Calculating Stroke Volume

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

The stroke volume is an important determinant of cardiac output, which is the product of stroke volume and heart rate. Because the decline in stroke volume in some conditions and disease states, stroke volume correlates with cardiac function.

What is the stroke volume?
The amount of blood pumped by the heart's left ventricle in one contraction. The stroke volume is not all the blood in the left ventricle. The heart does not pump all the blood from the ventricle. Normally, only about two-thirds of the blood in the ventricle with each heartbeat is set. What blood is actually pumped from the left ventricle is the stroke volume and, with heart rate determines 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 body size of a patient by dividing by Body Surface Area (BSA) to produce disease 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 (LPM). For CO, multiply stroke volume (SV) in heart rate (HR). CO can be indexed to body size of a patient by dividing by Body Surface Area (BSA) or assign afterload cardiac index (CI).
The systemic vascular resistance / index (SVR / SVRI)
SVR is representative of the population that the heart has to pump against the left, to deliver the stroke volume to 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 body size of a cardiac patient by substituting the production index for cardiac yield systemic vascular resistance index (SVRI).
SVR = [(MAP - CVP) / CI] x 80

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