Table 1.
ECG Characteristics of the Various Types of Atrial Tachycardia According to Old and New Classification (Changes between Old and New Classification are Shown in Bold)
| Heart Rate | P‐Wave Morphology | Isoelectric Line | ||||
|---|---|---|---|---|---|---|
| Old Classification | New Classification | Old Classification | New Classification | Old Classification | New Classification | |
| Focal atrial tachycardia | 150–250 bpm | From 100 to >300 bpm | Any | Any | Yes | Yes |
| Typical atrial flutter | 250–350 bpm | From <150 to >300 bpm | II, III, aVF − V1 + | II, III, aVF − V1 + | No | No |
| Reverse typical atrial flutter | 250–350 bpm | From <150 to >300 bpm | II, III, aVF + V1 − | II, III, aVF + V1 − | No | No |
| Lesion macroreentrant atrial tachycardia | / | From 100 to >300 bpm | / | Any | / | Possible |
| Other macroreentrant tachycardias of the right atrium | / | From 100 to >300 bpm | / | II, III, aVF − | / | Possible |
| Left atrial macroreentrant atrial tachycardia | / | From 100 to >300 bpm | / | V1 + | / | Possible |
| Atypical atrial flutter | 250–350 bpm | From 100 to >300 bpm | Any | Any | Yes | No |
| Multifocal atrial tachycardia | ≥100 bpm | / | ≥3 morphologies | / | Yes | / |