In Step 4, what is the primary task?

• A. Identify all factors contributing to deficits
• B. Determine whether mobilization is indicated
• C. Match the appropriate mobilization stimulus to transport capacity
• D. Set the intensity within therapeutic and safe limits of the patient’s O2 transport capacity

Answer: (D)

Setting the intensity of activity to stay within the patient’s safe and therapeutic oxygen transport capacity is what Step 4 concentrates on. The oxygen transport capacity represents how much oxygen the cardiopulmonary system can deliver to tissues during activity. If you push the patient beyond that limit, demand outstrips supply, risking desaturation, myocardial strain, arrhythmias, or intolerable fatigue. So the primary task is to tailor how hard, how long, and at what pace mobilization is performed so the body's oxygen delivery can meet the muscles' needs without crossing safe thresholds.

In practice, this means choosing an exercise or activity level that elicits a light to moderate response without excessive heart rate rise, blood pressure fluctuations, or drop in oxygen saturation, and then adjusting as the patient progresses. While identifying deficits, deciding if mobilization is appropriate, or selecting the general type of mobilization stimulus are important steps, the specific emphasis of Step 4 is prescribing the intensity within the patient’s O2 transport limits.