Introduction: Given several reports of an increased neurologic risk with retrograde arterial perfusion in minimally invasive mitral valve surgery, we sought to identify and synthesize the best available evidence on the influence of perfusion strategy on post-operative clinical outcomes in this population.
Methods: A systematic search of PubMed, EMBASE, MEDLINE, and Cochrane library databases was performed to identify publications comparing clinical outcomes associated with antegrade and retrograde arterial perfusion in minimally invasive mitral valve surgery. Pre-specified outcomes of interest were neurologic events, mortality, and renal failure. The search was performed by two independent reviewers, with data abstraction following.
Results: Seven observational studies were included in this review, with a total patient population of 5,385. Six were retrospective cohort in design, with a single small prospective cohort study identified. When available, adjusted publication-specific risk estimates were abstracted and included preferentially over unadjusted or reviewer-derived risk estimates. Meta-analysis was felt to be heavily flawed in the context of few small studies identified and was not performed. In adjusted estimates, there appeared to be an increased risk of neurologic complications with retrograde arterial perfusion. There was a null pattern apparent between arterial perfusion strategy and each of 30-day mortality and renal failure.
Conclusion: Retrograde arterial perfusion in minimally invasive mitral valve surgery may be associated with an increased risk of neurologic events, without affecting the risk of 30-day mortality or renal failure. Although these patterns were identified, an overall paucity of evidence justifies further study.
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