cvs module phase II MBBS CARDIAC CYCLE PHYSIOLOGY CARDIOVASCULAR MODULE PHASE II

cvs module phase II MBBS INSTRUCTOR INFORMATION Dr AZRA KIRMANI ASSISTANT PROFESSOR DEPARTMENT OF PHYSIOLOGY ROOM NO 951/1 FIRST FLOOR BUILDING 9 EXT MOBIL , RESIDENCE

cvs module phase II MBBS

Events of the cardiac cycle at a heart rate of 75 beats/min Ventricular Diastole 0.5 seconds Ventricular Systole 0.3 seconds Atrial systole 0.1 second Atrial Systole 0.7 seconds

cvs module phase II MBBS Late Diastole

cvs module phase II MBBS Atrial Systole

cvs module phase II MBBS Atrial Systole

cvs module phase II MBBS ATRIAL SYSTOLE ECG

cvs module phase II MBBS ATRIAL SYSTOLE Heart Sounds

cvs module phase II MBBS Atrial systole contributes 30% 0f ventricular filling. The end diastolic ventricular volume is 130ml.

cvs module phase II MBBS Isovolumetric ventricular contraction

cvs module phase II MBBS ISOVOLUMETRIC CONTRACTION ECG

cvs module phase II MBBS ISOVOLUMETRIC CONTRACTION Heart Sounds

cvs module phase II MBBS Ventricular Ejection

cvs module phase II MBBS RAPID EJECTION Pressures & Volumes

cvs module phase II MBBS RAPID EJECTION ECG

cvs module phase II MBBS RAPID EJECTION Heart Sounds

cvs module phase II MBBS REDUCED EJECTION Late in systole, the aortic pressure actually exceeds the ventricular, but for a short period momentum keeps the blood moving forward.

cvs module phase II MBBS REDUCED EJECTION Heart Sounds

cvs module phase II MBBS PROTODIASTOLE Once the ventricular muscle is fully contracted, the already falling ventricular pressures drop more rapidly. This is the period of protodiastole. It lasts about 0.04 s. It ends when the momentum of the ejected blood is overcome and the aortic and pulmonary valves close, setting up transient vibrations in the blood and blood vessel walls.

cvs module phase II MBBS The amount of blood ejected by each ventricle per stroke at rest is mL. The end-diastolic ventricular volume is about 130 mL. Thus, about 50 mL of blood remains in each ventricle at the end of systole (end- systolic ventricular volume). The ejection fraction, the percent of the end-diastolic ventricular volume that is ejected with each stroke, is about 65%. The ejection fraction is a valuable index of ventricular function.

cvs module phase II MBBS Isovolumetric ventricular relaxation

cvs module phase II MBBS ISOVOLUMETRIC RELAXATION

cvs module phase II MBBS ISOVOLUMETRIC RELAXATION ECG

cvs module phase II MBBS ISOVOLUMETRIC RELAXATION Heart Sounds

cvs module phase II MBBS RAPID VENTRICULAR FILLING Heart

cvs module phase II MBBS RAPID VENTRICULAR FILLING Pressures & Volumes

cvs module phase II MBBS RAPID VENTRICULAR FILLING ECG

cvs module phase II MBBS RAPID VENTRICULAR FILLING Heart Sounds

cvs module phase II MBBS REDUCED VENTRICULAR FILLING Pressures & Volumes

cvs module phase II MBBS REDUCED VENTRICULAR FILLING ECG

cvs module phase II MBBS REDUCED VENTRICULAR FILLING Heart Sounds

cvs module phase II MBBS

Events of the cardiac cycle at a heart rate of 75 beats/min 1, atrial systole; 2, isovolumetric ventricular contraction; 3, ventricular ejection; –Rapid ejection –Slow ejection –Protodiastole 4, isovolumetric ventricular relaxation; 5, ventricular filling.

cvs module phase II MBBS Note that late in systole, aortic pressure actually exceeds left ventricular pressure. However, the momentum of the blood keeps it flowing out of the ventricle for a short period.

cvs module phase II MBBS

Right Ventricular & Pulmonary Arterial Pressure

cvs module phase II MBBS

Pressure Volume Relationship