I will be on Ibrutinib 2 years in July. I went to the ER the other day for Atrial Flutter in my chest. I've been having it for about a month and it got worse on a Sat so I went to the ER. I have PACS. Premature Atrial Contractions. They said they can be a precursor to Atrial Fibrilation. I know A-Fib can be a side effect of Ibrutinib. Does anyone else have this same issue?