Final answer:
A patient in shock experiencing a decreased stroke volume is indicated by a narrowed pulse pressure. Stroke volume influences the pulse pressure, and when it decreases, the difference between systolic and diastolic pressures becomes smaller. Option c.
Step-by-step explanation:
The nurse determines that a patient in shock is experiencing a decrease in stroke volume when a narrowed pulse pressure is observed. This is because stroke volume, the amount of blood ejected by the left ventricle of the heart during each contraction, directly influences pulse pressure, which is the difference between the systolic and diastolic blood pressure.
A narrowed pulse pressure indicates a decrease in the stroke volume. Other signs of circulatory shock include an increased heart rate, decreased blood pressure, rapid shallow breathing, and symptoms such as confusion or loss of consciousness. The primary goal is to restore blood flow to the tissues and improve oxygen and nutrient delivery, which can involve intravenous fluids and vasoactive medications.