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Ablation and Heart Function
I think you are right. An EF=20-25% (about 1/3 of normal heart function) is low enough that you would not be able to exercise at those levels. It is not unusual with your rhythm under control that your heart function would improve, especially if you have recovered from this (viral?) "cardiomyopathy". However, the cardiac illness that you were treated for may still have some active components and thus the possibility of worsening. The best and simplest way to judge this is with serial cardiac ECHOs. Ultimately, an ECHO is only a snapshot of what happens at that precise moment, and thus changeable under different circumstances. I would ask for a stress ECHO.
You can read more about ablation and stress ECHOs here:
Hope this helps,
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