Willems, T.P.

aortic aortic regurgitation valve patient regurgitation replacement implantation allograft technique method diameter aortic root replacement doppler subcoronary severity color subcoronary implantation technique subcoronary implantation measurement autograft reoperation study follow-up chapter root replacement grade tissue color doppler echocardiography echocardiographic outflow echocardiography aortic valve tissue valves tract jet diameter outflow tract difference regurgitant aortic valve replacement ratio jet diameter method examination analysis range root replacement technique aortic regurgitation severity homograft result aortic position incidence assessment quantification jet diameter ratios variability value curve aortic allograft length group reproducibility nanda nc aortic root position failure correlation regurgitant jet function jet length method agreement figure ventricle observer leaflet durability angiography implantation technique surgeon heart 30 patients jet area method