Some genes increase risk of atrial fibrillation.

The risk of emboli forming in idiopathic AF depends on other risk factors such as increasing age, hypertension, diabetes, recent heart failure, or previous stroke.

It is a form of ventricular fibrillation (V Fib), not mechanical damage to the heart muscle or surrounding organs, and not the result of heart disease.

Also, the sub tricuspid region may be difficult to distinguish from the atrioventricular sulcus, which is rich in fat.

The Bainbridge reflex, also called the atrial reflex, is an increase in heart rate due to an increase in central venous pressure.

Differences in the atypical form are the lack of syndactyly, the presence of musculoskeletal problems (particularly hyperflexible joints), and atrial fibrillation.