Comparison of a full sternotomy with a minimally invasive approach for concomitant mitral and tricuspid valve surgery

OBJECTIVES: The need for concomitant tricuspid surgery in patients who need mitral valve surgery casts doubt on its feasibility via a minimally invasive approach. Our goal was to evaluate the short-term outcomes of patients undergoing concomitant mitral and tricuspid valve surgery either with a standard full sternotomy (full-MTS) or a minimally invasive approach (mini-MTS). METHODS: The outcomes of patients who had combined mitral and tricuspid valve surgery in 11 centres were retrospectively evaluated. The primary outcome was the incidence of 30-day mortality. A propensity score matched cohort was selected to create 2 comparable groups stratified by surgery (valve replacement or repair). RESULTS: During the study period, 1048 consecutive patients had combined mitral and tricuspid valve surgery (730 full-MTS, 318 miniMIS). The matching procedure paired 192 full-MTS to 192 mini-MTS procedures. After matching, mini-MTS was associated with longer cardiopulmonary bypass [123 min, standard deviation (SD) 46, vs 102 min, SD 36, P = 0.001] and cross-clamping times (89 min, SD 34, vs 78 min, SD 29, P= 0.003). Although the hospital length of stay was shorter (8 days, interquartile range 7-12 vs 9 days, interquartile range 714, P = 0.034) with mini-MTS before matching, this difference disappeared after matching. No differences in other major complications or in 30-day mortality were observed: 48 deaths (4.6%), 36 of which (4.9%) occurred in patients who had a full-MTS and 12 (3.8%), in patients who had a mini-MTS (4.7% in both approaches paired by propensity). CONCLUSIONS: The mini-MTS approach proved to be safe and effective in patients requiring concomitant mitral and tricuspid surgery. We could not demonstrate any difference in short-term outcomes between the 2 surgical approaches, indicating that there is not a preferred surgical approach.