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        "titulo" => "Ecocardiografia tridimensional de <span class="elsevierStyleItalic">speckle tracking</span>&#58; o futuro &#233; agora"
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    "textoCompleto" => "<span class="elsevierStyleSections"><p id="par0005" class="elsevierStylePara elsevierViewall">Cardiac ultrasound is an imaging modality that enables dynamic imaging of the heart and great vessels&#46; The past decade has seen the development of two-dimensional speckle tracking echocardiography &#40;2D-STE&#41;&#44; a semi-automated technique based on frame-by-frame tracking of tiny echo-dense speckles within the myocardium that reveals the extent of lengthening and shortening relative to the baseline &#40;Lagrangian strain&#41;&#46;<a class="elsevierStyleCrossRef" href="#bib0095"><span class="elsevierStyleSup">1</span></a> It enables assessment of motion and deformation parameters such as velocity&#44; displacement&#44; strain&#44; and strain rate in the left ventricular longitudinal&#44; radial&#44; or circumferential axis&#46;<a class="elsevierStyleCrossRef" href="#bib0095"><span class="elsevierStyleSup">1</span></a> This non-Doppler methodology is therefore able to provide information on segmental and global myocardial deformation&#46; Myocardial 2D-STE has been validated by comparison with sonomicrometry<a class="elsevierStyleCrossRef" href="#bib0100"><span class="elsevierStyleSup">2</span></a> and tagged magnetic resonance imaging &#40;MRI&#41;&#46;<a class="elsevierStyleCrossRef" href="#bib0105"><span class="elsevierStyleSup">3</span></a></p><p id="par0010" class="elsevierStylePara elsevierViewall">With respect to left ventricular &#40;LV&#41; mechanics&#44; global longitudinal strain &#40;GLS&#41; is the most-studied 2D-STE parameter and is part of routine assessment in many echocardiographic laboratories&#46; This is in contrast to analysis of radial and circumferential LV mechanics&#44; which are probably not sufficiently reproducible&#46;<a class="elsevierStyleCrossRef" href="#bib0110"><span class="elsevierStyleSup">4</span></a> By convention&#44; GLS is presented as negative values representing shortening in the longitudinal LV axis&#46; In a meta-analysis of 24 studies which included 2597 healthy subjects&#44; GLS varied from -15&#46;9&#37; to -22&#46;1&#37;&#46;<a class="elsevierStyleCrossRef" href="#bib0115"><span class="elsevierStyleSup">5</span></a> The American Society of Echocardiography suggests a value above -20&#37; with a standard deviation of &#177;2&#37; as likely to be normal&#46;<a class="elsevierStyleCrossRef" href="#bib0120"><span class="elsevierStyleSup">6</span></a></p><p id="par0015" class="elsevierStylePara elsevierViewall">To date&#44; most strain data have come from non-randomized&#44; retrospective studies&#46; GLS has been proposed for the detection of myocardial ischemia&#44;<a class="elsevierStyleCrossRef" href="#bib0125"><span class="elsevierStyleSup">7</span></a> to differentiate among various hypertrophy etiologies&#44;<a class="elsevierStyleCrossRef" href="#bib0130"><span class="elsevierStyleSup">8</span></a> to monitor therapy&#44; and as a tool to detect heart disease in the preclinical stage&#46;<a class="elsevierStyleCrossRef" href="#bib0135"><span class="elsevierStyleSup">9</span></a> A recent 2017 review identifies four settings in which GLS can provide additional &#40;if not potentially incremental&#41; clinical utility&#58; undifferentiated left ventricular hypertrophy&#59; assessment of cardiotoxicity&#59; aortic stenosis&#59; and ischemic heart disease&#46;<a class="elsevierStyleCrossRef" href="#bib0110"><span class="elsevierStyleSup">4</span></a></p><p id="par0020" class="elsevierStylePara elsevierViewall">The use of 2D-ST has been expanded and validated for the other cardiac chambers &#40;right ventricle and left and right atrium&#41;<a class="elsevierStyleCrossRef" href="#bib0095"><span class="elsevierStyleSup">1</span></a> as well as the aortic wall&#46;<a class="elsevierStyleCrossRef" href="#bib0140"><span class="elsevierStyleSup">10</span></a></p><p id="par0025" class="elsevierStylePara elsevierViewall">Ultrasound systems are now capable of acquiring real-time volumetric LV data&#46; Three-dimensional &#40;3D&#41; techniques can measure all strain components in all LV segments and LV torsion from a single acquisition&#46;<a class="elsevierStyleCrossRef" href="#bib0145"><span class="elsevierStyleSup">11</span></a> 3D speckle tracking echocardiography &#40;3D-STE&#41; thus offers an opportunity to overcome a significant limitation of 2D-STE&#58; out-of-plane speckle motion&#46;<a class="elsevierStyleCrossRef" href="#bib0110"><span class="elsevierStyleSup">4</span></a></p><p id="par0030" class="elsevierStylePara elsevierViewall">Nevertheless&#44; tracking in three dimensions is challenging&#44; as both the spatial and the temporal resolution of the 3D data set are inferior to 2D imaging&#44; and there is the possibility of speckle decorrelation between subsequent volumes&#46;<a class="elsevierStyleCrossRefs" href="#bib0150"><span class="elsevierStyleSup">12&#44;13</span></a> Even so&#44; 3D-STE has been validated in simulated models&#44; in vitro and in vivo&#44; against sonomicrometry and MRI markers&#46;<a class="elsevierStyleCrossRef" href="#bib0145"><span class="elsevierStyleSup">11</span></a> LV 3D-STE has been shown to be a reliable technique for the assessment of LV global systolic function&#44; highly correlated with left ventricular ejection fraction and Doppler-derived cardiac output&#46;<a class="elsevierStyleCrossRef" href="#bib0160"><span class="elsevierStyleSup">14</span></a> Subsequent studies in different clinical scenarios such as ischemia and hypertensive and valvular heart disease have provided further evidence of the utility of LV 3D-STE&#46;<a class="elsevierStyleCrossRef" href="#bib0145"><span class="elsevierStyleSup">11</span></a></p><p id="par0035" class="elsevierStylePara elsevierViewall">In this issue of the <span class="elsevierStyleItalic">Journal</span>&#44; Guedes et al&#46;&#44;<a class="elsevierStyleCrossRef" href="#bib0165"><span class="elsevierStyleSup">15</span></a> using both classic and advanced echocardiographic parameters&#44; present a study of a group of patients with myotonic dystrophy type 1 &#40;DM1&#41; with no established cardiovascular disease plus a control group of healthy subjects&#46; Regarding advanced imaging&#44; the authors focused on 3D LV myocardial mechanics assessed with an Artida scanner &#40;Toshiba<span class="elsevierStyleSup">&#174;</span> Medical Systems&#41;&#46; The following parameters of LV cardiac mechanics were calculated&#58; LV longitudinal&#44; radial and circumferential strain&#59; LV area tracking&#59; and twist&#46; The authors concluded that DM1 patients had lower values of 3D LV longitudinal strain than the control group&#46; Moreover&#44; assessment of 2D myocardial mechanics did not identify differences between the groups&#44; in contrast to 3D assessment&#46; Based on previous data from clinical studies&#44;<a class="elsevierStyleCrossRef" href="#bib0170"><span class="elsevierStyleSup">16</span></a> 2D-STE<a class="elsevierStyleCrossRef" href="#bib0175"><span class="elsevierStyleSup">17</span></a> and cardiac MRI of myocardial fibrosis<a class="elsevierStyleCrossRef" href="#bib0180"><span class="elsevierStyleSup">18</span></a> in DM1 patients&#44; the authors theorized that this 3D LV longitudinal strain reduction could represent subclinical myocardial damage&#46;</p><p id="par0040" class="elsevierStylePara elsevierViewall">Although these results are of interest&#44; some limitations are to be noted&#46; Speckle-tracking analyses can be complex and time-consuming&#44; and can generally only be obtained from high-quality images&#46; It is therefore important to provide data regarding feasibility&#46; Secondly&#44; inter- and intra-observer variability in assessment of cardiac mechanics &#40;and echocardiography in general&#41; is a concern&#46; The intra-class correlation coefficient can be used&#44; but&#44; for simplicity&#44; other measures of variability may be more appropriate&#44; such as the absolute difference divided by the mean of repeated observations&#44; expressed as a percentage&#46; Finally&#44; the overlap of values between cases and controls makes it unlikely that 3D-STE will in fact add real value in clinical practice&#46;</p><span id="sec0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0005">Conflicts of interest</span><p id="par0045" class="elsevierStylePara elsevierViewall">The author has no conflicts of interest to declare&#46;</p></span></span>"
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Editorial comment
Three-dimensional speckle tracking echocardiography: The future is now
Ecocardiografia tridimensional de speckle tracking: o futuro é agora
Rogério Teixeiraa,b
a Cardiology Department, Hospital Geral, Centro Hospitalar e Universitário de Coimbra, Portugal
b Faculty of Medicine, University of Coimbra, Coimbra, Portugal
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    "titulo" => "Three-dimensional speckle tracking echocardiography&#58; The future is now"
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    "textoCompleto" => "<span class="elsevierStyleSections"><p id="par0005" class="elsevierStylePara elsevierViewall">Cardiac ultrasound is an imaging modality that enables dynamic imaging of the heart and great vessels&#46; The past decade has seen the development of two-dimensional speckle tracking echocardiography &#40;2D-STE&#41;&#44; a semi-automated technique based on frame-by-frame tracking of tiny echo-dense speckles within the myocardium that reveals the extent of lengthening and shortening relative to the baseline &#40;Lagrangian strain&#41;&#46;<a class="elsevierStyleCrossRef" href="#bib0095"><span class="elsevierStyleSup">1</span></a> It enables assessment of motion and deformation parameters such as velocity&#44; displacement&#44; strain&#44; and strain rate in the left ventricular longitudinal&#44; radial&#44; or circumferential axis&#46;<a class="elsevierStyleCrossRef" href="#bib0095"><span class="elsevierStyleSup">1</span></a> This non-Doppler methodology is therefore able to provide information on segmental and global myocardial deformation&#46; Myocardial 2D-STE has been validated by comparison with sonomicrometry<a class="elsevierStyleCrossRef" href="#bib0100"><span class="elsevierStyleSup">2</span></a> and tagged magnetic resonance imaging &#40;MRI&#41;&#46;<a class="elsevierStyleCrossRef" href="#bib0105"><span class="elsevierStyleSup">3</span></a></p><p id="par0010" class="elsevierStylePara elsevierViewall">With respect to left ventricular &#40;LV&#41; mechanics&#44; global longitudinal strain &#40;GLS&#41; is the most-studied 2D-STE parameter and is part of routine assessment in many echocardiographic laboratories&#46; This is in contrast to analysis of radial and circumferential LV mechanics&#44; which are probably not sufficiently reproducible&#46;<a class="elsevierStyleCrossRef" href="#bib0110"><span class="elsevierStyleSup">4</span></a> By convention&#44; GLS is presented as negative values representing shortening in the longitudinal LV axis&#46; In a meta-analysis of 24 studies which included 2597 healthy subjects&#44; GLS varied from -15&#46;9&#37; to -22&#46;1&#37;&#46;<a class="elsevierStyleCrossRef" href="#bib0115"><span class="elsevierStyleSup">5</span></a> The American Society of Echocardiography suggests a value above -20&#37; with a standard deviation of &#177;2&#37; as likely to be normal&#46;<a class="elsevierStyleCrossRef" href="#bib0120"><span class="elsevierStyleSup">6</span></a></p><p id="par0015" class="elsevierStylePara elsevierViewall">To date&#44; most strain data have come from non-randomized&#44; retrospective studies&#46; GLS has been proposed for the detection of myocardial ischemia&#44;<a class="elsevierStyleCrossRef" href="#bib0125"><span class="elsevierStyleSup">7</span></a> to differentiate among various hypertrophy etiologies&#44;<a class="elsevierStyleCrossRef" href="#bib0130"><span class="elsevierStyleSup">8</span></a> to monitor therapy&#44; and as a tool to detect heart disease in the preclinical stage&#46;<a class="elsevierStyleCrossRef" href="#bib0135"><span class="elsevierStyleSup">9</span></a> A recent 2017 review identifies four settings in which GLS can provide additional &#40;if not potentially incremental&#41; clinical utility&#58; undifferentiated left ventricular hypertrophy&#59; assessment of cardiotoxicity&#59; aortic stenosis&#59; and ischemic heart disease&#46;<a class="elsevierStyleCrossRef" href="#bib0110"><span class="elsevierStyleSup">4</span></a></p><p id="par0020" class="elsevierStylePara elsevierViewall">The use of 2D-ST has been expanded and validated for the other cardiac chambers &#40;right ventricle and left and right atrium&#41;<a class="elsevierStyleCrossRef" href="#bib0095"><span class="elsevierStyleSup">1</span></a> as well as the aortic wall&#46;<a class="elsevierStyleCrossRef" href="#bib0140"><span class="elsevierStyleSup">10</span></a></p><p id="par0025" class="elsevierStylePara elsevierViewall">Ultrasound systems are now capable of acquiring real-time volumetric LV data&#46; Three-dimensional &#40;3D&#41; techniques can measure all strain components in all LV segments and LV torsion from a single acquisition&#46;<a class="elsevierStyleCrossRef" href="#bib0145"><span class="elsevierStyleSup">11</span></a> 3D speckle tracking echocardiography &#40;3D-STE&#41; thus offers an opportunity to overcome a significant limitation of 2D-STE&#58; out-of-plane speckle motion&#46;<a class="elsevierStyleCrossRef" href="#bib0110"><span class="elsevierStyleSup">4</span></a></p><p id="par0030" class="elsevierStylePara elsevierViewall">Nevertheless&#44; tracking in three dimensions is challenging&#44; as both the spatial and the temporal resolution of the 3D data set are inferior to 2D imaging&#44; and there is the possibility of speckle decorrelation between subsequent volumes&#46;<a class="elsevierStyleCrossRefs" href="#bib0150"><span class="elsevierStyleSup">12&#44;13</span></a> Even so&#44; 3D-STE has been validated in simulated models&#44; in vitro and in vivo&#44; against sonomicrometry and MRI markers&#46;<a class="elsevierStyleCrossRef" href="#bib0145"><span class="elsevierStyleSup">11</span></a> LV 3D-STE has been shown to be a reliable technique for the assessment of LV global systolic function&#44; highly correlated with left ventricular ejection fraction and Doppler-derived cardiac output&#46;<a class="elsevierStyleCrossRef" href="#bib0160"><span class="elsevierStyleSup">14</span></a> Subsequent studies in different clinical scenarios such as ischemia and hypertensive and valvular heart disease have provided further evidence of the utility of LV 3D-STE&#46;<a class="elsevierStyleCrossRef" href="#bib0145"><span class="elsevierStyleSup">11</span></a></p><p id="par0035" class="elsevierStylePara elsevierViewall">In this issue of the <span class="elsevierStyleItalic">Journal</span>&#44; Guedes et al&#46;&#44;<a class="elsevierStyleCrossRef" href="#bib0165"><span class="elsevierStyleSup">15</span></a> using both classic and advanced echocardiographic parameters&#44; present a study of a group of patients with myotonic dystrophy type 1 &#40;DM1&#41; with no established cardiovascular disease plus a control group of healthy subjects&#46; Regarding advanced imaging&#44; the authors focused on 3D LV myocardial mechanics assessed with an Artida scanner &#40;Toshiba<span class="elsevierStyleSup">&#174;</span> Medical Systems&#41;&#46; The following parameters of LV cardiac mechanics were calculated&#58; LV longitudinal&#44; radial and circumferential strain&#59; LV area tracking&#59; and twist&#46; The authors concluded that DM1 patients had lower values of 3D LV longitudinal strain than the control group&#46; Moreover&#44; assessment of 2D myocardial mechanics did not identify differences between the groups&#44; in contrast to 3D assessment&#46; Based on previous data from clinical studies&#44;<a class="elsevierStyleCrossRef" href="#bib0170"><span class="elsevierStyleSup">16</span></a> 2D-STE<a class="elsevierStyleCrossRef" href="#bib0175"><span class="elsevierStyleSup">17</span></a> and cardiac MRI of myocardial fibrosis<a class="elsevierStyleCrossRef" href="#bib0180"><span class="elsevierStyleSup">18</span></a> in DM1 patients&#44; the authors theorized that this 3D LV longitudinal strain reduction could represent subclinical myocardial damage&#46;</p><p id="par0040" class="elsevierStylePara elsevierViewall">Although these results are of interest&#44; some limitations are to be noted&#46; Speckle-tracking analyses can be complex and time-consuming&#44; and can generally only be obtained from high-quality images&#46; It is therefore important to provide data regarding feasibility&#46; Secondly&#44; inter- and intra-observer variability in assessment of cardiac mechanics &#40;and echocardiography in general&#41; is a concern&#46; The intra-class correlation coefficient can be used&#44; but&#44; for simplicity&#44; other measures of variability may be more appropriate&#44; such as the absolute difference divided by the mean of repeated observations&#44; expressed as a percentage&#46; Finally&#44; the overlap of values between cases and controls makes it unlikely that 3D-STE will in fact add real value in clinical practice&#46;</p><span id="sec0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0005">Conflicts of interest</span><p id="par0045" class="elsevierStylePara elsevierViewall">The author has no conflicts of interest to declare&#46;</p></span></span>"
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