A 58-year-old woman is brought to the emergency department by her family due to increased … — USMLE Step 3

A 58-year-old woman is brought to the emergency department by her family due to increased confusion and severe abdominal pain over the past 24 hours. She has a history of decompensated alcoholic cirrhosis and was recently discharged after treatment for esophageal varices. Her home medications include lactulose, rifaximin, spironolactone, furosemide, and propranolol.

Temperature is 38.4°C (101.1°F), blood pressure is 86/54 mmHg, pulse is 114/min, and respirations are 22/min. Physical examination reveals scleral icterus, spider angiomas, and a markedly distended abdomen with a positive fluid wave. There is diffuse, severe abdominal tenderness to palpation without rebound or guarding. Asterixis is present.

Laboratory studies show:
Leukocyte count: $14,500/\mu L$
Platelet count: $88,000/\mu L$
Serum sodium: $132 \text{ mEq/L}$
Serum potassium: $5.3 \text{ mEq/L}$
Serum creatinine: $2.1 \text{ mg/dL}$ (baseline $1.0 \text{ mg/dL}$ )
Blood urea nitrogen: $52 \text{ mg/dL}$

Diagnostic paracentesis yields turbid ascitic fluid with a total nucleated cell count of $1,200/\mu L$ and $85\%$ neutrophils ( $1,020 \text{ PMNs}/\mu L$ ).

Which of the following pharmacologic interventions are indicated for this patient? (Select all that apply)

Initiate intravenous cefotaximeAnswer
Administer intravenous albuminAnswer
Discontinue home propranololAnswer
D
Initiate intravenous piperacillin-tazobactam
E
Continue home spironolactone and furosemide

Answer

The correct interventions are to initiate intravenous cefotaxime, administer intravenous albumin, and discontinue home propranolol.

The patient's clinical presentation and ascitic fluid neutrophil count (

1,020 \text{ PMNs}/\mu L

) confirm the diagnosis of spontaneous bacterial peritonitis (SBP), which is further complicated by an acute kidney injury (AKI) and hypotension. Optimal pharmacologic management requires three simultaneous interventions. First, empiric antimicrobial therapy must be initiated with a third-generation cephalosporin (e.g., intravenous cefotaxime) to adequately cover the most common causative organisms, including Escherichia coli, Klebsiella pneumoniae, and Streptococcus species. Second, intravenous albumin should be administered because it significantly reduces the incidence of hepatorenal syndrome and improves mortality in patients with SBP, especially those with baseline renal impairment (creatinine

> 1.0 \text{ mg/dL}

or BUN

> 30 \text{ mg/dL}

). Finally, rigorous medication reconciliation is critical: non-selective beta-blockers (propranolol) must be discontinued in cirrhotic patients who develop hypotension, AKI, or SBP. Beta-blockers inhibit the necessary compensatory increase in cardiac output during stress and are associated with increased mortality in this precise setting.

Step-by-Step Solution

Evaluate the clinical presentation and paracentesis results.

Ascitic fluid with >250 PMNs/microL confirms the diagnosis of spontaneous bacterial peritonitis (SBP).

To establish the primary infectious diagnosis driving the patient's decompensation.

Evaluate the patient's renal function and hemodynamics.

The patient has an acute kidney injury (creatinine increased from 1.0 to 2.1 mg/dL) and systemic hypotension.

SBP frequently triggers hepatorenal syndrome and profound vasodilation, requiring specific adjunctive therapies and critical medication adjustments.

Select appropriate empiric antimicrobial therapy.

Initiate an intravenous third-generation cephalosporin such as cefotaxime.

Third-generation cephalosporins are first-line for community-acquired SBP to adequately cover enteric gram-negative rods and streptococci.

Determine necessary adjunctive therapies based on end-organ parameters.

Administer intravenous albumin.

Albumin expansion prevents hepatorenal syndrome and improves overall survival in SBP, with an absolute indication for patients with a BUN >30 mg/dL or creatinine >1.0 mg/dL.

Perform immediate medication reconciliation.

Discontinue home propranolol, spironolactone, and furosemide.

Beta-blockers blunt compensatory cardiac output during hypotensive stress in cirrhosis, thereby increasing mortality. Diuretics directly worsen volume depletion and acute kidney injury.

Key Concept

Simultaneous medical management of spontaneous bacterial peritonitis (SBP) involves empiric third-generation cephalosporins, intravenous albumin to prevent hepatorenal syndrome, and the immediate discontinuation of hemodynamically detrimental home medications such as non-selective beta-blockers and diuretics.

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