on the basis of the qrs synchronized appearance of contrast in the inferior vena cava by the subxiphoid approach or of the negative contrast effect above the tricuspid valve just after the contrast entered the right ventricle with its subsequent back-and-forth movements across the tricuspid valve , doppler 2-d echo was more sensitive and specific in detecting tr ( 100 % and 100 % ) than contrast 2-d echo ( 75 % and 82 % in the subxiphoid view , 56 % and 100 % in the 4-chamber view ) when the fast fourier transformation frequency analysis was used as the standard of tr , and it was more sensitive in detecting tr ( 85 % ) than contrast 2-d echo ( 69 % in the subxiphoid approach , 46 % in the 4-chamber view ) when right ventriculography was used as the standard of tr .
C0225883
right ventricle
C0040960
tricuspid valve