Key result
Absolute strain values measured using relatively high frame rate speckle-tracking echocardiography were significantly higher than those measured with conventional frame rate (p < 0.001).
Why the study?
The accuracy of speckle-tracking echocardiography depends on temporal resolution, motivating an assessment of the feasibility of relatively high frame rate imaging.
Does relatively high frame rate (rHi-FR) speckle-tracking echocardiography yield different global longitudinal strain values compared to conventional frame rate in patients with normal left ventricular systolic function?
Observational (n=143)
Does relatively high frame rate (rHi-FR) speckle-tracking echocardiography yield different global longitudinal strain values compared to conventional frame rate in patients with normal left ventricular systolic function?
p-value: p=< 0.001
Relatively high frame rate speckle-tracking echocardiography (~200 fps) yields significantly higher absolute strain values than conventional frame rates, suggesting improved temporal resolution for myocardial strain measurement.
GLS values vary with frame rate; leaves open optimal acquisition settings for reproducible strain assessment.
Background: The accuracy of speckle-tracking echocardiography (STE) depends on temporal resolution. The goal of this study was to demonstrate the feasibility of relatively high frame rate (rHi-FR) (~200 fps) for STE. Methods: In this prospective study, echocardiographic images were acquired using clinical scanners on patients with normal left ventricular systolic function using rHi-FR and conventional frame rate (Reg-FR) (~50 FPS). GLS values were evaluated on apical 4-, 2- and 3-chamber images acquired in both rHi-FR and Reg-FR. Inter-observer and intra-observer variabilities were assessed in rHi-FR and Reg-FR. Results: There were 143 echocardiograms evaluated in this study. The frame rate of rHi-FR was 190 ± 25 and Reg-FR was 50 ± 3, and the heart rate was 71 ± 13. Absolute strain values measured in rHi-FR were significantly higher than those measured in Reg-FR (all p < 0.001). Inter-observer and intra-observer correlations were strong in both rHi-FR and Reg-FR. Conclusions: We demonstrated that absolute strain values were significantly higher using rHi-FR when compared with Reg-FR. It is plausible that higher temporal resolution enabled the measurement of myocardial strain at desired time point. Further investigations are necessary to evaluate the value of rHi-FR to assess myocardial strain in the setting of tachycardia.
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Fujikura et al. (2021) conducted an observational in Normal left ventricular systolic function (n=143). Relatively high frame rate (rHi-FR) speckle-tracking echocardiography vs. Conventional frame rate (Reg-FR) speckle-tracking echocardiography was evaluated on Absolute strain values (GLS) (p=< 0.001). Absolute strain values measured using relatively high frame rate speckle-tracking echocardiography were significantly higher than those measured with conventional frame rate (p < 0.001).
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