Fick Principle Cardiac Output Calculator

This calculator is designed for healthcare professionals to compute cardiac output using the Fick principle, a critical measurement for assessing heart function.

Calculator

Oxygen Consumption (VO2 in mL/min) *

Arterial Oxygen Content (CaO2 in mL O2/L) *

Venous Oxygen Content (CvO2 in mL O2/L) *

Results

Cardiac Output:

Data Source and Methodology

All calculations are strictly based on the Fick principle as outlined in the standard cardiology texts. For more information, refer to MDCalc.

The Formula Explained

The cardiac output is calculated using the formula:

\[ \text{Cardiac Output} = \frac{\text{VO2}}{\text{CaO2} - \text{CvO2}} \]

Glossary of Variables

VO2: Oxygen consumption in milliliters per minute.
CaO2: Arterial oxygen content in milliliters of oxygen per liter of blood.
CvO2: Venous oxygen content in milliliters of oxygen per liter of blood.

How It Works: A Step-by-Step Example

To calculate cardiac output, input the VO2, CaO2, and CvO2. For example, with a VO2 of 250 mL/min, CaO2 of 200 mL/L, and CvO2 of 150 mL/L, the cardiac output is:

\[ \text{Cardiac Output} = \frac{250}{200 - 150} = 5 \text{ L/min} \]

Frequently Asked Questions (FAQ)

What is the Fick principle?

The Fick principle is a method used to measure cardiac output based on the differential uptake of oxygen across the pulmonary circulation.

Why is cardiac output important?

Cardiac output is a crucial indicator of heart performance and overall cardiovascular health.

How do I ensure accurate measurements?

Ensure accurate data input and use standardized equipment for measuring oxygen consumption and content.

Can this calculator be used for pediatric patients?

Yes, but ensure to use pediatric-specific normative values for VO2, CaO2, and CvO2.

Are there any units to be aware of?

Yes, ensure that all inputs are consistent in terms of units, primarily using mL/min for VO2 and mL O2/L for oxygen contents.

Tool developed by Ugo Candido. Content reviewed by medical experts. Last reviewed for accuracy on October 1, 2023.