ECG
Irregular tachycardia (>100 bpm)
At least 3 distinct p wave morphologies with different P-R intervals
No dominant pacemaker site
BMP, Magnesium
Hemoglobin/hematocrit
Consider infectious disease work up
Consider ABG/VBG
Irregular tachycardia (>100 bpm)
At least 3 distinct p wave morphologies with different P-R intervals
No dominant pacemaker site
Multifocal atrial tachycardia
Regular
Wandering atrial pacemaker
AV Node Independent
Wide-complex tachycardia
Sinus tachycardia
Narrow-complex tachycardia
Atrial tachycardia 