Cardiac cycle

By

Dr. K. Ambareesha .,PhD (Med Physio)

Department of PhysiologyMNR Medical College

CONTENTS1 Definition of Cardiac Cycle2 Events of Cardiac cycle3 Cardiac Cycle correlation with JVP4 ECG changes during cardiac cycle5 Heart sounds

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

Events of Cardiac cycle

Cardiac cycle & its correlation

DURATION OF CARDIAC CYCLESYSTOLE

1. Isovolumetric Contraction - 0.05 Sec.2. Ejection period - 0.22 Sec.

-----------0.27 Sec.-----------

DIASTOLE1. 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 SecThe total duration of cardiac cycle is 0.27 + 0.53= 0.8 Second.

ATRIAL SYSTOLE

4-6

7-8

ATRIAL SYSTOLE

4-6

7-8

VENRTICULAR SYSTOLE

a. Isovolumetric Contraction - 0.05 Sec.

VENRTICULAR SYSTOLE

b. Ejection period - 0.22 Sec

VENTRICULAR DIASTOLEa. Protodiastole - 0.04 Sec

VENTRICULAR DIASTOLEb. Isovolumetric relaxation - 0.08 Sec

VENTRICULAR DIASTOLEb. Isovolumetric relaxation - 0.08 Sec

VENTRICULAR DIASTOLEc, d Rapid filling & slow filling

CARDIAC CYCLE IN RELATION WITH JVP

CARDIAC CYCLE IN RELATION WITH JVP

CARDIAC CYCLE IN RELATION WITH JVP

ECG CHANGES DURING CARDIAC CYCLE

ECG CHANGES DURING CARDIAC CYCLE

HEART SOUNDS

HEART SOUNDS

HEART SOUNDS

HEART SOUNDS

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…..