Your 72 Year Old Patient Has a Heart Rate of 82

Multiple Choice

Your 72 year old patient has a heart rate of 82 BPM. Analysis of the ECG reveals a totally irregular rhythm with a chaotic appearing baseline preceding each narrow QRS complex. This is likely the result of:

A) early beats arising from the atria.
B) the atria firing at a rate in excess of 350 BPM.
C) an enlarged left atrium.
D) a changing pacemaker site.