**5.2 Etiology of tricuspid valve disease and type of procedure**

The etiology of tricuspid valve disease and types of procedures are depicted in **Table 5**. Among patients who underwent surgery, tricuspid regurgitation appeared due to infective endocarditis in 15 (75%) patients, as part of congenital disease in 4 (20%) patients, and degenerative lesions in 3 (15%) patients. Bioprosthetic failure accounted for 3 (15%) patients and mechanical prosthesis thrombosis in 1 patient. Most of the patients underwent intervention under either elective or urgent settings—8 (40%) and 10 (50%) patients respectively. Emergent tricuspid valve replacement was performed in two patients. There were 15 (75%) primary cases and 5 (25%) redo cases with a median interval from the first surgery 26 [3.5–78] months.
