A 58-year-old man with a history of alcohol-related cirrhosis is brought to the emergency … — USMLE Step 3

A 58-year-old man with a history of alcohol-related cirrhosis is brought to the emergency department by his family due to increasing confusion and lethargy over the past 24 hours. His family reports that he has not had any recent falls, head trauma, vomiting, or dark stools. He has been compliant with his home medications, which include furosemide, spironolactone, and nadolol.

Temperature is $37.9^\circ\text{C}$ ( $100.2^\circ\text{F}$ ), blood pressure is 105/65 mmHg, heart rate is 102/min, and respiratory rate is 16/min. Physical examination reveals a lethargic man who is oriented only to person. Scleral icterus is present. He has prominent abdominal distention with a positive fluid wave and shifting dullness. No focal neurologic deficits are present, but he exhibits a coarse, flapping tremor of the hands when his wrists are actively extended. Digital rectal examination reveals brown, guaiac-negative stool.

Laboratory results:

Test	Result
Hemoglobin	11.2 g/dL
Platelet count	$85,000/\text{mm}^3$
Leukocyte count	$12,500/\text{mm}^3$
Serum sodium	132 mEq/L
Serum potassium	3.8 mEq/L
Serum creatinine	1.1 mg/dL
Total bilirubin	3.5 mg/dL

Which of the following diagnostic steps are indicated to determine the precipitating cause of this patient's acute decompensation? (Select 2)

Diagnostic paracentesisAnswer
Blood cultures, urinalysis, and chest radiographyAnswer
C
Measurement of serum ammonia concentration
D
Noncontrast computed tomography of the head
E
Esophagogastroduodenoscopy

Answer

The correct diagnostic steps are to perform a diagnostic paracentesis and obtain blood cultures, urinalysis, and chest radiography.

The patient presents with acute hepatic encephalopathy (HE), evidenced by lethargy, disorientation, and asterixis in the setting of known alcohol-related cirrhosis. HE is typically triggered by an underlying precipitant, most commonly infections, gastrointestinal bleeding, electrolyte abnormalities, or medication nonadherence. Given the patient's low-grade fever (

37.9^\circ\text{C}

) and leukocytosis (

12,500/\text{mm}^3

), an infectious precipitant is highly likely. Spontaneous bacterial peritonitis (SBP) is a common and frequently asymptomatic infection in cirrhotic patients with ascites; therefore, a diagnostic paracentesis is mandatory to evaluate the ascitic fluid for cell count and culture. Concurrently, a comprehensive infectious workup, including blood cultures, urinalysis, and chest radiography, is indicated as part of the initial test sequencing to identify other common sources of infection such as bacteremia, urinary tract infections, or pneumonia.

Step-by-Step Solution

Identify the primary clinical syndrome.

The patient presents with acute hepatic encephalopathy, characterized by confusion, lethargy, and asterixis in the setting of cirrhosis.

Establishing the primary presentation guides the search for a precipitating cause.

Analyze vital signs and laboratory data for clues to the precipitant.

The presence of a low-grade fever (

37.9^\circ\text{C}

) and leukocytosis (

12,500/\text{mm}^3

) points strongly toward an infectious trigger.

Infections are the most common precipitants of hepatic encephalopathy and require immediate identification.

Select the appropriate diagnostic tests based on the suspected trigger.

Diagnostic paracentesis, along with blood cultures, urinalysis, and chest radiography, are ordered.

These non-invasive and minimally invasive tests comprehensively screen for the most common infectious sources (spontaneous bacterial peritonitis, bacteremia, urinary tract infections, pneumonia) without delaying stabilization.

Key Concept

In patients with cirrhosis presenting with acute hepatic encephalopathy, an immediate diagnostic workup to identify the precipitating cause is required. This involves prioritizing a comprehensive infectious evaluation (including diagnostic paracentesis and pan-culture) and avoiding unnecessary tests like serum ammonia or neuroimaging in the absence of focal findings.

Estimated Time:1m 30s

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