Initial Management of Atrial Fibrillation

Initial Assessment

The American College of Cardiology recommends performing an electrocardiogram to confirm atrial fibrillation diagnosis, assess ventricular rate, and identify underlying structural abnormalities 2
Obtain a transthoracic echocardiogram to identify valvular heart disease, left atrial size, left ventricular function, and potential structural abnormalities 2
Complete blood tests for thyroid, renal, and hepatic function to identify potential reversible causes 2

Assess stroke risk using the CHA₂DS₂-VA score to guide anticoagulation decisions 2
Initiate oral anticoagulation for all eligible patients with a CHA₂DS₂-VA score ≥2 2
Choose direct oral anticoagulants (DOACs) such as apixaban, dabigatran, edoxaban, or rivaroxaban over vitamin K antagonists (VKAs) except in patients with mechanical heart valves or mitral stenosis 2

For patients with preserved ejection fraction (LVEF >40%), administer beta-blockers or non-dihydropyridine calcium channel antagonists (diltiazem, verapamil) as first-line therapy 2
Digoxin is only effective for rate control at rest and should only be used as a second-line agent 1
The following drugs are recommended for their demonstrated efficacy in rate control during exercise and while at rest: atenolol, metoprolol, diltiazem, and verapamil 1

Consider rhythm control strategy for symptomatic patients or those with new-onset atrial fibrillation 2
Both direct-current cardioversion and pharmacological conversion are appropriate options for patients who elect to undergo acute cardioversion 1
Ensure therapeutic anticoagulation for at least 3 weeks before scheduled cardioversion if atrial fibrillation duration is >24 hours or unknown 2

For patients with AF and COPD, use non-dihydropyridine calcium channel antagonists and avoid beta-blockers if active bronchospasm is present 3
For patients with AF and acute coronary syndrome, use intravenous beta-blockers if no contraindications exist 3

Most patients converted to sinus rhythm from atrial fibrillation should not be placed on rhythm maintenance therapy since the risks outweigh the benefits 1

Consider catheter ablation as a second-line option if antiarrhythmic drugs fail to control atrial fibrillation 2