Role of multi-modality imaging for the comprehensive characterization of atrial secondary tricuspid regurgitation patients. 3D, three-dimensional; A-STR, atrial secondary tricuspid regurgitation; CW, continuous wave; EROA, effective regurgitant orifice area; PISA, proximal isovelocity surface area; RA, right atrium; Reg Vol, regurgitant volume; RV, right ventricle; TV, tricuspid valve; VC, vena contracta. Image prepared with BioRender software