Correct Answer: D

Rationale: Seeing halos around lights is a symptom of digoxin toxicity, which should be reported to the healthcare provider.

Correct Answer: B

Rationale: Impaired gas exchange is the highest priority nursing diagnosis because it directly impacts the client's oxygenation. Following coronary artery bypass graft surgery, ensuring adequate oxygen exchange is crucial for the client's recovery. Ineffective breathing pattern, although important, may not be as critical as impaired gas exchange in the immediate postoperative period. Acute pain, while significant, can be managed effectively with appropriate interventions and is not as emergent as addressing impaired gas exchange. Risk for infection is also a valid concern post-surgery, but ensuring optimal gas exchange takes precedence to prevent complications associated with inadequate oxygenation.

Correct Answer: D

Rationale: Keeping the collection chamber below the level of the chest is crucial in caring for a client with a chest tube. This positioning helps ensure proper drainage of fluids and prevents complications such as backflow of drainage into the chest cavity. Option A is incorrect as continuous suction can lead to excessive drainage and tissue damage. Option B is incorrect as clamping the chest tube during client movement can cause a buildup of pressure and compromise proper drainage. Option C is incorrect because clamping the chest tube for extended periods can impede the drainage process, leading to potential complications.

Correct Answer: D

Rationale: The correct answer is D. During pregnancy, it is crucial to avoid taking any medication without consulting a healthcare provider to prevent harm to the developing fetus. Choices A, B, and C are important aspects of prenatal care but do not specifically address the potential risks associated with taking medications during pregnancy.

Correct Answer: A

Rationale: Verapamil slows sinoatrial nodal automaticity and delays atrioventricular nodal conduction, which slows the ventricular rate.