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| How
to get an LV Mass. |
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| Step
1: Obtain the LVSAX view in Diastole. The optimal
view is the mid transgastric LVSAX view. |
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| Step
2: Measure the PWT, SWT, and LVID. The Posterior
Wall Thickness (PWT) + Septal Wall Thickness (SWT)
and the Left Ventricular Internal Diameter (LVID),
when added together represent the total distance
across the heart. The total distance is cubed
and multiplied by 0.8, a correction factor to get
the total volume of the heart. Similarly, the
Left Ventricular Internal Diameter (LVID) is cubed
and multiplied by 0.8 to reveal the internal (non
muscular) volume of the heart. The difference
between the two values represents the volume of the
cardiac muscle of the heart. The volume of the
muscle is multiplied by the specific gravity (1.06)
and a correction factor 0.6 grams is added to reveal
the mass of the left ventricle. |
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| Step
3: Enter the Data to calculate the LV Mass.
The RVIO view is useful for measuring the RVOT diameter.
Under zoomed conditions, use the trackball-calipers
function to measure the RVOT diameter. |
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| LV
Mass = 0.8 {SG ( PWT + SWT + LVID)3
- LVID3} + 0.6g |
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