Correct Answer: B

Rationale: The correct answer is B: Vitamin K. Warfarin inhibits the action of vitamin K, which is essential for blood clotting. By interfering with the production of certain clotting factors, warfarin helps prevent blood clots. Choices A, C, and D are incorrect because warfarin primarily affects the vitamin K-dependent clotting factors and not platelets, calcium, or vitamin B12.

Correct Answer: B

Rationale: The correct answer is to increase sodium intake. For patients on lithium therapy, maintaining consistent sodium intake is crucial to avoid fluctuations in drug levels. Increasing caffeine intake (choice A) is not recommended as it can interfere with lithium levels. While protein intake (choice C) is important for overall health, it is not specifically essential for patients on lithium therapy. Similarly, increasing fiber intake (choice D) is beneficial but not a primary concern for patients on lithium therapy.

Correct Answer: A

Rationale: The correct answer is A. Amylase and lipase are enzymes specifically related to pancreatitis. A decrease in their serum levels indicates improvement in pancreatitis. White blood cell count (WBC), choices C and D, are not direct markers for pancreatitis improvement. Bilirubin levels, choice C, are more related to liver function rather than pancreatitis. Blood urea nitrogen (BUN) level, choice D, is a marker for kidney function, not pancreatitis.

Correct Answer: B

Rationale: The correct action for the nurse to take in this situation is option B: Call the practitioner, report the client's symptoms, and obtain further orders. The client is displaying symptoms that indicate potential complications, such as internal bleeding, which require immediate medical evaluation. Option A is incorrect because the client's condition suggests a more urgent need for assessment. Option C is inappropriate as it does not address the seriousness of the client's symptoms. Option D is dangerous and could exacerbate any underlying issue the client may be experiencing.

Correct Answer: D

Rationale: The correct answer is 'D' because assessing grasp strength (choice B) and orientation to person, place, and time (choice C) are crucial components of a neurological assessment following a cerebrovascular accident (CVA). Pulse assessment in all four extremities (choice A) is not directly related to a neurological assessment and is more pertinent to vascular status. Therefore, choices A and D are incorrect in this context.