The nurse is researching a medication that affects stroke volume (SV). The SV, the volume of blood ejected with each heartbeat, depends on which of the following?
A) The preload and afterload factors
B) Influence of ANS
C) Ventricular filling with audible vibrations
D) Rhythmic expansion of arterial walls
A
Feedback:
Preload is the amount of pressure or "stretching force" against the ventricular wall at end diastole, and afterload is the amount of pressure or resistance the ventricles must overcome to empty their contents. Both these can affect the stroke volume. The autonomic nervous system can influence the heart rate. Abnormal heart sounds occur when ventricular filling creates audible vibrations during a normally silent diastolic phase. Rhythmic expansion of arterial walls is the pulse.
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