Correct Answer: C

Rationale: The correct answer is C. If sterile solution splashes onto the sterile field, it is considered contaminated. Changing gloves in this situation ensures that the sterility of the dressing change is maintained. Choice A is incorrect as non-sterile gloves would introduce contaminants. Choice B is incorrect as layering gloves can increase the risk of contamination. Choice D is incorrect as covering the sterile field with a sterile drape is not the appropriate action to take in response to contamination.

Correct Answer: B

Rationale: The correct instruction when using a metered-dose inhaler (MDI) is to shake the inhaler vigorously before use. Shaking the inhaler ensures proper mixing of the medication, which is crucial for effective delivery of the medication into the lungs. Inhaling for a specific duration, holding the inhaler at a certain distance from the mouth, or holding the breath after inhalation are not as critical as ensuring proper mixing of the medication by shaking the inhaler.

Correct Answer: A

Rationale: Bladder distention is the correct answer as it indicates that the catheter is not draining properly, which is a sign of occlusion. Frequent urination, hematuria, and burning sensation are not indicative of a catheter occlusion. Frequent urination may suggest a bladder that is not fully emptying, hematuria indicates blood in the urine, and a burning sensation can be a sign of a urinary tract infection, none of which directly relate to a catheter occlusion.

Correct Answer: C

Rationale: The correct answer is C: 'Avoid open flames or smoking near oxygen.' This information is crucial to prevent fire hazards as oxygen supports combustion. Choices A, B, and D are incorrect. Increasing the oxygen flow rate without healthcare provider's instructions can be dangerous. Oxygen should not be turned off when not in use as prescribed by the healthcare provider, and storing oxygen tubing near heat sources poses a risk of fire.

Correct Answer: B

Rationale: The correct instruction the nurse should include when teaching a client about using a metered-dose inhaler (MDI) is to hold the inhaler 1-2 inches from the mouth. This distance ensures proper delivery of the medication into the airways. Choices A, C, and D are incorrect because inhaling for a specific duration, exhaling immediately after inhaling, or holding the inhaler directly at the lips are not recommended practices for the correct use of an MDI.