Correct Answer: A

Rationale: The correct answer is A. Cleansing the bag every 24 hours can lead to contamination, increasing the risk of infection and diarrhea. Using tap water (choice C) is not recommended for cleaning the gastrostomy tube due to the risk of introducing harmful microorganisms. Cleansing the bag every 48 hours (choice B) is not frequent enough and may also contribute to infection. Flushing the tube every 4 hours (choice D) is a standard practice to ensure patency and should not be intervened by the nurse.

Correct Answer: D

Rationale: The correct strategy to include in the teaching after a gastrectomy is to avoid drinking liquids with meals. This helps prevent dumping syndrome, a condition characterized by rapid emptying of undigested food and fluids from the stomach into the small intestine. Choices A, B, and C are incorrect. Drinking fluids between meals is appropriate to maintain hydration, eating three large meals can exacerbate dumping syndrome, and lying down after meals is not recommended as it can increase the risk of reflux.

Correct Answer: D

Rationale: The correct answer is D because rotating injection sites prevents tissue damage and ensures better absorption of insulin. Option A is incorrect as injecting insulin into the thigh before exercise can lead to hypoglycemia. Option B is incorrect as skipping meals can cause blood sugar levels to drop dangerously low. Option C is incorrect as insulin should not be stored in the freezer as it can alter its effectiveness.

Correct Answer: B

Rationale: The correct answer is to administer nitroglycerin. Nitroglycerin is the priority intervention for a patient presenting with chest pain as it helps dilate blood vessels, reduce chest pain, and improve oxygen supply to the heart. Obtaining a detailed medical history, conducting an ECG, or administering morphine sulfate are important steps in the assessment and treatment process but are secondary to the immediate need to address chest pain and potential cardiac ischemia.

Correct Answer: C

Rationale: The correct answer is C: 'Avoid lifting more than 10 lb.' After a cataract extraction, the nurse should instruct the client to avoid lifting heavy objects to prevent increased intraocular pressure, which could lead to complications. Choices A, B, and D are incorrect. A - 'Bend at the waist when picking up objects' can increase intraocular pressure; B - 'Avoid lying on the operative side' is not a specific concern related to cataract extraction; D - 'Apply ice to the affected eye' is not a standard post-cataract extraction instruction.