Examkin

Question

Difficulty: MediumPreoperative and Postoperative Care

Surgical team rounds are being conducted on a 71-year-old male patient who is currently recovering six days after an elective open abdominal aortic aneurysm repair. His past medical history is notable for diet-controlled type 2 diabetes and mild chronic obstructive pulmonary disease.

Seventy-two hours after his surgery, he experienced acute tachypnea, a productive cough, and a temperature spike to 38.7°C (101.7°F). Portable chest imaging confirmed a right lower lobe consolidation. The patient was promptly started on an empiric antimicrobial regimen of intravenous piperacillin-tazobactam and vancomycin for suspected hospital-acquired pneumonia.

Today, the patient feels much better, is breathing comfortably on ambient air, and his temperature has normalized to 37.1°C (98.8°F). Leukocyte counts have trended down from a peak of 16,500/mm³ to 8,500/mm³. The microbiology laboratory reports that respiratory cultures from the initial febrile episode have finalized, revealing a heavy growth of Haemophilus influenzae. The isolate demonstrates susceptibility to ceftriaxone, levofloxacin, and amoxicillin-clavulanate.

Which of the following represent the most appropriate management decisions at this time? (Select exactly 2 answers)

  1. Discontinue the intravenous vancomycin therapyAnswer
  2. Narrow the primary antimicrobial coverage to intravenous ceftriaxoneAnswer
  3. C
    Continue piperacillin-tazobactam for the remainder of the treatment course
  4. D
    Initiate oral prednisone therapy to manage an acute underlying pulmonary exacerbation
  5. E
    Schedule a lower extremity venous duplex ultrasound to rule out a deep vein thrombosis as the fever source

Answer

The most appropriate steps are to discontinue the intravenous vancomycin therapy and narrow the primary antimicrobial coverage to intravenous ceftriaxone.
The correct management involves de-escalating the patient's antibiotic regimen. Hospital-acquired pneumonia often requires initial broad-spectrum coverage, including agents active against MRSA (vancomycin) and Pseudomonas aeruginosa (piperacillin-tazobactam). However, once culture data confirms the specific causative organism (in this case, Haemophilus influenzae) and its susceptibility profile, standard of care mandates narrowing the antimicrobial spectrum. Therefore, vancomycin must be discontinued because there is no evidence of MRSA. Furthermore, piperacillin-tazobactam should be narrowed to ceftriaxone, which perfectly targets the isolated, susceptible pathogen while sparing broader microbiomes.

Step-by-Step Solution

1
Evaluate the patient's current clinical trajectory.
The patient is clinically stable, afebrile, and his leukocytosis has resolved on the current empiric antibiotic regimen.
Clinical stability indicates that the initial diagnosis of pneumonia was correct and the empiric antibiotics were effective.
2
Review finalized microbiology data.
Sputum cultures exclusively grew Haemophilus influenzae susceptible to ceftriaxone, levofloxacin, and amoxicillin-clavulanate.
Culture data guides the transition from empiric to targeted definitive therapy.
3
Apply antimicrobial stewardship principles.
Vancomycin (MRSA coverage) and piperacillin-tazobactam (broad-spectrum/Pseudomonal coverage) are discontinued in favor of ceftriaxone.
De-escalating to a narrower-spectrum antibiotic reduces the risk of antibiotic resistance, adverse drug effects, and Clostridioides difficile infection.

Key Concept

In the postoperative setting, patients treated with broad-spectrum empiric antibiotics for suspected infections should have their antimicrobial regimen de-escalated to targeted, narrow-spectrum agents once specific pathogens and susceptibilities are identified.
Estimated Time:1m 30s
Rate this question

Topics

Preoperative and Postoperative Care

More questions from this topic