Left Ventricular End Diastolic Volume
| Teichholz Formula | Spherical Formula | |
|---|---|---|
| End-Diastolic Volume: |
Measuring LV volumes on TEE?
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How to calculate Left Ventricular End Diastolic Volume.
- Measure the left ventricular diameter in end-diastole. Do not measure based upon the image end-systole or end-diastole.
Position the frame where the mechanical end-diastole occurs on the ECG (below).
The optimal view for measuring the left ventricular diastolic area is the left ventricular short axis view from the mid transgastric acoustic window. This view has been shown to be predictive of the LVEDV. The area is converted into left ventricular end-diastolic volume.
The formula used is the Teichholz formula which is based upon the spherical volume of the heart multiplied by a correction factor. Since the volume of a sphere is the cube of the radius, and the left ventricle is almost a sphere, a correction factor to account for the non spherical qualities of the left ventricle yields a surprisingly accurate result.
LV Volume = [7/(2.4 + LVID)] * LVID3
RWMA, either close or distant, may cause the volume analysis to be incorrect. If the endocardial border is poorly seen, then the area of the left ventricular cavity may be inaccurate. Failing hearts (i.e. cardiomyopathy) tend to be more spherical than normal hearts so the spherical formula may be more accurate.