End-systolic volume
End-systolic volume
End-systolic volume (ESV) (pronunciation: /ɛnd-sɪˈstɒlɪk ˈvɒl.juːm/) is a term used in cardiology to describe the volume of blood in the ventricle at the end of contraction (systole) and the beginning of filling (diastole).
Etymology
The term is derived from the Greek words "end" meaning "inside", "systole" meaning "contraction", and "volume" referring to the space occupied by a substance.
Definition
End-systolic volume is the amount of blood left in the left ventricle after systole, the contraction phase of the cardiac cycle. This volume is usually measured in milliliters (ml) and can be used to calculate other important cardiac parameters such as stroke volume and ejection fraction.
Related Terms
- Cardiac cycle: The sequence of events that occur when the heart beats.
- Ventricle: One of two large chambers in the heart which collect and expel blood received from an atrium towards the peripheral beds within the body and lungs.
- Stroke volume: The amount of blood pumped by the left ventricle of the heart in one contraction.
- Ejection fraction: A measurement, expressed as a percentage, of how much blood the left ventricle pumps out with each contraction.
See Also
External links
- Medical encyclopedia article on End-systolic volume
- Wikipedia's article - End-systolic volume
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