Circulation Journal Official Journal of the Japanese Circulation Society http://www. j-circ.or.jp lthough tricuspid regurgitation (TR) has long been neglected based on the false belief that it is extremely rare and not clinically significant, recent studies have shown that it is not a rare disease, and that its prevalence is progressively growing, especially long after left-sided valve surgery. 1,2 In addition, TR development, long after left-sided valve surgery, is closely linked to exercise intolerance and presages a poor outcome, 3-5 even in the absence of left ventricular (LV) dysfunction or pulmonary hypertension. 6-8 In this respect, corrective surgery for TR is considered a reliable therapeutic option if it is performed in a timely manner. 3,9-12 In addition to improvements in symptoms and survival, timely performed corrective TR surgery can cause right ventricular (RV) reverse remodeling. 3,9-11 However, the response to corrective TR surgery varies significantly among patients; some patients experience a significant improvement in subjective symptoms such as exertional dyspnea along with RV reverse remodeling, whereas other patients show no improvement or deterioration of subjective symptoms, but with evident echocardiographic RV reverse remodeling, or vice versa. Thus, we do not know which factor (subjective symptoms or objective RV reverse remodeling) is more trustworthy for predicting the long-term outcome after corrective TR surgery.Hence, the aim of this prospective study was 2-fold: (1) to evaluate the degree of (dis)agreement between subjectively symptomatic amelioration and echocardiographic improvement at 6 months after corrective TR surgery; and (2) to investigate which of the 2 factors is more predictive of a better long-term Background: Subjective clinical improvement does not always go hand-in-hand with right ventricular (RV) reverse remodeling after surgery for isolated severe tricuspid regurgitation (TR). This study aimed to evaluate the level of agreement between clinical improvement and echocardiographic RV reverse remodeling, and determine the relative prognostic powers of these 2 factors in terms of long-term prognosis for patients with isolated TR surgery.