Correct Answer: B

Rationale: The Partial Thromboplastin Time (PTT) is the correct laboratory value to monitor heparin therapy. PTT measures the time it takes for blood to clot and is specifically used to evaluate the effectiveness of anticoagulation therapy such as heparin. Monitoring the PTT helps ensure that the heparin dose is within the therapeutic range. Platelet count, Prothrombin time (PT), and Bleeding time are not specific laboratory values for monitoring the therapeutic effect of heparin therapy. Platelet count is more indicative of platelet function, PT is used to monitor warfarin therapy, and Bleeding time assesses platelet function rather than the effect of heparin therapy.

Correct Answer: B

Rationale: To ensure proper functioning of a chest tube, the nurse should keep the drainage system below chest level. This position allows for proper drainage by gravity and prevents backflow into the pleural space. Clamping the chest tube intermittently can lead to a buildup of pressure and should be avoided. Emptying the drainage chamber every 4 hours is important but not directly related to maintaining the chest tube's function. Applying sterile gauze around the insertion site daily is essential for infection prevention but does not specifically ensure the proper functioning of the chest tube.

Correct Answer: D

Rationale: The client with slurred speech, disorientation, and a headache may be experiencing a stroke, a life-threatening condition that requires immediate attention. Identifying and managing a stroke promptly can reduce the risk of long-term disability or complications. The other options, although important, do not present immediate life-threatening conditions that require urgent intervention. A dislocated shoulder, severe joint pain in sickle cell disease, confusion with fever and foul-smelling urine, while concerning, can be addressed after attending to the client with potential stroke symptoms.

Correct Answer: C

Rationale: The correct answer is C. This statement indicates understanding because the client recognizes that they should use the PCA pump when they start to feel pain. Waiting for the pain to become severe is not recommended as it may lead to inadequate pain control. Option B is incorrect because only the client should control the PCA pump to ensure safety and appropriate dosing. Option D is also incorrect as there is no set limit on how often the button can be pressed, as it should be used as needed when pain is felt.

Correct Answer: A

Rationale: The correct answer is A: Drinking grapefruit juice. Grapefruit juice can increase the risk of statin toxicity by interfering with the enzyme that metabolizes statin medications, leading to higher drug levels in the body. This interaction can potentially cause adverse effects. Therefore, patients should be advised to avoid consuming grapefruit juice while taking statins. Choices B, C, and D are incorrect. Consuming high-protein meals, exercising regularly, and taking the medication in the morning are not contraindicated while on statin therapy. In fact, following a healthy diet, engaging in physical activity, and taking the medication at a consistent time each day can be beneficial for patients prescribed statins.