Right Heart Remodeling and Outcomes in Patients With Tricuspid Regurgitation: A Literature Review and Meta-Analysis.

Background: Functional tricuspid regurgitation (TR) can develop either because of right ventricular (RV) remodeling (ventricular functional TR) and/or right atrial dilation (atrial functional TR).

Objectives: This meta-analysis aimed to investigate the association between right heart remodeling and long-term (>1 year) all-cause mortality in patients with significant TR (at least moderate, ≥2+).

Methods: MEDLINE, ISI Web of Science, and SCOPUS databases were searched. Studies reporting data on at least 1 RV functional parameter and long-term all-cause mortality in patients with significant TR were included. This study was designed according to PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-Analyses) requirements.

Results: Out of 8,902 studies, a total of 14 were included, enrolling 4,394 subjects. The duration of follow-up across the studies varied, ranging from a minimum of 15.5 months to a maximum of 73.2 months. Overall, long-term all-cause mortality was 31% (95% CI: 20%-41%; P ≤ 0.001). By means of meta-regression analyses, an inverse relation was found between tricuspid annular plane systolic excursion (11 studies enrolling 3,551 subjects, -6.3% [95% CI: -11.1% to -1.4%]; P = 0.011), RV fractional area change (9 studies, 2,975 subjects, -4.4% [95% CI: -5.9% to -2.9%]; P < 0.001), tricuspid annular dimension (7 studies, 2,986 subjects, -4.1% [95% CI: -7.6% to -0.5%]; P = 0.026), right atrial area (6 studies, 1,920 subjects, -1.9% [95% CI: -2.5% to -1.3%]; P < 0.001) and mortality.

Conclusions: RV dysfunction parameters are associated to worse clinical outcomes in patients with TR, whereas right atrial dilatation is linked to a better prognostic outcome. Further studies are needed to unravel the pathophysiological differences within the functional TR spectrum. (Right heart remodeling and outcomes in patients with tricuspid regurgitation; CRD42023418667).