A 58-year-old man is admitted to the hospital with a 2-day history of diffuse abdominal pa… — USMLE Step 3

A $58$ -year-old man is admitted to the hospital with a $2$ -day history of diffuse abdominal pain, fever, and confusion. He has a history of decompensated alcohol-associated cirrhosis. His current medications include furosemide, spironolactone, and nadolol. Temperature is $38.1^\circ\text{C}$ ( $100.6^\circ\text{F}$ ), blood pressure is $96/60\text{ mm Hg}$ , pulse is $102/\text{min}$ , and respirations are $18/\text{min}$ . Physical examination reveals scleral icterus, spider angiomata, and a distended, diffusely tender abdomen with shifting dullness. Mild asterixis is present.

Laboratory results:
Hemoglobin: $10.2\text{ g/dL}$
Platelet count: $88,000/\text{mm}^3$
Leukocyte count: $11,500/\text{mm}^3$
Blood urea nitrogen: $36\text{ mg/dL}$
Serum creatinine: $1.8\text{ mg/dL}$ (baseline $1.0\text{ mg/dL}$ )
Total bilirubin: $3.4\text{ mg/dL}$
INR: $1.7$

Diagnostic paracentesis yields cloudy ascitic fluid with a polymorphonuclear leukocyte count of $650/\text{mm}^3$ . Intravenous cefotaxime is initiated, and his home medications are temporarily withheld. Which of the following is the most appropriate additional pharmacologic intervention at this time?

Intravenous albuminAnswer
B
Intravenous fresh frozen plasma
C
Intravenous vancomycin
D
Oral propranolol
E
Oral rifaximin

Answer

Intravenous albumin

The correct answer is intravenous albumin. This patient has spontaneous bacterial peritonitis (SBP), diagnosed by an ascitic fluid PMN count

>250/\text{mm}^3

. While empiric antibiotic therapy (e.g., third-generation cephalosporin like cefotaxime) is the crucial first step, patients with SBP are at significant risk for developing hepatorenal syndrome (HRS) due to systemic vasodilation and reduced effective arterial blood volume. The risk of HRS and mortality is highest in patients with preexisting or concurrent renal dysfunction. Guidelines strictly recommend the administration of intravenous albumin (

1.5\text{ g/kg}

on day 1, and

1.0\text{ g/kg}

on day 3) for SBP patients who meet any of the following criteria: serum creatinine

>1.0\text{ mg/dL}

, blood urea nitrogen

>30\text{ mg/dL}

, or total bilirubin

>4.0\text{ mg/dL}

. This patient meets the criteria with a creatinine of

1.8\text{ mg/dL}

and BUN of

36\text{ mg/dL}

. Albumin provides prolonged oncotic support, improving renal perfusion and significantly reducing the incidence of HRS and short-term mortality.

Step-by-Step Solution

Diagnose the acute condition based on clinical presentation and ascitic fluid analysis.

The patient has spontaneous bacterial peritonitis (SBP), confirmed by an ascitic fluid polymorphonuclear leukocyte (PMN) count

>250/\text{mm}^3

Accurate diagnosis is required to initiate the correct standard-of-care protocol.

Assess the patient's renal function and hemodynamic status.

The patient has acute kidney injury (AKI) with a serum creatinine of

1.8\text{ mg/dL}

(baseline

1.0\text{ mg/dL}

), an elevated BUN of

36\text{ mg/dL}

, and borderline hypotension.

Renal impairment in the setting of SBP places the patient at high risk for developing hepatorenal syndrome (HRS).

Determine the necessary pharmacologic interventions beyond empiric antibiotics.

In addition to cefotaxime, the administration of intravenous albumin is indicated.

Guidelines recommend IV albumin for SBP patients with Cr

>1.0\text{ mg/dL}

, BUN

>30\text{ mg/dL}

, or total bilirubin

>4.0\text{ mg/dL}

to expand effective circulating volume and prevent HRS.

Key Concept

Patients with spontaneous bacterial peritonitis (SBP) who have concurrent renal dysfunction (creatinine

>1.0\text{ mg/dL}

or BUN

>30\text{ mg/dL}

) require intravenous albumin supplementation in addition to antibiotics to prevent hepatorenal syndrome and reduce mortality.

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