Atrial fibrillation (also called AF or A Fib) is the most common form of arrhythmia (heart rhythm disorder). It affects many people,
including an estimated 2.3 million people in the United States. Atrial fibrillation
is more common in older people, people with high blood pressure, and people
with other kinds of heart disease. It can lead to serious health problems
such as stroke, fatigue, and heart failure. The August 27, 2003, issue of JAMA includes an article about atrial fibrillation.