The nurse is educating a group of nursing students about cardiac output. What information should the nurse include about preload?
A) The amount of pressure or resistance the ventricles must overcome to empty their contents
B) The amount of pressure or stretching force against the ventricular wall at end diastole
C) Amount of blood pumped by the ventricles in 1 minute
D) Volume of blood ejected with each heartbeat
B
Feedback:
Preload is the amount of pressure or "stretching force" against the ventricular wall at end diastole (maximum relaxation of the heart). Cardiac output (CO) is the amount of blood pumped by the ventricles in 1 minute. In the resting adult, the normal amount is between 4 and 6 L. Stroke volume (SV) is the volume of blood ejected with each heartbeat. Afterload is the amount of pressure or resistance the ventricles must overcome to empty their contents.
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