A 58-year-old man with a history of alcohol-related cirrhosis is evaluated in the clinic f… — USMLE Step 3

A 58-year-old man with a history of alcohol-related cirrhosis is evaluated in the clinic for a follow-up visit. One week ago, he presented with tense ascites and newly developed bilateral 2+ pitting lower extremity edema. At that time, a sodium-restricted diet was reinforced, and he was prescribed spironolactone $100\text{ mg}$ and furosemide $40\text{ mg}$ daily. Today, the patient reports feeling generally well but notes increased thirst and a dry mouth. He denies abdominal pain, fever, confusion, or gastrointestinal bleeding. His weight has decreased by $7\text{ kg}$ ( $15.4\text{ lbs}$ ) since his visit one week ago. Blood pressure is $102/64\text{ mmHg}$ and pulse is $92/\text{min}$ . Physical examination shows mild residual abdominal distention with a positive fluid wave, but his lower extremity edema has completely resolved.

Laboratory results obtained today are compared to those from one week ago:

Laboratory Test	One Week Ago	Today
Sodium	$136\text{ mEq/L}$	$132\text{ mEq/L}$
Potassium	$4.2\text{ mEq/L}$	$4.8\text{ mEq/L}$
Blood urea nitrogen	$18\text{ mg/dL}$	$48\text{ mg/dL}$
Creatinine	$0.8\text{ mg/dL}$	$1.9\text{ mg/dL}$

Which of the following is the most appropriate next step in the management of this patient?

Discontinue both spironolactone and furosemideAnswer
B
Decrease the doses to spironolactone 50 mg and furosemide 20 mg daily
C
Perform an outpatient large-volume paracentesis
D
Initiate therapy with lisinopril
E
Discontinue furosemide and increase spironolactone to 200 mg daily

Answer

The most appropriate next step is to discontinue both spironolactone and furosemide.

This patient has developed a severe acute kidney injury (AKI) secondary to overly rapid diuresis. While a weight loss of

1\text{ kg/day}

can be safe when peripheral edema is present, his edema has now completely resolved. Continued aggressive diuresis has mobilized fluid from the intravascular space, leading to hypovolemia, a markedly elevated blood urea nitrogen level, and a serum creatinine that has more than doubled from baseline. In a patient with decompensated cirrhosis, any significant AKI requires the immediate discontinuation of all diuretics (both spironolactone and furosemide) and any other nephrotoxic medications to restore renal perfusion and prevent the development of hepatorenal syndrome.

Step-by-Step Solution

Analyze the patient's clinical signs and weight trend.

The patient lost

7\text{ kg}

7

days. While

1\text{ kg/day}

is acceptable when peripheral edema is present, the edema has completely resolved, leading to intravascular volume contraction (evidenced by dry mouth and borderline blood pressure).

Tracking fluid compartments is essential in cirrhosis management to ensure diuresis targets extracellular fluid and not the intravascular space.

Interpret the comparative laboratory results.

The BUN has risen significantly, and the serum creatinine has more than doubled from

0.8\text{ mg/dL}

1.9\text{ mg/dL}

These findings confirm a diagnosis of prerenal acute kidney injury (AKI) secondary to aggressive diuresis.

Determine the necessary treatment modification based on the AKI diagnosis.

Both spironolactone and furosemide must be held immediately.

Continuing diuretics during an episode of AKI in a cirrhotic patient greatly increases the risk of progression to life-threatening hepatorenal syndrome.

Key Concept

Patients with cirrhosis and ascites who develop acute kidney injury (AKI) during diuresis must have all diuretic medications immediately discontinued to prevent progression to hepatorenal syndrome.

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