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Table 2 Calculation of available oxygen (O2av in ml/min) in bleeding polytrauma patients according to the formula described by Nunn and Freeman in 1964 [15].

From: Metabolic changes after polytrauma: an imperative for early nutritional support

O2av= CO × SaO2 × Hb × 1.34
  1. [CO, cardiac output (ml/min); SaO2, arterial oxygen saturation (%); Hb, hemoglobin concentration (g%); 1.34, O2 binding capacity constant (ml O2/g Hb)].