Cardiac Output Calculation

Cardiac output is the function of heart rate and stroke volume. It measure amount of blood the heart pumps through the circulatory system in a minute


Cardiac Output Calculation Formula

Cardiac Output (CO) = VO2/ (Ca – Cv)


Ca = (Hgb × 13.4 × O2Sat / 100) + (PaO2 × 0.031)

Cv = (Hgb × 13.4 × O2vSat / 100) + (PvO2 × 0.031)


Where,

  • Hgb: serum hemoglobin (g/dL)
  • O2Sat: arterial oxygen saturation (percent) measured from arterial blood (%)
  • O2vSat: mixed venous oxygen saturation (percent) measured from the pulmonary artery in the absence of a shunt (%)
  • PaO2: the arterial oxygen pressure (mmHg)
  • PvO2: mixed venous oxygen pressure (mmHg)


Oxygen Consumption (VO2) may be determined by:

  • Separate calculation
  • Machine measurement
  • Estimation/assumption of approximately 250cc/min in a healthy person


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