Correct Answer: C

Rationale: The correct answer is C because the Montreal Cognitive Assessment (MoCA) is specifically designed to detect delirium and dementia and differentiate these conditions from psychiatric mental illness. It assesses various cognitive domains such as memory, attention, language, and visuospatial abilities. Scores below the normal range on the MoCA can indicate cognitive impairment related to delirium or dementia. Choice A is incorrect because a score below 30 on the MoCA does not necessarily indicate cognitive impairment; it depends on the individual's baseline and education level. Choice B is incorrect because the MoCA primarily focuses on cognitive function rather than mood and thought processes. Choice D is incorrect because while the MoCA can be used for initial evaluation of cognitive function, it is not sufficient for evaluating changes over time. Additional tools and assessments are needed for longitudinal monitoring of cognitive changes.

Correct Answer: B

Rationale: The correct answer is B: Encouraging early ambulation and use of compression stockings. This intervention is crucial post-hip replacement to prevent complications such as blood clots and muscle weakness. Early ambulation helps prevent blood clots by promoting circulation, and compression stockings further aid in preventing deep vein thrombosis. Pain medication (A) is important but not the priority in preventing complications. Providing nutritional support (C) is also important but does not directly prevent post-operative complications. Monitoring for signs of infection (D) is essential but not as immediate as promoting early ambulation to prevent complications.

Correct Answer: A

Rationale: The correct answer is A. A blood pressure reading of 160/100 mm Hg is most concerning because it falls within the hypertensive crisis range, indicating severely elevated blood pressure that requires immediate medical attention to prevent complications like stroke or heart attack. Choices B, C, and D are within the prehypertension or mild hypertension ranges and are not as immediately concerning.

Correct Answer: C

Rationale: The correct answer is C because the Montreal Cognitive Assessment (MoCA) is specifically designed to detect delirium and dementia and differentiate these conditions from psychiatric mental illness. It assesses various cognitive domains such as memory, attention, language, and visuospatial abilities. Scores below the normal range on the MoCA can indicate cognitive impairment related to delirium or dementia. Choice A is incorrect because a score below 30 on the MoCA does not necessarily indicate cognitive impairment; it depends on the individual's baseline and education level. Choice B is incorrect because the MoCA primarily focuses on cognitive function rather than mood and thought processes. Choice D is incorrect because while the MoCA can be used for initial evaluation of cognitive function, it is not sufficient for evaluating changes over time. Additional tools and assessments are needed for longitudinal monitoring of cognitive changes.

Correct Answer: C

Rationale: The correct answer is C because the small, flat, brown macules described are consistent with lentigines (commonly known as age or liver spots), which are clusters of melanocytes that appear after prolonged sun exposure. This explanation directly addresses the patient's question about the cause of the spots and is supported by the clinical presentation. Choice A is incorrect because decreased hematocrit related to anemia would not cause these specific skin changes. Choice B is incorrect as destruction of melanin due to sun exposure would result in lighter spots, not dark brown macules. Choice D is incorrect because hyperpigmentation related to decreased perfusion and vasoconstriction would present differently and not primarily on sun-exposed areas like the arms and hands.