The Revitive is the most well known brand of a group of products in the category of the so-called circulation boosters. They provide an electrical stimulation to the muscles in the foot to get muscles to contract which is claimed will increase the circulation. Atrial fibrillation is an irregular, often rapid heart rate that commonly causes poor blood flow. The Revitive circulation booster if used as instructed by the manufacturer should not be an issue if you have atrial fibrillation. You should not use it if you have an implanted device to help your heart rhythm. If you are concerned, then you should check with your doctor to get clearance.
The Revitive circulation booster will not help atrial fibrillation. There are certainly more than enough questions that products in the category of circulation boosters can even improve the circulation.