Correct Answer: B

Rationale: The most important nursing action when caring for a patient with a central venous catheter (CVC) is to change the CVC dressing every 72 hours. This practice reduces the risk of infection and ensures the catheter remains secure. Monitoring the patient's blood pressure regularly is important but not the most crucial action when managing a CVC. Flushing the CVC with normal saline is essential but not the most important action. Avoiding using the CVC for blood draws is a good practice, but it is not the most critical nursing action in this scenario.

Correct Answer: B

Rationale: The correct answer is B: Gait. Gait refers to the manner in which a person walks, including aspects such as stride length, step width, and walking speed. When a nurse observes a patient's gait, they are assessing their mobility and looking for any abnormalities or issues in their walking pattern. Choice A, body alignment, focuses more on the posture and position of the body rather than the actual walking pattern. Choice C, activity tolerance, relates to the ability to withstand physical activity without experiencing excessive fatigue. Choice D, range of motion, pertains to the extent of movement at a joint and is not directly related to observing the way a patient walks.

Correct Answer: B

Rationale: The most effective intervention in preventing postoperative complications is to ambulate the patient as soon as possible. Early ambulation helps prevent complications like deep vein thrombosis and pneumonia by enhancing circulation and preventing respiratory issues. Encouraging the patient to drink fluids, perform deep breathing exercises, or range of motion exercises are beneficial interventions, but ambulation is the priority due to its overall impact on preventing various postoperative complications.

Correct Answer: A

Rationale: The correct answer is to suction the tracheostomy to maintain a patent airway. After a tracheostomy, the priority intervention is to ensure a clear airway to prevent respiratory distress. Administering pain medication, changing the tracheostomy dressing, and monitoring oxygen saturation are important but are secondary to maintaining a patent airway in a patient who has just undergone a tracheostomy.

Correct Answer: B

Rationale: Checking the placement of the NG tube before each feeding is crucial to ensure it is correctly positioned and safe to use. Option A is incorrect as routine suctioning can lead to complications and should only be done as needed. Option C is not necessary unless there are specific instructions for flushing. Option D is incorrect as the NG tube should only be removed by healthcare professionals based on medical criteria, not solely based on the patient's comfort.