A nurse is completing a medical interview with a client who has elevated cholesterol levels and takes warfarin. The nurse should recognize that which of the following actions by the client can potentiate the effects of warfarin?

Choice A reason: Expecting to gain weight while taking this medication is not a correct instruction, as it may discourage the client from adhering to the treatment and may worsen the hypertension. Captopril is an angiotensin-converting enzyme (ACE) inhibitor that lowers the blood pressure by preventing the formation of angiotensin II, a potent vasoconstrictor. Captopril does not cause significant weight gain, but it may cause fluid retention or edema in some cases. The nurse should advise the client to monitor the weight daily and report any sudden or excessive increase to the provider.

Choice B reason: Not using salt substitutes while taking this medication is a correct instruction, as it may prevent the risk of hyperkalemia, a potentially life-threatening condition. Captopril may increase the potassium level in the blood by reducing the secretion of aldosterone, a hormone that regulates the sodium and potassium balance. Salt substitutes may contain potassium chloride, which may further elevate the potassium level. The nurse should advise the client to avoid salt substitutes and high-potassium foods, such as bananas, oranges, or tomatoes, and to have regular blood tests to check the electrolyte levels.

Choice C reason: Counting the pulse rate before taking the medication is not a necessary instruction, as it may not reflect the effect of the medication on the blood pressure. Captopril does not affect the heart rate significantly, but it may lower the blood pressure too much, especially in the first few weeks of treatment or after a dose increase. This may cause hypotension, dizziness, or fainting. The nurse should advise the client to monitor the blood pressure regularly and report any symptoms of hypotension to the provider.

Choice D reason: Taking the medication with food is not a correct instruction, as it may reduce the absorption and effectiveness of the medication. Captopril should be taken on an empty stomach, at least one hour before or two hours after a meal, to ensure optimal bioavailability. The nurse should advise the client to take the medication at the same time every day and to avoid skipping or doubling the doses.

Choice A reason: Ataxia is not a manifestation of digoxin toxicity, as it does not affect the coordination or balance of the client. Ataxia may be caused by other factors, such as cerebellar disorders, alcohol intoxication, or medication interactions.

Choice B reason: Anorexia is a manifestation of digoxin toxicity, as it affects the appetite and digestion of the client. Anorexia may be accompanied by nausea, vomiting, or abdominal pain, which are also signs of digoxin toxicity. Anorexia may lead to weight loss, dehydration, or electrolyte imbalance, which can worsen the condition of the client.

Choice C reason: Photosensitivity is not a manifestation of digoxin toxicity, as it does not affect the skin or the eyes of the client. Photosensitivity may be caused by other factors, such as sun exposure, allergies, or medication interactions.

Choice D reason: Jaundice is not a manifestation of digoxin toxicity, as it does not affect the liver or the bilirubin level of the client. Jaundice may be caused by other factors, such as liver disease, gallstones, or hemolysis.