Preload
Preload (medicine)
Preload (/priːˈloʊd/) in the field of medicine and more specifically in cardiology, refers to the volume of blood in the ventricle at the end of diastole, just before contraction. The term is often used in discussions about heart failure and cardiovascular physiology.
Etymology
The term "preload" originates from the field of physics, where it is used to describe the initial stretching of a material or system before work is done. In the context of cardiology, it refers to the stretching of the heart muscle before contraction.
Related Terms
- Afterload: The pressure that the heart must work against to eject blood during systole. Afterload is often confused with preload, but they refer to different aspects of the cardiac cycle.
- Cardiac output: The volume of blood the heart pumps per minute. Preload is one of the factors that can affect cardiac output.
- Frank-Starling mechanism: This is the relationship between preload and stroke volume in the heart. According to this mechanism, an increase in preload leads to an increase in stroke volume.
See Also
External links
- Medical encyclopedia article on Preload
- Wikipedia's article - Preload
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