Correct Answer: B

Rationale: Assessing the puncture site for bleeding is a critical assessment after a cardiac catheterization procedure. This is essential to detect and address any potential complications promptly, such as hemorrhage or hematoma formation. Monitoring the puncture site helps ensure early intervention and prevent further complications, making it the priority assessment in this situation.

Correct Answer: B

Rationale: Muscle pain is a common side effect of statins like atorvastatin. It is important for the nurse to educate the client about this potential side effect, as it can indicate a serious condition called rhabdomyolysis, which requires immediate medical attention.

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.

Correct Answer: C

Rationale: Hypokalemia increases the risk of digoxin toxicity as low potassium levels enhance the effects of digoxin on the heart, leading to toxicity and potential adverse effects.

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.