A client with severe heart failure develops elevated blood urea nitrogen (BUN) and creatinine levels. The nurse will plan care to meet the goal of

A. preventing hypertension: While managing blood pressure is important in heart failure, the immediate concern with elevated BUN and creatinine is renal perfusion, not hypertension. Blood pressure control alone does not correct the underlying cause of kidney injury.

B. diluting nephrotoxic substances: Dilution may reduce risk from nephrotoxins, but in heart failure, fluid overload is a concern. This approach does not address the primary issue of reduced renal perfusion caused by low cardiac output.

C. replacing fluid volume: Fluid replacement in severe heart failure could worsen pulmonary edema and increase cardiac workload. The problem is not fluid deficit but inadequate perfusion to the kidneys due to poor cardiac output.

D. maintaining adequate cardiac output: Elevated BUN and creatinine in heart failure indicate reduced renal perfusion. Ensuring adequate cardiac output improves blood flow to the kidneys, supporting filtration and preventing further renal injury. This is the priority goal in care planning.

A. creatinine level, blood urea nitrogen (BUN) level, and urine specific gravity: These values directly reflect renal perfusion and kidney function. A low MAP of 50 mmHg reduces renal blood flow, causing rising creatinine and BUN levels, while urine specific gravity helps determine whether kidneys can concentrate urine appropriately during acute kidney injury.

B. alkaline phosphatase level, creatinine level, and blood urea nitrogen level: Alkaline phosphatase is a liver and biliary enzyme and does not help assess acute kidney injury. Although creatinine and BUN are relevant, the inclusion of alkaline phosphatase makes this combination less useful for evaluating renal damage.

C. urine specific gravity, albumin level, and alkaline phosphatase level: Urine specific gravity is helpful, but albumin and alkaline phosphatase reflect nutritional or hepatic status rather than renal perfusion. These do not provide the needed information to determine acute kidney injury onset.

D. serum albumin level, alkaline phosphatase level, and blood urea nitrogen level: Albumin and alkaline phosphatase are not indicators of kidney function. BUN alone cannot determine acute kidney injury without creatinine or urine concentration data.