How long should a patient whose cardiac chambers show no evidence of enlargement remain on antiarrhythmic and anticoagulation medications after conversion from atrial fibrillation flutter to sinus rhythm?
—NELSON C. YU, MD, Baxter, Ky.

If this was an isolated instance, two weeks will do. If this is a recurrent problem, consideration should be given to continued treatment for an indefinite period of time.
—Peter F. Cohn, MD