Which of these interventions is most appropriate by the APN?

A 65 year old male presented for a yearly physical exam with complaints of nausea, trembling and fatigue. A 12 lead ECG revealed new onset atrial fibrillation with a heart rate of 60 beats per minute. Current medications included: Lanoxin (digoxin), Lasix (Furosemide) and Aspirin. The patient stated, “Should I go straight to the ER with the way I am feeling?” Which of these interventions is most appropriate by the APN?Call 911 with a referral to the emergency departmentDiscontinue Lanoxin (digoxin) and admit to the hospital for further diagnostic testsOrder a stat TSH, electrolyte panel, and digoxin levelRefer to a cardiologist immediately