The Hypotensive Trauma Patient Who Is Not Bleeding Where You Think
A 34-year-old man is brought in by EMS after a high-speed motorcycle crash. He is awake, anxious, and diaphoretic. Vitals: BP 78/50, HR 132, RR 30, SpO2 92% on 15 L nonrebreather, GCS 14 (E3 V5 M6). The primary survey shows a seat-belt-pattern bruise across the chest, decreased breath sounds on the right with dullness to percussion, and a distended, firm abdomen. Pelvis is stable to rocking. FAST shows no free fluid in Morison's pouch, splenorenal recess, or pelvis, but there is a large anechoic collection in the left chest. Two large-bore IVs are in place, 1 L of crystalloid has run, and BP is now 84/54. The trauma surgeon is 15 minutes out, and the OR team is being assembled.
1. Where is the major source of hemorrhage, and what procedure should you perform now rather than waiting for the surgeon?
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The major hemorrhage is in the left hemothorax, not the abdomen. The FAST is negative in the abdomen/pelvis, but a large anechoic left pleural collection in a hypotensive blunt trauma patient represents a massive hemothorax. The abdominal distension is likely gastric distension/ileus from bag-valve ventilation, not hemoperitoneum. The correct action is immediate tube thoracostomy (large-bore chest tube, 28–32 Fr) on the left. This evacuates blood, improves ventilation and venous return, and allows autotransfusion if available. Do not delay for the surgeon; a retained massive hemothorax causes shock and later empyema. If initial drainage is >1,500 mL or >200 mL/hr for 2–4 hours, that is an indication for thoracotomy, which you should flag to the surgeon. Prepare for blood products (MTP), keep the patient warm, and anticipate intubation for the impending respiratory failure.
2. The patient's SpO2 remains 92% after chest tube placement and he becomes more tachypneic. What is your next airway decision, and what pitfall must you avoid?
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Proceed to rapid sequence intubation for respiratory failure and shock. The pitfall is induction-agent hypotension: propofol and high-dose etomidate can drop a catecholamine-dependent trauma patient's pressure further. Use ketamine (1–2 mg/kg IV) or a reduced-dose etomidate, with rocuronium 1.2 mg/kg for rapid paralysis. Preoxygenate aggressively, and have push-dose vasopressor (phenylephrine 100 mcg or epinephrine 10 mcg) ready. Anticipate a post-intubation drop from loss of sympathetic tone and positive pressure, and give a fluid/blood bolus concurrently. Also watch for tension pneumothorax if the chest tube is kinked or clotted; reassess tube patency and consider a second tube if the first is not draining. Confirm placement with waveform capnography and reassess breath sounds.