Table 1 Equations used in the present study
Parameter | Equation |
|---|---|
Systemic oxygen delivery (ml/kg·minute) | Cardiac index (ml/kg·minute) × arterial oxygen content (ml/l) |
Hepatosplanchnic oxygen delivery (ml/kg·minute) | Hepatic arterial blood flow (ml/kg·minute) + portal venous blood flow (ml/kg·min) × arterial oxygen content (ml/l) |
Systemic oxygen consumption (ml/kg·min) | Cardiac index (ml/kg·min) × (arterial oxygen content [ml/l] – pulmonary artery oxygen content [ml/l]) |
Hepatic lactate uptake (μmol/kg·minute) | ([Arterial lactate × hepatic arterial blood flow] + [portal vein lactate × portal vein blood flow]) – (hepatic vein lactate × [portal vein blood flow + hepatic arterial blood flow]) |
Hepatic lactate influx (μmol/kg·minute) | (Arterial lactate × hepatic arterial blood flow) + (portal vein lactate × portal vein blood flow) |
Hepatic lactate extraction ratio | Hepatic lactate uptake/hepatic lactate influx |