Post-operative day 2 after laparotomy: hypovolaemia, sepsis, or both?
Mr R, 58 years, is on postoperative day 2 after emergency laparotomy for a perforated duodenal ulcer. He weighs 68 kg. Overnight chart: pulse 122/min, BP 92/58 mmHg, respiratory rate 26/min, temperature 38.6 °C, SpO2 94% on 4 L/min nasal prongs. The urinary catheter has drained 15 mL/hour for the last three hours. The Ryle's tube is draining 150 mL of bile-stained fluid per shift and the abdominal drain has 200 mL of turbid, bile-tinged fluid in 4 hours. The abdomen is distended and tender with absent bowel sounds. CVP is 4 cm H2O. Investigations: WBC 19,400/µL, lactate 3.8 mmol/L, serum creatinine 1.6 mg/dL (pre-operative 0.9), sodium 134 mmol/L, potassium 3.2 mmol/L. Two peripheral lines are in situ; Ringer's lactate is running at 80 mL/hour. The surgical resident is in theatre for another five hours and there is no ICU bed for at least six hours. The nurse is asked by an intern to 'just speed up the fluids and give paracetamol for the fever'.
1. Which findings point to hypovolaemia, which to sepsis, and how should the two be weighed in this patient? Show your working.
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Both processes are running at once. Treat this as hypovolaemia plus probable intra-abdominal sepsis until proven otherwise.
- Volume loss is real and measurable: 200 mL of bile-stained drain fluid in 4 hours, 150 mL/shift nasogastric loss, insensible losses and third-space sequestration after laparotomy. The supporting numbers are CVP 4 cm H2O, urine 15 mL/hour (well below 0.5 mL/kg/hour), creatinine rising 0.9 to 1.6 mg/dL, potassium 3.2 mmol/L from gastrointestinal loss, and pulse 122/min.
- Sepsis is suggested by temperature 38.6 °C, WBC 19,400/µL, respiratory rate 26/min, and a distended tender abdomen with absent bowel sounds two days after repair of a perforated viscus, which raises the possibility of a leak or collection. Lactate 3.8 mmol/L completes the picture.
Lactate above 2 mmol/L means tissue hypoperfusion whatever the cause; in this setting it is not explained by dehydration alone. The two processes are synergistic: hypovolaemia worsens gut perfusion and bacterial translocation, while sepsis causes vasodilatation and capillary leak that worsen the effective circulating volume. The practical consequence is that fluid alone will not rescue him: source control and antibiotics are equally urgent. Do not spend the next hour deciding on a label.
2. List, in priority order, the actions you would take in the next 30 minutes. State what you would refuse or defer and why.
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Priority order:
- Airway and breathing: sit up as tolerated, oxygen to keep SpO2 at or above 94%, continuous monitoring.
- Circulation: keep both lines, start a 500 mL crystalloid bolus over 15 minutes (about 7 mL/kg), then reassess pulse, BP, CVP, capillary refill and urine output before repeating. Fluid without reassessment is how patients are overloaded.
- Hourly urine measurement, strict intake-output chart, daily weight where possible.
- Blood cultures from two sites and repeat lactate, ABG, electrolytes, creatinine, coagulation and crossmatch before antibiotics if this causes no delay.
- Telephone the on-call surgical consultant now and the intensivist, even without an ICU bed; ask for a written plan (fluid targets, antibiotic prescription, criteria for calling back).
- Antibiotics within one hour as prescribed; keep nil by mouth; nasogastric tube on free drainage; analgesia by the prescribed route, not intramuscular in a hypoperfused patient.
Refuse or defer: giving paracetamol as the response to the fever (it masks the trend and does not treat the cause), accepting 'speed up the fluids' as a plan without a target and reassessment, and any potassium bolus through a peripheral line.
3. How would you escalate this, and what exactly would you hand over?
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Escalate in parallel, not in sequence: the surgical registrar on call and the consultant, the intensivist or critical-care outreach nurse, and the nursing supervisor if no bed is available. Use SBAR so the seriousness is audible in the first sentence.
- Situation: 'I am calling about Mr R, 68 kg, day 2 after laparotomy for a perforated duodenal ulcer; he is tachycardic at 122, hypotensive at 92/58, urine 15 mL/hour, lactate 3.8, creatinine doubled.'
- Background: perforated duodenal ulcer repaired 48 hours ago, drain bile-stained, potassium 3.2, no ICU bed for six hours.
- Assessment: I think he is hypovolaemic and has an intra-abdominal source of sepsis; he is under-resuscitated at 80 mL/hour.
- Recommendation: 'I need you to review him within the next 30 minutes, give me a fluid target and an antibiotic prescription, and tell me which parameters should trigger a call back.'
Write the time, the name of the person contacted and the advice received in the notes. If advice is refused, escalate to the next level and document that too - the record is the safety net.