Correct Answer: A

Rationale: The correct answer is A: Encouraging early ambulation. Early ambulation helps prevent complications such as deep vein thrombosis and pulmonary embolism by improving circulation and preventing blood clots. It also promotes joint mobility and muscle strength. Providing pain medication (B) is important but not as crucial as preventing complications. Monitoring for signs of infection (C) is essential but not the most important intervention. Administering antibiotics before surgery (D) does not directly prevent post-operative complications related to knee replacement.

Correct Answer: D

Rationale: The correct answer is D because it involves a specific and observable task that assesses attention span. By asking the patient to perform a physical action that requires focus and coordination, the nurse can directly evaluate the patient's ability to follow instructions and maintain attention. This task also helps to assess motor skills and coordination, which can be affected in certain conditions associated with anxiety and restlessness. Choices A, B, and C are incorrect because they do not directly assess attention span. Choice A focuses on emotions and behavior rather than attention. Choice B assesses memory recall rather than attention span. Choice C tests comprehension and interpretation skills related to a phrase, but it does not evaluate attention span directly.

Correct Answer: D

Rationale: The correct answer is D: Clubbing of the nails. Clubbing is a physical finding associated with chronic respiratory conditions like emphysema and bronchitis. It is characterized by the softening of the nail bed and the loss of the normal angle between the nail and the nail bed. This occurs due to chronic hypoxia and can be a sign of advanced lung disease. Anasarca (choice A) is generalized edema, not specific to respiratory conditions. Scleroderma (choice B) is a connective tissue disorder affecting the skin and other organs, not directly related to respiratory conditions. Pedal erythema (choice C) refers to redness of the feet and is not a typical finding in emphysema or bronchitis.

Correct Answer: D

Rationale: The correct answer is D: Pitting edema and weight gain. In chronic heart failure, worsening symptoms indicate fluid retention. Pitting edema in the extremities and weight gain are signs of fluid overload, indicating worsening heart failure. It is crucial for the nurse to monitor these signs to prevent exacerbation. Fatigue and shortness of breath (Choice A) are common symptoms in heart failure but not specific to worsening condition. Increased urine output (Choice B) is not typically seen in worsening heart failure as the kidneys may be compromised. Decreased blood pressure (Choice C) can occur in acute decompensation but is not a consistent sign of worsening chronic heart failure.

Correct Answer: A

Rationale: The correct answer is A: Encouraging early ambulation. Early ambulation helps prevent complications such as deep vein thrombosis and pulmonary embolism by improving circulation and preventing blood clots. It also promotes joint mobility and muscle strength. Providing pain medication (B) is important but not as crucial as preventing complications. Monitoring for signs of infection (C) is essential but not the most important intervention. Administering antibiotics before surgery (D) does not directly prevent post-operative complications related to knee replacement.