Paroxysmal ventricular tachycardia:
1.Paroxysmal ventricular tachycardia ≤ 120 bpm.
2.P-waves are absent.
3.QRS-complexes are wide and irregular.
Atrial fibrillation and flutter:
1.Atrial fibrillation - more than 400 P-waves per min, QRS-frequency of 150-180 bpm, f-waves
2.Atrial flutter atrial frequency is about 300 bpm, sawtooth-like P-waves
Atrial fibrillation:
Atrial flutter: