Which of the following is NOT a sign that a patient is not tolerating activity in the ICU?

• A. HR increase or decrease drastically
• B. BP instability
• C. O2 desaturation
• D. Fever

Answer: (D)

When judging whether a patient can tolerate activity in the ICU, you look for how the body responds to the added work: the heart, blood vessels, and lungs should handle the increased demand without instability. A sign that activity is not being tolerated is a dramatic change in heart rate (either a sharp rise or a sudden drop), indicating the cardiovascular system isn’t meeting the demand. Another clear signal is blood pressure that becomes unstable during effort, showing the hemodynamic system can’t support the activity. A drop in oxygen saturation during exertion points to inadequate gas exchange or ventilatory support. Fever does not by itself indicate poor tolerance to activity; it signals infection or inflammatory stress and may influence how a patient feels, but it isn’t a direct sign that the body is failing to handle the activity load.