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Difficulty: EasyPreoperative and Postoperative Care

A 7272-year-old man is evaluated on the surgical floor due to fever and abdominal discomfort. He underwent an open partial colectomy for a large adenomatous polyp four days ago. His indwelling urinary catheter, which was placed during surgery, was removed yesterday morning. The patient now reports new-onset burning with urination and a feeling of incomplete bladder emptying. His temperature is 38.5∘C38.5^\circ\text{C} (101.3∘F101.3^\circ\text{F}), blood pressure is 128/78 mmHg128/78\text{ mmHg}, pulse is 92/min92/\text{min}, and respiratory rate is 16/min16/\text{min}. Physical examination reveals a soft abdomen with mild suprapubic tenderness but no guarding or rebound. The surgical incision is clean, dry, and intact with no surrounding erythema or fluctuance. Lung auscultation is clear bilaterally. Examination of the lower extremities shows no edema or calf tenderness. Which of the following is the most appropriate next step in the management of this patient's fever?

  1. Urinalysis and urine cultureAnswer
  2. B
    Chest radiograph
  3. C
    Lower extremity venous duplex ultrasonography
  4. D
    Bedside opening of the surgical incision
  5. E
    Initiation of empiric intravenous vancomycin and piperacillin-tazobactam

Answer

Urinalysis and urine culture
The correct action is to obtain a urinalysis and urine culture. Postoperative fever is traditionally evaluated using the '5 Ws' mnemonic, which correlates the timing of the fever with the most likely source. Fevers occurring on postoperative days 3 to 5 are most commonly caused by urinary tract infections (UTIs) ('Water'), particularly in patients who had an indwelling urinary catheter. This patient's presentation precisely matches this timeline, and his localized symptoms of dysuria and suprapubic tenderness strongly confirm a suspected UTI. Diagnostic confirmation via urinalysis and culture is the necessary next step before initiating targeted therapy.

Step-by-Step Solution

1
Analyze the patient's postoperative timeline.
The patient is currently on postoperative day 4.
The timing of postoperative fever is highly predictive of its underlying etiology based on the classic '5 Ws'.
2
Evaluate the clinical signs and symptoms.
The patient has dysuria, suprapubic tenderness, and a history of recent indwelling catheter removal. Incision, lungs, and calves are normal.
Localizing symptoms narrow down the source of the fever.
3
Match the timeline and symptoms to the correct postoperative fever etiology.
Fever on postoperative days 3-5 with urinary symptoms indicates a urinary tract infection (Water).
UTIs are the most common cause of fever during this specific postoperative window, especially following catheterization.
4
Determine the next best diagnostic step.
A urinalysis and urine culture should be ordered.
Diagnostic confirmation and sensitivity profiling are required before starting antibiotic therapy in a stable patient.

Key Concept

The timing of postoperative fever correlates heavily with its cause: Wind (atelectasis/pneumonia, days 1-2), Water (UTI, days 3-5), Wound (SSI, days 5-7), and Walking (DVT, days 5-7).
Estimated Time:1m 0s
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Topics

Preoperative and Postoperative Care

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