Predictability and durability of mitral valve repair in patients with severe degenerative mitral regurgitation in medium sized centres

Introduction Mitral valve repair (MVr) is now the treatment of choice to correct severe degenerative mitral regurgitation (MR). Repair rates vary greatly from centre to centre, and the concept of heart valve centres of excellence has been established. Objective The purpose of this study was to see whether large international centre repair rates, and outcomes, are transferrable to medium-sized centres with an interest in mitral repair. Methods Between 2011 and 2018, a total of 346 patients underwent mitral valve surgery by a single surgeon. Of these, 238 consecutive patients had repairs, or attempted repairs for degenerative MR, and are included in this study. Results The study sample consisted of 71% male patients and had a mean age of 64.4 +/- 12.3 years; 66% of the study population had concomitant procedures. The overall repair rate in this cohort is 99%. Mean follow up was 3.7 +/- 1.9 years. At 5 years, the freedom from MR >= 3+ was 95.9 +/- 1.9% and at 7 years 91.1 +/- 3.8%. Freedom from reoperation at 5 years was 92.9 +/- 3.7%, while the 5 years actuarial survival was 89.1 +/- 3.7%. On a multivariate analysis, predischarge echo grade was associated with higher risk of future reoperation (odds ratio (OR) = 21.82, p = 0.05). Only age (OR = 1.3, p = 0.03) was predictive of long-term survival. Conclusions In specialised medium-sized heart centres, where the surgical team have undergone specialist mitral training, favourable short- and long-term outcomes are achievable with mitral repair rates similar to those from large international centres of excellence. In these heart centres, early surgery should be considered for all patients with severe degenerative MR.