Abstract
The aim is to investigate whether strain by 2D speckle tracking echocardiography in patients with acute myocardial infarction (AMI) and preserved ejection fraction (EF≧40%) would predict prognosis and segmental function recovery or not. Ninety patients (average age 60.7±12.3 y/o) with new-onset AMI and EF≧40% were enrolled. Echocardiographies were performed after admission (average 3.3 days) and 12 months after percutaneous coronary intervention. Segmental function recovery was defined as a decrease of ≧1 grade in segmental wall motion score. The global peak longitudinal strain (GLS), circumferential strain (CS), and radial strain (RS) were calculated via EchoPAC, version 11.0 (GE Vingmed). During follow-up (mean 23.4±12.1months), 20 patients had adverse events including 6 deaths, 3 strokes, 15 revascularizations for culprit vessels. In the multivariate Cox proportional hazard regression model for adverse events, using the forward stepwise method, only female (hazard ratio 4.65 [95% CI =1.49-14.52]) and GLS (hazard ratio 1.16 [95% CI =1.03-1.3]) were independent predictors (p < 0.05). Receiver operating characteristic curve analyses for segmental function recovery showed the area under the curves was 0.75 and optimal cut-off value of –12.5% had 67% sensitivity and 76% specificity. Global longitudinal strain by 2D speckle tracking echocardiography provided important prognostic information and could predict segmental function recovery in patients with AMI and preserved EF.
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