Clinical Impact of Renal Dysfunction in Patients with Severe Tricuspid Regurgitation and Chronic Heart Failure

Background: Renal dysfunction (RD) is common in patients with heart failure (HF), however its impact on clinical outcomes in patients with tricuspid regurgitation (TR) and HF is still debated; therefore, we aimed to assess the impact of RD on clinical outcomes in this population. Methods: All patients with HF and a prevalent or incident diagnosis of TR presenting at two centers between January 2020 and July 2021 were enrolled, in both acute (in-hospitalized patients) and chronic settings (outpatient). Patients were stratified according to the degree of RD (Group 1 <30 mL/min (n = 70), Group 2 30–59 mL/min (n = 123) and Group 3 ≥60 mL/min (n = 56). Results: Out of 249 patients, those with severe RD had lower left ventricular ejection fraction (41.8 ± 13.1% vs. 45.7 ± 14.2% vs. 48.6 ± 13.1%, p = 0.020) and tricuspid annular plane systolic excursion (16.6 ± 3.7 mm vs. 17.6 ± 4.0 mm vs. 20.0 ± 4.4 mm, p < 0.001) while brain natriuretic peptides levels were higher (979 ± 1514 pg/mL vs. 490 ± 332 pg/mL vs. 458 ± 543 pg/mL, p = 0.049) than in the other subgroups. After a median follow-up of 279 (interquartile range, IQR 195–481) days, all-cause mortality was higher in patients with severe RD (37.7% vs. 23.3% vs. 13.7%, p = 0.012). HF hospitalizations (32.7% vs. 31.2% vs. 30.6%, p = 0.970) and the composite of all-cause mortality or HF hospitalization (54.1% vs. 47.9% vs. 42.0%, p = 0.444) did not differ between subgroups. Conclusions: Severe RD is highly present in patients with HF and TR and is associated with increased incidence of all-cause mortality.