All images were digitally stored and analyzed using off-line post processing with QLAB 9 and EchoPAC 11 Software packages. Thirty-one of them had known cardiac disease, with estimated left ventricular ejection fraction <50%, while 32 were free of any cardiovascular disease (control subjects). Sixty-three subjects, mean age 56.2☑0.4 years, underwent complete echocardiographic studies with two different devices (Philips IE33 and General Electric VIVID E9) performed by the same operator. However, there is a lack of standardization of the acquired data among different manufacturers. STE is an emerging quantitative ultrasound technique that allows an accurate evaluation of global and segmental myocardial function. To compare the peak global longitudinal myocardial strain (PGLS) and peak segmental longitudinal myocardial strain (PSLS) values by speckle-tracking echocardiography (STE) obtained using two different echocardiography devices.
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