Edge-to-edge repair for tricuspid valve regurgitation: 1-year follow up and clinical implications from the TR- Interventional Study (TRIS)

Abstract Background Tricuspid regurgitation (TR) affects 7% of the population, contributing significantly to heart failure-related hospitalizations. Traditional treatments have several limitations, prompting the exploration of innovative interventions. Purpose The present study aims to investigate the efficacy of tricuspid valve transcatheter edge-to-edge repair (T-TEER) in real-world patients with severe and symptomatic TR deemed at high surgical risk. Primary objectives focus on assessing T-TEER-induced TR reduction and reverse structural remodeling of the RV. Secondary objectives include assessment of functional status, quality of life, and residual regurgitation during the 12-month follow-up period. Methods The TR-Interventional study (TRIS) is a prospective, single-arm study. From January 2021 to December 2023, we enrolled 44 symptomatic patients with at least severe TR referred for TEER. Outcomes included safety and effectiveness along with assessment of clinical status. Results The study cohort had a mean age of 78.3±7 years, with 77.3% women and a mean TRISCORE of 5.1±1.9. Seventeen patients (38.6%) had massive, 7 (15.9%) had torrential, and 20 (45.5%) patients had severe TR. Etiologies included functional (40.9%), degenerative (13.64%), lead-induced (15.9%), and mixed (29.54%) origin. The primary efficacy endpoint, which assesses the successful implantation and performance of the device at the 30-day mark, was attained in 82.9% of patients. The secondary efficacy endpoint, assessing the stability of TR reduction at the 12-month, was achieved in 82,3% of patients. Post-procedural TR reduction of at least 2 degrees was achieved in 84% of patients. Echocardiographic assessments indicate ongoing beneficial remodeling over the one-year follow-up (Figure 1). Effects on RV remodeling also became apparent at the one-year follow-up, including reductions in the RV end-diastolic basal (p<0.01) and medium (p= 0.04) diameters of the TA septal-lateral diameter (p< 0.01). Significant reduction in vena contracta width (9 mm to 3 mm; p=<0.01), regurgitant volume (58 ml to 30 ml; p<0.01), and effective regurgitant orifice area (EROA) (0.6 cm2 to 0.3 cm2; p<0.01), occurred between baseline and one-year follow-up (Figure 2). The NYHA Functional Class and KCCQ scores were improved from 30 days to 1 year (Figure 2). Conclusion TRIS suggests that T-TEER is a durable, effective, and safe therapeutic option for high-risk patients with severe TR. The enduring nature of TR reduction at one year correlates with sustained clinical benefits and reverse structural remodeling of the right ventricle.TR reductionNYHA and functional status