Final answer:
Decreased cardiac output will affect the vital sign of blood pressure, leading to potential symptoms such as dizziness and fatigue.
Step-by-step explanation:
Decreased cardiac output will affect the vital signs, specifically the blood pressure. When cardiac output decreases, there is a decrease in the amount of blood being pumped out of the heart, which can lead to a decrease in blood pressure. The low blood pressure may result in symptoms such as dizziness, lightheadedness, and fatigue. It is important to monitor blood pressure in patients with decreased cardiac output to assess their cardiovascular health.