Technical Calculator

Stroke Volume Calculator

The stroke volume calculator estimates the SV produced by the heart for detailed patient evaluation based on cardiac output and heart rate.

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The stroke volume calculator measures the quantity of blood discharged by the heart in a single beat. This parameter plays a significant role in assessing cardiac function and overall cardiovascular health. Generally, this measurement is utilized in anesthesiology to analyze the recovery after anesthesia in the Aldrete score.

Concept of Stroke Volume:

The volume of blood that is pumped out of the left ventricle of the heart during each systolic cardiac contraction. Typically, stroke volume is expressed in milliliters per beat (ml/beat). It is the difference between end-diastolic and end-systolic volume and their normal range is between 50-100 ml. It is determined by factors including preload, contractility, and afterload.

How To Calculate Stroke Volume?

The stroke volume is found by taking the difference between the left ventricular end-diastolic volume and the left ventricular end-systolic volume. In order to calculate stroke volume use our best online stroke volume calculator or use the manual stroke volume formula which is given as follows;

→ Stroke Volume = End Diastolic Volume - End Systolic Volume      

SV = EDV - ESV

Where:

  • EDV = The quantity of blood present in the ventricle at the end of diastole, signifying the peak heart’s capacity for blood storage in the relaxed state.
  • ESV = The quantity of blood retained within the ventricles following systole, indicative of the amount not ejected into the arteries during cardiac contraction.

There is a variety of parameters used to assess the cardiac output (CO) but one of the common strategies involves the product of heart rate (HR) and the stroke volume (SV). For this context, you can also use the cardiac output calculator.

Typically, the cardiac volume is determined in liters per minute.

→ CO = SV x HR

Stroke Volume Equation

→ SV = CO / HR

Stroke Volume Depending Factors:

Factors that increase SV Factors that decrease SV
Increased venous return Decreased vascular resistance
Increased vascular resistance Sodium and potassium concentrations
Sympathetic stimulation Calcium channel blockers
Epinephrine and norepinephrine stimulation Hypothermia
Glucagon Hypoxia
Thyroid hormones Parasympathetic stimulation

Additional Queries:

What Is The Regular Value of Stroke Volume?

Typical the range of stroke volume with 60 to 120 mL per beat. If you are an athlete, you may encounter measurements up to 200 mL.

If Cardiac Output is 7 Liters/Minute, What Is Stroke Volume?

If the cardiac output is 7 liters/minute assuming the heart rate is 80 beats per minute (bpm), then the stroke volume is approximately 87 mL/beat.

The stroke volume formula below helps to determine the accurate evaluation:

Stroke volume = Cardiac output / Heart rate

Stroke volume = 7 / 80

Stroke volume = 0.087 liters

Stroke volume = 87 milliliters

Does Cardiac Output Correspond To Cardiac Index?

No,

Cardiac output is the quantity of blood which is pumped by the heart per unit of time, whereas the cardiac index is the cardiac output per the body surface area.