Table 1. Etiologies of Atrial Fibrillation
1. Atrial pressure elevation (leading to dilatation)
    Valvular disease: mitral/tricuspid regurgitation or stenosis,
    mitral valve prolapse
    Systolic or diastolic dysfunction
    Hypertrophic cardiomyopathy (HCM)
    Pulmonary hypertension (COPD with cor pulmonale)
    Pulmonary embolism
    Intracardiac thrombi or tumor
2. Inflammatory and infiltrative process
    Age induced atrial fibrosis
3. Infectious process
    Any infections and fever
4. Endocrine disorders
5. Neurogenic
    Subarachnoid hemorrhage
6. Atrial ischemia
    Myocardial infarction
7. Drugs
    Alcohol (holiday heart)
8. Idiopathic
    Lone afib if less than 60 years old
9. Familial