Isolated tricuspid valve regurgitation resulting from severe annular dilatation: case report.

A rare case of isolated tricuspid regurgitation (TR) in a 65-year-old man is presented. Echocardiography revealed enlargement of the right atrium, dilatation of the tricuspid valve annulus without thickening or prolapse of the leaflets, and an intact atrial septum. No downward displacement of the tricuspid septal leaflet was observed by echocardiography. Mild mitral regurgitation and severe TR were detected on color flow Doppler studies. Cardiac catheterization indicated elevated right atrial pressure, with a pronounced V-wave. No left-to-right shunt was detected at the right atrium. At surgery, severe annular dilatation of the tricuspid valve (without organically diseased or deformed tricuspid leaflets) was observed, and tricuspid annuloplasty with a prosthetic ring performed. Postoperative echocardiography and right ventriculography showed trivial TR.