Atrial fibrillation

Question 10 1 / 1 point A 67 year old woman with atrial fibrillation and an ejection fraction of 48% is on digoxin and has had normal digoxin levels of 0.8- 2 ng/dL for the past 9 months. Today, the level is 0.4 ng/dL. What could account for this change? Question options: regular use of an antacid increased exercise weight loss decreased creatinine clearance