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Arita Y, Hirata K, Wada N, Komukai K, Tanimoto T, Kitabata H, Takarada S, Nakamura N, Kubo T, Tanaka A, Imanishi T, Akasaka T. Altered Coronary Flow Velocity Reserve and Left Ventricular Wall Motion Dynamics: A Phenomenon in Hypertensive Patients with ECG Strain. Echocardiography 2013; 30:634-43. [DOI: 10.1111/echo.12104] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Affiliation(s)
- Yu Arita
- Department of Medicine; Wakayama Medical University; Wakayama; Japan
| | - Kumiko Hirata
- Department of Medicine; Wakayama Medical University; Wakayama; Japan
| | - Nozomi Wada
- Department of Medicine; Wakayama Medical University; Wakayama; Japan
| | - Kenichi Komukai
- Department of Medicine; Wakayama Medical University; Wakayama; Japan
| | - Takashi Tanimoto
- Department of Medicine; Wakayama Medical University; Wakayama; Japan
| | - Hironori Kitabata
- Department of Medicine; Wakayama Medical University; Wakayama; Japan
| | - Shigeho Takarada
- Department of Medicine; Wakayama Medical University; Wakayama; Japan
| | - Nobuo Nakamura
- Department of Medicine; Wakayama Medical University; Wakayama; Japan
| | - Takashi Kubo
- Department of Medicine; Wakayama Medical University; Wakayama; Japan
| | - Atsushi Tanaka
- Department of Medicine; Wakayama Medical University; Wakayama; Japan
| | - Toshio Imanishi
- Department of Medicine; Wakayama Medical University; Wakayama; Japan
| | - Takashi Akasaka
- Department of Medicine; Wakayama Medical University; Wakayama; Japan
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Nakamura N, Hirata K, Imanishi T, Kuroi A, Arita Y, Ikejima H, Tsujioka H, Takemoto K, Tanimoto T, Kitabata H, Takarada S, Kubo T, Mizukoshi M, Tanaka A, Arita M, Akasaka T. Electrocardiographic strain and endomyocardial radial strain in hypertensive patients. Int J Cardiol 2011; 150:319-24. [DOI: 10.1016/j.ijcard.2010.04.049] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/08/2009] [Revised: 01/22/2010] [Accepted: 04/17/2010] [Indexed: 11/29/2022]
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Chuang JS, Zemljic-Harpf A, Ross RS, Frank LR, McCulloch AD, Omens JH. Determination of three-dimensional ventricular strain distributions in gene-targeted mice using tagged MRI. Magn Reson Med 2011; 64:1281-8. [PMID: 20981782 DOI: 10.1002/mrm.22547] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
A model-based method for calculating three-dimensional (3D) cardiac wall strain distributions in the mouse has been developed and tested in a genetically engineered mouse model of dilated cardiomyopathy. Data from MR tagging and harmonic phase (HARP) tracking were used to measure material point displacements, and 3D Lagrangian strains were calculated throughout the entire left ventricle (LV) with a deformable parametric model. A mouse model where cardiomyocytes are specifically made deficient in vinculin (VclKO) were compared to wild-type (WT) littermates. 3D strain analysis revealed differences in LV wall mechanics between WT and VclKO mice at 8 weeks of age when systolic function had just begun to decline. Most notably, end-systolic radial strain and torsional shear were reduced in VclKO hearts which contributed to regional mechanical dysfunction. This study demonstrates the feasibility of using MRI tagging methods to detect alterations in 3D myocardial strain distributions in genetically engineered mouse models of cardiovascular disease.
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Affiliation(s)
- Joyce S Chuang
- Department of Bioengineering, University of California-San Diego, La Jolla, California, USA
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Tanimoto T, Imanishi T, Tanaka A, Yamano T, Kitabata H, Takarada S, Kubo T, Takemoto K, Nakamura N, Hirata K, Mizukoshi M, Akasaka T. Bedside Assessment of Myocardial Viability Using Transmural Strain Profile in Patients With ST Elevation Myocardial Infarction: Comparison With Cardiac Magnetic Resonance Imaging. J Am Soc Echocardiogr 2009; 22:1015-21. [DOI: 10.1016/j.echo.2009.06.024] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/04/2009] [Indexed: 10/20/2022]
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Hasegawa T, Nakatani S, Kanzaki H, Abe H, Kitakaze M. Heterogeneous Onset of Myocardial Relaxation in Subendocardial and Subepicardial Layers Assessed With Tissue Strain Imaging. JACC Cardiovasc Imaging 2009; 2:701-8. [DOI: 10.1016/j.jcmg.2008.11.019] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/19/2008] [Revised: 11/06/2008] [Accepted: 11/16/2008] [Indexed: 10/20/2022]
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Tanabe M, Lamia B, Tanaka H, Schwartzman D, Pinsky MR, Gorcsan J. Echocardiographic speckle tracking radial strain imaging to assess ventricular dyssynchrony in a pacing model of resynchronization therapy. J Am Soc Echocardiogr 2009; 21:1382-8. [PMID: 19041581 DOI: 10.1016/j.echo.2008.09.012] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/25/2008] [Indexed: 11/28/2022]
Abstract
BACKGROUND Speckle tracking imaging is a promising new echocardiographic method to assess left ventricular (LV) mechanical dyssynchrony. Our aim was to assess a new speckle tracking regional strain algorithm by comparison with angle-corrected tissue Doppler (TD) in an animal model of left bundle branch block and cardiac resynchronization therapy. METHODS AND RESULTS Ten open-chest dogs had routine gray-scale and TD images of the mid-LV short-axis plane. Electrical activation was altered by pacing from right ventricular, LV free wall, and biventricular sites to create various degrees of mechanical dyssynchrony and alter regional function. Segmental time to peak strain, peak strain, and frame-by-frame strain were measured by angle-corrected TD, TD M-mode, and speckle tracking on the same digital cineloop. Of 240 possible paired TD and speckle tracking segments, data were available for 222 segments (93%); images with catheter artifacts were prospectively excluded. Comparative overall time to peak strain by each method correlated well: r = 0.96, bias = -6 +/- 20 ms. Of 80 possible paired M-mode TD and speckle tracking segments, strain data were available for 76 segments (95%). Comparative overall time to peak strain, peak strain, and frame-by-frame strain analysis in 1012 frames by each method correlated well: r = 0.98, bias of 1 +/- 14 ms; r = 0.82, bias of 3% +/- 7%; and r = 0.91, bias of 0% +/- 6%, respectively. CONCLUSION Regional strain analysis using echocardiographic speckle tracking radial strain strongly correlated with strain by angle-corrected TD imaging in an animal model of dyssynchrony. Speckle tracking radial strain has potential for clinical applications.
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Affiliation(s)
- Masaki Tanabe
- The Cardiovascular Institute and Department of Critical Care Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania, USA
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Akagawa E, Murata K, Tanaka N, Yamada H, Miura T, Kunichika H, Wada Y, Hadano Y, Tanaka T, Nose Y, Yasumoto K, Kono M, Matsuzaki M. Augmentation of left ventricular apical endocardial rotation with inotropic stimulation contributes to increased left ventricular torsion and radial strain in normal subjects: quantitative assessment utilizing a novel automated tissue tracking technique. Circ J 2007; 71:661-8. [PMID: 17456988 DOI: 10.1253/circj.71.661] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
BACKGROUND The difference in the left ventricular (LV) torsion of the endo- and epicardium (Endo, Epi) with inotropic stimulation and its relation to radial strain (RS) remain unclear. METHODS AND RESULTS LV basal and apical short-axis images were recorded in 13 normal subjects at rest and during dobutamine infusion (5, 10 microg x kg (-1) x min(-1)). A total of 8 points (anterior, lateral, posterior and septum in both Endo and Epi) were manually placed by 2-dimensional tissue tracking technique and the movement of these points during a cardiac cycle was tracked, after which the rotation angles and RS were calculated. LV torsion was defined as the net difference between the basal and apical rotations. In the LV apex, Endo-rotation increased (7.8+/-2.7 to 14.1+/-4.6 degrees, p<0.01), whereas Epi-rotation was unchanged, with dobutamine. The apical Endo-rotation was significantly greater than the Epi-rotation, although no difference was seen between the Endo and Epi in the LV base throughout the study. During dobutamine infusion, the LV Endo-torsion increased (9.5+/-2.8 to 19.3+/-4.8 degrees, p<0.01) and these values were greater than those for Epi. The apical RS increased with the dobutamine dose (39.0+/-9.3 to 61.9+/-15.5%, p<0.01), whereas basal RS initially increased at 5 microg x kg(-1) x min(-1), but thereafter showed no further increase at 10 microg x kg(-1) x min(-1) of dobutamine. CONCLUSIONS Augmentation of LV rotation with inotropism was clearly observed in the apical Endo, thus causing increased LV endo-torsion and apical RS.
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Affiliation(s)
- Eizo Akagawa
- Division of Cardiology, Department of Medicine and Clinical Science, Yamaguchi University Graduate School of Medicine, Ube, Japan
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Maruo T, Nakatani S, Jin Y, Uemura K, Sugimachi M, Ueda-Ishibashi H, Kitakaze M, Ohe T, Sunagawa K, Miyatake K. Evaluation of transmural distribution of viable muscle by myocardial strain profile and dobutamine stress echocardiography. Am J Physiol Heart Circ Physiol 2006; 292:H921-7. [PMID: 17012363 DOI: 10.1152/ajpheart.00019.2006] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Transmural distribution of viable myocardium in the ischemic myocardium has not been quantified and fully elucidated. To address this issue, we evaluated transmural myocardial strain profile (TMSP) in dogs with myocardial infarction using a newly developed tissue strain imaging. TMSP was obtained from the posterior wall at the epicardial left ventricular short-axis view in 13 anesthetized open-chest dogs. After control measurements, the left circumflex coronary artery was occluded for 90 min to induce subendocardial infarction (SMI). Subsequently, latex microbeads (90 microm) were injected in the same artery to create transmural infarction (TMI). In each stage, measurements were done before and after dobutamine challenge (10 microg.kg(-1).min(-1) for 10 min) to estimate transmural myocardial viability. Strain in the subendocardium in the control stage increased by dobutamine (from 53.6 +/- 17.1 to 73.3 +/- 21.8%, P < 0.001), whereas that in SMI and TMI stages was almost zero at baseline and did not increase significantly by dobutamine [from 0.8 +/- 8.8 to 1.3 +/- 7.0%, P = not significant (NS) for SMI, from -3.9 +/- 5.6 to -1.9 +/- 6.0%, P = NS for TMI]. Strain in the subepicardium increased by dobutamine in the control stage (from 23.9 +/- 6.1 to 26.3 +/- 6.4%, P < 0.05) and in the SMI stage (from 12.4 +/- 7.3 to 27.1 +/- 8.8%, P < 0.005), whereas that in the TMI stage did not change (from -1.0 +/- 7.8 to -0.7 +/- 8.3%, P = NS). In SMI, the subendocardial contraction was lost, but the subepicardium showed a significant increase in contraction with dobutamine. However, in TMI, even the subepicardial increase was not seen. Assessment of transmural strain profile using tissue strain imaging was a new and useful method to estimate transmural distribution of the viable myocardium in myocardial infarction.
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Affiliation(s)
- Takeshi Maruo
- Department of Cardiology, National Cardiovascular Center, 5-7-1, Fujishiro-dai, Suita, Osaka 565-8565, Japan
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Garcia-Fernandez MA, Bermejo J, Perez-David E, Lopez-Fernandez T, Ledesma MJ, Caso P, Malpica N, Santos A, Moreno M, Desco M. New Techniques for the Assessment of Regional Left Ventricular Wall Motion. Echocardiography 2003; 20:659-72. [PMID: 14536016 DOI: 10.1046/j.1540-8175.2003.t01-1-03036.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The assessment of regional left ventricular (LV) function has been an important yet unresolved problem since the introduction of echocardiography as a diagnostic tool. Abnormal regional LV wall motion is an early finding in multiple cardiac pathologies and its diagnosis is of critical importance. In the last few years diagnostic procedures based on combined use of existing echocardiographic technologies were geared toward improving the accuracy of detection of baseline and/or induced regional wall motion abnormalities. One of the assumptions is that the combination of reduced LV wall thickening and reduced myocardial velocities can be used to accurately diagnose regional myocardial dysfunction. In this article we will discuss several new techniques for the quantification of regional LV function using Doppler echocardiography.
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Ueda K, Murata K, Tanaka N, Tone T, Wada Y, Kimura K, Fujino T, Jinyao L, Matsuzaki M. Ultrasonic myocardial tissue characterization in patients with hypertrophic cardiomyopathy and pressure-overloaded hypertrophy by backscattered energy temporal analysis. Circ J 2002; 66:729-34. [PMID: 12197596 DOI: 10.1253/circj.66.729] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
This study measured integrated backscatter (IB) values in the subendocardium and subepicardium of patients with hypertrophy using the newly developed Backscattered Energy Temporal Analysis (BETA) system, and evaluated the differences of acoustic properties according to etiology. Twenty-one patients with hypertrophic cardiomyopathy (HCM), 16 with pressure-overloaded hypertrophy (POH), and 21 controls were studied. M-mode formatted IB images were obtained using BETA and the region of interest (ROI), automatically divided into epicardial and endocardial halves of the myocardium, was placed in the ventricular septum and posterior wall. Values for the cyclic variation of IB (CVIB) in the entire ROI and in each half of the ROI were obtained. CVIB significantly decreased in the ventricular septum in HCM and POH compared with normal subjects, but there were no significant differences between HCM and POH. In the posterior wall, the CVIB was less in the subendocardium than in the epicardium in POH, and was also less than in normal subjects (7.0+/-1.7 dB vs 8.6+/-1.9 dB and 8.8+/-2.1 dB, p<0.05, respectively). Separate ultrasonic tissue characterization of the subendocardium and subepicardium provides further etiological information of various heart diseases.
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Affiliation(s)
- Kayo Ueda
- Division of Cardiovascular Medicine, Yamaguchi University School of Medicine, Ube City, Japan
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