function during percutaneous transluminal aortic valvuloplasty

Sack¹,

Henrichs²,

Erbel³

et al. 1992

Cathet. Cardiovasc. Diagn.

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Transesophageal echocardiography was used to study the effect of the balloon inflation on left ventricular function in 20 patients with critical aortic stenosis undergoing balloon valvuloplasty. Balloon inflation caused an increase of end-diastolic (15% to 34%) and end-systolic (57% to 72%) left ventricular volume. Left ventricular wall stress increased from 30 +/- 10 x 10(3) dyn/cm2 at diastole and 121 +/- 40 x 10(3) dyn/cm2 at systole to 44 +/- 11 x 10(3) dyn/cm2 and 191 +/- 55 x 10(3) dyn/cm2, respectively, when the balloon was inflated (P less than 0.05). Turbulent regurgitant jet across the mitral valve increased from 15 +/- 2% to 25 +/- 3% during balloon inflation (P less than 0.01). Continued monitoring of left ventricular function after balloon deflation demonstrated prolonged enlargement of left ventricular volumes. Our data show that balloon inflation causes an increase of left ventricular volume and impairment of contraction. Increase of left ventricular wall stress--associated with a reduction of coronary blood flow, due to lower aortic pressure--could result in ischemic myocardial injury.

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Transesophageal (M-Mode and Two-Dimensional) Echocardiography

Cited by 5 publications

References 12 publications

Construction of CASCI-type wave functions for very large active spaces

Construction of CASCI-type wave functions for very large active spaces

Left Ventricular Diastolic Filling Properties in Diabetic Patients during Isometric Exercise

Echocardiographic and angiographic evaluation of left ventricular function during percutaneous transluminal aortic valvuloplasty

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