Endo-Aortic Balloon Occlusion versus Transthoracic Clamping in Minimally Invasive Mitral Valve Surgery

OBJECTIVES: The present study compared the clinical outcome between endo-aortic balloon occlusion (EABO) and transthoracic clamping (TTC) in patients undergoing minimally invasive mitral valve surgery (MIMVS).

METHODS: All patients from the Mini-Mitral International Registry undergoing MIMVS were primarily considered for study inclusion. One-to-one nearest neighbour propensity score matching considering clinically relevant baseline covariates. The matched cohort was investigated regarding the clinical outcome between EABO and TTC according to the end-point definitions of the Mitral Valve Academic Research Consortium.

RESULTS: From 2015 to 2021, a total of 6884 patients were primarily included in the study. Propensity score matching resulted in a population of 733 matched pairs. Patients treated with EABO showed significantly lower rates of conversion to sternotomy (13 [1.8%] vs 34 [4. 6%]; P = .001), longer cardiopulmonary bypass time (124 min [105-147] vs 120 min [90-148]; P = .001), and a longer intubation time (11.8 h [7.9-22.2] vs 10.8 h [6.4-20.0]; P < .001). No statistically significant differences were observed regarding postoperative mortality, stroke, bleeding requiring revision, vascular complications, intensive care unit stay, or hospital length of stay.

CONCLUSIONS: In patients undergoing MIMVS, EABO and TTC are excellent options for aortic clamping. EABO showed benefits over TTC with lower rates of conversion to full sternotomy.