Should Moderate or Less Functional Tricuspid Regurgitation be Repaired During Surgery for Degenerative Mitral Valve Disease?

Background: It is unclear whether moderate or less functional tricuspid regurgitation (TR) should be repaired during surgery for degenerative mitral valve (MV) disease. We studied the natural course of unaddressed moderate or less TR and identified risk factors for TR progression after surgery for degenerative MV disease. Methods: From 2001 to 2011, 2,982 patients with isolated degenerative MV disease and no evidence of coronary artery disease underwent MV surgery. To generate an enriched sample of patients with TR, by random selection 200 patients without TR, 197 with mild TR, and 177 with moderate TR were studied. A total of 1,150 echocardiograms were available for longitudinal analysis of TR progression after surgery in 550 of these 574 patients. Results: Overall prevalence of severe TR was 1.1%, 2.2%, 3.6%, and 4.4% by 1, 3, 5, and 7 years, respectively. Patients with moderate preoperative TR were more likely to progress to severe TR by 7 years (8.6%) than those with mild TR (3.2%) or no TR (1.3%) preoperatively (p p = 0.03), shorter right ventricular base-to-apex length (p = 0.0004), smaller tethering area (p = 0.01), older age, and preoperative heart failure. During follow-up, no patient underwent TV intervention. Conclusion: Routine repair of moderate or less functional TR during surgery for degenerative MV disease does not appear to be warranted, because progression to severe TR is uncommon. Instead, we suggest a tailored approach, reserving TR repair during surgery for degenerative MV disease for patients with known risk factors.