| Favorable Conditions for Cardioversion of Atrial Fibrillation |
| Less than 1 year duration of atrial fibrillation |
| No or minimal cardiomegaly |
| Echocardiographic left atrial dimension less than 45 mm |
| After treatment of a precipitating cause such as acute myocardial infarction , cardiac
or thoracic surgery, hyperthyroidism, pneumonia, or pericarditis |
| After corrective valvular surgery |
| stenosis or hypertrophic obstructive cardiomyopathy |
| Unfavorable Conditions for Cardioversion of Atrial Fibrillation |
| Duration of atrial fibrillation greater than 1 year |
| Moderate to severe cardiomegaly |
| Echocardiographic left atrial dimension greater than 45 mm |
| Digitalis toxicity (contraindicated) |
| Chronic obstructive lung disease |
| Mitral valve disease |
| Heart failure |
| Recurrent atrial fibrillation despite antiarrhythmic drugs |
| Inability to tolerate antiarrhythmic drugs |
