Nathan, a 68-year-old man, who presents to the Emergency Department (ED) with abdominal pain, fatigue and confusion. Four days ago, he was discharged from the hospital after laparoscopic surgery for a small bowel obstruction caused by adhesions. His family reports that over the past 24 hours, he has been increasingly confused, and not eating well. PMH: Hypertension, Hyperlipidaemia, ischemic heart disease, Type 2 Diabetes.

Vital Signs: BP: 88/50 mmHg, HR: 110 bpm, Temp: 38.0°C, RR: 28, SpO2: 92%, BGL: 13 mmol/L

Laboratory Results: WBC: 16 x 10⁹/L, CRP: 200 mg/L, Lactate: 3.8 mmol/L,

Based on Nathan's clinical presentation and laboratory findings, which condition most likely explains his current deterioration?

Question

Nathan, a 68-year-old man, who presents to the Emergency Department (ED) with abdominal pain, fatigue and confusion.  Four days ago, he was discharged from the hospital after laparoscopic surgery for a small bowel obstruction caused by adhesions.  His family reports that over the past 24 hours, he has been increasingly confused, and not eating well.  PMH:  Hypertension, Hyperlipidaemia, ischemic heart disease, Type 2 Diabetes.

Vital Signs: BP: 88/50 mmHg, HR: 110 bpm, Temp: 38.0°C,  RR: 28, SpO2: 92%, BGL: 13 mmol/L

Laboratory Results:  WBC: 16 x 10⁹/L, CRP: 200 mg/L, Lactate: 3.8 mmol/L,

Based on Nathan's clinical presentation and laboratory findings, which condition most likely explains his current deterioration?

BlackTom AI · Accepted Answer

Cluster of hypotension, fever, tachycardia, leukocytosis and an elevated lactate indicates sepsis with end-organ hypoperfusion — most consistent with a post‑operative intra‑abdominal infection.

1) Relevant knowledge points and concepts
- Sepsis is life‑threatening organ dysfunction caused by a dysregulated host response to infection. qSOFA criteria (altered mentation, RR ≥22, SBP ≤100) and SIRS criteria can identify patients at risk. Elevated serum lactate (>2 mmol/L) indicates tissue hypoperfusion and is a marker of severe sepsis/septic shock. Post‑operative patients, especially after abdominal surgery, are at increased risk of intra‑abdominal infections (anastomotic leak, perforation, abscess, peritonitis) which commonly present with fever, abdominal pain and systemic inflammatory response.

2) Step‑by‑step reasoning
- Vital signs: BP 88/50 mmHg (hypotension), HR 110 bpm (tachycardia), RR 28 (tachypnea), Temp 38.0°C (fever). These satisfy SIRS and indicate hemodynamic compromise.
- Mental status: increasing confusion = altered mentation (organ dysfunction).
- Labs: WBC 16 x10^9/L and CRP 200 mg/L indicate significant inflammation/infection. Lactate 3.8 mmol/L (>2 mmol/L) indicates tissue hypoperfusion/severity.
- Timing and context: 4 days after laparoscopic small bowel surgery, abdominal pain and progressive systemic signs strongly suggest an intra‑abdominal infectious complication causing sepsis.

3) Calculations / scoring
- qSOFA: RR ≥22 (1), altered mentation (1), SBP ≤100 (1) → qSOFA = 3 (high risk).
- Lactate: 3.8 mmol/L > 2 mmol/L threshold for concern; supports septic shock physiology.

4) Why the correct answer is correct
- The combination of recent abdominal surgery, local abdominal symptoms, systemic inflammatory markers, hypotension, altered mental status and elevated lactate most coherently points to sepsis secondary to a post‑operative intra‑abdominal infection causing circulatory failure and tissue hypoperfusion.

5) Why the other options are unlikely
- Acute cerebrovascular event: typically causes focal neurologic signs without fever, high WBC/CRP or markedly elevated lactate from hypoperfusion.
- Acute coronary syndrome with cardiogenic shock: could cause hypotension/tachycardia, but fever, marked leukocytosis/CRP and recent abdominal surgery point to infection; pulmonary edema or ischemic chest pain would be expected.
- Pulmonary embolism: may cause tachycardia, hypoxia and hypotension, but fever, very high inflammatory markers and abdominal pain after surgery make an intra‑abdominal septic source more likely.

6) Conclusion
All findings best support: Sepsis secondary to a post‑operative intra‑abdominal infection — which matches the provided correct answer.

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