Atrial Flutter With 2:1 AV Conduction: Leads II, III, V1-KH
Frank G.Yanowitz, M.D.
In leads II and III, the one of the flutter waves occurs at the end of the QRS complex and might be mistaken for part of the QRS itself; i.e., the S wave. In lead V1, the two flutter waves for every QRS are more easily identified.