MELD-Lactate Calculator (for cardiac surgery patients)

MELD-Lactate (for postoperative risk prediction): Explanation and clinical context The MELD-Lactate score was proposed to combine standard liver-failure predictors (the original MELD score, which uses bilirubin, INR and creatinine) with immediate postoperative lactate levels to improve early mortality prediction after major surgery. The original publication (Cardoso et al., Transplant Proceedings 2014) derived the formula: MELD_lactate = 5.68 × ln(lactate) + 0.64 × (Original MELD) + 2.68. In that cohort of post-operative liver transplant patients the MELD-Lactate model demonstrated better discrimination for 30-day mortality than MELD or MELD-Na alone.

Although the original validation was in liver transplant recipients, lactate is a known prognostic marker after cardiac surgery as well; clinicians should therefore interpret MELD-Lactate in the cardiac surgery setting cautiously and ideally in conjunction with cardiac-surgery specific risk metrics and local validation.