To maintain specificity, echocardiographic and Doppler results should meet the following criteria (1) for acute rheumatic carditis: Doppler flow criteria: Pathologic mitral regurgitation: Must be seen in at least 2 views, and have a jet length ≥ 2 cm in at least 1 view, a peak velocity of > 3 m / second, and a pansystolic jet in at least 1 envelope Pathologic aortic regurgitation: Must be seen in at least 2 views, and have a jet length ≥ 1 cm in at least 1 view, a peak velocity of > 3 m / second, and a pandiastolic jet in at least 1 envelope Echocardiographic morphologic criteria: Pathologic mitral valve morphologic changes include annular dilation, chordal elongation or rupture with flail leaflet, anterior (or less commonly posterior) leaflet tip prolapse, or beading / nodularity of leaflet tips.