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Quantum Physics and the Time-Space Continuum
An in depth and highly detailed analysis of the physical universe and it’s relevance to the pre-hospital emergency medical practicum.
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TRAUMA KINEMATICS
An Introduction to the Physics of Trauma
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Trauma Statistics
Over 150,000 trauma deaths/year
– Over 40, 000 are auto related
Leading cause of death for ages 1-40
One-third are preventable
Cost exceeds $220 billion (2001)
Unnecessary deaths are often caused by injuries missed because of low
index of suspicion
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Kinematics
Physics of Trauma
Understanding kinematics allows prediction of injuries based on
forces and motion involved in an injury event.
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Basic Principles
Conservation of Energy Law
Newton’s First Law of Motion
Newton’s Second Law of Motion
Kinetic Energy
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Newton’s First Law
Body in motion stays in motion unless acted on by outside force
Body at rest stays at rest unless acted on by outside force
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Newton’s Second Law
Force of an object = mass (weight) x acceleration or deceleration
(change in velocity)
Major factor is velocity
“Speed Kills”
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Law of Conservation of
Energy
For every action there is an opposite and equal reaction
Energy cannot be created or destroyed
Energy can only change from one form to another
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Kinetic Energy
Energy of Motion
Kinetic energy = ½ mass of an object X (velocity)2
Injury doubles when weight doubles but quadruples when
velocity doubles
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So…
When a moving body is acted on by an outside force and changes its motion, then kinetic energy must
change to some other form of energy.
If the moving body is a human being and the energy transfer
occurs too rapidly, then trauma results.
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Blunt Force Trauma
• Force without
penetration
• “Unseen injuries”
• Cavitation towards or
away from the injury
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Penetrating Trauma
Piercing or penetration of body with damage to soft tissues and organs
Depth of injury
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Mechanism of Injury Profiles
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Motor Vehicle Collisions
Five major types of motor vehicle collisions:
–Head-on
–Rear-end
–Lateral
–Rotational
–Roll-over
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Motor Vehicle Collisions
In each collision, three impacts occur:
–Vehicle
–Occupants
–Occupant organs
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Head-On Collision
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Head-on Collision
Vehicle stops
Occupants continue forward
Two pathways
–Down and under
–Up and over
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Frontal Collision
Down and under pathway
–Knees impact dash, causing knee dislocation/patella fracture
–Force fractures femur, hip, posterior rim of acetabulum (hip socket)
–Pelvic injuries kill!
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Frontal Collision
Down and under pathway
–Upper body hits steering wheel
• Broken ribs
• Flail chest
• Pulmonary/myocardial contusion
• Ruptured liver/spleen
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Frontal Collision
Down and under pathway
–Paper bag pneumothorax
–Aortic tear from deceleration
–Head thrown forward
• C-spine injury
• Tracheal injury
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Frontal Collision
Up and over pathway
–Chest/abdomen hit steering wheel
• Rib fractures/flail chest
• Cardiac/pulmonary contusions/aortic tears
• Abdominal organ rupture
• Diaphragm rupture
• Liver/mesenteric lacerations
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Frontal Collision
Up and over pathway
–Head impacts windshield
• Scalp lacerations
• Skull fractures
• Cerebral contusions/hemorrhages
–C-spine fracture
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Rear-end Collision
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Rear-end Collision
Car (and everything touching it) moves forward
Body moves, head does not, causing whiplash
Vehicle may strike other object causing frontal impact
Worst patients in vehicles with two impacts
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Lateral Collision
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Lateral Collision
Car appears to move from under patient
Patient moves toward point of impact
Increased potential for “shearing” injuries
Increased cervical spine injury
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Lateral Collision
Chest hits door
–Lateral rib fractures
–Lateral flail chest
–Pulmonary contusion
–Abdominal solid organ rupture
Suspect upper extremity fractures and dislocations
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Lateral Collision
Hip hits door
–Head of femur driven through acetabulum
–Pelvic fractures
C-spine injury
Head injury
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Rotational Collision
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Rotational Collision
Off-center impact
Car rotates around impact point
Patients thrown toward impact point
Injuries combination of head-on, lateral
Point of greatest damage = point of greatest deceleration =
worst patients
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Rollover
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Roll-Over
Multiple impacts each time vehicle rolls
Injuries unpredictable
Assume presence of severe injury
Justification for Transport to Level I or II Trauma Center
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Restrained vs Unrestrained Patients
Ejection causes 27% of motor vehicle collision deaths
1 in 13 suffers a spinal injury
Probability of death increases six-fold
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Restrained with Improper Positioning
Seatbelts Above Iliac Crest
–Compression injuries to abdominal organs
–T12 - L2 compression fractures
Seatbelts Too Low
–Hip dislocations
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Restrained with Improper Positioning
Seatbelts Alone
–Head, C-Spine, Maxillofacial injuries
Shoulder Straps Alone
–Neck injuries
–Decapitation
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Motorcycle Collisions • Rider impacts motorcycle parts
• Rider ejected over motorcycle or
trapped between motorcycle and
vehicle
• No protection from effects of
deceleration
• Limited protection from
gear
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Pedestrian vs. Vehicle
Child
–Faces oncoming vehicle
–Waddell’s Triad
• Bumper Femur fracture
• Hood Chest injuries
• Ground Head injuries
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Pedestrian vs. Vehicle
Adult
–Turns from oncoming vehicle
–O’Donohue’s Triad
• Bumper Tib-fib fracture Knee injuries
• Hood Femur/pelvic
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Falls
Critical Factor
– Height • Increased height + Increased injury
– Surface • Type of impact surface increases injury
– Objects struck during fall
– Body part of first impact • Feet
• Head Buttocks
• Parallel
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Falls
Assess body part that impacts first, usually sustains the bulk of injury
Think about the path of energy through body and what other organs/systems could be impacted (index of suspicion)
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Falls onto Head/Spine
Injuries may not be obvious
C-spine precautions!
Watch for delayed head injury S/S
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Falls onto Hands
Bilateral colles fractures
Potential for radial/ulna fractures and dislocations
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Fall onto Buttocks
Pelvic fracture
Coccygeal (tail bone) fracture
Lumbar compression fracture
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Fall onto Feet*
Don Juan Syndrome
– Bilateral heel fractures
– Compression fractures of vertebrae
– Bilateral Colles’ fractures
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Index of Suspicion
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Stab Wounds
Damage confined to wound track
–Four-inch object can produce nine-inch track
Gender of attacker
–Males stab up; Females stab down
Evaluate for multiple wounds
–Check back, flanks, buttocks
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Stab Wounds
Chest/abdomen overlap
–Chest below 4th ICS = Abdomen until proven otherwise
–Abdomen above iliac crests = Chest until proven otherwise
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Stabbings
Always maintain high degree of suspicion with stab wounds
Remember: small stab wounds do NOT mean small damage
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Gunshot Wounds
Damage CANNOT be determined by location of entrance/exit wounds
–Missiles tumble
–Secondary missiles from bone impacts
–Remote damage from
• Blast effect
• Cavitation
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Gunshot Wounds
Severity cannot be evaluated in the field or Emergency Department
Severity can only be evaluated in OR
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Significant ALS MOI
Multi-system trauma
Fractures in more than one location
MVA – death in same vehicle, high speed or significant vehicle damage
Falls > 2 X body height
Thrown > 10 – 15 feet
Penetrating trauma to the “box”
Age co-factors: < 6 or > 60
“Lucky Victim”
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Conclusion
Think about mechanisms of injury
Always maintain an increased index of suspicion
Doing YOUR job as an EMT will lead to:
–Fewer missed injuries
– Increased patient survival