Correct Answer: C

Rationale: The correct answer is C: aPTT. Monitoring the activated partial thromboplastin time (aPTT) is crucial when a client is receiving heparin therapy. The aPTT reflects the clotting time and helps assess the effectiveness of heparin in preventing clot formation. Keeping the aPTT within the therapeutic range ensures that the medication is working optimally. Choices A, B, and D are incorrect because serum potassium, platelets, and INR are not direct indicators of heparin's effectiveness or therapeutic range.

Correct Answer: B

Rationale: Placing the client in a private room is the appropriate infection control measure for C. difficile to prevent the spread of infection. While wearing a face shield may be necessary for procedures that generate splashes or sprays, it is not the primary precaution for C. difficile. Negative pressure rooms are typically used for airborne infections, not for C. difficile. Using an alcohol-based hand rub is important for hand hygiene but is not specific to managing C. difficile infection.

Correct Answer: A

Rationale: The correct answer is Hypokalemia. Furosemide, a loop diuretic, can lead to potassium depletion in the body, causing hypokalemia. This is a significant concern as low potassium levels can result in cardiac arrhythmias and other serious complications. Hyperkalemia (Choice B) is unlikely to occur as a result of furosemide use. Hyponatremia (Choice C) is more commonly associated with thiazide diuretics. Hypercalcemia (Choice D) is not typically linked to furosemide use.

Correct Answer: D

Rationale: The correct instruction for a client with DVT is to elevate the affected extremity when in bed. Elevation helps reduce swelling by promoting venous return. Limiting fluid intake could lead to dehydration and is not recommended. Massaging the affected extremity can dislodge a clot, leading to serious complications. Applying cold packs can cause vasoconstriction and should be avoided in DVT.

Correct Answer: D

Rationale: The correct intervention for a client receiving radiation therapy to the head and neck is to avoid exposure to direct sunlight. Direct sunlight should be avoided to protect the skin from further irritation and damage caused by the radiation therapy. Instructing the client to use an alcohol-free mouthwash is important to prevent irritation and maintain oral hygiene, making choice A incorrect. Applying heat packs to the radiation site is contraindicated as heat can further aggravate the skin, making choice B incorrect. Providing a diet low in carbohydrates is not directly related to radiation therapy to the head and neck, so choice C is also incorrect.