A nurse is being oriented to work for an intensive care unit. The hemodynamic data indicate that the patient has a decreased preload. Which information indicates the nurse has a correct understanding of the concept of preload?
a. It is the amount of blood ejected from the left ventricle each minute.
b. It is the amount of blood in the heart at the end of ventricular diastole.
c. It is the resistance to the ejection of blood from the left ventricle.
d. It is the rhythmic relaxation and contraction of the heart chambers.
B
Preload is the amount of blood at the end of ventricular diastole. Cardiac output is the amount of blood ejected from the left ventricle each minute. Cardiac conduction is the rhythmic relaxation and contraction of the atria and ventricles dependent on transmission of electrical impulses. Afterload is the resistance of the ejection of blood from the left ventricle.
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