A review of current trends in three-dimensional analysis of left ventricular myocardial strain
Cardiovascular Ultrasound volume 18, Article number: 23 (2020)
Three-dimensional (3D) left ventricular (LV) myocardial strain measurements using transthoracic 3D echocardiography speckle tracking analysis have several advantages over two-dimensional (2D) LV strain measurements, because 3D strain values are derived from the entire LV myocardium, yielding more accurate estimates of global and regional LV function. In this review article, we summarize the current status of 3D LV myocardial strain. Specifically, we describe how 3D LV strain analysis is performed. Next, we compare characteristics of 2D and 3D strain, and we explain validation of 3D strain measurements, feasibility and measurement differences between 2D and 3D strain, reference values of 3D strain, and its applications in several clinical scenarios. In some parts of this review, we used a meta-analysis to draw reliable conclusions. We also describe the added value of 3D over 2D strain in several specific pathologies and prognoses. Finally, we discuss novel techniques using 3D strain and suggest its future directions.
During the last two decades, two-dimensional (2D) myocardial strain measurements from 2D echocardiography (2DE) speckle tracking analysis have become an established technique for quantifying left and right heart chamber function. Their usefulness has been validated to 1) detect subtle heart chamber dysfunction [1,2,3], 2) evaluate the extent and severity of heart disease [1,2,3], and 3) predict future outcomes in various cardiovascular pathologies . All ultrasound vendors now have their own proprietary 2DE speckle tracking analytical software for the left ventricle, and some vendors have launched fully automated 2D strain analytical software employing artificial intelligence. Since the left ventricular (LV) myocardium consists of three different myocardial layers that contract in different directions simultaneously, accurate assessment requires three-dimensional (3D) analysis. Three-dimensional echocardiography (3DE) datasets with 3D speckle tracking analytical software have made it possible to perform clinical 3D strain analysis during the last decade [3,4,5]. 3D strain software offered by most ultrasound companies is designed to measure LV myocardial strain; thus, this review manuscript focuses only on 3D LV strain. For simplicity, strain values in each direction are presented as absolute values in the text, figures, and tables.
3D strain analysis
3D strain analysis starts by generating a region of interest (ROI), followed by segmentation of the left ventricle into a 16- or 17-segment model. The size of the ROI differs among 3D strain analytical software packages (LV subendocardial myocardium or the entire LV myocardium). Moreover, some software uses a library of various LV shapes from a large volume of patient data, and selects an appropriate LV shape to generate an ROI in each case (artificial intelligence). While 2D speckle tracking analysis pursues areas that contain specific natural acoustic markers, frame by frame within the ROI (pattern matching), 3D speckle tracking analysis tracks cubes with specific 3D patterns of acoustic markers within the ROI (block matching) to calculate global and regional 3D strain components (Fig. 1). Since the endocardial border is tracked throughout the cardiac cycle, the software also provides time domain LV volume curves from which the LV ejection fraction (LVEF) is calculated. In addition to longitudinal strain, circumferential strain, and radial strain, 3D strain software provides new deformation parameters, such as area strain and principal strain (Figs. 1, 2, 3 and 4). Area strain is determined as the percentage decrease in the size of endocardial (or mid-myocardial) surface area, defined by vectors of longitudinal and circumferential deformation at end-systole from its original area at end-diastole . Principal strain represents the major direction and magnitude of the deformation in which no shear strain occurs. It reflects longitudinal, circumferential, and torsional deformation; therefore, it can represent dynamic 3D movements of the left ventricle .
It is important to note that each software system has its own proprietary tracking algorithm, with different analytical approaches. Although strain values should be 0 at the start and end of the cardiac cycle, this does not always happen in regional speckle tracking analysis. Some software rejects regional strain values if drift exceeds a certain level, but other vendors use drift compensation to force strain values to 0 at the end of the cardiac cycle. Radial strain is calculated as a change in transmural wall thickness during a cardiac cycle. Since the myocardium is incompressible, some vendors estimate radial strain from segmental area changes, assuming volume conservation . Strain values may be represented as end-systolic strain or peak strain. These differences result in inter-vendor variability of 3D strain values that are significant, even when 3DE images are acquired from the same subjects .
Characteristics of 2D and 3D strain
2D strain requires acquisition of multiple 2DE images, including three short-axis views to measure global circumferential strain (GCS) and global radial strain (GRS), and three apical views to measure global longitudinal strain (GLS), resulting in longer data acquisition times. For analysis of all strain components by 2DE, adequate quality of both parasternal and apical images is necessary. However, temporal and spatial resolution are higher, and feasibility is usually high. There have been several validation studies, and normal 2D global strain values have been reported from various large-scale studies [9,10,11,12]. Since 2D strain analysis is performed on a fixed 2DE cutting plane, some speckles or features may be lost in the 2DE imaging plane during a cardiac cycle, due to out-of-plane or twisting motion of the left ventricle .
In contrast, only a single apical acquisition is required for 3D strain analysis, resulting in shorter acquisition times and the opportunity to measure all 3D strain components from a single cardiac cycle. 3D strain measurements are not impacted by out-of-plane and twisting motion. However, 3D strain suffers from lower temporal and spatial resolution, which adversely affects tracking reliability. Multi-beat acquisition sometimes produces a stitching artifact between sub-volumes, which results in inaccurate speckle tracking analysis.
Validation of 3D strain
Reliability and accuracy of 3D strain measurements have been validated in several studies (Table 1) [14,15,16,17,18]. First, the accuracy of regional longitudinal, circumferential, and radial strain measurements was determined in experimental studies under different loading conditions, using sonomicrometry data as a reference . There is good agreement between 3D regional strain measurements and corresponding values acquired using sonomicrometry. The best results have been observed in circumferential strain. The same authors subsequently reported that endocardial area strain correlated strongly with sonomicrometry data . Area strain values differed significantly with baseline, pharmacologic stress, and acute ischemia, whereas there were no differences in longitudinal and circumferential strains at baseline or with propranolol infusion or dobutamine infusion, indicating that area strain is a more sensitive parameter than longitudinal or circumferential strain for detecting subtle changes in LV deformation. Other authors applied 3D strain analysis in humans to validate its accuracy. However, it is important to note that there is no true “gold standard” for 3D myocardial mechanics . Instead they employed surrogates, such as cardiac magnetic resonance myocardial tagging , feature tracking , or 2DE/3DE-derived LVEF .
Feasibility of 3D strain
The main impediment to acceptance of 3D strain is the lack of proof that it is truly superior to 2D strain for clinical use, beyond its theoretical advantages, resulting in its use mainly for research. A recent European Association of Cardiovascular Imaging (EACVI) survey from 96 echo laboratories in 22 European countries revealed that only 32% of European laboratories routinely use transthoracic 3DE, mainly due to limitations in image quality and operator dependency . We performed a meta-analysis concerning the feasibility of 2D and 3D GLS in studies with sample sizes > 100 patients [21,22,23,24,25,26,27,28,29]. Feasibility of 3D GLS was 85% (95% confidence interval (CI): 79 to 89%). Corresponding values of 2D GLS were 91% (95% CI: 88 to 93%). If we compared feasibility of 3D GLS among different ethnicities, values were 91% (95% CI: 84 to 95%) in Asians, 81% (95% CI: 71 to 88%) in Europeans, and 73% (95% CI: 65 to 80%) in American patients. These results showed that feasibility of 3D GLS is lower than that of 2D GLS, and that feasibility is better in Asian patients than in American or European patients. However, there could be a selection bias, since some studies only selected patients with adequate 2DE image quality [23,24,25], and patients with poor 2DE image quality (the authors did not mention the number of these patients in the manuscripts) were excluded before strain analysis. Thus, actual feasibility of 2D/3D strain in consecutive series of patients could be much lower than the observed results. All published studies came from echocardiographic laboratories where physicians and sonographers were thoroughly familiar with 3DE data acquisition and analysis. Thus, the results may not be generally applicable.
Direct comparisons of 2D and 3D strain values
We performed a meta-analysis to compare global 2D and 3D strain values using the same ultrasound vendor’s 2D and 3D strain software. We selected only publications in which 2D GCS/GRS were measured using three short-axis views, and 2D GLS was measured with three apical views. We found 3846 paired comparisons of GLS between 2DE and 3DE in 36 publications using one of the three vendors (GE Healthcare, TomTec Imaging Systems, Toshiba Medical Systems) [13, 17, 18, 21,22,23, 25,26,27,28, 30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55]. The mean value of 3D GLS was significantly lower than that of 2D GLS, with a mean bias of 1.4% (Fig. 5). The pooled mean value of 3D GLS for GE and Toshiba was significantly lower than that of 2D GLS. However, there were no significant differences when using TomTec software. Regarding GCS, there were no statistically significant differences between 3D GCS and 2D GCS in 1894 paired comparisons [13, 18, 23, 25, 26, 30, 35,36,37, 40,41,42,43, 48, 50, 56]. Vendor analysis showed that 3D GCS was significantly smaller than 2D GCS when GE analytical software was used, but 3D GCS was significantly larger than 2D GCS when we used Toshiba or TomTec software. Finally, there were no significant differences between 3D GRS and 2D GRS in 1778 paired comparisons from 14 studies [18, 23, 25, 26, 30, 36, 37, 40,41,42,43, 48, 56, 57]. Although software from all three vendors yielded no differences in GRS between the two techniques, results in each publication showed different trends, such that 2D GRS was larger than 3D GRS in some studies [25, 26, 42, 43] and 2D GRS was smaller than 3D GRS in others [23, 36, 37, 41, 56]. These results showed that differences in global strain between 2DE and 3DE vary according to the ultrasound vendor. Thus, 2D and 3D strain are not interchangeable, and we need vendor-dependent reference values of 3D strain.
Reference values for 3D GLS
Truong et al.  recently performed meta-analysis to determine normal ranges of LV 3D GLS, 3D GCS, 3D GRS, and 3D GAS in 2346 subjects from 32 studies. The authors reported that the mean value of 3D GLS was 19.1%, ranging from 15.8 to 23.4% among the studies. However, the majority of selected studies had small sample sizes (n = 20–50), and the authors were forced to exclude one large study because median and interquartile range were presented in the manuscript, rather than means ± standard deviations . When we searched publications in which at least 100 healthy subjects were evaluated, there were seven independent datasets from six publications (Table 2) [59,60,61,62,63,64]. Overall, the mean value of 3D GLS was 18.1% (95% CI: 16.1 to 20.1%). Mean values of 3D GLS ranged from 15.2 to 21.0% among the studies, and if we defined the lower limit of normal (LLN) as the mean – 1.96SD, LLN ranged from 11.1 to 15.9%. The mean value of 3D GLS in male subjects (n = 696) was 18.4% (95% CI: 16.5 to 20.3%) in four studies that addressed gender-based strain analysis [59, 60, 62, 63]. The corresponding value in female subjects (n = 818) was 19.8% (95% CI: 17.7 to 21.8%). It is interesting that 3D GLS in female subjects was consistently and significantly higher than in male subjects, irrespective of the software used for the analysis, with a mean bias of 1.3% (95% CI: 0.9 to 1.7%). This finding suggests the need for establishment of gender-dependent reference values. Finally, as in a previous 2D GLS study , there were inter-vendor differences in 3D GLS reference values. The lowest values were observed when Toshiba software (15.4 ± 1.4%, n = 634) was used, followed by GE software (18.7 ± 2.6%, n = 265). The highest values were obtained with TomTec software (20.6 ± 3.0%, n = 946). This is partly because ultrasound vendors use different ROIs for speckle tracking (both TomTec and Toshiba software use subendocardial tracking , but GE software uses full myocardial tracking). Different 3D dataset characteristics in each vendor is another cause of discrepancy . The World Alliance Societies of Echocardiography Normal Values Study plans to address whether racial differences in 3D strain are observed .
Clinical applications of 3D strain
Since clinical applications of 3D strain are still limited, we focus here on its usefulness in several clinical scenarios.
Ischemic heart disease
Even in patients who had received successful primary percutaneous coronary intervention after acute myocardial infarction, when LV adverse remodeling occurs, it is associated with poor outcomes; thus, for reliable, accurate assessment, it is of paramount importance to stratify high risk patients after the intervention. Infarct size negatively affects LV function; thus, it is a major determinant of LV adverse remodeling. 2D and 3D deformation parameters, which reflect regional and global LV function, may reliably evaluate infarct size and transmural extent of myocardial infarction. Several studies have demonstrated the clinical usefulness of 3D strain analysis in patients with acute or recent myocardial infarction, who underwent primary percutaneous coronary intervention [28, 31, 34, 50, 66,67,68,69,70]. Some studies addressed the utility of 3D strain for predicting LV adverse remodeling (defined as an increase in LV end-diastolic volume ≥ 15% or 20%) or LV functional recovery (defined as an improvement ≥5% of LVEF) during the chronic phase (Table 3) [28, 31, 34, 50, 66,67,68,69]. 3D global strain analysis was possible in > 80% of study subjects. All studies revealed that 3D global strain, especially 3D GLS and 3D GAS, predict LV adverse remodeling with moderate accuracy (57 to 75%). Only one study compared predictive values of 2D and 3D global strain. It showed that 3D GLS was a significantly better predictor of LV adverse remodeling than 2D GLS, 3D GAS, or 3D GRS .
Since endocardial fibers are oriented longitudinally, and mid-myocardial fibers run circumferentially, preferential reduction of longitudinal strain and preserved circumferential strain could reflect the presence of subendocardial myocardial infarction, and reduction of both longitudinal and circumferential strains may represent transmural myocardial infarction. Other studies investigated the diagnostic value of 3D strain measurements for evaluating the transmurality of infarction, which was verified using cardiac magnetic resonance with late gadolinium enhancement (LGE) (subendocardial infarction, 0% to ≤50%; transmural infarction, > 50% of the transmural extent of LGE) [31, 34, 50, 68, 69]. In contrast to the aforementioned theory, all 3D regional strain measurements differed significantly among segments with no myocardial infarction, segments with non-transmural infarction, and segments with transmural infarction. In addition, none of the studies unequivocally demonstrated that 3D regional strain is superior to 2D regional strain for evaluating transmurality of myocardial infarction.
The potential utility of 3D strain to determine myocardial infarct size has been also reported [31, 34, 68, 69]. Overall, there were modest correlations between 3D GLS/ 3D GCS and infarct size assessed by LGE using cardiac magnetic resonance imaging. A meta-analysis revealed that the r value for the correlation between 3D GLS and the percentage of myocardial infarction size in four studies [31, 34, 68, 69] was only 0.55 (95% CI: 0.19 to 0.78) with notable heterogeneity . Pooled r values further decreased to 0.38 (95% CI: 0.22 to 0.54) when one study that was a potential cause of heterogeneity was excluded from the analysis.
These results suggest that 3D global strain analysis may be useful to predict LV adverse remodeling. However, their diagnostic accuracy is modest at best. 3D regional strain measurement is not sufficiently sensitive to discriminate between subendocardial infarction and transmural infarction. 3D global strain values are not useful to determine infarct size. There are also no consistent findings to suggest that 3D strain is more useful than 2D strain. Further large-scale studies are required to determine whether 3D strain has some added value over 2D strain for evaluating patients with myocardial infarction after coronary intervention.
As the development of tumor-targeted anticancer drugs allows cancer patients to live longer, cancer therapy-related cardiac dysfunction and/or heart failure is becoming a major issue . Although cardiac dysfunction in patients undergoing cancer treatment is complex with respect to treatment regimen, cardiotoxic anticancer drugs, age, and comorbidities, detection of subclinical myocardial dysfunction facilitates timely intervention and reduces the risk of adverse outcomes. 2D strain has proven useful to detect subclinical LV dysfunction in cancer patients . Several studies have attempted to determine the clinical usefulness of 3D strain in cancer patients who had been treated with cardiotoxic anticancer drugs [27, 40, 54, 73,74,75,76]. All but one study showed a significant reduction of 3D global strain during and after cardiotoxic anticancer drugs, compared with baseline (Table 4). A significant reduction of 3D global strain was already observed at a timepoint when 2D LVEF and/or 2D global strains were still normal in some studies [73, 74]. Another study revealed that 3D LVEF and 3D global strains were associated with concurrent and subsequent changes in 2D LVEF . However, there were no consistent findings that a specific 3D strain component is most robust for detecting subtle LV dysfunction. There were also very few articles that validated added value of 3D strain over 2D strain for predicting LV dysfunction . Thus, 3D strain can predict subclinical LV dysfunction, but data were insufficient to conclude whether 3D strain is better than 2D strain.
Acquisition of good-quality echocardiographic images is a potential concern in breast cancer patients because patients often receive mastectomies and radiation therapy of the chest. A meta-analysis from seven studies (Table 4) revealed that feasibility of 3D strain measurements before and after treatment were 93% (95% CI: 85 to 97%) and 92% (95% CI:80 to 97%), respectively. However, it is worth noting that patients with bad image quality were excluded in some studies [40, 54]. In this regard, the results from Santoro and colleagues may represent the current feasibility of 2D/3D strain measurements in prospectively enrolled breast cancer patients . This study also showed that 2D GLS was better than 3D global strain for evaluating treatment course in breast cancer patients due to high feasibility and reasonable detection of subclinical LV dysfunction.
Only two studies investigated the prognostic value of 3D global strain to predict cancer therapy-related cardiac dysfunction and/or heart failure with moderate accuracy (70 and 73%) [54, 73]. Thus, further studies are required to verify whether 3D strain is better than 2D strain to predict outcomes. It is also necessary to investigate whether patient management guided by 3D LVEF and/or 3D strain is better than that guided by 2D LVEF and/or 2D strain to prevent heart failure in cancer patients.
Subclinical LV dysfunction
LV longitudinal functional impairment in patients with preserved LVEF is the first component that has been demonstrated using 2D strain analysis [1, 2]. 3D strain analysis has been performed to verify this concept in asymptomatic patients with normal LVEF who had comorbidities (hypertension, diabetes or collagen disease) [6, 36, 37, 44, 49, 52, 56, 77]. Pooled analysis revealed that both 2D and 3D GLS in patients were consistently and significantly depressed compared with control subjects (Supplementary Figure 1). Thus, both 2D and 3D strain can detect subclinical LV dysfunction.
Left ventricular hypertrophy
LV hypertrophy (LVH) has been associated with increased cardiovascular death and all causes of death, independent of traditional risk factors . The potential usefulness of 3D strain in patients with LVH is summarized in Table 5 [39, 47, 53, 79,80,81,82,83]. In patients with hypertension, Tadic et al. demonstrated that 2D and 3D global strain values differed among five types of LV geometry showing that the worst LV deformation parameters were observed in concentric LVH and dilated LVH, even after adjusting anthropometric and hemodynamic parameters .
Both 3D GLS and GAS were consistently impaired irrespective of the severity of LVH, but 3D GCS was preserved or even enhanced in patients with hypertrophic cardiomyopathy [53, 80, 82]. These results indicate that preservation of 3D GCS may be a compensatory mechanism for maintaining LVEF.
3D strains are also reportedly impaired in patients with cardiac amyloidosis [79, 83]. Regional assessment of strain values has been reported in only one study . Compared to hypertrophic cardiomyopathy, basal radial strain was remarkably reduced, but apical radial strain was preserved in patients with cardiac amyloidosis, and the findings were compatible to the apical sparing pattern observed using 2D longitudinal strain  (Fig. 6). Finally, there are still not enough data to validate whether 3D strain has added value over 2D strain in patients with LVH.
Valvular heart disease
3D strain has been assessed in patients with valvular heart disease [26, 41, 47, 85,86,87,88]. Several authors analyzed 3D strain before and after transcatheter aortic valve replacement (TAVR) or MitraClip [41, 85, 87]. 2D and 3D GLS were significantly improved 6 months after TAVR in patients with severe aortic stenosis, and this beneficial trend was more obvious in patients whose baseline LVEF was more impaired, which reflects the presence of afterload mismatch . All 3D global strains except 3D GRS were improved significantly 6 months after the MitraClip in patients with more than moderate mitral regurgitation . The authors also noted that right ventricular dysfunction at baseline was associated with poor improvement of 3D global strains. The other study showed that 3D LV volumes, LVEF, and 2D GLS were not improved, but 3D GLS was improved 1 month after the MitraClip . An impairment of 3D GLS with compensated augmentation of 3D GCS has been reported in asymptomatic patients with moderate or severe aortic regurgitation . This compensating circumferential function could result in normal LVEF, a finding also reported in patients with hypertrophic cardiomyopathy [53, 80, 82].
Cardiac resynchronization therapy
Although echocardiographic assessment of LV mechanical dyssynchrony was expected to assist selection of optimal candidates for cardiac resynchronization therapy (CRT), because of the negative outcome of the PROSPECT trial, echocardiography was not recommended by current guidelines . Several investigators have used 3D strain to evaluate LV dyssynchrony to predict CRT responders [90,91,92,93,94]. The authors measured time from onset of the QRS complex to peak strain, and determined the earliest and latest activation sites or created a new dyssynchrony index. However, it should be noted that time to peak strain does not reflect time to onset of mechanical contraction.
Seo et al. developed an activation imaging system using 3D area strain analysis which sought to quantify time from the QRS complex to the onset of regional deformation, and its reliability and accuracy has been validated against 3D voltage-mapping systems . Activation imaging allows detection of the earliest activation site, subsequent propagation sequence, and latest activation. The same authors also demonstrated that the presence of a U-shaped propagation pattern, which was characterized as activation propagated from the mid septum, followed by the apex to the lateral or posterior wall, had a sensitivity of 88% and a specificity of 95% for predicting CRT volume responder (≥15% reduction of LV end-systolic volume at 6 months after CRT)  (Fig. 7). A U-shaped propagation pattern was also associated with good outcomes after adjusting left bundle branch block or LV end-diastolic volume. Thus, activation imaging with 3D speckle tracking analysis has potential to visualize propagation of LV regional activation and to provide additional value for predicting outcomes in patients who are referred for CRT.
Several studies investigated the prognostic value of 3D strain in myocardial infarction, hemodialysis, valvular heart disease, and a diverse variety of subjects [24, 26, 48, 86, 97,98,99,100] (Table 6). These studies all showed that 3D global strains were impaired in patients who had cardiac events, and reduction of 3D global strains was associated with poor outcomes. Reduction of 2D and 3D strains was attributed to myocardial fibrosis or inflammation . Three of eight studies directly compared prognostic values between 2D GLS and 3D GLS, and all three studies showed that 3D GLS had superior prognostic value over 2D GLS [26, 99, 100]. Further studies are needed to validate whether 3D GLS is distinctly superior to 2D GLS for predicting future outcomes in specific cardiovascular pathologies.
Multimodality imaging allows fusion imaging [102,103,104]. Mor-Avi and colleagues performed fusion imaging using computed tomography coronary angiography (CTCA) and 3D longitudinal strain [103, 104]. Resting 3D regional longitudinal strain was color-coded to detect regional abnormalities in a 3D map. Stress CT perfusion was also color-coded to detect regional perfusion abnormalities. Fractional flow reserve (FFR) was also measured using CTCA. The presence of resting strain abnormalities had 71% sensitivity and 81% specificity for detecting > 50% stenosis in CTCA and stress-induced myocardial perfusion defects within specific coronary vascular beds. It had a sensitivity of 83% and a specificity of 81% for detecting stress-induced myocardial perfusion and FFR < 0.80. These results suggest that fusion imaging with 3D strain and CTCA provide valuable information to detect functionally significant coronary stenosis, even at rest. Additional large-scale studies are required to validate whether 3D regional longitudinal strain abnormalities at rest reflect solely reductions of coronary blood flow due to functionally significant coronary stenosis.
Like the 2D strain standardization taskforce [105,106,107,108], the American Society of Echocardiography/ EACVI and instrument partners should work together to identify causes of inter-vendor variability of 3D strain measurements with the objective of reducing it. Current 3D LV strain analysis is predominantly performed to evaluate global LV function. Segmental 3D strain abnormalities may represent specific pathologies. However, accurate 3D segmental tracking requires clearer 3D images with fine spatial resolution and high temporal resolution. Although one-beat acquisition of 3DE full-volume datasets using smaller 3DE transducers is now possible, spatial and temporal resolution are still not adequate to perform reliable segmental deformation analysis. This limitation also causes some underestimation of 3D global strain values, compared with corresponding 2D global strain values. Non-segmental (e.g., coronary artery territories) analysis of deformation is one solution to overcome current problems for segmental analysis . Myocardial curvature analysis or LV shape analysis is another fruitful field of research, because it will provide useful information regarding disease severity and prognosis . Since 3D strain simultaneously provides multidirectional strains, extraction of shear strain components which combine deformation in two different directions is also an interesting field for research [7, 110]. 3DE could be more useful than 2DE in complex and irregular heart chambers, like the right ventricle. 3D strain software aimed at other cardiac chambers is just starting and is now commercially available. It will soon be determined whether 3D RV global strains are more robust parameters than 3D RVEF to predict future outcomes, and whether 3D RV global strains detect subtle RV dysfunction in patients whose 3D RVEF is still normal. Finally, fully automated 3D strain analytical software will eliminate observer variability of 3D strain measurements, and will facilitate the use of 3D strain for routine adoption in the clinical arena.
3D LV speckle tracking software simultaneously provides LV volumes, LVEF, and 3D global strains with multiple directions. It also provides a new 3D deformation parameter, such as area strain, which is an integral marker of longitudinal and circumferential function. However, 3DE data acquisition and subsequent strain analysis have not been widely adopted, and their evaluation is still limited to research applications. There are no consistent findings to suggest that 3D LV strain is superior to 2D LV strain in some clinical scenarios. In addition to facilitating further refinements of both 3DE image quality and 3D LV strain software, application of fully-automated 3D strain software may expand its adoption into routine echocardiography examinations.
Availability of data and materials
The datasets used and analyzed during current study are available from the corresponding author on reasonable request.
Cardiac resynchronization therapy
Computed tomography coronary angiography
European Association of Cardiovascular Imaging
Fractional flow reserve
Global area strain
Global circumferential strain
Global longitudinal strain
Global radial strain
Lower limit normal
Late gadolinium enhancement
Left ventricular ejection fraction
Left ventricular hypertrophy
Region of interest
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We thank Dr. Tetsuji Kitano for contributing data collection.
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Forest plots of the mean difference in 2D GLS between patients with subclinical left ventricular dysfunction and control subjects (A), and corresponding 3D GLS values between the two groups (B) Each study shows first author’s last name, year of publication, and the reference number (parenthesis). CI, confidence interval; MD, mean difference; SD, standard deviation.
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Nabeshima, Y., Seo, Y. & Takeuchi, M. A review of current trends in three-dimensional analysis of left ventricular myocardial strain. Cardiovasc Ultrasound 18, 23 (2020). https://doi.org/10.1186/s12947-020-00204-3