AEG: Depending on the rate and the AV nodal conduction, there can be either a 1:1 atrial to ventricular ratio or a more atrial signals than ventricular signals. As AET is an automatic rhythm, it is more like to be slower and often demonstrates a ramping up and down of the rate, exhibiting more rate variability than reentrant rhythms such as atrial flutter (IART). The P wave appearance can provide insight to the source of the arrhythmia within the atria, though AET may appear similar to the sinus tachycardia if originating from a site close to the sinus node.
Adenosine: Though AET is generally not converted with adenosine, it can occasionally slow or terminate. Therefore, the response to adenosine is non-diagnostic.
Atrial Overdrive Pacing: AET can be suppressed with overdrive pacing, though the AET often resumes once pacing is stopped.