Postoperative Day 2 After Open Colectomy: Atelectasis or Sepsis?
A 62-year-old man is on postoperative day 2 after an open sigmoid colectomy. He has an epidural for pain and an indwelling urinary catheter. Over the past 6 hours: temperature 38.7 °C, heart rate 122/min, blood pressure 96/58 mmHg, respiratory rate 26/min, and SpO2 92% on 2 L nasal cannula, down from 97% on room air yesterday. Urine output has been 15–20 mL/hour for 3 consecutive hours. He is drowsy but arousable and rates his pain 7/10, worse when he coughs. Breath sounds are decreased at both bases with crackles; the abdominal incision is clean, dry, and intact. WBC 15,400/mm³, lactate 3.4 mmol/L, creatinine 1.0 mg/dL (baseline 0.8). The night nurse documented "probably atelectasis - encourage coughing" and did not call the surgeon.
1. Generate the differential and state which findings support or refute each diagnosis. Then decide whether this patient meets sepsis criteria.
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Hypotheses: (1) atelectasis or pneumonia, (2) intra-abdominal source such as an anastomotic leak or abscess, (3) simple hypovolemia, (4) sepsis with hypoperfusion.
For atelectasis: fever, hypoxemia, decreased breath sounds, splinting and pain-limited cough on day 2. Against: atelectasis alone does not explain a lactate of 3.4, hypotension, and three hours of oliguria.
For an abdominal source: fever and tachycardia after colorectal surgery, plus rising creatinine - also against it, the incision is clean and the abdomen is not described as distended or tender beyond the incision.
For hypovolemia: oliguria, hypotension, tachycardia, and an epidural causing vasodilation. A trial of fluids is appropriate, but hypovolemia does not explain the fever and rising white count.
Sepsis: he meets SIRS criteria (temperature, heart rate, respiratory rate, white count) with a likely source plus hypoperfusion (lactate 3.4, oliguria, hypotension). qSOFA is at least 2 (respiratory rate ≥22, systolic ≤100, altered mentation), which flags high risk. The correct interpretation is possible sepsis with an undetermined source, and that is an escalation, not a watch-and-wait.
2. List your actions in the first 60 minutes, in priority order, with the rationale for the sequence.
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- Stay with the patient and call for help. Increase oxygen to keep SpO2 ≥ 94%, position him upright, and reassess the ABCs. Do not leave to chart.
- Repeat a full set of vital signs, including a manual blood pressure and a repeat temperature; confirm the reading before acting on it.
- Ensure a patent large-bore IV; start the ordered crystalloid bolus (sepsis bundles use roughly 30 mL/kg, confirmed against orders) and reassess blood pressure and urine output after each bolus rather than infusing blindly.
- Draw blood cultures before antibiotics, two sets from separate sites, along with a repeat lactate, urinalysis and culture, and a complete blood count with differential.
- Notify the surgeon now using SBAR, and ask specifically about imaging and about antibiotic orders; antibiotics should not be delayed beyond the first hour.
- Continue monitoring urine output hourly, mental status, and perfusion; document each reassessment.
The order matters because oxygen and cultures are quick, irreversible, and nonharmful, while antibiotics and fluids require orders but must not wait on the cultures. The night nurse's error was not the atelectasis hypothesis - it was failing to escalate abnormal vitals.
3. The patient's blood pressure does not improve after 1 L of crystalloid. What do you do, and how would you frame this in the SBAR handoff?
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Persistent hypotension after adequate fluid challenge converts the picture from possible sepsis to septic shock with a need for vasopressors and a higher level of care. Escalate immediately to the rapid response team and the intensivist; do not continue repeating boluses without reassessing for fluid overload, and do not wait for the next scheduled vital signs.
SBAR framing: Situation - 62-year-old POD 2 open sigmoid colectomy, hypotensive at 96/58, heart rate 122, respiratory rate 26 on 2 L, SpO2 92%, urine output 15–20 mL/hour for 3 hours. Background - epidural, urinary catheter, white count 15,400, lactate 3.4, no abdominal findings. Assessment - meets sepsis criteria with hypoperfusion, source unclear, no response to 1 L crystalloid. Recommendation - "I need you to come now, I need orders for broad-spectrum antibiotics, blood cultures are drawn, and I think he needs a higher level of monitoring. What vasopressor do you want prepared?"
Document the times of the abnormal vitals, the calls, and the interventions. A structured escalation is the difference between a delayed diagnosis and a caught one.