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Difficulty: EasyGastroenterology and Hepatology

A 56-year-old man is brought to the emergency department by his wife due to a 2-day history of diffuse abdominal discomfort, subjective fever, and increasing confusion. His medical history is significant for decompensated alcohol-associated cirrhosis. He takes furosemide, spironolactone, and lactulose at home. His temperature is 38.2°C (100.8°F), blood pressure is 102/64 mmHg, pulse is 98/min, and respirations are 16/min. Physical examination demonstrates scleral icterus and multiple spider angiomas on the anterior chest. The abdomen is distended with a positive fluid wave and shifting dullness. There is diffuse, mild abdominal tenderness to palpation, but no rebound tenderness or rigidity is present. Neurologic examination reveals a coarse, flapping tremor when the patient's wrists are extended, and he is oriented to person only. Which of the following is the most appropriate next step in management?

  1. Diagnostic paracentesisAnswer
  2. B
    Intravenous administration of broad-spectrum antibiotics
  3. C
    Immediate exploratory laparotomy
  4. D
    Measurement of serum thyroid-stimulating hormone
  5. E
    Administration of intravenous haloperidol

Answer

The most appropriate next step in management is to perform a diagnostic paracentesis.
The correct answer is diagnostic paracentesis. This patient with decompensated cirrhosis presents with the classic triad of spontaneous bacterial peritonitis (SBP): fever, abdominal pain, and altered mental status (hepatic encephalopathy). Because SBP is highly fatal if left untreated, any patient with ascites and signs of infection or clinical deterioration requires prompt evaluation. The essential first step is diagnostic paracentesis to obtain ascitic fluid for cell count and culture. A diagnosis of SBP is established if the ascitic fluid absolute neutrophil count (ANC) is ≥250/mm3\geq 250/mm^3. Empiric intravenous antibiotics (e.g., a third-generation cephalosporin) should be administered immediately after the fluid is drawn, but never before, as doing so can compromise culture yield.

Step-by-Step Solution

1
Identify the patient's underlying condition and acute presentation.
The patient has decompensated cirrhosis with ascites, presenting with new-onset fever, abdominal pain, and hepatic encephalopathy.
Recognizing the triad of ascites, fever, and altered mental status points directly to a specific infectious complication.
2
Formulate the most likely diagnosis.
The most likely diagnosis is spontaneous bacterial peritonitis (SBP), which frequently precipitates hepatic encephalopathy.
SBP is a common and life-threatening infection of ascitic fluid in patients with cirrhosis.
3
Determine the next best step in management.
A diagnostic paracentesis must be performed immediately.
Ascitic fluid analysis (specifically looking for an absolute neutrophil count ≥250/mm3\geq 250/mm^3) is required to confirm the diagnosis and guide targeted antibiotic therapy.

Key Concept

Patients with cirrhosis and ascites who present with fever, abdominal pain, or altered mental status should immediately undergo diagnostic paracentesis to evaluate for spontaneous bacterial peritonitis prior to initiating empiric antibiotics.
Estimated Time:1m 0s
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Topics

Gastroenterology and Hepatology

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