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.
1 4 diseases that are very common. 2  6 diseases that are common. 3  1 disease that is uncommon. 4  3 diseases that are very rare. 5  72 diseases without any prevalence information. 6  The following drugs, medications, substances or toxins may possibly cause Atrial fibrillation as a side effect.he following causes of Atrial fibrillation are diseases or medical conditions that affect more than 10 million people in the USA: 1  Coronary heart disease. 2  Diabetes Mellitus. 3  Hypertension, systemic. 4  Ischaemic heart disease. 5  more causes...Â».