Helical Structure of the Cardiac Ventricular Anatomy Assessed by Diffusion Tensor Magnetic Resonance Imaging With Multiresolution Tractography

Poveda, Ferran; Gil, Débora; Martı́, Enric; Andaluz, Anna; Ballester, Manel; Carreras, Francesc

doi:10.1016/j.rec.2013.04.021

Cited by 33 publications

(34 citation statements)

References 29 publications

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“…[16][17][18] In contrast to some previous work [19][20], our model predicts a less important role for the twisting factor in delivering substantial values for ejection fraction during systolic phase. The following brief model places an upper bound of 5% on the twisting effect in ejection fraction; 5% is for normal heart mass ratio and 4% is for dilated heart mass ratio.…”

Section: Overall Left Ventricular Twistingcontrasting

confidence: 69%

The Separate Effects of Wall-Thickening and Epicardial Volume as Determinants of Left Ventricular Ejection Fraction

Zhou¹

2017

EJCBS

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Ventricular torque magically pushes systolic ejection fraction, and such torsional moments originate in the Frenet frame of a curve of cardiac muscle. Since surgical treatments involve preoperative anatomy calculations of the cardiac muscle, the understanding of chamber geometric effects may guide left ventricular chamber-reduction surgery. We decomposed ejection fraction for an interpretation of geometric parameters in restoration and optimization of cardiac function. Three systolic geometric parameters--sphericity, contractility, ventricular torsion--were extracted for the ejection fraction from an epicardial view. The decomposing approach allowed us to estimate each factor's contribution to the total ejection fraction with the exception of the myocardium-to-chamber volume ratio, which represented the thickening effect during systole. All other effects took parts in 'shrinkage factor' (β), which corresponded the ejection fraction with an infinitesimal layer of muscle. Through comparing parameters for left ventricular ejection fraction, geometrical rearrangement of muscle bands for ventricular torsion is the most effective mechanical axis during partial left ventriculectomy, while ventricular shape factor only plays a less important role during systole in dilated cardiomyopathy, which often misleads the surgeon's assessment.

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Section: Overall Left Ventricular Twistingcontrasting

confidence: 69%

The Separate Effects of Wall-Thickening and Epicardial Volume as Determinants of Left Ventricular Ejection Fraction

Zhou¹

2017

EJCBS

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“…Recently, Poveda et al succeeded in visualization of ventricular myocardial fiber architecture in the canine myocardium by using diffusion tensor MRI and tracography reconstruction. 35 Future MRI developments may enable advanced investigation of LA myofiber orientation and refine our results.…”

Section: Discussionmentioning

confidence: 55%

Association of Left Atrial Local Conduction Velocity With Late Gadolinium Enhancement on Cardiac Magnetic Resonance in Patients With Atrial Fibrillation

Fukumoto

Habibi

İpek

et al. 2016

Circ: Arrhythmia and Electrophysiology

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Background Prior studies have demonstrated regional left atrial late gadolinium enhancement (LGE) heterogeneity on magnetic resonance imaging. Heterogeneity in regional conduction velocities is a critical substrate for functional reentry. We sought to examine the association between left atrial conduction velocity and LGE in patients with atrial fibrillation (AF). Methods and Results LGE imaging and left atrial activation mapping were performed during sinus rhythm in 22 patients prior to pulmonary vein isolation. The locations of 1468 electroanatomic map points were registered to the corresponding anatomic sites on 469 axial LGE image planes. The local conduction velocity at each point was calculated using previously established methods. The myocardial wall thickness and image intensity ratio (IIR) defined as left atrial myocardial LGE signal intensity divided by the mean left atrial blood pool intensity was calculated for each mapping site. The local conduction velocity and IIR in the left atrium (mean ± standard deviation) were 0.98±0.46 m/sec and 0.95±0.26, respectively. In multivariable regression analysis, clustered by patient, and adjusting for left atrial wall thickness, conduction velocity was associated with the local IIR (0.20 m/sec decrease in conduction velocity per increase in unit IIR, P<0.001). Conclusions In this clinical in vivo study we demonstrate that left atrial myocardium with increased gadolinium uptake has lower local conduction velocity. Identification of such regions may facilitate the targeting of the substrate for reentrant arrhythmias.

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“…that obtainable with Diffusion Tensor Imaging, [29]), here precludes drawing quantitative conclusions regarding the tissue anisotropy of the tested ventricular wall sample. An accurate FE model for inverse material characterization, in fact, should incorporate the information above together with a full three-dimensional description of morphology and boundary conditions and this is beyond the scope of this work.…”

Section: Discussionmentioning

confidence: 98%

Full-surface deformation measurement of anisotropic tissues under indentation

Genovese

Montes

Martı́nez

et al. 2015

Medical Engineering & Physics

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Helical Structure of the Cardiac Ventricular Anatomy Assessed by Diffusion Tensor Magnetic Resonance Imaging With Multiresolution Tractography

Cited by 33 publications

References 29 publications

The Separate Effects of Wall-Thickening and Epicardial Volume as Determinants of Left Ventricular Ejection Fraction

The Separate Effects of Wall-Thickening and Epicardial Volume as Determinants of Left Ventricular Ejection Fraction

Association of Left Atrial Local Conduction Velocity With Late Gadolinium Enhancement on Cardiac Magnetic Resonance in Patients With Atrial Fibrillation

Full-surface deformation measurement of anisotropic tissues under indentation

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