• Adam S Evans, Matthew A Levin, Hung-Mo Lin, Ken Lee, Menachem M Weiner, Anelechi Anyanwu, David H Adams, and MittnachtAlexander J CAJCDepartment of Anesthesiology, The Icahn School of Medicine at Mount Sinai, New York, NY. Electronic address: alexander.mittnacht@mountsinai.org..
• Department of Cardiothoracic Surgery, The Icahn School of Medicine at Mount Sinai, New York, NY; Department of Anesthesiology, The Icahn School of Medicine at Mount Sinai, New York, NY.
• J. Cardiothorac. Vasc. Anesth. 2018 Apr 1; 32 (2): 636-643.

ObjectivesBlood lactate is frequently used to guide management in critically ill patients. In patients undergoing mitral valve surgery, an elevated lactate level is frequently observed; however, overall mortality is low. The authors hypothesized that hyperlactemia is not a useful predictor of poor outcomes in this patient population. The main aim of this study was to explore how blood lactate level and lactate clearance are associated with 30-day mortality and major adverse events in patients undergoing mitral valve surgery.DesignThis was a retrospective database review. Logistic regression analysis was performed to assess the associations of perioperative factors with blood lactate in the intensive care unit (ICU).SettingTertiary-care teaching hospital.ParticipantsThe study comprised 917 patients undergoing mitral valve surgery.InterventionsNone.Measurements And Main ResultsThe majority of patients (71.8%) had elevated blood lactate ≥2 mmol/L on ICU admission; however, within 24 hours, 85.1% of all patients had normal lactate values. Overall 30-day mortality was 2.29% (n = 21). The combination of lactate ≥7 mmol/L on ICU admission and a persistent elevated blood lactate level 24 hours after ICU admission provides an excellent prediction of 30-day mortality (C statistic = 0.85). However, even a significantly elevated lactate level on ICU admission was well-tolerated in the majority of patients as long as lactate values normalized within 24 hours. Male sex, longer cardiopulmonary bypass time, blood transfusion in the ICU, and an elevated blood lactate level on ICU admission and 12 hours after ICU admission all were independent risk factors of clearance failure.ConclusionsAn elevated blood lactate level is common after mitral valve surgery and is well-tolerated in the majority of patients. Adding lactate clearance improved the predictive value of the blood lactate level.Copyright © 2017 Elsevier Inc. All rights reserved.

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