A client in the recovery room following a procedure is unable to void, so the nurse obtains a prescription to perform a straight catheterization. After inserting the catheter, the nurse observes that the client has an immediate output of 500 mL of clear yellow urine. Which action should the nurse implement next?

Choice A: Avoid salt substitutes. This client needs additional education, as salt substitutes may contain potassium, which can increase the risk of hyperkalemia in clients with coronary artery disease. The nurse should teach the client to use herbs, spices, or lemon juice to flavor food instead of salt or salt substitutes.

Choice B: Consume canned vegetables. This client needs additional education, as canned vegetables may contain sodium, which can increase the blood pressure and worsen coronary artery disease. The nurse should teach the client to choose fresh or frozen vegetables instead of canned ones.

Choice C: Include oatmeal for breakfast. This client does not need additional education, as oatmeal is a good source of soluble fiber, which can lower cholesterol and reduce the risk of atherosclerosis. The nurse should praise the client for this healthy choice.

Choice D: Identify foods with saturated fats. This client does not need additional education, as identifying foods with saturated fats is an important step to avoid them. Saturated fats can raise cholesterol and increase the risk of coronary artery disease. The nurse should teach the client to limit saturated fats to less than 10% of total calories per day.

Choice E: Walk 30 minutes per day. This client does not need additional education, as walking 30 minutes per day is a recommended physical activity for clients with coronary artery disease. Physical activity can improve blood circulation, lower blood pressure, and reduce stress. The nurse should encourage the client to walk at a moderate pace and consult with the healthcare provider before starting any exercise program.

Choice F: Keep a food diary. This client does not need additional education, as keeping a food diary is a helpful tool to monitor dietary intake and identify areas for improvement. The nurse should teach the client to record the type, amount, and time of food consumed, as well as any symptoms or feelings associated with eating.

Choice A: Instructing the client to increase his intake of oral fluids until the skin flushing is relieved is not an appropriate action for the nurse, as this does not address the cause of the flushing, which is vasodilation due to tadalafil. This is a distractor choice.

Choice B: Advising the client to place one nitroglycerin tablet under his tongue as a precaution is a dangerous action for the nurse, as this can cause severe hypotension and cardiovascular collapse due to the interaction between tadalafil and nitroglycerin. This is a contraindicated choice.

Choice C: Telling the client to have someone bring him to an emergency department immediately is an unnecessary action for the nurse, as there is no evidence of any serious adverse reaction or complication from tadalafil. This is an overreaction choice.

Choice D: Reassuring the client that skin flushing is a common side effect of the medication is an appropriate action for the nurse, as this can calm the client and educate him about the expected effects of tadalafil. Therefore, this is the correct choice.