Early Mortality in Cardiac Surgery - Is Lactate Significant?

Area of Science:

• Cardiovascular Surgery
• Critical Care Medicine
• Biochemistry

Background:

• Serum lactate indicates tissue hypoperfusion and is used in cardiac surgery patient management.
• Early mortality and postoperative morbidity are key concerns following cardiac surgery.

Purpose of the Study:

• To determine the association between serum lactate levels and early mortality.
• To assess the relationship between lactate and postoperative morbidity in cardiac surgery patients.

Main Methods:

• Prospective cohort study of 270 patients undergoing cardiac surgery.
• Serum lactate levels measured at multiple time points: preoperatively, intraoperatively, and up to 48 hours postoperatively.

Main Results:

• Early mortality occurred in 6.3% of patients.
• Lactate and lactate clearance correlated with mechanical ventilation duration, vasopressor duration, and ICU/hospital stay.
• Preoperative lactate and 24-hour postoperative lactate were independent predictors of mortality.

Conclusions:

• Arterial lactate and lactate clearance correlate with recovery metrics (ventilation, vasopressors, length of stay).
• Lactate can guide postoperative therapeutic decisions.
• Lactate is not a sensitive predictor of mortality on its own.