Correct Answer: B

Rationale: The correct answer is B: Vitamin K. Warfarin works by inhibiting the action of vitamin K, which is crucial for the synthesis of clotting factors in the blood. By interfering with vitamin K, warfarin decreases the production of these clotting factors, thereby prolonging the time it takes for blood to clot. This is why individuals on warfarin therapy need to monitor their vitamin K intake. Choices A, C, and D are incorrect because warfarin does not directly interfere with platelets, calcium, or vitamin B12.

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.

Correct Answer: D

Rationale: After a pericardiocentesis, the nurse should implement multiple interventions to monitor the client's condition closely. Monitoring vital signs every 15 minutes for the first hour is crucial to detect any immediate changes that may indicate complications. Evaluating the client's cardiac rhythm is important to identify any arrhythmias that may occur due to the procedure. Recording the amount of fluid removed is essential to calculate fluid balance and ensure accurate monitoring of the client's status. Therefore, all the interventions mentioned are necessary to detect and manage any potential issues post-pericardiocentesis. Choices A, B, and C are all essential components of post-procedural care and should be implemented to ensure the client's safety and well-being.

Correct Answer: D

Rationale: The automated data processing systems in the medical C4I headquarters play a crucial role in maintaining patient accountability by tracking patient movement and aiding in the management of health service logistics systems. Therefore, the correct answer is D. Option A is incorrect because the systems do more than just maintaining patient accountability. Option B is incorrect as it focuses solely on tracking patient movement, missing the broader scope. Option C is also incorrect as it only addresses the management of health service logistics systems and overlooks the other functionalities provided by the systems.

Correct Answer: A

Rationale: Carrying the infant astride one of her hips helps keep the legs apart and can help reduce muscle tightness. This position allows for better support and alignment, preventing further muscle contractures. Strapping the infant in an infant seat, wrapping tightly in a blanket, or using the football hold under the arm would not provide the same benefits and may even exacerbate muscle tightness in a child with cerebral palsy.