How do you calculate stroke volume?

In cardiovascular physiology, stroke volume (SV) is the volume of blood pumped from one ventricle of the heart with each beat. It is calculated by subtracting the volume of blood in the ventricle at the end of a beat (called end-systolic volume) from the volume of blood just prior to the beat (called end-diastolic volume). The term stroke volume applies equally to both left and right ventricles of the heart. These two stroke volumes are generally equal, both approximately 70 ml in a healthy 70-kg man.

Stroke volume is an important determinant of cardiac output, which is the product of stroke volume and heart rate. Because stroke volume decreases in certain conditions and disease states, stroke volume itself correlates with cardiac function.

What is the Stroke volume?
The amount of blood pumped by the left ventricle of the heart in one contraction. The stroke volume is not all of the blood contained in the left ventricle. The heart does not pump all the blood out of the ventricle. Normally, only about two-thirds of the blood in the ventricle is put out with each beat. What blood is actually pumped from the left ventricle is the stroke volume and it, together with the heart rate, determines the cardiac output, the output of blood by the heart per minute.

Stroke Volume/Index (SV/SVI):
Stroke volume is the amount of blood the left ventricle ejects in one beat,
measured in milliliters per beat (ml/beat). SV can be indexed to a patient's body size by dividing by Body Surface Area (BSA) to yield Stroke Index (SI).
Cardiac Output/Index (CO/CI):
CO is the amount of blood the left ventricle ejects into the systemic circulation in one minute, measured in liters per minute (l/min). To get CO, multiply Stroke Volume (SV) by Heart Rate (HR). CO can be indexed to a patient's body size by dividing by Body Surface Area (BSA) or afterload to yield Cardiac Index (CI).
Systemic Vascular Resistance/Index (SVR/SVRI):
SVR is representative of the force that the left heart must pump against in order to deliver the stroke volume into the periphery. SVR is directly proportional to blood pressure and indirectly proportional to blood flow (CO).
SVR is determined by the following equation:
SVR = [(MAP - CVP) / CO] x 80
SVR can be indexed to a patient's body size by substituting Cardiac Index for Cardiac Output to yield Systemic Vascular Resistance Index (SVRI).
SVR = [(MAP - CVP) / CI] x 80

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