Table 1

Flutter Wave Polarity in the 12-Lead ECG

Reverse Typical AFLULR
Lead(+)(−)(± or Flat)(+)(−)(± or Flat)p Value
I2501839<0.001
II240217210.295
III232115230.515
aVR224031610.363
aVL1021421170.001
aVF232116310.818
V171458480.064
V211699380.858
V3181714240.612
V4230315320.174
V5250114240.048
V6250115230.103

AFL = atrial flutter; ECG = electrocardiogram; ULR = upper loop re-entry.