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Question

Difficulty: EasyPreoperative and Postoperative Care

During surgical rounds, an attending physician is reviewing the classic timeline of postoperative complications with the medical team to establish a diagnostic protocol. Arrange the following common causes of postoperative fever in the correct chronological order of their typical onset, starting with the earliest expected complication and ending with the latest.

  1. 1Atelectasis
  2. 2Catheter-associated urinary tract infection
  3. 3Surgical site infection
  4. 4Drug-induced fever

Answer

The correct chronological sequence is Atelectasis (Days 1-2), Catheter-associated urinary tract infection (Days 3-5), Surgical site infection (Days 5-7), and Drug-induced fever (Days >7).
The classic timeline for postoperative fever follows a highly predictable sequence based on the underlying pathogenesis. It begins with atelectasis (days 1-2) due to hypoventilation, followed by urinary tract infections (days 3-5) from catheter colonization, then surgical site infections (days 5-7) as bacteria multiply in the wound, and finally drug-induced fever (>7 days) which requires a longer period for immune sensitization.

Step-by-Step Solution

1
Identify the etiology with the earliest onset.
Atelectasis occurs on postoperative days 1-2.
Immediate postoperative pain and anesthesia effects lead to shallow breathing and alveolar collapse.
2
Identify the etiology that follows early pulmonary complications.
Urinary tract infection occurs on postoperative days 3-5.
Bacterial colonization of indwelling Foley catheters takes a few days to progress into a symptomatic clinical infection.
3
Identify the timing of wound-related complications.
Surgical site infection occurs on postoperative days 5-7.
Pathogens introduced during surgery require a multiday incubation period to multiply and cause an invasive tissue infection.
4
Identify the etiology with the most delayed onset.
Drug-induced fever occurs after postoperative day 7.
Hypersensitivity reactions require a sensitization period to the new medication, which typically takes a week or longer to develop.

Key Concept

Chronological timeline of postoperative fever etiologies (The '5 Ws' mnemonic)
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Topics

Preoperative and Postoperative Care

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