A 59-year-old woman is admitted to the hospital with a 4-day history of worsening abdomina… — USMLE Step 3

A 59-year-old woman is admitted to the hospital with a 4-day history of worsening abdominal distention, increased lethargy, and confusion. She has a history of cirrhosis secondary to nonalcoholic steatohepatitis.

Home medications:
Spironolactone $100\text{ mg}$ daily
Furosemide $40\text{ mg}$ daily
Nadolol $40\text{ mg}$ daily

Vitals:
Temperature: $38.1^\circ\text{C}$ ( $100.6^\circ\text{F}$ )
Blood pressure: $96/54\text{ mmHg}$
Pulse: $108/\text{min}$
Respirations: $18/\text{min}$

Physical examination reveals scleral icterus and a distended abdomen with shifting dullness and diffuse mild tenderness to palpation. Neurologic examination is notable for lethargy, disorientation to time and place, and a bilateral flapping tremor of the hands when the wrists are extended.

Laboratory results:
Hemoglobin: $10.2\text{ g/dL}$
Platelet count: $78,000/\text{mm}^3$
Leukocyte count: $11,500/\text{mm}^3$
Sodium: $131\text{ mEq/L}$
Potassium: $3.4\text{ mEq/L}$
Blood urea nitrogen: $38\text{ mg/dL}$
Creatinine: $1.8\text{ mg/dL}$ (baseline $0.9\text{ mg/dL}$ )
Total bilirubin: $4.2\text{ mg/dL}$
International normalized ratio (INR): $1.9$

Diagnostic paracentesis is performed, yielding cloudy yellow fluid. Ascitic fluid analysis reveals an absolute neutrophil count of $450/\text{mm}^3$ .

Which of the following pharmacologic interventions should be initiated in this patient? (Select all that apply)

Intravenous cefotaximeAnswer
Intravenous albuminAnswer
Oral lactuloseAnswer
D
Intravenous furosemide
E
Intravenous fresh frozen plasma

Answer

The correct interventions are intravenous cefotaxime, intravenous albumin, and oral lactulose.

The correct options comprise the standard multi-modal therapy for this patient's decompensated cirrhosis. The ascitic fluid absolute neutrophil count of

450/\text{mm}^3

confirms spontaneous bacterial peritonitis (SBP), which requires immediate empiric treatment with a third-generation cephalosporin, such as intravenous cefotaxime. Additionally, patients with SBP are at high risk for developing hepatorenal syndrome due to splanchnic vasodilation and effective arterial blood volume depletion. Intravenous albumin is indicated to prevent this complication in SBP patients who meet specific high-risk criteria (creatinine

> 1.0\text{ mg/dL}

, BUN

> 30\text{ mg/dL}

, or total bilirubin

> 4.0\text{ mg/dL}

); this patient meets all three. Finally, the patient's confusion, lethargy, and asterixis (flapping tremor) indicate concurrent hepatic encephalopathy, which is often precipitated by infections like SBP. Oral lactulose is the first-line pharmacologic intervention to reduce intestinal ammonia absorption and improve neurologic status.

Step-by-Step Solution

Evaluate the clinical presentation and laboratory findings to identify all acute complications of cirrhosis.

The patient has spontaneous bacterial peritonitis (ascitic neutrophil count

\ge 250/\text{mm}^3

), hepatic encephalopathy (asterixis, lethargy), and acute kidney injury (creatinine increased to

1.8\text{ mg/dL}

from a baseline of

0.9\text{ mg/dL}

Accurate diagnosis of concurrent complications is required to select appropriate multi-modal pharmacologic therapy.

Select the appropriate pharmacologic intervention for spontaneous bacterial peritonitis (SBP).

Intravenous cefotaxime is indicated.

Third-generation cephalosporins are the recommended first-line empiric antimicrobial therapy for SBP.

Assess the need for adjuvant therapy to prevent hepatorenal syndrome in the setting of SBP.

Intravenous albumin is indicated.

Guidelines strongly recommend albumin infusion for SBP patients who meet specific high-risk criteria (creatinine

> 1.0\text{ mg/dL}

, BUN

> 30\text{ mg/dL}

, or total bilirubin

> 4.0\text{ mg/dL}

). This patient meets all three criteria.

Select the appropriate pharmacologic intervention for hepatic encephalopathy.

Oral lactulose is indicated.

Lactulose reduces intestinal ammonia production and absorption, serving as the first-line medical treatment for hepatic encephalopathy.

Identify and exclude contraindicated or inappropriate interventions.

Furosemide and fresh frozen plasma should not be initiated.

Diuretics will worsen the acute kidney injury and hypoperfusion. Fresh frozen plasma is unnecessary for an isolated elevated INR without active bleeding.

Key Concept

Pharmacologic management of decompensated cirrhosis with spontaneous bacterial peritonitis (SBP) requires immediate empiric antibiotics (e.g., cefotaxime), intravenous albumin for renal protection, and lactulose for concurrent hepatic encephalopathy, while avoiding medications that exacerbate renal hypoperfusion.

Estimated Time:2m 0s

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