A nurse is teaching a client who is taking metformin XR for type 2 diabetes mellitus. Which of the following instructions should the nurse include in the teaching?

Choice A reason: Edema is primarily related to fluid retention and sodium imbalance, not protein intake. While protein can influence oncotic pressure, reducing protein does not directly prevent edema in chronic kidney disease.

Choice B reason: Hyperkalemia is associated with potassium intake and impaired renal excretion, not protein consumption. A low-protein diet does not specifically target potassium levels unless the protein sources are high in potassium.

Choice C reason: Uremia results from the accumulation of nitrogenous waste products due to impaired renal function. Protein metabolism produces urea and other nitrogenous compounds. A low-protein diet helps reduce the production of these wastes, thereby lowering the risk of uremia and its associated symptoms such as nausea, confusion, and pruritus.

Choice D reason: This statement is incorrect. A low-protein diet decreases the production of nitrogenous wastes, not increases them. High protein intake in renal failure exacerbates uremia due to the kidneys' inability to excrete the byproducts effectively.

Choice A reason: Activated partial thromboplastin time (aPTT) is used to monitor heparin therapy, not warfarin. Warfarin requires monitoring of the international normalized ratio (INR) and prothrombin time (PT) to assess its anticoagulant effect. Using aPTT for warfarin would not provide accurate information about the client's coagulation status.

Choice B reason: NSAIDs should be avoided when a client is taking warfarin due to the increased risk of bleeding. NSAIDs can impair platelet function and cause gastrointestinal bleeding, which can be exacerbated by warfarin’s anticoagulant effects. Co-administration is contraindicated unless specifically directed and monitored by a healthcare provider.

Choice C reason: Protamine sulfate is the antidote for heparin, not warfarin. The correct antidote for warfarin is vitamin K, which helps reverse its anticoagulant effects by promoting synthesis of clotting factors. Misidentifying the antidote could delay appropriate treatment in case of bleeding.

Choice D reason: Observing the client for signs of hemorrhage is essential when administering warfarin. Warfarin increases the risk of bleeding due to its inhibition of vitamin K-dependent clotting factors. Nurses must monitor for signs such as bruising, hematuria, melena, and bleeding gums to ensure early detection and intervention.