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Article Dans Une Revue PLoS ONE Année : 2018

Accuracy of speckle tracking in the context of stress echocardiography in short axis view: An in vitro validation study

Résumé

Aim: This study aimed to test the accuracy of a speckle tracking algorithm to assess myocardial deformation in a large range of heart rates and strain magnitudes compared to sonomicrometry. Methods and results: Using a tissue-mimicking phantom with cyclic radial deformation, radial strain derived from speckle tracking (RS-SpT) of the upper segment was assessed in short axis view by conventional echocardiography (Vivid q, GE) and post-processed with clinical software (EchoPAC, GE). RS-SpT was compared with radial strain measured simultaneously by sonomicrometers (RS-SN). Radial strain was assessed with increasing deformation rates (60 to 160 beats/min) and increasing pulsed volumes (50 to 100 ml/beat) to simulate physiological changes occurring during stress echocardiography. There was a significant correlation (R 2 = 0.978, P <0.001) and a close agreement (bias ± 2SD, 0.39 ± 1.5%) between RS-SpT and RS-SN. For low strain values (<15%), speckle tracking showed a small but significant overestimation of radial strain compared to sonomicrometers. Two-way analysis of variance did not show any significant effect of the deformation rate. For RS-SpT, the feasibility was excellent and the intra-and inter-observer variability were low (the intraclass correlation coefficients were 0.96 and 0.97, respectively). Conclusions: Speckle tracking demonstrated a good correlation with sonomicrometry for the assessment of radial strain independently of the heart rate and strain magnitude in a physiological range of values. Though speckle tracking seems to be a reliable and reproducible technique to assess myocardial deformation variations during stress echocardiography, further studies are mandated to analyze the impact of angulated and artefactual out-of-plane motions and inter-vendor variability.
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Dates et versions

hal-01826101 , version 1 (29-06-2018)

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Amir Hodzic, Boris Chayer, Diya Wang, Jonathan Porée, Guy Cloutier, et al.. Accuracy of speckle tracking in the context of stress echocardiography in short axis view: An in vitro validation study. PLoS ONE, 2018, 13 (3), ⟨10.1371/journal.pone.0193805⟩. ⟨hal-01826101⟩
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