Correct Answer: C

Rationale: Cigarette smoking is a modifiable risk factor for coronary artery disease (CAD) because it can be changed or controlled to reduce the risk of developing CAD. Family history, age, and gender are non-modifiable risk factors, meaning they cannot be changed. By emphasizing the importance of quitting smoking, the nurse can help the client reduce their risk of CAD and improve their overall cardiovascular health.

Correct Answer: A

Rationale: Prothrombin time (PT) and international normalized ratio (INR) are essential laboratory tests to monitor the effectiveness of anticoagulant therapy in clients with atrial fibrillation. These tests help ensure that the client is within the therapeutic range and are commonly used to assess the clotting ability of the blood. Monitoring PT and INR levels allows healthcare providers to adjust anticoagulant dosages as needed to prevent complications such as bleeding or thrombosis.

Correct Answer: B

Rationale: Before administering enalapril, an antihypertensive medication, the nurse should prioritize checking the client's blood pressure. Monitoring blood pressure helps ensure it is at an acceptable level before giving the medication, as enalapril can further lower blood pressure. This assessment is crucial in preventing potential hypotensive episodes and adverse effects associated with excessive blood pressure reduction.

Correct Answer: C

Rationale: When a client is receiving furosemide, which is a loop diuretic, it can lead to potassium loss. Therefore, monitoring the serum potassium levels is crucial to prevent life-threatening complications such as cardiac arrhythmias.

Correct Answer: B

Rationale: Removing the nitroglycerin patch at night is essential to prevent the development of tolerance. Tolerance can occur when the body gets used to a constant level of the medication, reducing its effectiveness. By removing the patch at night, the client has a drug-free period, which helps prevent tolerance and maintains the effectiveness of the nitroglycerin for angina relief.