DEFINITION of 'Attribution Rules'. A set of rules created by Canada Revenue Agency (CRA) that prevents investors from transferring assets between family members with the intention of avoiding taxes. Next Up.
Causes of atrial fibrillation. The exact cause of atrial fibrillation is unknown, but it's more common with age and affects certain groups of people more than others. Atrial fibrillation is common in people with other heart conditions, such as: 1  high blood pressure (hypertension). 2  atherosclerosis.3  heart valve disease.4  congenital heart disease.auses of atrial fibrillation. The exact cause of atrial fibrillation is unknown, but it's more common with age and affects certain groups of people more than others. Atrial fibrillation is common in people with other heart conditions, such as: 1  high blood pressure (hypertension). 2  atherosclerosis.
the type of atrial fibrillation you have your symptoms ; whether you have an underlying cause that needs to be treated ; The first step is to try to find the cause of the atrial fibrillation. If a cause can be identified, you may only need treatment for this. For example, if you have an overactive thyroid gland (hyperthyroidism), medication to treat it may also cure atrial fibrillation. If no underlying cause can be found, the treatment options are: 1  medicines to reduce the risk of a stroke. 2  medicines to control atrial fibrillation. 3  cardioversion (electric shock treatment) 4  catheter ablation. 5  having a pacemaker fitted.