Your 79 year old patient, Betty, comes to the clinic complai…
Your 79 year old patient, Betty, comes to the clinic complaining of palpitations and irregular fast pulse on an intermittent basis for about a week, sometimes lasting for 30-40 minutes at a time. She feels short of breath when it occurs, but feels fine at the time of your visit this morning. You are most concerned your patient has which of the following diagnoses: