Emergency medical services bring a 54-year-old male to the resuscitation bay for altered m… — USMLE Step 3

Emergency medical services bring a 54-year-old male to the resuscitation bay for altered mental status and diffuse abdominal pain. His family members, who accompanied him, note that he has a history of severe alcohol use disorder and decompensated cirrhosis. Over the past 24 hours, he has become increasingly confused and feverish. He has not had any recent hematemesis or melena. His home medications include spironolactone, furosemide, propranolol, and lactulose.

Temperature is $38.4^\circ\text{C}$ ( $101.1^\circ\text{F}$ ), blood pressure is $92/56\text{ mm Hg}$ , pulse is $108/\text{min}$ , and respiratory rate is $18/\text{min}$ . Physical examination reveals scleral icterus, spider angiomas, and a distended, diffusely tender abdomen with shifting dullness. He is oriented only to person and exhibits asterixis.

Laboratory studies show:

Test	Result
Hemoglobin	$11.2\text{ g/dL}$
Leukocyte count	$12,500/\text{mm}^3$
Platelet count	$88,000/\text{mm}^3$
Sodium	$131\text{ mEq/L}$
Potassium	$4.2\text{ mEq/L}$
Blood urea nitrogen	$46\text{ mg/dL}$
Serum creatinine	$1.9\text{ mg/dL}$ (baseline $0.8\text{ mg/dL}$ )
Total bilirubin	$3.5\text{ mg/dL}$

Diagnostic paracentesis yields cloudy ascitic fluid with a total nucleated cell count of $800/\text{mm}^3$ and $80\%$ neutrophils.

Which of the following pharmacologic interventions are appropriate at this time? (Select all that apply)

Initiate intravenous cefotaximeCevap
Administer intravenous albuminCevap
Discontinue oral propranololCevap
D
Initiate intravenous gentamicin
E
Initiate oral midodrine and subcutaneous octreotide
F
Maintain the current regimen of spironolactone and furosemide

Cevap

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

This patient presents with spontaneous bacterial peritonitis (SBP), complicated by acute kidney injury (AKI) and hypotension. Management requires a multi-pronged, simultaneous pharmacologic approach. First, empiric antibiotic therapy with a third-generation cephalosporin (such as cefotaxime or ceftriaxone) is the standard of care to target typical enteric pathogens. Second, this patient has a high risk of developing hepatorenal syndrome (HRS) due to an elevated creatinine (

>1.0\text{ mg/dL}

) and BUN (

>30\text{ mg/dL}

). In this setting, intravenous albumin administration (

1.5\text{ g/kg}

on day 1, followed by

1.0\text{ g/kg}

on day 3) is indicated to expand intravascular volume, prevent HRS, and reduce mortality. Finally, current clinical guidelines strongly recommend discontinuing non-selective beta-blockers (such as propranolol) and holding diuretics (spironolactone and furosemide) in patients with cirrhosis who develop SBP, sepsis, hypotension, or AKI. Continuing these agents can further reduce renal perfusion, exacerbate hypotension, and precipitate irreversible hepatorenal syndrome.

Adım Adım Çözüm

Diagnose Spontaneous Bacterial Peritonitis (SBP).

The absolute neutrophil count in the ascitic fluid is calculated as

800 \times 0.80 = 640/\text{mm}^3

An ascitic fluid neutrophil count

\ge 250/\text{mm}^3

is diagnostic for SBP and requires immediate empiric antimicrobial therapy.

Select appropriate empiric antibiotic therapy.

Intravenous cefotaxime is selected.

Third-generation cephalosporins effectively cover the most common enteric gram-negative organisms and Streptococcus species responsible for community-acquired SBP.

Assess the indications for intravenous albumin administration.

Intravenous albumin is selected as an adjunctive intervention.

The patient meets the high-risk criteria for developing hepatorenal syndrome (HRS) due to a serum creatinine

> 1.0\text{ mg/dL}

and BUN

> 30\text{ mg/dL}

. Albumin expands the effective arterial blood volume and significantly reduces mortality.

Reconcile the patient's home medication list based on the acute presentation.

Oral propranolol is discontinued, and diuretics are held.

Non-selective beta-blockers and diuretics are contraindicated in the setting of SBP with concurrent hypotension and acute kidney injury because they further compromise renal perfusion and precipitate severe hepatorenal syndrome.

Anahtar Kavram

Simultaneous pharmacologic management of Spontaneous Bacterial Peritonitis (SBP) with concomitant acute kidney injury requires empiric antibiotics, intravenous albumin, and the withdrawal of offending home medications like non-selective beta-blockers and diuretics.

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Cevap

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Anahtar Kavram

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