What is tricuspid regurgitation?

• Primary (organic) (Rheumatic, Endocarditis, Myxomatous (TVP), Carcinoid, Radiation, Congenital (Ebstein's), Trauma, Papillary muscle injury (post-MI)) • Secondary (functional) RV and tricuspid annular dilatation due to multiple causes of (RV enlargement (e.g., long-standing pulmonary HTN， remodeling post-RV MI), Chronic RV apical pacing])