A 72-year-old woman is evaluated on postoperative day 4 following an open reduction and in… — USMLE Step 2 CK

A 72-year-old woman is evaluated on postoperative day 4 following an open reduction and internal fixation of a right femoral neck fracture. Her medical history includes chronic obstructive pulmonary disease (COPD) and heart failure with preserved ejection fraction. On postoperative day 2, she developed a fever of $38.7^\circ\text{C}$ ( $101.7^\circ\text{F}$ ) and a productive cough. A chest radiograph demonstrated a new left lower lobe consolidation. She was empirically started on intravenous vancomycin and cefepime. Today, her fever has resolved, but she reports new-onset orthopnea and worsening shortness of breath over the last 12 hours. Her blood pressure is $135/85\text{ mmHg}$ , pulse is $98/\text{min}$ , and oxygen saturation is $92\%$ on room air. Physical examination reveals elevated jugular venous pressure and bilateral basilar crackles without wheezing. There is 2+ bilateral lower extremity pitting edema. Sputum cultures from two days ago have finalized, showing heavy growth of Streptococcus pneumoniae that is exquisitely sensitive to ceftriaxone. Which of the following are the most appropriate next steps in the management of this patient? (Select 2)

De-escalate the current antibiotic regimen to targeted monotherapy with intravenous ceftriaxoneAnswer
Administer an intravenous loop diuretic to manage acute volume overloadAnswer
C
Continue the current empiric regimen of vancomycin and cefepime to prevent hospital-acquired superinfections
D
Administer systemic corticosteroids and short-acting bronchodilators for an acute exacerbation of chronic obstructive pulmonary disease
E
Discontinue all antibiotics and prioritize incentive spirometry, as the prior fever was likely secondary to benign postoperative atelectasis

Answer

The most appropriate next steps are to de-escalate the antibiotic regimen to targeted monotherapy with ceftriaxone and to administer an intravenous loop diuretic to treat acute decompensated heart failure.

The patient is experiencing two distinct clinical issues on postoperative day 4. First, she is recovering from a documented postoperative pneumonia. Now that the sputum culture has finalized and identified a specific, susceptible pathogen (Streptococcus pneumoniae), standard antimicrobial stewardship principles require de-escalating her empiric broad-spectrum coverage (vancomycin and cefepime) to targeted therapy (ceftriaxone). Second, the patient has developed new-onset orthopnea, elevated jugular venous pressure, and bilateral basilar crackles, which are classic signs of acute decompensated heart failure (ADHF) secondary to volume overload. Postoperative fluid shifts and intravenous fluid administration frequently precipitate ADHF in patients with a history of heart failure. The most appropriate management for this acute volume overload is diuresis with an intravenous loop diuretic (e.g., furosemide).

Step-by-Step Solution

Interpret the finalized sputum culture and sensitivity report.

Identifies a single pathogen (Streptococcus pneumoniae) that is highly sensitive to a narrower-spectrum agent (ceftriaxone).

Principles of antimicrobial stewardship dictate narrowing therapy once the specific pathogen is identified to reduce resistance and limit toxicity.

Evaluate the clinical signs associated with the new-onset respiratory distress.

The presence of elevated jugular venous pressure, orthopnea, bilateral basilar crackles, and peripheral edema strongly indicate acute volume overload.

Distinguishing acute decompensated heart failure from a COPD exacerbation directs the appropriate targeted therapy, which in this case is prompt diuresis.

Key Concept

Integration of antimicrobial stewardship and management of postoperative fluid shifts in patients with cardiopulmonary comorbidities.

Estimated Time:2m 0s

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