Correct Answer: A

Rationale: The correct answer is A: Maintain sterility during dressing changes. It is crucial to maintain sterility during dressing changes for patients with central venous catheters to prevent infections. Changing the dressing weekly (Choice B) is not frequent enough to prevent infections effectively. Monitoring blood pressure and fluid balance (Choice C) is important for overall patient care but not specific to central venous catheter management. While monitoring the catheter site for infection (Choice D) is important, the key consideration is to prevent infections through proper sterile techniques during dressing changes.

Correct Answer: A

Rationale: The correct technique for administering an intramuscular (IM) injection is to locate the injection site and insert the needle at a 90-degree angle. This angle ensures that the medication is delivered into the muscle for proper absorption. Choice B is incorrect because a 45-degree angle is typically used for subcutaneous injections, not intramuscular. Choice C is incorrect as massaging the site after an injection can cause the medication to disperse unevenly. Choice D is incorrect as a 15-degree angle would not reach the muscle layer effectively for an IM injection.

Correct Answer: C

Rationale: Choice C is the correct answer. During a colonoscopy, clients are typically sedated, so they do not feel any pain during the procedure. Choices A, B, and D are incorrect. Clients are usually required to stop eating and drinking at least 24 hours before a colonoscopy, and there are specific dietary restrictions that need to be followed before the procedure to ensure a successful examination.

Correct Answer: C

Rationale: The correct instruction is to apply the prosthesis immediately upon waking each day. This helps the client adjust to and maintain mobility. Choice A is incorrect because wearing the prosthesis for only 2 hours at a time may not be sufficient for proper adjustment. Choice B is incorrect as removing the prosthesis every other day is not a standard practice and may hinder the client's mobility. Choice D is incorrect because elevating the stump for 24 hours after applying the prosthesis is unnecessary and not a recommended practice.

Correct Answer: B

Rationale: Irritability is an early sign that suctioning is required to clear secretions in a client with a tracheostomy. Hypotension, flushing, and bradycardia are not direct indicators for suctioning a tracheostomy. Hypotension may indicate a need for fluid resuscitation or other interventions, flushing could be due to various reasons like fever, and bradycardia may require evaluation for cardiac causes.