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Mitral
Valve Area
by PISA |
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How
to get an MVA by PISA. |
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Step
1: Obtain a Zoomed CFD of the MV in the mid esophageal
view. If there is a sufficiently stenosed mitral
valve, a PISA formation will occur. The distance
from the center of the PISA formation to it's first
aliasing velocity edge (where the color shifts from
blue to red) is the radius of the PISA formation.
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Step
2: Note the aliasing velocity. The aliasing
velocity is the velocity where if the flow exceeds
this velocity the flow will be displayed with colors
from the opposite scale. |
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Step
3: Obtain a continuous wave doppler (CWD) of the
mitral valve. The CWD of the mitral valve
will yield a flow profile where, utilizing the calipers
(or you can trace it) to show the peak velocity. |
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Step
4: Obtain an angle of the PISA formation: The
angle at the mitral valve is typically 120 degrees,
whereas the angle for the aortic valve (for aortic
stenosis calculations) is typically 180 degrees. |
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0.1194 seconds.
| © Copyright 2008 JLS Interactive, LLC |
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