Hemorrhagic Shock With a Head Injury: Which Blood Pressure Do You Defend?
A 34-year-old motorcyclist with a grade IV splenic laceration is being transferred 60 minutes by helicopter from a critical access hospital to a level I trauma center. In the referring ED he received 4 L of lactated Ringer's. Current: BP 88/54, HR 128, SpO2 96% on a 15 L nonrebreather, GCS 13 (E3 V4 M6), pupils equal and reactive, cool and mottled to the knees. Hemoglobin 6.8 g/dL, lactate 6.2 mmol/L, INR 1.4. Breath sounds are coarse bilaterally with crackles at the bases. The injury occurred 70 minutes ago. The aircraft carries 2 units of packed red cells, no plasma, and tranexamic acid. The referring physician asks you to 'fill him up to a systolic of 120' before you load.
1. List your priority interventions in the first 15 minutes, with doses and routes.
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1. Tranexamic acid now, not later. 1 g IV over 10 minutes, then 1 g over 8 hours. The mortality benefit in CRASH-2 is time-dependent and he is at 70 minutes post-injury; the 10-minute loading dose is a rate the flight crew can watch. This is the single most time-critical drug in the case.
2. Blood, not crystalloid. Start the 2 units of red cells en route. He has already had 4 L of crystalloid - his hemoglobin is 6.8 with hemodilution, his lungs are crackling, and more crystalloid will worsen both the coagulopathy and the pulmonary edema without improving oxygen delivery. Call ahead and ask the trauma center to activate massive transfusion and have whole blood or a balanced 1:1:1 product ratio waiting on the pad. Ask whether your service carries whole blood; if it does, this is a whole-blood patient.
3. Reassess the airway and plan for it. GCS 13 with a full stomach, an anticipated long flight, and a trend that usually goes one direction. If his GCS falls to 8 or his respiratory effort deteriorates, he needs RSI with an airway plan that assumes a difficult laryngoscopy and a full stomach. Pre-oxygenation is compromised by his pulmonary contusion and the crackles, so plan for a careful, pre-briefed approach - not an in-flight emergency intubation at the far end of the stretcher.
4. Stop the bleeding you can. Confirm no pelvic instability (binder if any), splint long bones, keep him warm - hypothermia, acidosis, and coagulopathy are already assembling here.
2. You have two competing blood pressure targets. Which one do you defend, and how do you explain it to the referring physician?
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The competing targets
- Hemorrhagic shock in a young trauma patient conventionally gets permissive hypotension - a systolic of 80-90 - until surgical control, because higher pressures pop the clot.
- Traumatic brain injury gets the opposite: avoid any hypotension. The Brain Trauma Foundation threshold for his age band (15-49) is a systolic of at least 100 mmHg, and many services and centers use 110 as the practical floor as a margin.
How I resolve it
- He has a GCS of 13 with no intoxicant history given and no explanation other than the head injury. Until CT says otherwise, he has a traumatic brain injury, and the brain injury changes the target.
- I defend a systolic of at least 110 mmHg - above the BTF minimum for his age, with a margin for the vibration and altitude of flight - and I get there with blood products, not crystalloid. Permissive hypotension is abandoned here, but the means of raising pressure still matters: a systolic of 110 bought with 2 L of saline will kill him with his lungs, not save him with his brain.
- The one thing I do not defend is the physician's means: 'fill him up to 120' from a crystalloid bag is the wrong tool for a patient with crackles and a hemoglobin of 6.8.
What to say
- 'I agree he needs a higher pressure than a bleeding patient normally would - he's got a head injury. But I am going to get there with blood, not more fluid. He has had four litres already and his lungs are wet. Can you get me plasma or whole blood before we lift, and can you call the trauma center and tell them to have product on the pad?'
- Document the target chosen, the rationale, and the discussion.
3. Halfway through the flight his respiratory rate climbs to 34, SpO2 falls to 89% on the nonrebreather, and his GCS drops to 10. Walk through your management.
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What is likely happening - consider several at once
- Worsening hemorrhagic shock with inadequate oxygen delivery.
- Pulmonary contusion and transfusion-associated or crystalloid-associated pulmonary edema - he arrived with crackles after 4 L.
- Expanding intracranial injury with failing ventilation and a falling GCS.
- A pneumothorax, particularly if he is about to be ventilated with positive pressure.
Immediate actions
- Airway. GCS 10 with a respiratory rate of 34 and desaturation is an airway that is about to fail. Pre-oxygenate as best you can, then perform RSI with in-line stabilization, assuming a difficult airway and a full stomach. Have suction ready and a plan for a failed attempt.
- Ventilate for the brain. Target normocapnia - a PaCO2 around 35-40. Do not hyperventilate reflexively; brief hyperventilation is for impending herniation, not for a saturation number. Keep SpO2 above 94% and avoid a single episode of hypotension during induction - have the push-dose vasopressor drawn up before you push the induction agent.
- Re-examine the chest. Absent breath sounds on one side is a needle decompression, not a discussion.
- Reassess volume status. Recheck the blood in the bag, the line, and the abdomen. If the abdomen is distending, he is still bleeding and the flight plan changes from 'to the trauma center' to 'to the trauma center, faster, with a hemorrhage control team meeting us.'
- Notify early. Call the receiving trauma center with the change and ask them to trigger the massive transfusion protocol and have the operating room ready on arrival.