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©2013 UpToDate ® Print Email Two-dimensional transthoracic echocardiogram (2D TTE) and M mode images showing a normal tricuspid valve The tricuspid valve (tv) can be imaged from the precordial long axis view (panel A). In panel B, the M-mode beam is directed through the septal leaflet (inset); an M-mode echocardiogram typically shows a single anteriorly moving leaflet. In this example, atrial fibrillation is present, resulting in a wave form that is of irregular duration, shows early diastolic opening, and occasional small movements arising from rapid fibrillatory contraction. Additionally, the right atrium (RA) is enlarged. RV: right ventricle.