Traumatic shock management

Shock Pathophysiology - The Pressure Plunge

• Core Insult: Inadequate end-organ perfusion & oxygen delivery, leading to cellular dysfunction.
• Hemodynamic Hallmark: ↓ Mean Arterial Pressure (MAP). Governed by the formula: $MAP = CO \times SVR$.
  • $CO$ (Cardiac Output) = $HR \times SV$.
  • $SV$ (Stroke Volume) depends on preload, afterload, and contractility.
• In trauma, the primary trigger is often ↓ preload from hemorrhage.

⭐ The Lethal Triad of Trauma: A vicious cycle where Hypothermia impairs the coagulation cascade, Acidosis from lactate reduces cardiac function, and Coagulopathy worsens hemorrhage, feeding the cycle.

Initial Assessment - Trauma's First Dance (ABCDE)

📌 Airway, Breathing, Circulation, Disability, Exposure

• Airway: Assume C-spine injury. Use jaw-thrust. Secure airway if compromised.
• Breathing: High-flow O₂, assess for tension pneumothorax, flail chest.
• Circulation: Control hemorrhage first! 2 large-bore IVs. Start crystalloids/blood.
• Disability: Glasgow Coma Scale (GCS), pupillary exam.
• Exposure: Fully undress patient, but prevent hypothermia (warm blankets).

⭐ GCS < 8? Intubate! A critical decision point in airway management.

Hemorrhagic Shock - The Big Bleed

• Pathophysiology: ↓ Intravascular volume → ↓ Preload → ↓ Cardiac Output → Inadequate tissue perfusion.
• Priorities: C-ABC (Catastrophic hemorrhage, Airway, Breathing, Circulation). Control external bleeding first!
• Management:
  • Stop the bleed: Direct pressure, tourniquets, packing, surgical intervention.
  • Permissive Hypotension: Target SBP 80-90 mmHg (except in TBI) until bleeding is controlled.
  • Resuscitation: Avoid aggressive crystalloid infusion. Initiate Massive Transfusion Protocol (MTP).
    • 1:1:1 Ratio: 1 unit pRBCs : 1 unit FFP : 1 unit Platelets.
    • Tranexamic Acid (TXA): Administer within 3 hours of injury.

⭐ The Lethal Triad: A vicious cycle in trauma patients consisting of Hypothermia, Acidosis, and Coagulopathy. Each component worsens the others, leading to ↑ mortality.

Damage Control Resuscitation - Plugging the Leaks

• Core Goal: Break the lethal triad of trauma (acidosis, hypothermia, coagulopathy) in exsanguinating patients.
• Strategy:
  • Permissive Hypotension: Keep SBP ~90 mmHg (if no head injury) to prevent clot disruption.
  • Hemostatic Resuscitation: Early blood product administration over crystalloids.
  • Damage Control Surgery (DCS): Rapidly control bleeding & contamination, then close temporarily. Definitive repair after ICU stabilization.

⭐ Balanced Transfusion: Use a 1:1:1 ratio of PRBCs:FFP:Platelets to combat coagulopathy.

High‑Yield Points - ⚡ Biggest Takeaways

• The ABCDEs are the universal first step; uncontrolled hemorrhage is the leading cause of preventable trauma death.
• Immediately secure two large-bore IVs for resuscitation, starting with crystalloids, then transitioning to blood products.
• For massive transfusion, use a balanced 1:1:1 ratio of PRBCs, FFP, and platelets.
• Employ permissive hypotension (systolic BP 80-90 mmHg) in penetrating trauma until bleeding is surgically controlled.
• The FAST exam is a critical rapid screen for internal bleeding.
• Definitive hemorrhage control is the ultimate treatment.