Coffee overdose?

I ran into a patient once who claimed he managed to go into documented atrial fibrillation after one cup of coffee. Middle-aged, otherwise healthy. He was diagnosed, treated, converted back to NSR.

He didn’t believe the single cup of coffee could have done that. He said his doctors didn’t believe it either. Just a coincidence.

So….some time later, not believing the coffee could have done that, he had the single cup of coffee and went back into atrial fib and needed conversion again.

He had no desire to go for the hat trick. Let’s just say he avoids caffeine.