What is cardiac output, and how is it calculated?

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Understand that cardiac output (CO) is the volume of blood the heart pumps per minute, which is crucial for delivering oxygen and nutrients to tissues.

Recognize that cardiac output is calculated by multiplying the heart rate (HR), which is the number of heartbeats per minute, by the stroke volume (SV), which is the amount of blood pumped out of the ventricle with each beat.

Write the formula for cardiac output as: \(CO = HR \times SV\)

Identify the units: heart rate is usually measured in beats per minute (bpm), and stroke volume is measured in milliliters per beat (mL/beat), so cardiac output will be in milliliters per minute (mL/min).

To calculate cardiac output, obtain the values for heart rate and stroke volume, then multiply them using the formula to find the total volume of blood pumped by the heart each minute.

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Cardiac Output

Cardiac output is the volume of blood the heart pumps per minute. It reflects the heart's efficiency in supplying oxygen and nutrients to the body and is a key indicator of cardiovascular health.

Stroke Volume

Stroke volume is the amount of blood ejected by the left ventricle with each heartbeat. It depends on factors like heart contractility, preload, and afterload, influencing the overall cardiac output.

Heart Rate

Heart rate is the number of heartbeats per minute. It directly affects cardiac output since an increase in heart rate generally raises the volume of blood pumped, assuming stroke volume remains constant.