Oxygenation Calculator
Calculate various oxygenation parameters.
Input Parameters
Enter patient and circuit data.
Oxygen Content, Delivery (DO₂), and Consumption (VO₂) Physiology
Physiological Principles & Clinical Context
The fundamental goal of cardiopulmonary perfusion is to match oxygen supply (delivery) with systemic tissue metabolic demand (consumption). Arterial oxygen content (CaO₂) is determined by hemoglobin concentration and oxygen saturation, with a tiny fraction dissolved in plasma. Oxygen delivery (DO₂) is the product of pump flow rate and CaO₂, while oxygen consumption (VO₂) is calculated from the arterial-venous oxygen content difference (Fick principle). Maintaining a healthy balance prevents systemic lactic acidosis and organ dysfunction.
Clinical Targets & Safe Ranges
- •Absolute DO₂ Range: 800 to 1000 mL/min for average resting adult.
- •Indexed DO₂I Target: 270 to 330 mL/min/m² on cardiopulmonary bypass.
- •Absolute VO₂ Range: 150 to 250 mL/min under resting conditions.
- •DO₂/VO₂ Safety Ratio: Maintain above 4.0 to 5.0 (Ratios below 2.0 indicate systemic oxygen debt and lactic acidosis).
Mathematical Formulation
- ƒArterial Oxygen Content: CaO₂ (mL/dL) = [ Hgb (g/dL) × 1.34 × (SaO₂/100) ] + [ PaO₂ (mmHg) × 0.003 ]
- ƒVenous Oxygen Content: CvO₂ (mL/dL) = [ Hgb (g/dL) × 1.34 × (SvO₂/100) ] + [ PvO₂ (mmHg) × 0.003 ]
- ƒAbsolute Oxygen Delivery: DO₂ (mL/min) = Blood Flow (L/min) × CaO₂ (mL/dL) × 10
- ƒAbsolute Oxygen Consumption: VO₂ (mL/min) = Blood Flow (L/min) × (CaO₂ - CvO₂) × 10
- ƒDO₂/VO₂ Ratio: Ratio = DO₂ / VO₂
Academic & Clinical References
- Ranucci M, Romitti F, Isgrò G, et al. Oxygen delivery, hematocrit, and acute kidney injury during cardiopulmonary bypass. Ann Thorac Surg. 2005;80(6):2182-2189.
- De Somer F, Mulholland JW, Bryan MR, et al. O₂ delivery and CO₂ production during cardiopulmonary bypass as determinants of acute kidney injury: time for a goal-directed perfusion protocol? J Extra Corpor Technol. 2011;43(1):12-17.
Medical Disclaimer
This application is intended for educational and reference purposes for qualified perfusionists and cardiac surgical professionals. The clinical information and calculations provided should not substitute for professional clinical judgment or institutional protocols. Always verify results with independent calculations and equipment. Perfi does not assume liability for clinical decisions made based on this software.