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65% and 62% in echo is the same. It's not a drop. Perhaps your cardiologist told you that.
Echo results could be +/- 5%, depending on...
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Point was that modern mechanical valves may have more tolerance than we probably assume.
In any case, it wasn't too important to...
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The paragraph above the one you tagged provided the context:
Then I wonder what patients in the developing and underdeveloped world do...