Clinical Investigation
Ventricular Mechanics: Strain and Twist
Comprehensive Evaluation of Left Ventricular Strain Using Speckle Tracking Echocardiography in Normal Adults: Comparison of Three-Dimensional and Two-Dimensional Approaches

https://doi.org/10.1016/j.echo.2009.05.021Get rights and content

Objective

The two-dimensional speckle tracking (2DT) method is based on the measurements of strain on two-dimensional (2D) images, ignoring actual three-dimensional (3D) myocardial movements. We sought to investigate the feasibility of the newly developed three-dimensional speckle tracking (3DT) method to assess longitudinal, circumferential, and radial strain values, and then compared the data with those measured by 2DT.

Methods

Echocardiographic examinations were performed in 46 volunteers. In the apical 3D volumetric images, 3 vectors of the strains were analyzed in 16 myocardial segments. 2D longitudinal strain was assessed in apical 4-, 3-, and 2-chamber views, and circumferential and radial strains were measured in parasternal short-axis view.

Results

The average time for 3D image acquisition and 3D strain analysis by 3DT was significantly shorter than for 2DT. Longitudinal strain value by 3DT was significantly smaller than by 2DT (−17.4% ± 5.0% vs −19.9% ± 6.7%, P < .0001), and circumferential strain value by 3DT was significantly larger than by 2DT (−30.1% ± 7.1% vs −26.3% ± 6.9%, P < .0001). Intraobserver and interobserver variabilities were 10.1% and 10.9% in 3DT, and 9.9% and 11.1% in 2DT, respectively.

Conclusion

3DT is a simple, feasible, and reproducible method to measure longitudinal, circumferential, and radial strains. The discordant results between 3DT and 2DT may be explained by the 3D cardiac motion that has been ignored in current 2DT.

Section snippets

Study Population

This study was approved by the local ethical committee, and all subjects gave written, informed consent. Fifty-six healthy volunteers were consecutively enrolled. Ten subjects were excluded from this study because of poor image quality for analysis. Finally, 46 subjects (40 male, aged 29 ± 7 years) were studied. All studied subjects were (1) normotensive, (2) in normal sinus rhythm, and (3) without structural and functional abnormalities (including valvular heart disease) on transthoracic

Average Analysis Time

Average times for acquisition of the echocardiographic images and for the analysis per subject are shown in Table 1. The time for both the image acquisition and the analysis per subject by 3DT was significantly shorter than by 2DT (P < .0001).

Comparison between 3D and 2D Strain Values

Table 2 shows the LV volumes and left ventricular ejection fraction (LVEF) measured by 3D and 2D echocardiography. The end-diastolic volume measured by 2D echocardiography was significantly larger than by 3D echocardiography (P < .0001). However, the

Discussion

This study assessed the different components of strain (longitudinal, radial, and circumferential) values in 16 LV segments by using a newly developed 3D strain imaging and then compared the data with those measured by conventional 2D strain imaging. Our results showed that 1) the newly developed 3D myocardial tracking technique is a simple, feasible, and reproducible method to measure the strains; 2) the mean strain values of 16 segments between 3DT and 2DT showed discordant values in part;

Study Limitations

3DT has a material limitation in time and spatial resolution. However, there was no significant difference in the time to peak strain between 3DT and 2DT. In addition, equivalent reproducibilities of 3DT were demonstrated compared with 2DT. Another limitation of the present study is its small population, with only normal and relatively young individuals. Therefore, prospective studies are needed to clarify the strain values with more elderly, normal subjects and those with cardiac disease.

Conclusions

3DT is a simple, feasible, and reproducible method to measure longitudinal, circumferential, and radial strain values. The discordant results between 3DT and 2DT may be explained by the 3D cardiac motion that has been ignored in current 2DT. 3DT is a promising technique, which has the advantage of measuring real myocardial movement, including twisting motion of the heart, compared with conventional 2DT.

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