Also check you magnesium and calcium levels. If you take PPIs you may be deficient in Magnesium since that is one of their side effects. And a magnesium deficiency can cause A-Fib, Atrial flutter and palpitations. How do I know this? Because as a long term user of PPIs my magnesium went low and I got a-fiv and palpitations. Since I now take magnesium chloride in the form of Slo-Mag tablets (available at Wal-Mart) they have gone awaya entirely. But if I stop taking them the palpitations come back.
Did they even measure your magnesium in a blood test. Its not on the normal blood panel so your doc must request it to be added. Also check your calcium, which is on the normal blood panel.
Find out about the magnesium before you have the heart surgery if possible.
Check out these links:
Fifty years with GERD