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Echocardiography offers the future for infarct size quantification
Date:12/7/2011

echocardiography technique well suited to quantifying infarct size. It works by tracking the movement of natural acoustic markers or "speckles" which are present on standard grey ultrasound tissue images. With the use of wall motion tracking software, speckle movement (and therefore myocardial tissue movement) can be visualised during the cardiac cycle. Speckle-tracking can be used to evaluate myocardial strain, which describes the myocardial deformation throughout the cardiac cycle. Reductions in measurement of strain, have been found to show direct relationships to the size of the infarct.

First use of 3D speckle-tracking to estimate infarct size following STEMI

 Measuring circumferential strain with 3D speckle-tracking provides a good predictor of infarct size after STEMI , finds an Italian study.

In the study, which presents the first data on use of 3D speckle-tracking in measuring infarct size, Dr Denisa Muraru and colleagues from the University of Padua (Italy), estimated infarct size and necrosis transmurality in patients with recent STEMI, who had undergone successful treatment with primary PCI. One of the advantages of 3D speckle-tracking over 2D, say the authors, is that it allows the assessment of longitudinal (apex-to-base shortening), circumferential (shortening in the circumferential direction); radial strain (myocardialwall thickeningtowards LV cavity center) and area strain (a deformation parameter combining longitudinal and circumferential strain) at the same time. In the study, 49 patients with recent STEMI, successfully reperfused with primary PCI were assessed by 3D speckle-tracking, and the obtained LV strain parameters were compared with peak troponin I levels, as an estimate of the extent of myocardial cell injury. In a multivariable analysis, results showed that only circumferential strain emerged as a significant independent predictor of infarct size. Furthermore, in the subgroup of 27 patients who underwent a
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Contact: ESC Press Office
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European Society of Cardiology
Source:Eurekalert

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