The regurgitant jet seen in the left atrium (LA) is represented in blue because blood flow is directed away from the transducer. The yellow components are the mosaic pattern traditionally assigned to turbulent or high velocity flow. The arrow points to the hemisphere of blood accelerating proximal to the regurgitant orifice (proximal isovelocity surface area [PISA]). The size of the PISA can be used to help grade the severity of regurgitation. LA = left atrium; LV = left ventricle.
Wed, 2010-07-21 06:03