#1: What is this patients ejection fraction (estimate please)?
#2: Is it accurate?
Explanation:
This scan is a M Mode scan of the left ventricle short
axis. The endocardial walls are easily visible so the ejection
fraction (> 50% in this case) is easily calculated.
The
ejection fraction from a M Mode scan of the LV SAX view is very
accurate in most cases except where remote wall motion abnormalities
are present.
However, even in the presence of remote wall
motion abnormalities, this calculation is fairly accurate because all
of the coronary arteries supplied myocardium are present in this view
and significant remote wall motion is unlikely.
About the only
serious wall motion abnormality that would make this scan inaccurate
would be a distal LAD lesion where the whole apex is akinetic or
dyskinetic thereby decreasing the ejection fraction signficantly.
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