To investigate the frame of reference with the downward displacement of
the posterior leaflet and anterior leaflet of tricuspid valve in
children by ultrasound.The downward degree of anterior and posterior
tricuspid valve was evaluated with tricuspid annulus and coronary sinus
as reference structures under ultrasound, and the position of tricuspid
regurgitation orifice was shown by color ultrasound. Color Doppler flow
imaging showed that the position of tricuspid regurgitation orifice
moved down obviously in all 42 children. One case showed 2.2cm from the
root of the anterior valve to the tricuspid annulus in the two-chamber
and four-chamber view of the apical right heart. Color Doppler can show
that the position and direction of tricuspid regurgitation orifice are
obviously deviated to the anterolateral side. The obvious deviation of
the tricuspid regurgitation orifice to the anterolateral direction may
be an ultrasonic sign for diagnosing the downward displacement of the
anterior tricuspid valve in children.