jpareyt,
Thanks for the post, and sorry to hear of your
familyBirth control and family planning
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Unfortunately, chances are that the fast heart rate is an appropriate response to your Dad's illness. When we exercise, develop an infection, fever, are scared, or suffer large heart attacks; a natural response is tachycardia (fast heart rate). Slowing down the heart rate without correcting the underlying illness/affliction can be detrimental. Some of the worst mistakes I have seen are when well-meaning doctors slow down the heart rate without properly investigating why it was fast in the first place.
Make sure that a cardiologist, as well as the surgeon, is following your Dad's care. And consider moving him to a large center (if he is not at one) if you don't like what you see.
Best of luck.