The doppler echo cardiac output calculator takes lvot vti, lvotdiameter, heart rate, height and weight and returns cross sectional area of lvot, body surface area and cardiac output. It is built for quick answers, for checking somebody else’s arithmetic, and for the moments when a formula book is not within reach.
What Is the Doppler Echo Cardiac Output Calculator?
The doppler echo cardiac output calculator gives you an estimate of cross sectional area of lvot, body surface area and cardiac output based on lvot vti, lvotdiameter, heart rate, height and weight.
It is a quick reference figure rather than a diagnosis, and it is most useful for tracking how a number moves over time rather than for interpreting a single reading.
How the Doppler Echo Cardiac Output Estimate Is Worked Out
The calculation follows published reference relationships, so it is a reasonable approximation when the inputs are accurate. It assumes an average adult and does not account for individual variation.
If you are comparing two people, or the same person over a period of weeks, keep the method and the inputs identical. A change in the method can easily look like a change in the person.
What This Calculator Does Not Do
It does not diagnose anything, and it does not replace advice from a clinician. If a figure comes out at an extreme, or if it differs sharply from what you expect, that is a reason to speak to a professional rather than to adjust the inputs.
Nothing you type here is stored or sent anywhere. The whole calculation happens in your browser.
A Worked Example
Working through an example, with lvot vti set to 10, lvotdiameter set to 5, heart rate set to 2, the calculator returns body surface area of 0.52705, and cross sectional area of lvot of 19.63495, and stroke volume of 196.34954. Substitute your own figures and the same steps produce the same kind of answer.
Frequently Asked Questions
What do I need to work out cross sectional area of lvot?
Enter lvot vti, lvotdiameter, heart rate, height and weight. The calculator then works through the relationship and reports cross sectional area of lvot, body surface area and cardiac output.
What does the doppler echo cardiac output actually calculate?
It takes lvot vti, lvotdiameter, heart rate, height and weight and converts them into cross sectional area of lvot, body surface area and cardiac output using the standard relationship for this problem. Each step is applied in turn, so every output is traceable back to the numbers you typed in.
How should I enter lvot vti?
Use the value you actually have, in the unit shown next to the field. Enter every value in the same unit system. The calculator assumes the figures you supply are consistent, so it cannot correct a mistake that happens before the calculation starts.
Do I have to fill in every field?
Only the fields a particular result depends on. If you leave one blank, the results that need it simply show a note instead of a number, and everything else still works.
Does anything you type get stored?
No. The whole calculation runs inside your browser, and nothing you enter is uploaded, logged or sent anywhere.