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Shannon, I found this bit of information, not sure if it applies to you, but agree with Kristen that any possible reason for the drop in heart function needs to be explored. Hope you can get to the bottom of this.
"...Remember that with this test, images that are taken during irregular beats are rejected. That's why patients with multiple odd ventricular beats like PVCs require longer scan times to gather enough "good data." MUGA is not suited for patients with a really irregular heart rhythm. Echo has the same problem but not as badly."
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