A Hidden Cause of Primary Tricuspid Regurgitation.

Tricuspid regurgitation (TR) is characterized by the backward flow of blood from the right ventricle to the right atrium during systole. It can be primary, involving intrinsic valve abnormalities, or secondary, due to deformation of the valve apparatus. This case is notable for severe TR following previously unreported chest trauma, emphasizing the importance of detailed medical history in diagnosing valvular conditions. A 62-year-old patient with right atrial and ventricular dilation was diagnosed with severe TR during a routine checkup. Echocardiography showed a prolapsed posterior tricuspid leaflet and annular dilation. Later, a prior chest trauma from a car accident was identified as the likely cause. This case highlights the need for a detailed history and echocardiography to assess TR severity, especially after chest trauma, to prevent right dysfunction and worsening outcomes.