A 61-year-old man is evaluated on postoperative day 2 following an open repair of a large … — USMLE Step 2 CK

A 61-year-old man is evaluated on postoperative day 2 following an open repair of a large ventral hernia. He reports mild shortness of breath and states that it is extremely painful to take a deep breath or cough. His temperature is $38.3^\circ\text{C}$ ( $101.0^\circ\text{F}$ ), blood pressure is $135/85\text{ mmHg}$ , pulse is $92/\text{min}$ , and respiratory rate is $20/\text{min}$ . Pulse oximetry shows an oxygen saturation of $93\%$ on room air. On physical examination, the abdominal dressing is clean, dry, and intact with no surrounding erythema. Pulmonary auscultation reveals decreased breath sounds at the lung bases bilaterally, but no crackles, rhonchi, or wheezing are heard. Cardiac examination shows a regular rate and rhythm without murmurs. The calves are soft and non-tender. Laboratory studies show a leukocyte count of $12,200/\text{mm}^3$ . Which of the following are the most appropriate management steps for this patient's current condition? (Select 2)

Encourage frequent use of incentive spirometryAnswer
Optimize systemic analgesia to reduce abdominal splintingAnswer
C
Obtain comprehensive blood, urine, and wound cultures
D
Initiate empiric broad-spectrum intravenous antibiotics
E
Administer an intravenous loop diuretic

Answer

The most appropriate management steps are to encourage frequent use of incentive spirometry and to optimize systemic analgesia to reduce abdominal splinting.

This patient's presentation of low-grade fever, mild hypoxemia, and decreased basilar breath sounds on postoperative day 2 following open abdominal surgery is a classic presentation for atelectasis. Following abdominal or thoracic surgery, patients frequently experience significant pain that leads to shallow breathing and decreased coughing (a phenomenon known as splinting). This lack of deep lung expansion promotes alveolar collapse. Furthermore, mild leukocytosis (

12,200/\text{mm}^3

) is a normal physiologic stress response to surgery and does not independently indicate infection. The most effective management for postoperative atelectasis relies on aggressive pulmonary hygiene. Encouraging incentive spirometry helps to mechanically re-expand collapsed alveoli. Simultaneously, optimizing systemic analgesia is critical because it relieves the pain that is causing the patient to splint, thereby allowing for deep, effective breaths and coughing.

Step-by-Step Solution

Analyze the patient's timeline and vital signs.

The patient presents with low-grade fever, mild hypoxemia, and mild tachycardia on postoperative day 2 following a major open abdominal surgery.

Establishing the postoperative timeline (the '5 Ws') is crucial for narrowing the differential diagnosis of postoperative fever.

Correlate the timeline with physical examination and laboratory findings.

The exam reveals decreased basilar breath sounds without crackles, and the patient reports severe pain preventing deep breaths. The mild leukocytosis is a normal postoperative stress response.

These findings point away from infectious causes (like pneumonia, UTI, or surgical site infection) or fluid overload, and strongly suggest atelectasis due to abdominal splinting.

Determine the optimal clinical interventions based on the diagnosis.

The patient requires mechanical re-expansion of the alveoli and elimination of the barrier to deep breathing.

Incentive spirometry addresses the alveolar collapse directly, while optimizing pain control prevents the shallow breathing that caused the condition in the first place.

Key Concept

Fever on postoperative days 1-2 is most commonly caused by atelectasis, which is driven by shallow breathing (splinting) secondary to surgical pain. The primary management is preventative and supportive, utilizing aggressive pulmonary hygiene (e.g., incentive spirometry) alongside optimized analgesia.

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