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…..