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. 2021 Jul 22;8:701243. doi: 10.3389/fcvm.2021.701243

Table 1.

Characteristic of the four types of secondary (functional) tricuspid regurgitation.

Type of FTR RV dilation Tricuspid annulus RA dilation Leaflet tethering Echocardiography or MRI
LH-TR +++ (also mid and apical RV) ++ ++ +++ graphic file with name fcvm-08-701243-i0001.jpg
PH-TR +++ (also mid and apical RV) ++ +++ +++ graphic file with name fcvm-08-701243-i0002.jpg
RVD-TR +++ (Depending on disease etiology) ++ ++ +++ graphic file with name fcvm-08-701243-i0003.jpg
ITR ++ (Particularly at the basal level) +++ +++ + graphic file with name fcvm-08-701243-i0004.jpg

Term explanation: FTR, functional tricuspid regurgitation; ITR, isolated tricuspid regurgitation; LH-TR, left heart related tricuspid regurgitation; MRI, magnet resonance imaging; PH-TR, precapillary pulmonary hypertension related tricuspid regurgitation; RA, right atrial; RV, right ventricular; RVD, right ventricular disease related tricuspid regurgitation.