Preload And Afterload

Preload And Afterload


Preload is also called as the left ventricular end diastolic pressure is the amount of stretch of the ventricle at the end of diastole. Preload is the volume of blood left at the end of diastole and it stretches the LV to its maximum under normal physiological conditions. You can relate it to a balloon when you blow air into the balloon, it stretches, same as heart while we blow blood in during diastole.


Afterload is also called as systemic vascular resistance and it is the pressure overcome by the heart to eject the blood during systole. Alternatively we can say, it is the vascular resistance, overcome by the heart to open the aortic valve, to pump blood into the systemic circulation.

preload and afterload

Medical Disclaimer:

The information provided on this website ( is only for educational purpose and is Copyrights Protected.

While we tried hard to write quality articles but still, the articles and the information within them is not guaranteed to be free of factual errors or typos and hence may not be correct. You are advised to independently verify the claims in the articles and make your own conclusion.