Correct Answer: A

Rationale: The correct answer is A. Troponin I is a specific marker for myocardial infarction, and levels of 8 ng/mL are elevated, indicating heart muscle damage. Brain natriuretic peptide (BNP) is more related to heart failure rather than myocardial infarction, making choice B incorrect. Alanine aminotransferase (ALT) is a liver enzyme and not specific to myocardial infarction, so choice C is incorrect. High-density lipoprotein (HDL) is a type of cholesterol and is not typically used to diagnose or monitor myocardial infarction, making choice D incorrect.

Correct Answer: B

Rationale: Rheumatoid factor is a specific marker for rheumatoid arthritis. It is often elevated in clients with this autoimmune condition, helping to confirm the diagnosis. Erythrocyte sedimentation rate (ESR) and antinuclear antibody tests can be supportive but are not specific for rheumatoid arthritis. Serum calcium levels are not typically used to confirm this diagnosis.

Correct Answer: C

Rationale: The correct action for the nurse to take before performing a closed intermittent bladder irrigation is to apply sterile gloves. Sterile gloves help maintain asepsis, reduce the risk of infection, and ensure patient safety during the procedure. Aspirating the irrigation solution from the bladder (Choice A) is not a standard step in closed intermittent bladder irrigation. Inserting the tip of the irrigation syringe into the catheter opening (Choice B) can introduce contaminants into the system. Opening the flow clamp to the irrigating fluid infusion tubing (Choice D) should only be done after ensuring all equipment is ready and the nurse is gloved to maintain sterility.

Correct Answer: D

Rationale: The correct answer is D because transporting a stable child to x-ray is a task that can be safely delegated to an assistive personnel. This task does not require clinical judgment or specialized skills. Choices A, B, and C involve assessments and interventions that require nursing judgment and should be performed by a qualified nurse. Initiating a dietary consult for a toddler involves assessing the child's nutritional needs and must be done by a nurse. Administering a glycerin suppository to a preschool-age child requires medication administration skills and knowledge of appropriate dosages, which are within the nurse's scope of practice. Evaluating gastric residual following intermittent feeding of an adolescent is a clinical assessment that requires interpretation and decision-making based on the findings, making it a nursing responsibility.

Correct Answer: A

Rationale: The correct answer is A. Ibuprofen can increase the risk of bleeding when taken with warfarin, as both medications affect clotting. The client should use alternative pain relievers like acetaminophen. Choice B is correct as using an electric razor is a safe choice to prevent cuts that could lead to bleeding. Choice C is correct as warfarin interacts with vitamin K found in leafy green vegetables. Choice D is correct as regular blood level checks are necessary to monitor the effects and adjust the warfarin dosage if needed.