Irregular-

  1. Atrial fibrillation
  2. Atrial flutter or atrial tachycardia with variable conduction
  3. MAT

Regular-

  1. P waves are more than QRS complexes
    1. Atrial flutter
    2. Atrial tachycardia
  2. 1:1 relation of P and QRS
    1. Short PR- atrial tachycardia, atypical AVNRT, PJRT
    2. Short RP- AVRT (RP > 70 ms), AVNRT (RP < 70 ms)
  3. P not seen- AVNRT