BACKGROUND: Hepatic vein (HV) Doppler plays an important part intricuspid regurgitation (TR) severity grading, that the presence ofholo-systolic reversal indicates severe TR. However, the sensitivity andspecificity of Superior vena cava (SVC) Doppler for diagnosis of severe TR hasnever been investigated. OBJECTIVES: 1.) To evaluate the sensitivity and specificity of SVC Doppler for diagnosis of severe TR, using regurgitant jet area (RJA) as a gold standard 2.) To compare SVC and HV Doppler for the diagnosis of severe TR. METHOD: In 73 patients with TR, the SVC and HV Doppler were obtainednoninvasive and compared with TR severity grading by RJA method. RESULTS: The mean age of the patients was 55 (+,ฑ) 17 years. Male : femalewas 30:43. Basic rhythms were AF in 71% and sinus in 25%. Most (90%) of thepatients had pulmonary HT (mean systolic PAP 51 (+,ฑ) 20 mmHg). Another 8% hadprimary TV disease. Severe TR by RJA 40 % criteria was observed in 32 patients(44%). The test characteristics of the SVC and HV Doppler were shown as in the table.