ABSTRACT
Definition Tricuspid regurgitation (TR) refers to retrograde flow through the right-sided atrioventricular valve during systole. Trivial amounts are seen in the majority of healthy adults. As in all regurgitant valve lesions, the severity is most commonly graded on a semiquantitative scale. This scale begins at 0 (none), followed by ‘trivial’ (physiologic), 1+ (mild), 2+ (moderate), 3+ (moderate-severe), and 4+ (severe).
