1. Atrial premature beat

2. Atrial paroxysmal tachycardia-onset in middle of record

3. Atrial flutter-2 1 and 3 1 atrial to ventricle rhythm

4. Atrial fibrillation

5. Ventricular paroxysmal tachycardia

6. Ventricular fibrillation

7. Premature ventricular contractions (PVCs)

8. sinus tachy

9. 1st degree H block prolonged PR

10. 2nd degree H block dropped beat

11. complete H block

12. sinus arrthmia recorded cardiometer

13. sinoatrial nodal block

15. Circus movement, showing annihilation of the impulse in the short pathway and continued propagation of the impulse in the long pathway.

16. Development of arrhythmias in long QT syndrome (LQTS

17. Initiation of fibrillation

18. Pathways of impulses in atrial flutter and atrial fibrillation

19. Application of electrical current to the chest to stop ventricular fibrillation