Methodological study of flow field uniformity of mitral valve using vector flow mapping / 中华超声影像学杂志

ABSTRACT

Objective To establish a quantitative measurement of flow field uniformity of mitral valve in vivo and investigate the correlation between the parameter of flow field uniformity and the degree of mitral stenosis. Methods The flow field uniformity downstream of mitral valve in normal cases and patients with mitral stenosis were studied using vector flow mapping(VFM) technique. Results The flow field uniformity parameter of standard deviation of velocity (Vsd) in patients with mitral valve stenosis was significantly higher than that in control group ( P <0. 05). There was a negative linear correlation between Vsd and effective orifice area(EOA) in patients with mitral valve stenosis (parasternal long-axis: r = - 0. 816, P = 0.000; apical four chamber: r = - 0. 825, P = 0. 000). Conclusions VFM can really reflect the flow field uniformity of normal cases and patients with mitral stenosis.