Stroke Volume is calculated as which of the following?

Stroke Volume is calculated as which of the following?

• A. SV = LVEDV - LVESV
• B. SV = MAP × CO
• C. SV = EDV - ESV
• D. SV = 0.5 × EDV

Answer: (A)

Stroke volume is the amount of blood the ventricle ejects with each heartbeat. It is determined by how much blood fills the ventricle at the end of diastole and how much remains after systole. In the left ventricle, this difference is expressed as LVEDV minus LVESV. Since EDV and ESV refer to the same left-ventricle volumes, this is equivalent to EDV minus ESV. This direct subtraction captures the actual volume pumped per beat and underpins the relationship with ejection fraction (EF = SV/EDV). The product of mean arterial pressure and cardiac output is not a measure of stroke volume, and there isn’t a standard factor like 0.5 times EDV used to define SV.

Stroke volume is the amount of blood the ventricle ejects with each heartbeat. It is determined by how much blood fills the ventricle at the end of diastole and how much remains after systole. In the left ventricle, this difference is expressed as LVEDV minus LVESV. Since EDV and ESV refer to the same left-ventricle volumes, this is equivalent to EDV minus ESV. This direct subtraction captures the actual volume pumped per beat and underpins the relationship with ejection fraction (EF = SV/EDV). The product of mean arterial pressure and cardiac output is not a measure of stroke volume, and there isn’t a standard factor like 0.5 times EDV used to define SV.