Final answer:
In this case, the healthcare provider should anticipate initiating a heparin infusion to treat atrial fibrillation.
Step-by-step explanation:
Atrial fibrillation is a condition where the heart beats in a wild, uncontrolled manner, preventing it from pumping effectively. In this case, since the patient has been experiencing atrial fibrillation for the past 3 days, an appropriate order for the healthcare provider would be to anticipate initiating a heparin infusion.
Heparin is an anticoagulant medication that helps prevent blood clots from forming in the heart during atrial fibrillation. By administering heparin, the healthcare provider can reduce the risk of complications such as stroke or heart attack.
Additionally, heparin may also help promote the conversion of atrial fibrillation back to a normal sinus rhythm, as it prevents clot formation and allows the heart to pump more effectively.