I am trying to analyze LA function and using atrial tissue velocity at the isovolumic contraction time(IVCT) on tissue Doppler imaging. See attached file. Is that sampling correct? Most papers have used systolic, early diastolic (E) and late diastole (A) for assessment of atrial function representing reservoir, conduit and contraction function. Has anyone seen the IVCT atrial velocity below the mitral annulus as a measure of atrial function?See the attached file for a visual reference.