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.
Atrial fibrillation, a common heart rhythm disorder, is usually caused by abnormalities or changes to your heart's structure. Your risk of developing atrial fibrillation increases with age.Atrial fibrillation may sometimes be inherited.This type of atrial fibrillation, called familial atrial fibrillation, has been associated with changes in certain genes in a small number of inherited cases.our risk of developing atrial fibrillation increases with age. Atrial fibrillation may sometimes be inherited. This type of atrial fibrillation, called familial atrial fibrillation, has been associated with changes in certain genes in a small number of inherited cases.