“Atrial fibrillation is the most common type of abnormal heart rhythm. Nearly 4 million emergency room visits from 2007 to 2014 in the United States were for atrial fibrillation. An estimated 2 million people in the U.S. have A-fib Complications arising from afib vary from Cardumyopathy to CVA (stroke), Low B/P,  CHF and more.”.

Cleveland Clinic (https://my.clevelandclinic.org/health/diseases/24578-atrial-fibrillation-with-rvr)