Cardiac Output Calculator (2024)

FAQs

How do you calculate the cardiac output? ›

The heart rate multiplied by the stroke volume gives the cardiac output. The formula is given as CO = HR SV. It denotes the volume of blood being pumped out by the heart. Heart rate is the number of times the heart beats in one minute.

Cardiac output is calculated by multiplying stroke volume with heart rate. The extensive use of arterial pressure signal processing makes the FloTrac algorithm highly dependent upon a high-fidelity pressure signal.

Cardiac output (CO) is the term used to show the amount of blood pumped per minute by each ventricle. Cardiac output is determined by multiplying the number of heartbeats per minute times the volume of blood pumped by the ventricles with each heartbeat. Therefore, we can use the equation CO = HR x SV.

The following formula is used to calculate cardiac output: Cardiac output = heart rate × stroke volume.

Cardiac Output Equation

Here's the equation (where CO = cardiac output (liters/min), HR = heart rate (beats/min), and SV = stroke volume (milliliters)): Heart rate (beats/min.) x Stroke volume (mL) = Cardiac output (l/min.)

Cardiac output is calculated by multiplying the stroke volume by the heart rate. Stroke volume is determined by preload, contractility, and afterload.

The stroke volume multiplied by the heart rate (number of beats per min) gives the cardiac output. Therefore, the cardiac output can be defined as the volume of blood pumped out by each ventricle per minute and averages 5000 ml or 5 litres in a healthy individual.

Measurement of CO with a pulmonary artery catheter is done using the thermodilution technique: A known volume of D5W at a temperature that is colder than blood temperature is injected into the right atrial port of the catheter. D5W is used because the molecular weight is incorporated into the cardiac output algorithm.

What is the best measure of cardiac output? ›

Today, therefore, CO calculation by thermodilution catheter remains the clinical “gold standard.” An additional advantage of PAC over other methods of measuring CO is the ability to assess pulmonary pressures and preload.

Also, because the major function of the cardiovascular system is to supply sufficient amounts of oxygen to meet the metabolic demands of the tissues, it appears reasonable to measure cardiac output in the assessment of cardiovascular insufficiency.

Cardiac output = heart rate x stroke volume

The equation can be rearranged to find the heart rate and stroke volume if required: Heart rate = cardiac output ÷ stroke volume. Stroke volume = cardiac output ÷ heart rate.

Simple mathematical transforms have been proposed to estimate CO from pulse pressure (PP = mean systolic blood pressure (SBP) minus mean diastolic blood pressure (DBP)), and mean heart rate (HR). Recently we evaluated one such simple technique [CO=(PPxHR)x.

In summary: the Fick Principle, using oxygen as an example: The total uptake of oxygen is equal to the product of the cardiac output and the arterial-venous oxygen content difference. Thus, cardiac output (CO) = VO₂ / (C_a - C_v)