Enter the left ventricular internal dimension at end-diastole (LVIDd) into the calculator to determine the left ventricular ejection fraction (LVEF) using the Teichholz formula.
Teichholz Formula
The Teichholz formula is used to estimate the left ventricular ejection fraction (LVEF) from the left ventricular internal dimension at end-diastole (LVIDd). The formula is as follows:
text{LVEF} = left( frac{7.0}{(2.4 + text{LVIDd})} right) times text{LVIDd}^3 times 100%
Variables:
- LVEF is the left ventricular ejection fraction (%)
- LVIDd is the left ventricular internal dimension at end-diastole (cm)
To calculate LVEF using the Teichholz formula, you need to measure the LVIDd during an echocardiogram and then apply the formula to estimate the ejection fraction.
What is the Teichholz Formula?
The Teichholz formula is a mathematical equation used in cardiology to estimate the left ventricular ejection fraction (LVEF), which is a measure of the percentage of blood leaving the heart each time it contracts. The LVEF is an important diagnostic tool in assessing heart function, particularly in patients with heart disease. The Teichholz formula is based on measurements taken from an echocardiogram, specifically the left ventricular internal dimension at end-diastole (LVIDd).
How to Calculate LVEF Using the Teichholz Formula?
The following steps outline how to calculate the left ventricular ejection fraction using the Teichholz formula.
- First, measure the left ventricular internal dimension at end-diastole (LVIDd) in centimeters during an echocardiogram.
- Next, apply the Teichholz formula: LVEF = (7.0 / (2.4 + LVIDd)) * LVIDd^3 * 100%.
- Finally, calculate the left ventricular ejection fraction (LVEF) as a percentage.
- Use the calculator above to verify your results.
Example Problem:
Use the following variable as an example problem to test your knowledge.
Left ventricular internal dimension at end-diastole (LVIDd) = 5.0 cm
