Higher-risk mitral valve operations after previous sternotomy: endoscopic, minimally invasive approach improves patient outcomes

Losenno, Katie L.; Jones, Philip M.; Valdis, Matthew; Fox, Stephanie A.; Kiaii, Bob; Chu, Michael W. A.
December 2016
Canadian Journal of Surgery;Dec2016, Vol. 59 Issue 6, p399
Academic Journal
journal article
Background: Reoperative mitral valve (MV) surgery is associated with significant morbidity and mortality; however, endoscopic minimally invasive surgical techniques may preserve the surgical benefits of conventional mitral operations while potentially reducing perioperative risk and length of stay (LOS) in hospital.Methods: We compared the outcomes of consecutive patients who underwent reoperative MV surgery between 2000 and 2014 using a minimally invasive endoscopic approach (MINI) with those of patients who underwent a conventional sternotomy (STERN). The primary outcome was in-hospital/30-day mortality. Secondary outcomes included blood product transfusion, LOS in hospital and in the intensive care unit (ICU), and postoperative complications.Results: We included 132 patients in our study: 40 (mean age 68 ± 14 yr, 70% men) underwent MINI and 92 (62 ± 13 yr, 40% men) underwent STERN. The MINI group had significantly more comorbidities than the STERN group. While there were no significant differences in complications, all point estimates suggested lower mortality and morbidity in the MINI than the STERN group (in-hospital/ 30-day mortality 5% v. 11%, p = 0.35; composite any of 10 complications 28% v. 41%, p = 0.13). Individual complication rates were similar between the MINI and STERN groups, except for intra-aortic balloon pump requirement (IABP; 0% v. 12%, p = 0.034). MINI significantly reduced the need for any blood transfusion (68% v. 84%, p = 0.036) or packed red blood cells (63% v. 79%, p = 0.042), fresh frozen plasma (35% v. 59%, p = 0.012) and platelets (20% v. 40%, p = 0.024). It also significantly reduced median hospital LOS (8 v. 12 d, p = 0.014). An exploratory propensity score analysis similarly demonstrated a significantly reduced need for IABP (p < 0.001) and a shorter mean LOS in the ICU (p = 0.046) and in hospital (p = 0.047) in the MINI group.Conclusion: A MINI approach for reoperative MV surgery reduces blood product utilization and hospital LOS. Possible clinically relevant differences in perioperative complications require assessment in randomized clinical trials.


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