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McCoy AM, Hackett ES, Wagner AE, Mama KR, Hendrickson DA: Pulmonary Gas Exchange and Plasma Lactate in Horses with Gastrointestinal Disease Undergoing Emergency Exploratory Laparotomy: A Comparison with an Elective Surgery Horse Population. Vet Surg 2011; 40: 601609. http://onlinelibrary.wiley.com/doi/10.1111/j.1532-950X.2011.00840.x/pdf

Regrettably, numbers reported were incorrect regarding arterial lactate concentration cutoffs after anesthetic recovery. We reported that horses with recovery arterial lactate concentration >5 mmol/L were at significantly increased risk of developing postoperative complications. Horses with lactate concentration >5 mmol/L had a 2.02 times higher relative risk of complications (95% CI: 0.9-4.4) than those with a lower lactate concentration, P = .067. Though this did not reach statistical significance, the doubling of risk was considered clinically significant. Horses with lactate concentration >6 mmol/L had a 2.2 times higher relative risk of complications (95%CI: 1.0-5.1, P = .055) and horses with lactate concentration >6.5 mmol/L had a 3.3 times higher relative risk of complications (95%CI: 1.2-9.0, P = .011). Horses with arterial lactate concentration >7 mmol/L in recovery had an 11.27 times higher relative risk (95%CI: 1.4-90.3, P = .013) for postoperative death than did those with a lower lactate concentration. These alterations do not change the underlying interpretation of the study that increasing arterial lactate concentrations observed in horses after anesthetic recovery from gastrointestinal surgery are associated with increasing risk of postoperative complications and death.