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Zorluk: OrtaGastroenterology and Hepatology

A 62-year-old man with a history of alcohol-related cirrhosis is brought to the emergency department by his family due to worsening confusion and increased abdominal swelling over the past 3 days. His temperature is 38.2°C (100.8°F), pulse is 98/min, and blood pressure is 100/60 mm Hg. Physical examination reveals scleral icterus and a distended abdomen with a positive fluid wave. There is diffuse, mild abdominal tenderness without rebound or guarding. Neurologic examination shows bilateral asterixis. Laboratory studies show a serum albumin of 2.5 g/dL and creatinine of 1.4 mg/dL. A diagnostic paracentesis is performed, yielding cloudy fluid with the following analysis:

ParameterValue
Total protein1.1 g/dL
Albumin0.5 g/dL
Leukocyte count700/mm³
Neutrophils60%

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

  1. Intravenous cefotaximeCevap
  2. B
    Intravenous piperacillin-tazobactam
  3. C
    Intravenous vancomycin
  4. D
    Oral rifaximin and lactulose
  5. E
    Urgent exploratory laparotomy

Cevap

Intravenous cefotaxime
The most appropriate next step in management is the administration of an intravenous third-generation cephalosporin, such as cefotaxime. This patient with a history of cirrhosis presents with fever, abdominal pain, and altered mental status (hepatic encephalopathy), which are hallmark clinical signs of spontaneous bacterial peritonitis (SBP). The diagnosis of SBP is established when the absolute polymorphonuclear (PMN) cell count in the ascitic fluid is ≥250/mm3\geq 250\text{/mm}^3. In this scenario, the PMN count is calculated by multiplying the total leukocyte count by the neutrophil percentage (700×0.60=420/mm3700 \times 0.60 = 420\text{/mm}^3). Because SBP is most frequently caused by enteric Gram-negative organisms (such as *Escherichia coli* and *Klebsiella pneumoniae*) and occasionally Gram-positive organisms (such as *Streptococcus pneumoniae*), empiric therapy with an intravenous third-generation cephalosporin provides the optimal targeted antimicrobial coverage and achieves excellent concentrations in the ascitic fluid.

Adım Adım Çözüm

1
Analyze the ascitic fluid results to calculate the absolute polymorphonuclear (PMN) cell count.
The PMN count is calculated by multiplying the total leukocyte count by the percentage of neutrophils (700×0.60=420/mm3700 \times 0.60 = 420\text{/mm}^3).
An absolute PMN count is required to differentiate sterile ascites from infected ascites.
2
Interpret the PMN count in the clinical context of a patient with cirrhosis, ascites, fever, and encephalopathy.
A PMN count ≥250/mm3\geq 250\text{/mm}^3 establishes the diagnosis of Spontaneous Bacterial Peritonitis (SBP).
SBP is a severe infection of ascitic fluid without an obvious intra-abdominal surgically treatable source, commonly triggering hepatic encephalopathy.
3
Select the appropriate evidence-based empiric pharmacotherapy for SBP.
An intravenous third-generation cephalosporin, such as cefotaxime, is the treatment of choice.
This class provides excellent coverage against the most common causative organisms, which are enteric Gram-negative bacteria (e.g., E. coli, Klebsiella).

Anahtar Kavram

Spontaneous bacterial peritonitis (SBP) is diagnosed by an ascitic fluid absolute polymorphonuclear (PMN) cell count of ≥250/mm3\geq 250\text{/mm}^3 and requires prompt empiric therapy with an intravenous third-generation cephalosporin.
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Gastroenterology and Hepatology

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