Speckle-tracking ultrasonography has been applied to the assessment of circumferential strain (ɛ) and strain rate (SR) of the common carotid artery (CCA).1-5 Originally developed for echocardiography,6 the analysis of ɛ is tethered to key points of the electrocardiogram (ECG). Thus, to prevent measurement drift, speckle-tracking ultrasonography software assumes no deformation (i.e., 0% ɛ) at the start of the cardiac cycle defined by the QRS wave. However, the pressure wave will take some time to travel from the aortic valve to the insonated section of vasculature, meaning vascular expansion and recoil occur shortly after ventricular systole.
|Number of pages||3|
|Journal||Journal of the American Society of Echocardiography|
|Early online date||12 Mar 2020|
|Publication status||Published - May 2020|
- Short report
- Speckle tracking
Sculthorpe, N., Campbell, A., & Beaumont, A. (2020). Electrocardiogram-based timings cause systematic errors in vascular strain measures: a method for error correction and estimation of pulse transit time. Journal of the American Society of Echocardiography, 33(5), 636-638. https://doi.org/10.1016/j.echo.2020.02.002