Correct Answer: C

Rationale: The correct answer is C: aPTT. The healthcare provider should monitor the activated partial thromboplastin time (aPTT) value during heparin therapy to assess the client's coagulation status. Heparin affects the intrinsic pathway of the coagulation cascade, and monitoring aPTT helps ensure that the client is within the therapeutic range to prevent bleeding or clotting issues. INR (Choice A) is used to monitor warfarin therapy, not heparin. Serum creatinine (Choice B) is not directly related to monitoring heparin therapy. Bilirubin (Choice D) is related to liver function, not heparin therapy.

Correct Answer: B

Rationale: Visual disturbances such as blurred vision or seeing halos around lights are common signs of digoxin toxicity. Increased appetite, weight gain, and constipation are not typically associated with digoxin toxicity. Weight gain could be a sign of worsening heart failure rather than digoxin toxicity. Increased appetite and constipation are not specific signs of digoxin toxicity and are less likely to be related.

Correct Answer: A

Rationale: The correct answer is A. Pregnancy or the possibility of pregnancy within 4 weeks is a contraindication for receiving the MMR vaccine. Choice B, client allergy to strawberries, is not a contraindication to the MMR vaccine. Choice C, client history of genital herpes, is not a contraindication for the MMR vaccine. Choice D, the possibility of overseas travel in the next month, is not a contraindication to the MMR vaccine.

Correct Answer: B

Rationale: The correct instruction for administering insulin is to rotate injection sites to prevent lipodystrophy, a common complication of insulin therapy. Injecting into the deltoid muscle (Choice A) is not recommended for insulin injections. Massaging the site after injection (Choice C) is not necessary and can potentially increase the risk of lipodystrophy. Using the same site for each injection (Choice D) can lead to localized tissue damage and absorption irregularities, making it an incorrect choice.

Correct Answer: A

Rationale: The correct answer is A: Hepatotoxicity. Disulfiram is known to cause hepatotoxicity as a severe adverse effect. This occurs due to the inhibition of aldehyde dehydrogenase, leading to the accumulation of acetaldehyde when alcohol is consumed. Wernicke's aphasia (Choice B) is a language disorder unrelated to disulfiram therapy. Suicidal ideations (Choice C) may be associated with certain medications, but it is not a common adverse effect of disulfiram. Diarrhea (Choice D) is not a typical adverse effect of disulfiram.