The types of arrythmias according to origin: A-atrial arrytmias: 1- atrial tachycardia in which there is multiple waves of PQRST waves repeated. 2-atrial bradycardia there is decrease number of PQRST. 3-atrial flutter(250-350 Beat/minuets) multiple P wave( or called F wave) follow by QRS wave. 4-atrial fibrillation (more than 350 beat/minuets) No p wave (or called f wave)