Correct Answer: A

Rationale: The most important instruction for a patient following cataract extraction is to avoid straining, bending, or lifting heavy objects. These activities can increase intraocular pressure and potentially lead to complications such as bleeding or dislocation of the intraocular lens. Choices B, C, and D are not as critical in the immediate post-operative period. Limiting sunlight exposure and using direct lighting when reading are important but not as crucial as avoiding activities that can increase intraocular pressure. Irrigating the conjunctiva with saline before applying ointment is not a standard post-cataract surgery instruction.

Correct Answer: B

Rationale: The correct action for the nurse to take in response to the return demonstration of using an incentive spirometer is to remind the client to cough after using the device. Coughing helps clear secretions from the lungs and promotes lung expansion. Instructing the client to inhale more deeply (Choice A) is not necessary as the primary focus after using the spirometer is to clear secretions. Praising the client for correct usage (Choice C) is positive but does not address the essential step of coughing. Suggesting increasing the frequency of spirometer use (Choice D) is not the immediate action needed after the demonstration.

Correct Answer: A

Rationale: The correct answer is to check the client's potassium levels. Potassium levels are crucial to assess before hemodialysis in a client with renal failure because hyperkalemia (high potassium) is a common complication in these patients. Hemodialysis aims to remove excess potassium from the blood, making it essential to monitor potassium levels to determine the need for appropriate interventions. Reviewing the client's medication list (Choice B) is important for overall care but is not as directly relevant to the immediate concerns before hemodialysis. Assessing peripheral pulses (Choice C) and monitoring urine output (Choice D) are important aspects of nursing assessment but are not as directly related to the specific preparation needed before hemodialysis in a client with renal failure.

Correct Answer: C

Rationale: The correct answer is C. Daily use of spironolactone for hypertension can increase the risk of hyperkalemia and interact with penicillin, leading to adverse reactions. Choice A is incorrect because the sputum culture showing Streptococcus pneumoniae is an expected finding in a patient with pneumonia and does not increase the risk of an adverse reaction to penicillin. Choice B is incorrect as previous treatment with penicillin does not necessarily increase the risk of an adverse reaction to penicillin if there was no history of allergic reactions. Choice D is also incorrect as a documented allergy to sulfa drugs does not directly increase the risk of an adverse reaction to penicillin.

Correct Answer: A

Rationale: The correct answer is A. Allowing the client to sit on the side of the bed before standing helps prevent dizziness and falls, especially during their first ambulation post-surgery. Choice B is incorrect because asking the client to take deep breaths when feeling dizzy may not address the underlying cause of the dizziness. Choice C is incorrect as it is unrelated to the task of assisting the client to ambulate for the first time. Choice D is incorrect because knowing how the client feels after sitting in the chair does not address the important step of assisting the client to stand up for the first time.