Findings during electrophysiological study
| Typical atrial flutter (n=13) | Atypical atrial flutter (n=8) | Coarse atrial fibrillation (n=3) | |
| Atrial flutter inducibility (n) | |||
| Continuously present | 4 | 2 | 3 |
| Induced | 3 | 3 | 0 |
| Non-inducible | 6 | 3 | 0 |
| Right atrial activation during atrial flutter (n) | (n=7) | (n=5) | (n=3) |
| Counterclockwise | 7 | 4 | 3 |
| Clockwise | 0 | 1 | 0 |
| Left atrial response during atrial flutter (n) | (n=6) | (n=5) | (n=1) |
| 1:1 | 6 | 5 | 0 |
| Atrial fibrillation | 0 | 0 | 1 |