A 32-year-old male presents to the emergency department following a high-speed motor vehicle collision. On primary survey, he is found to be in hemorrhagic shock (BP 80/50 mmHg, HR 130/min, respiratory distress). After securing two large-bore IVs and initiating rapid fluid resuscitation, what is the drug of choice for immediate management of his hypotension if he does not respond to 2 liters of crystalloid within 10 minutes?

## Drug of Choice for Refractory Hemorrhagic Shock **Key Point:** Noradrenaline (norepinephrine) is the first-line vasopressor for hemorrhagic shock that fails to respond to initial fluid resuscitation in trauma patients. ### Mechanism and Rationale Noradrenaline provides: - **α-adrenergic effects** → potent vasoconstriction → restores systemic vascular resistance - **β-adrenergic effects** → maintains cardiac contractility and heart rate - Superior perfusion to vital organs (brain, heart, kidneys) compared to other vasopressors ### ATLS and Trauma Guidelines According to ATLS principles, the management sequence for hemorrhagic shock is: 1. Control external hemorrhage (direct pressure, tourniquets) 2. Establish IV access and initiate crystalloid resuscitation (1:1:1 ratio with blood products in massive transfusion) 3. If hypotension persists despite adequate fluid resuscitation → initiate vasopressor support 4. **Noradrenaline is the preferred agent** in this setting **High-Yield:** Noradrenaline should be administered through a central line (peripheral use risks tissue necrosis), and the goal is to achieve MAP ≥ 65 mmHg while definitive hemorrhage control (surgery) is arranged. ### Dosing - Initial: 0.05–0.1 mcg/kg/min IV infusion - Titrate to target MAP ≥ 65 mmHg - Maximum: 1–2 mcg/kg/min **Clinical Pearl:** In trauma, vasopressors are a temporizing measure — the definitive treatment is surgical hemostasis. Do not delay operative intervention while titrating vasopressors.