Transient responder after blunt abdominal trauma
A 26-year-old man is brought to a level-2 trauma centre 40 minutes after his motorcycle collided with a car. He was not wearing a helmet and has a horizontal contusion across the lower abdomen from the fuel tank. He is alert, GCS 15, airway patent, pulse 122/min, blood pressure 92/58 mmHg, respiratory rate 26/min, SpO2 98% on room air. There is tenderness and guarding in the left upper quadrant and epigastrium with rebound, and the abdomen is distended. FAST shows free fluid in the splenorenal recess and Morison's pouch. Haemoglobin is 9.6 g/dL, lactate 4.2 mmol/L, base deficit −6. After 1 L of warmed Ringer's lactate his blood pressure is 108/70 mmHg and pulse 112/min. CT is available but the scanner is 45 minutes away, the only radiographer is off duty until 08:00, and there is no attendant to sign consent; the patient is oriented and can answer questions. He ate a meal two hours before the crash, and the operating theatre has one anaesthetist on call.
1. Is this patient a transient or sustained responder, and what should happen next - CT or theatre?
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Classification He is a transient responder. He improved with a single litre of crystalloid but the pulse fell only from 122 to 112 and remains elevated, with a continuing base deficit of −6 and lactate of 4.2. A true responder normalises and stays normal; a transient responder re-deteriorates, which means bleeding at a rate of roughly 3 units per hour or more.
Decision Positive FAST with haemodynamic instability after blunt trauma is an indication for immediate laparotomy, not CT. The FAST findings alone do not identify the organ, but they do identify free intraperitoneal blood in an unstable patient, and the trauma surgeon's task is haemorrhage control, not anatomical precision.
Why not CT here
- A 45-minute trip each way with a single anaesthetist and no in-house team converts a transient responder into a decompensating patient in a scanner.
- His orientation does provide consent capacity, so the consent argument for going to theatre actually favours theatre, not CT.
- The distension, rebound and seat-belt sign raise the possibility of a hollow viscus injury, which is a laparotomy diagnosis in this setting regardless.
The safest judgement is: activate the massive transfusion protocol, alert theatre, and operate now.
2. Suppose he stabilises with 2 L and the pulse settles to 90/min. Would non-operative management be defensible, and what would you need?
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It can be defensible only under strict conditions Non-operative management of a solid organ injury (typically splenic) requires:
- Haemodynamic stability that is sustained, not merely transient, with no ongoing transfusion requirement after resuscitation.
- A CT with intravenous contrast defining the injury grade, and no contrast blush or active extravasation - a blush or high-grade injury pushes towards angioembolisation or theatre.
- Immediate access to an operating theatre, an anaesthetist and an ICU bed, with the ability to re-scan and to take the patient back within minutes if they deteriorate.
- Serial abdominal examination by the same team and repeat haemoglobin and lactate.
Pitfalls
- The seat-belt sign, rebound and free fluid raise the probability of a hollow viscus or mesenteric injury. Free fluid without an obvious solid organ source on CT is an indication for laparotomy, not observation.
- Angiography and embolisation are often unavailable at a level-2 centre at night; that must be established before committing.
- A 45-minute CT journey with one radiographer is itself a risk; a patient who needs CT urgently at night may need transfer rather than observation.
The defensible answer is conditional: observe only if stable, low-grade, blush-free, in a unit with immediate rescue capability, and with a low threshold to abandon the plan.
3. Set out the resuscitation strategy for this patient and address the consent problem if he deteriorates and becomes unresponsive before transfer to theatre.
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Damage-control resuscitation
- Minimise crystalloid; the 1 L already given was appropriate for the initial hypotensive period, but further crystalloid dilutes clotting factors and worsens acidosis.
- Blood products in a balanced ratio, roughly 1:1:1 red cells, plasma and platelets, guided by viscoelastic testing if available and by haemoglobin, INR, fibrinogen and calcium.
- Tranexamic acid 1 g over 10 minutes then 1 g over 8 hours, given within 3 hours of injury.
- Permissive hypotension with a target systolic pressure of about 90 mmHg until haemorrhage control, unless there is a traumatic brain injury, in which case target a normal pressure.
- Warm the patient, correct calcium and acidosis, and use a rapid infuser.
- Antibiotics for an open or contaminated wound; tetanus status.
Consent If he becomes unresponsive, the emergency doctrine applies: treat immediately under the doctrine of necessity, documenting why consent could not be obtained. His earlier orientation means an attempt should be made to discuss the plan with him while he is lucid, and any relative should be contacted in parallel but must not delay surgery. The anaesthetist should be told about the full stomach for a rapid-sequence induction, and the single on-call anaesthetist should be backed up before the patient leaves the resuscitation bay.