Cardiac Output Calculator

This calculator relies on established physiological equations. First, Body Surface Area (BSA) is determined using the Mosteller or Du Bois adaptations, commonly modeled as BSA = 0.007184 × weight^0.425 × (height × 100)^0.725. Cardiac output can then be evaluated through the Fick principle or indexed to patient size via Cardiac Index (CI), defined as Cardiac Output divided by BSA. Furthermore, arterial oxygen content (CaO2) and mixed venous oxygen content (CvO2) are calculated using hemoglobin levels, oxygen saturation, and partial pressures of oxygen to accurately model tissue oxygenation dynamics.

Consider an adult patient with a height of 175 cm, a weight of 70 kg, a hemoglobin concentration of 14 g/dL, an arterial oxygen saturation of 98%, and a mixed venous oxygen saturation of 75%. First, we calculate the Body Surface Area: BSA = 0.007184 × 70^0.425 × 175^0.725, which equals approximately 1.83 m². Next, utilizing baseline oxygen consumption constants and oxygen content formulas (CaO2 and CvO2), the calculator determines the arterial-venous oxygen difference. Through these parameters, the tool instantly outputs a Cardiac Output of roughly 5.2 liters per minute and a corresponding Cardiac Index of 2.8 L/min/m², indicating healthy resting systemic perfusion.

Always ensure your height and weight inputs use the correct metric units (centimeters and kilograms) to prevent severe scaling errors in BSA estimation. When dealing with specialized blood gas parameters like hemoglobin or oxygen saturations, verify that lab values are drawn from simultaneous arterial and mixed venous blood samples to maintain calculation validity. Remember that this calculator serves as an educational and supportive reference tool and should never replace formal clinical judgment or invasive hemodynamic monitoring in emergency settings.