How is cardiac output calculated?
Dec 03, 2022
Source: Cainiu Health
Dr. Tian Hongbo
Introduction
Cardiac output refers to the volume of blood pumped by the left or right ventricle into the aorta or pulmonary artery per minute. It is generally calculated using the formula: cardiac output = heart rate × stroke volume. For example, if the heart beats 65 times per minute, then multiplying 65 by the stroke volume gives the cardiac output per minute. Additionally, any factors affecting stroke volume or heart rate may influence cardiac output.
Cardiac output usually refers to the volume of blood pumped by the heart per minute, which is generally calculated using the formula: cardiac output = heart rate × stroke volume.
In clinical terms, cardiac output refers to the amount of blood ejected per minute from the left ventricle into the aorta or from the right ventricle into the pulmonary artery. It is typically calculated as: minute output = heart rate × stroke volume. For example, if the heart beats 65 times per minute, then multiplying 65 by the stroke volume gives the patient's cardiac output per minute. Additionally, any factors affecting stroke volume or heart rate may influence cardiac output. For instance, if heart rate increases while stroke volume remains unchanged, cardiac output will also increase. Conversely, if heart rate stays constant but stroke volume increases, cardiac output will likewise rise.
Under normal conditions, cardiac output varies in response to metabolic demands and physical activity. For example, during muscle exertion or emotional excitement, the body may increase cardiac output by raising heart rate to meet increased physiological needs.
