RESUMO
Objective To evaluate the dynamic changes of left ventricular systolic blood flow hemodynamics in patients with acute myocardial infarction(AMI) before percutaneous coronary intervention (PCI) and short-term after PCI by vector flow mapping (VFM).MethodsTwenty-five patients with AMI were examined by color Doppler two-dimensional echocardiography respectively before PCI and three days and one month after PCI.The standard apical three-chamber color images in three sequent cardiac cycles were acquired and analyzed on off-line by VFM.In systole,the parameters of vortex including horizontal length,longitudinal length,transverse position,vertical position,and maximum vector velocity were measured respectively,and all parameters three days and one month after PCI were compared with those before PCI respectively.Results In systole,there were not statistically significant differences between parameters three days after PCI and those before PCI( P ＞0.05).Compared parameters one month after PCI with those before PCI,horizontal length was longer( P ＜0.05),longitudinal length was shorter (P ＜0.05),the transverse position was closer to anterior ventricular septum( P ＜0.05),and the maximum vector velocity of vortex was increased ( P ＜ 0.05).Conclusions VFM may serve as an ideal tool to quantitatively evaluate the blood flow hemodynamics of left ventricle in patients with AMI after short-term therapy by PCI.