A 62-year-old man with a history of alcohol-associated cirrhosis is brought to the emergen… — USMLE Step 2 CK

A $62$ -year-old man with a history of alcohol-associated cirrhosis is brought to the emergency department by his daughter due to increasing confusion and sleepiness over the past two days. She reports that he has also had a productive cough with yellowish sputum and intermittent chills for the last three days. His medical history includes chronic obstructive pulmonary disease (COPD) and diet-controlled type 2 diabetes mellitus. His temperature is $38.6^\circ\text{C}$ ( $101.5^\circ\text{F}$ ), blood pressure is $105/65\text{ mmHg}$ , pulse is $108/\text{min}$ , and respirations are $24/\text{min}$ . Pulse oximetry shows $92\%$ on room air. Physical examination reveals scleral icterus and spider angiomas. His breath has a sweet, musty odor. Auscultation of the lungs reveals crackles and bronchial breath sounds in the right lower lung field. Abdominal examination shows distension with shifting dullness but no tenderness or rigidity. Neurological examination reveals lethargy, disorientation to time and place, and a distinct flapping tremor when his arms are extended with wrists dorsiflexed. Laboratory studies show a leukocyte count of $14,500/\text{mm}^3$ , hemoglobin of $11.2\text{ g/dL}$ , and a platelet count of $85,000/\text{mm}^3$ . Comprehensive metabolic panel is notable for a blood urea nitrogen of $22\text{ mg/dL}$ , creatinine of $1.0\text{ mg/dL}$ , and normal electrolytes. Arterial blood gas on room air shows a pH of $7.48$ , pCO $_2$ of $30\text{ mmHg}$ , and pO $_2$ of $68\text{ mmHg}$ . Diagnostic paracentesis yields ascitic fluid with an absolute neutrophil count of $120/\text{mm}^3$ and negative Gram stain. A chest radiograph demonstrates a right lower lobe infiltrate. In addition to initiating lactulose therapy for his hepatic encephalopathy, which of the following is the most appropriate next step in management?

Administration of ceftriaxone and azithromycinCevap
B
Administration of intravenous piperacillin-tazobactam
C
Administration of intravenous furosemide and noninvasive positive-pressure ventilation
D
Intravenous infusion of sodium bicarbonate
E
Surgical consultation for exploratory laparotomy

Cevap

The most appropriate next step is the administration of targeted empirical antibiotics, such as ceftriaxone and azithromycin, to treat the community-acquired pneumonia that is precipitating his hepatic encephalopathy.

The correct approach involves initiating targeted empirical antibiotics for community-acquired pneumonia (CAP). This patient presents with classic signs of hepatic encephalopathy (altered mental status, asterixis, fetor hepaticus). In patients with cirrhosis, encephalopathy is almost always triggered by a precipitating event. The clinical findings of a productive cough, fever, localized right lower lobe crackles, and an infiltrate on chest radiograph confirm CAP as the specific precipitant. While lactulose is given to lower serum ammonia levels, definitive management requires treating the underlying trigger. Standard empirical therapy for CAP in a non-ICU setting includes a beta-lactam (like ceftriaxone) and a macrolide (like azithromycin).

Adım Adım Çözüm

Identify the primary diagnosis based on the clinical presentation.

The patient has hepatic encephalopathy, characterized by altered mental status, asterixis, and a sweet, musty breath odor (fetor hepaticus) in the setting of known cirrhosis.

Recognizing the primary syndrome is necessary to determine the required therapeutic interventions.

Determine the precipitating cause of the hepatic encephalopathy.

The patient's fever, productive cough, localized right lower lobe crackles, and chest radiograph infiltrate point to community-acquired pneumonia (CAP). Ascitic fluid analysis rules out spontaneous bacterial peritonitis (PMNs < 250/mm³).

Hepatic encephalopathy is typically triggered by an underlying stressor such as infection, gastrointestinal bleeding, or electrolyte imbalance. The precipitant must be treated for the encephalopathy to resolve.

Select the appropriate targeted treatment for the precipitant.

Targeted empirical antibiotics for CAP, such as a combination of a third-generation cephalosporin and a macrolide, should be administered.

Treating the underlying pneumonia will reduce the systemic inflammatory response and help reverse the hepatic encephalopathy alongside standard ammonia-lowering therapy.

Anahtar Kavram

Hepatic encephalopathy is frequently triggered by specific precipitants such as infections (e.g., pneumonia, spontaneous bacterial peritonitis), gastrointestinal bleeding, or electrolyte abnormalities. Identifying and treating the specific precipitant with targeted therapy is essential for patient recovery.

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