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Difficulty: Very hardGastroenterology and Hepatology

A 59-year-old male with chronic hepatitis C virus-induced cirrhosis is brought to the acute care clinic by his daughter due to an acute decline in his cognitive baseline over the last two days. The daughter reports that he has been sleeping extensively during the day and is increasingly disoriented. He has a history of ascites managed with spironolactone and furosemide. He has not had any hospitalizations or healthcare exposures in the past year.

On physical examination, temperature is 37.4°C (99.3°F), blood pressure is 105/65 mm Hg, and pulse is 92/min. The patient is lethargic and oriented only to person. Scleral icterus is present. The abdomen is tensely distended with a positive fluid wave and mild, diffuse tenderness to deep palpation. Rebound tenderness and guarding are absent. Asterixis is elicited upon wrist extension.

Laboratory studies reveal the following:

TestResult
Sodium132 mEq/L
Potassium4.2 mEq/L
Blood urea nitrogen36 mg/dL
Creatinine1.4 mg/dL
Total bilirubin3.2 mg/dL

A diagnostic paracentesis yields cloudy fluid with a total protein of 0.8 g/dL and a leukocyte count of 650/mm³. The differential shows 60% neutrophils and 40% lymphocytes. Gram stain of the fluid is negative.

Which of the following is the most appropriate next step in pharmacotherapy?

  1. Intravenous cefotaxime and intravenous albuminAnswer
  2. B
    Intravenous cefotaxime
  3. C
    Intravenous meropenem and intravenous albumin
  4. D
    Intravenous piperacillin-tazobactam
  5. E
    Intravenous albumin and oral lactulose

Answer

Intravenous cefotaxime and intravenous albumin
The correct answer accurately synthesizes the diagnosis of spontaneous bacterial peritonitis (SBP) and the need for renal protection. SBP is diagnosed when the absolute polymorphonuclear (PMN) cell count in the ascitic fluid is ≥250\geq 250/mm³. In this patient, the count is 650×0.60=390650 \times 0.60 = 390/mm³. The standard empiric treatment for community-acquired SBP is a third-generation cephalosporin, such as intravenous cefotaxime or ceftriaxone. Furthermore, this patient meets the criteria for intravenous albumin administration. The American Association for the Study of Liver Diseases (AASLD) recommends intravenous albumin (1.5 g/kg on day 1 and 1.0 g/kg on day 3) for SBP patients who have any of the following: serum creatinine >1.0> 1.0 mg/dL, blood urea nitrogen (BUN) >30> 30 mg/dL, or total bilirubin >4.0> 4.0 mg/dL. This patient's creatinine (1.41.4 mg/dL) and BUN (3636 mg/dL) both exceed the thresholds, making albumin essential to mitigate the risk of hepatorenal syndrome and mortality.

Step-by-Step Solution

1
Calculate the absolute polymorphonuclear (PMN) cell count in the ascitic fluid.
The PMN count is 650×0.60=390650 \times 0.60 = 390/mm³.
An absolute PMN count ≥250\geq 250/mm³ establishes the diagnosis of spontaneous bacterial peritonitis (SBP).
2
Determine the appropriate antibiotic coverage based on the origin of the infection.
The patient requires a third-generation cephalosporin (e.g., cefotaxime or ceftriaxone).
The patient has no recent hospitalizations, indicating community-acquired SBP, which does not require broad-spectrum pseudomonal or multidrug-resistant coverage.
3
Evaluate the patient's renal function to determine the need for adjuvant therapy.
The patient's BUN is 3636 mg/dL (threshold >30> 30) and creatinine is 1.41.4 mg/dL (threshold >1.0> 1.0). Therefore, intravenous albumin is indicated.
Intravenous albumin significantly reduces the incidence of hepatorenal syndrome and mortality in patients with SBP who have high-risk laboratory features.

Key Concept

Management of Spontaneous Bacterial Peritonitis and Prevention of Hepatorenal Syndrome
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Topics

Gastroenterology and Hepatology

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