"Assessment of the morphology of a regurgitant jet, then, is paramount prior to quantitation of severity, especially when using colour flow Doppler indices"
"with an absent forward stroke volume from the right ventricle (RV) in e.g. pulmonary atresia, the Coanda effects may result in a flow loop, with a jet adhering to the right wall of the main pulmonary artery, reversing direction and travelling toward the MPA bifurcationthis may mimic physiologic, systolic flow from the RV through the pulmonic valve into the MPA"
"The mechanism is thought to be related to entrainment of fluid from the downstream chamber into the jet, creating an area of low pressure around the jet margins; if a surface is sufficiently close to one of these low-pressure margins, the jet deviates toward the surface 1."