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.
An Introduction to the Causes of Atrial Fibrillation. The causes of atrial fibrillation aren't always known, and many people who develop the condition already live a healthy lifestyle and don't have any other health concerns. In most cases, however, the cause is known.Some of the more common atrial fibrillation causes include: 1  Heart problems.2  Surgery.n Introduction to the Causes of Atrial Fibrillation. The causes of atrial fibrillation aren't always known, and many people who develop the condition already live a healthy lifestyle and don't have any other health concerns. In most cases, however, the cause is known.