Management of Atrial Fibrillation in the Emergency Department

Initial Assessment

The American College of Cardiology recommends evaluating hemodynamic stability by checking for signs of shock, hypotension, acute heart failure, angina, or myocardial infarction in patients presenting to the emergency department with atrial fibrillation 1, 2
Identify potential reversible causes of atrial fibrillation, such as thyroid dysfunction, electrolyte abnormalities, alcohol consumption, and infection 3
Determine the duration of atrial fibrillation, if known, as this guides management decisions, with durations less than 48 hours or greater than 48 hours/unknown duration having different treatment approaches 1, 2

The American College of Cardiology recommends immediate electrical cardioversion without waiting for anticoagulation in hemodynamically unstable patients with atrial fibrillation 1, 2
Administer heparin concurrently, if not contraindicated, via an initial IV bolus followed by continuous infusion to achieve an activated partial thromboplastin time (aPTT) 1.5-2 times the control value 2, 4
After stabilization, initiate oral anticoagulation with a target international normalized ratio (INR) of 2-3 for at least 3-4 weeks 2, 4

First-line agents for rate control in atrial fibrillation include IV beta-blockers or calcium channel blockers, such as verapamil or diltiazem, as recommended by the American College of Cardiology 1, 5
Combination therapy with digoxin plus a beta-blocker or calcium channel antagonist may be considered for better rate control at rest and during exercise 1, 5
Avoid using digoxin as the sole agent for rate control in paroxysmal atrial fibrillation 1, 5

For atrial fibrillation with accessory pathway conduction, pharmacological cardioversion options include IV procainamide, ibutilide, or amiodarone, as recommended by the American College of Cardiology 1, 5

Administer antithrombotic therapy to all atrial fibrillation patients except those with lone atrial fibrillation, as recommended by the American College of Cardiology 1, 6
For atrial fibrillation lasting more than 48 hours or of unknown duration, anticoagulate for at least 3-4 weeks before and after cardioversion with a target INR of 2-3 1, 2
An alternative approach is to perform transesophageal echocardiography (TEE) to rule out left atrial thrombus before cardioversion 1, 4
Higher intensity anticoagulation with a target INR of 2.5-3.5 is recommended for patients with prosthetic heart valves, prior thromboembolism, or persistent atrial thrombus 2, 6

Admission criteria include hemodynamic instability, new-onset heart failure, acute coronary syndrome, as indicated by the American College of Cardiology 2

Failing to identify and treat reversible causes of atrial fibrillation, such as thyroid dysfunction or electrolyte abnormalities, as emphasized by the American College of Cardiology 3
Omitting anticoagulation in high-risk patients with atrial fibrillation, as recommended by the American College of Cardiology 1, 6
Attempting cardioversion without appropriate anticoagulation in patients with atrial fibrillation lasting more than 48 hours, as cautioned by the American College of Cardiology 1, 2