Pacers are implanted for different reasons, which I think makes your question a bit complicated.
Often people take beta blockers after a pacer device implant, and if you are taking a beta blocker, grapefruit is not a recommended food to mix in your diet. If you are taking a drug to remove excess fluid caused by Congestive Heart Failure, foods high in potassium may or may not be recommended. Certainly, foods high in salt should generally be avoided.
If you can manage it, I'd suggest you contact a dietician, and discuss the issue based on your cardiac history as well as what medications you are prescribed. Thanks for bringing up an interesting topic.
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