Kinematics of Trauma & Trauma Patient Assessment

Learning Objectives

  • Explain the relationship between laws of motion, energy, and kinematics of trauma, and how they relate to injury severity and energy exchange.
  • Describe mechanical principles and structural effects of blunt vs. penetrating trauma and their impact on the human body.
  • Outline principles and processes of trauma assessment.

Kinematics

  • Kinematics: Study of motion and forces in trauma incidents; helps predict resultant injuries from specific forces and motions.
  • Injury Mechanism: Both blunt and penetrating trauma involve distinct kinetic forces that dictate injury patterns.

Mechanisms of Injury

  • Blunt Trauma: Caused by forces such as acceleration, deceleration, compression, or shearing without penetrating the skin.
    • Results in internal injuries as organs suffer damage from these forces.
  • Penetrating Trauma: Involves objects entering the body, causing direct damage to tissues and organs.
    • Examples: stab wounds, gunshot injuries.

Trauma Determinants

  • Age Factors:
    • Children and the elderly have different responses to injury due to physiological differences.
  • Gender Disparity:
    • Males show higher rates of injury in various forms, especially road trauma.
  • Cultural Factors:
    • Indigenous populations have elevated injury rates compared to non-Indigenous Australians.
  • Substance Impact:
    • Drugs and alcohol can impair judgment and increase the likelihood of trauma.

Newton’s Laws of Motion

  1. Newton’s 1st Law: An object at rest remains at rest, and an object in motion continues in motion unless acted upon by an external force.
  2. Newton’s 2nd Law: An object’s exerted force equals its mass times acceleration: F=MimesAF = M imes A.
  3. Law of Conservation of Energy: Energy can neither be created nor destroyed, only transformed.
  4. Kinetic Energy Formula: KE = rac{1}{2} m imes v^2 , where m = mass and v = velocity.

Patterns of Injury

  • Major Trauma Statistics:
    • 95% of major trauma cases involve blunt trauma.
    • Common injury patterns include head, chest, and limb injuries, with isolated head injuries showing higher mortality rates.

Trauma Assessment Principles

  • Primary Survey:
    • Focus on immediate life threats: airway, breathing, circulation, disability, exposure.
    • Ensure rapid transport and minimal scene time.
  • Secondary Survey:
    • Comprehensive assessment to identify less obvious but critical injuries.
  • Trauma Triad of Death:
    • Hypothermia, acidosis, coagulopathy, which can be interrelated, leading to increased mortality if not managed promptly.
  • Special Populations:
    • Children: Smaller size, different injury patterns; Elderly: More fragile, higher injury risk from same force; Pregnant Patients: Unique anatomical considerations.

Management of Trauma

  • Immediate Management:
    • Previous patient history informs appropriate interventions.
    • Control blood loss and stabilize the patient for transport.
  • Secondary Conditons:
    • Recognize and manage conditions not immediately critical (e.g. fractures or soft tissue injuries).

Assessment Techniques

  • Rapid scene assessment for safety and injury identification.
  • Use tools like the SAMPLE history to gather pertinent data from patients.
  • Continuously monitor vital signs and reassess during transport to ensure stability.

The First Laws of Trauma

  1. All anomalies stem from trauma; be vigilant.
  2. Always consider ongoing internal bleeding until proven otherwise.
  3. Transfers must be made to a major trauma center when indicated.
  4. Unstable patients can deteriorate quickly.
  5. In children, consider abuse until ruled out.
  6. Comprehensive vital sign checks are critical, regardless of prior assessments.
  7. Patients appear healthiest at the moment of entry into emergency care.
  8. Stay updated on the latest protocols and practices.
  9. Activate critical thinking—question routines and norms.

Summary

  • A systematic approach to trauma assessment and intervention is vital for improving outcomes through early recognition and intervention of potentially life-threatening injuries. This knowledge not only facilitates patient care but also contributes to the overarching understanding of trauma management principles.