![]() ![]() ![]() Thyroid disease such as an overactive thyroid (hyperthyroidism) and other metabolic imbalances.Problem with the heart's natural pacemaker (sick sinus syndrome).Physical stress due to surgery, pneumonia or other illnesses.Heart defect that you're born with (congenital heart defect).Possible causes of atrial fibrillation include: Problems with the heart's structure are the most common cause of atrial fibrillation. The normal range for a heart rate is 60 to 100 beats a minute. The heart rate in atrial fibrillation may range from 100 to 175 beats a minute. This causes a fast and irregular heart rhythm. The AV node is then bombarded with signals trying to get through to the lower heart chambers (ventricles). As a result, the upper chambers shake (quiver). In atrial fibrillation, the signals in the upper chambers of the heart are chaotic. The movement of the signal causes your heart to squeeze (contract), sending blood to your heart and body.The signal passes through a pathway between the upper and lower chambers called the atrioventricular (AV) node.The signal travels from the sinus node through the two upper heart chambers (atria).It produces the signal that starts each heartbeat. The sinus node is the heart's natural pacemaker. Within the upper right chamber of the heart (right atrium) is a group of cells called the sinus node. The typical heart has four chambers - two upper chambers (atria) and two lower chambers (ventricles). To understand the causes of A-fib, it may be helpful to know how the heart typically beats. ![]() Chest pain could mean that you're having a heart attack. If you have chest pain, seek immediate medical help. If you have any signs or symptoms of atrial fibrillation, make an appointment with your doctor. Medications are needed to control the heart rate and to prevent blood clots. In this type of atrial fibrillation, the irregular heart rhythm can't be restored. This type of atrial fibrillation is continuous and lasts longer than 12 months. If a person has A-fib symptoms, cardioversion or treatment with medications may be used to restore and maintain a normal heart rhythm. With this type of atrial fibrillation, the heart rhythm doesn't go back to normal on its own. Some people with occasional A-fib need treatment. Sometimes symptoms occur for as long as a week and episodes can happen repeatedly. A-fib symptoms come and go, usually lasting for a few minutes to hours.
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