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Patients sitting on chairs or wheelchairs should shift positions every:

  1. 10 min

  2. 15 min

  3. 20 min

  4. 30 min

The correct answer is: 10 min

It is important for patients who are sitting for extended periods of time to shift their positions regularly to avoid discomfort and prevent pressure sores. While all of the options listed may seem like reasonable time intervals for shifting positions, research has shown that the most optimal time frame is every 10 minutes. This allows for proper blood flow and prevents tissue damage. Choosing options B, C, or D may lead to increased discomfort or even potential injury for the patient. Therefore, option A is the best choice for ensuring the comfort and safety of patients sitting in chairs or wheelchairs.