I understand that working out with fins increases the HR. Could it possibly cause an Afib episode? At the end of July I ended up in ICU with a HR of 155. Now I'm on medicine that I don't really want to be taking and wonder if it is necessary. And I have had a loop monitor inserted. I think it was stupidity on my part. I had been having some heart racing episodes that I chalked up to anxiety: moving/job change/caffeine. Mentioned it to new family practice doctor. EKG showed nothing. 3 week heart monitor showed nothing. After 3 weeks of no swimming (due to monitor) I hopped in and swam 2,000 then decided to add fins and do another 1,000 alternating fast/easy. Got in the shower and Afib hit. I am now under the care of a good cardiologist BUT he is not a swimmer. I'm trying to make the case that the fins caused the Afib. I've tried googling for information on any connection between race pace swimming with fins - and Afib but couldn't find much. Thoughts?