A patient with acute kidney injury (AKI) requiring parenteral nutrition would most likely benefit from a solution containing which of the following?

• A. Essential amino acids only
• B. Essential amino acids with arginine only
• C. Essential amino acids and nonessential amino acids
• D. Essential amino acids and branched chain amino acids

Answer: (C)

In parenteral nutrition for acute kidney injury, providing a full spectrum of amino acids—both essential and nonessential—is best because the patient needs substrates for every protein-building process during healing and recovery. Essential amino acids cannot be made by the body, so they must be supplied; nonessential amino acids, while they can be synthesized, are often used up more quickly during critical illness and support numerous metabolic pathways essential for recovery.

If only essential amino acids were given, nonessential amino acids would be missing, which can limit protein synthesis and other vital functions. A formulation with essential amino acids plus only arginine would neglect many other nonessential amino acids needed for normal metabolism. A mix with essential amino acids and only branched-chain amino acids would similarly omit other nonessential amino acids that support immune function, wound healing, and other processes. Branched-chain amino acids are particularly emphasized in certain liver diseases, not AKI, where a complete amino acid profile is more appropriate.

Therefore, a solution containing essential amino acids and nonessential amino acids provides the most complete substrate pool to support recovery in AKI requiring parenteral nutrition.