AKI case: Mrs. Davies's labs and nursing priorities

Frame the interpretation around the standard classification, because every question in the case depends on it. Acute kidney injury is prerenal, intrinsic or postrenal, and Mrs. Davies's history contains candidates for more than one. Decompensated heart failure reduces renal perfusion and produces prerenal injury; long-standing diabetes and hypertension predispose to intrinsic disease; and her admission that she has not been taking her medications regularly cuts both ways, since stopping a diuretic worsens congestion while stopping antihypertensives leaves pressure uncontrolled. So the laboratory interpretation is not a matter of reading values in isolation but of asking which pattern they form. The urea-to-creatinine relationship, the urine sodium and fractional excretion of sodium, urine specific gravity and the urinalysis sediment are the discriminators, and the answer should say what each would show under each mechanism rather than only reporting the numbers given. Saying what a value would look like under the mechanism you are rejecting is what turns a list of results into an interpretation.

The clinical picture points strongly toward volume overload rather than depletion: she reports puffiness in her legs and hands, she has not been urinating much, and she has four days of increasing breathlessness on a background of heart failure. That combination — oedema, reduced urine output and dyspnoea — is what makes fluid retention the focus of the final two questions, and it also constrains the interventions. Priority nursing diagnoses should be written properly, with the problem, the related factor and the evidence from this patient, and excess fluid volume related to compromised regulatory mechanisms is the obvious first. The interventions then follow directly: daily weights at the same time on the same scale as the most sensitive measure, strict intake and output, fluid and sodium restriction as ordered, respiratory assessment, positioning, skin care over oedematous areas, and monitoring electrolytes. Say why daily weight beats intake and output charts, because that reasoning is what is being tested.