The document discusses the cardiac cycle, which refers to the sequence of changes in pressure, volume, and flow that occur in the heart chambers between each heartbeat. It has a duration of 0.8 seconds. The cardiac cycle consists of systole and diastole. Systole includes the isovolumetric contraction phase lasting 0.05 seconds and the ejection period lasting 0.22 seconds. Diastole includes the protodiastole phase lasting 0.04 seconds, isovolumetric relaxation phase lasting 0.08 seconds, rapid filling phase lasting 0.11 seconds, and slow filling phase lasting 0.19 seconds. The document also discusses the correlation between the cardiac cycle and jugular venous pressure, ECG changes,

1. Cardiac cycle
By
Dr. K. Ambareesha .,PhD (Med Physio)
Department of Physiology
MNR Medical College

2. CONTENTS
1 Definition of Cardiac Cycle
2 Events of Cardiac cycle
3 Cardiac Cycle correlation with JVP
4 ECG changes during cardiac cycle
5 Heart sounds

3. Definition of Cardiac cycle
The sequence of changes in
pressure vise, volume vise
flow vise in the heart
chambers between beat to
beat is called cardiac cycle
Duration = 0.8 sec

5. Events of Cardiac cycle

6. Cardiac cycle & its correlation

7. DURATION OF CARDIAC CYCLE
SYSTOLE
1. Isovolumetric Contraction - 0.05 Sec.
2. Ejection period - 0.22 Sec.
-----------
0.27 Sec.
-----------
DIASTOLE
1. Protodiastole - 0.04 Sec.
2. Isovolumetric relaxation - 0.08 Sec.
3. Rapid filling - 0.11 Sec.
4. Slow filling - 0.19 Sec.
5. Atrial Systole - 0.11 Sec.
-------------
0.53 Sec
The total duration of cardiac cycle is 0.27 + 0.53= 0.8 Second.

9. ATRIAL SYSTOLE
4-6
7-8

10. ATRIAL SYSTOLE
4-6
7-8

11. VENRTICULAR SYSTOLE
a. Isovolumetric Contraction - 0.05 Sec.

12. VENRTICULAR SYSTOLE
b. Ejection period - 0.22 Sec

15. VENTRICULAR DIASTOLE
a. Protodiastole - 0.04 Sec

16. VENTRICULAR DIASTOLE
b. Isovolumetric relaxation - 0.08 Sec

17. VENTRICULAR DIASTOLE
b. Isovolumetric relaxation - 0.08 Sec

18. VENTRICULAR DIASTOLE
c, d Rapid filling & slow filling

19. CARDIAC CYCLE IN RELATION WITH JVP

20. CARDIAC CYCLE IN RELATION WITH JVP

21. CARDIAC CYCLE IN RELATION WITH JVP

22. ECG CHANGES DURING CARDIAC
CYCLE

23. ECG CHANGES DURING CARDIAC
CYCLE

24. HEART SOUNDS

26. HEART SOUNDS

27. HEART SOUNDS

30. HEART SOUNDS

31. In life when you get troubles, don’t get nervous….
Just close your eyes and follow your heart, because
heart may be left, but it is always right…..