<prompt> The most common cause of tricuspid regurgitation is secondary to -Rheumatoid hea diseaseDilatation of right ventricleCoronary aery diseaseEndocarditis due to intravenenous drug abuse  <response>: Tricuspid regurgitation Primary Rheumatic Endocarditis Myxomatous TVP Carcinoid Radiation Congenital Ebsteins Trauma Papillary muscle injury post-MI Secondary RV and tricuspid annular dilatation Multiple causes of RV enlargemente.g., long-standing pulmonary HTNChronic RV apical pacing Harrison;s principle of internal medicine,18th edition,pg no. 1930 