심방세동 닷 컴(A-Fib.com) 에서 인용하여 올립니다. What are the Causes of A-Fib? It’s estimated as many as 5.1 million people in the U.S. have A-Fib. By the year 2050, the number will be 12-16 million. Each year there are over 340,000 new cases in the US. A-Fib is the most common heart arrhythmia. In the U.S. people over 40 have a one in four lifetime risk of developing A-Fib. Worldwide the number of cases is es..