Scene size-up is the first step of trauma assessment and involves evaluating scene safety, initial triage needs, additional resource requirements, and mechanism of injury. Understanding the mechanism, such as in motor vehicle collisions, falls, or penetrating injuries, allows providers to anticipate potential injuries based on the forces involved. Proper scene size-up is critical for effective trauma management and patient care.
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Chapter1 scene size up
1. International Trauma Life Support
for Emergency Care Providers
CHAPTER
eighth edition
International Trauma Life Support for Emergency Care Providers, Eighth Edition
John Campbell • Alabama Chapter, American College of Emergency Physicians
Scene Size-up
1
Key Lecture Points
Explain the relationship of time to patient survival and how this affects our actions at the scene.
Explain the steps of the Scene Size-up and the importance of each step.
Explain the importance of being aware of mechanisms of injury.
Briefly review the concept of transfer of energy.
Stress the concept of the “three collisions.”
Briefly review the highlights of specific situations.
Large vehicle accidents
Frontal deceleration—effect on driver and passengers
Lateral impact
Rear impact
Rollover
Effect of restraints—lap belts, cross-chest lap belts, and air bags
Tractor accidents
Small vehicle accidents
Motorcycles
All-terrain vehicles
Personal watercraft
Snowmobiles
Pedestrian injuries
Falls
Penetrating injuries
Knives
Gunshot wounds
Blast injuries
NOTE: Overview of presentation – continued on next slide.
NOTE: Overview of presentation – continued on next slide.
NOTE: Overview of presentation.
Often patient's life depends on how well you manage details, and not all details are at scene.
You or a member of your team must:
Know how to maintain your ambulance or rescue vehicle so that it is serviced and ready to respond when needed.
Know quickest way to scene of an injury.
Know how to size up a scene in order to recognize dangers and identify mechanisms of injury.
Know which scenes are safe and, if not safe, what to do about them.
Know when you can handle a situation and when to call for help.
Know when to approach patient and when to leave with patient.
Know your equipment and maintain it in working order.
Know most appropriate hospital and fastest way to get there.
Know where to put your hands, which questions to ask, what interventions to perform, when to perform them, and how to perform critical procedures quickly and correctly.
A good scene size-up is essential to maximize patient care.
NOTE: This is presented as an overview for a frame of reference for Scene Size-up. Assessment will be taught in detail in another section.
Emphasize that first step in assessment is always Scene Size-up.
Performing a good Scene Size-up will facilitate a good assessment; a poor Scene Size-up will complicate ensuing assessment and management.
Scene Size-Up includes taking standard precautions to prevent exposure to blood and other potentially infective materials, evaluating scene for dangers, determining total number of patients, determining essential equipment needed for this particular scene, and identifying mechanisms of injuries.
Scene Size-Up actually begins at dispatch, with anticipation of what will be found at scene.
At that time, think about what equipment will be needed and whether other resources may be needed.
Information from dispatch is useful in enabling you to begin to think about a plan, but this information is often exaggerated by caller or even completely wrong. Be prepared to change your plan depending on Scene Size-Up.
Includes information about hazards, such as HAZMAT or other special resources.
NOTE: Covered in more detail in Chapter 22.
Trauma scenes are among most likely to subject rescuer to contamination by blood or other potentially infectious material (OPIM).
Gloves, eye protection or face shields, impervious gowns as needed
Remember to protect your patient from body fluids by changing gloves between patients.
Position response vehicle away from hazards, but close enough to retrieve equipment efficiently and in a direction to leave scene easily.
Consider using vehicle as barrier to hazards (like oncoming traffic).
Windshield survey: Look out windshield for hazards before leaving your response vehicle.
Look for hazards as you approach.
IMAGE: Where are patients at this scene? Where should you look? Where else should you look? It is possible a patient could have been located off-screen to top-left of image.
The following equipment is always needed for trauma patients:
Personal protection equipment.
Long backboard with effective strapping and head motion-restriction device.
Appropriately sized rigid cervical extrication collar.
Oxygen and airway equipment (suction equipment, BVM should be included).
Trauma box (bandage material, blood pressure cuff, stethoscope).
Missed or overlooked injuries may be catastrophic.
5–15% of patients involved in a high-energy event, despite normal vital signs and no apparent anatomic injury on initial assessment, will exhibit severe injuries on later examination.
A strong correlation exists between injury severity and automobile velocity changes, as measured by amount of vehicle damage. Severity of vehicle damage has also been suggested as a nonphysiologic triage tool.
Generalized mechanisms may require a rapid trauma survey whereas focused mechanisms may only require a focused exam.
Motion (mechanical) injuries are by and large responsible for the majority of mortality from trauma in United States and the industrial world.
Generally, blunt trauma is more common in rural settings, and penetrating trauma is more common in urban settings.
Rapid forward deceleration is usually blunt, but may be penetrating.
Most common example of rapid forward deceleration is motor vehicle collision (MVC).
Note: Slide animation
Consider all MVCs to occur as three separate events (Figure 1-2).
Machine collision
Body collision
Organ collision
To explain forces involved, consider Sir Isaac Newton's first law of motion: “A body in motion remains in motion in a straight line unless acted upon by an outside force.”
Motion is created by force (energy exchange), and, therefore, force will stop motion.
If this energy exchange occurs within body, damage of tissues is produced.
ANIMATION: ON CLICK package flies in from left of screen and hits patient's head.
Additional impacts may make it more difficult to predict injuries in these cases.
Quickly but carefully look for clues inside vehicle.
NOTE: Overview of next slides.
In head-on collision, the body is brought to a sudden halt, and energy transfer is capable of producing multiple injuries.
Windshield injuries: of utmost concern is the potential for serious airway and cervical-spine injury.
Steering wheel deformity is a cause for alarm and must heighten your index of suspicion. You must also relay this information to receiving physician.
Potential injury patterns
Deformed steering wheel
Cervical-spine fracture
Dashboard knee imprints
Flail chest
Spider deformity of windscreen
Myocardial contusion
Pneumothorax
Aortic disruption
Spleen or liver laceration
Posterior hip dislocation
Knee dislocation
Sudden forward increase in acceleration from rear-impact mechanisms produces posterior displacement of occupants and possible hyperextension of cervical spine if headrest is not properly adjusted.
If seat back breaks and falls backward into rear seat, there is greater chance of lumbar-spine injury.
Rapid forward deceleration may also occur if car suddenly strikes something in front or if driver applies brakes suddenly.
Note deformity of auto anterior and posterior as well as interior deformity and headrest position.
Potential injury patterns
Cervical-spine injury
The chance for axial-loading injuries of the spine is increased in this form of MVC.
Rotational collision: One part of the vehicle stops and the rest of the vehicle remains in motion, converting forward motion to a spinning motion.
The results are a combination of frontal-impact and lateral-impact mechanisms with the same possibilities of injuries from both mechanisms.
Restrained occupants are more likely to survive a collision because they are protected from much of impact inside the vehicle and are unlikely to be ejected.
If seatbelt is in place and victim is subjected to a frontal deceleration crash, his body tends to fold together like a clasp (or pocket) knife.
Air bags aka passive restraints:
Do not prevent “down and under” movement, so may still impact with legs and suffer leg, pelvis, or abdominal injuries.
Small drivers who bring seat up close to steering wheel may sustain serious injuries as air bag inflates.
Infants in car seats placed in the front seat may be seriously injured by air bag.
Supplemental restraint systems are only effective if occupant is NOT out of position (OOP).
Two basic types of tractors are two-wheel drive and four-wheel drive. In both, center of gravity is high, and thus tractors are easily turned over.
The majority of fatal accidents are due to tractor turning over and crushing driver.
Primary mechanism is crush injury, and severity depends on part of anatomy involved.
Additional mechanisms are chemical burns from gasoline, diesel fuel, hydraulic fluid, or even battery acid.
Thermal burns from hot engine parts or ignited fuel are also common.
Possibility for chemical exposure from insecticides
Liquid nitrogen systems are very cold and can produce frostbite.
Operators of these machines are not encased within them and wear no restraining devices.
They could be considered high-speed pedestrians.
Only forms of protection
Evasive maneuvering
Helmet usage
Protective clothing (such as leather clothes, helmet, boots)
Use of vehicle to absorb kinetic energy (such as bike slide)
NOTE: If any of these small vehicles are common in your area, include additional information from chapter.
IMAGE: “Exploded” leg from being struck by an auto.
Pedestrian almost always suffers severe internal injuries as well as fractures.
This is true even if vehicle is traveling at low speed.
Adult usually has bilateral lower-leg or knee fractures plus whatever secondary injuries occur when body strikes hood of car and then ground.
Children are shorter, so bumper is more likely to hit them in pelvis or torso.
They usually land on their heads in secondary impact.
IMAGE: How high up was patient when he fell?
Primary groups involved in vertical falls are adults and children under age of 5 years.
Children
Most commonly involve boys and occur mostly in summer months in urban high-rise, multiple-occupant dwellings.
Head injuries are common.
Adults:
Generally occupational or due to influence of alcohol or drugs.
“Lover's leap” fall
Attempt to land on feet, impacts initially on feet and then falls backwards, landing on buttocks and outstretched hands
Fractures of feet or legs
Hip and/or pelvic injuries
Axial loading to lumbar and cervical spine
Vertical deceleration forces to organs
Colles fracture of wrists
The greater the height, the greater the potential for injury.
Think about transference of energy from impact—what path did it follow?
Surface density and irregularity also influence severity.
IMAGE: Figure 1-16: Stab wounds at nipple level or below frequently penetrate abdomen.
Upper abdominal stab wound may cause intrathoracic organ injury, and stab wounds below fourth intercostal space may have penetrated abdomen.
Usually stabilize any impaled object in place.
Ensure that stabilization minimizes movement of object that will cause further damage.
Impaled objects in cheek of face and those blocking airway are exceptions to this rule.
IMAGE: High-velocity leg wound. Notice entrance and exit wounds.
Remember that you treat patient and wound, not description of weapon.
Low-velocity
Less than 2,000 feet per second, include essentially all handguns and some rifles.
Injuries are much less destructive than those sustained from high-velocity weapons.
High-velocity
Wounds carry additional factor of hydrostatic pressure.
Factors that contribute to tissue damage include:
Missile size. The larger the bullet, the more resistance and larger permanent tract.
Bullet construction
Missile deformity. Hollow point and soft nose flatten out on impact, resulting in involvement of a larger surface.
Semijacket. The jacket expands and adds to surface area.
Tumbling. Tumbling of missile causes a wider path of destruction.
Yaw. The missile can oscillate vertically and horizontally (wobble) about its axis, resulting in a larger surface area presenting to tissue.
Penetrating wounds consist of 3 parts: entry wound, exit wound, and internal wound.
REFRAIN FROM LABELING WOUNDS AS ENTRANCE AND EXIT in your record. None of us are experts on wound ballistics.
Leave that for surgeon or pathologist.
List wound location and number.
IMAGE: Figure 1-17b.
High velocity is greater than 2,000 feet (610 meters) per second; less than that is low velocity (e.g., handguns, some rifles).
Missile deformity: Projectile flattens out on impact increasing its surface area and causing more damage.
Missile design: Semi-jacketed, soft nose, etc., expand differently.
Tumbling causes a wider path of destruction.
Yaw is the missile wobbling, resulting in a larger area presenting to the tissue.
IMAGE: Figure 1-17a: High-velocity vs. low-velocity injury.
Penetrating wounds consist of 3 parts: entry wound, exit wound, and internal wound.
Low-velocity projectiles inflict damage by tissue contact.
High-velocity projectiles inflict damage by tissue contact and transfer of kinetic energy to surrounding tissues.
Shock waves
Temporary cavity, which is 30 to 40 times bullet's diameter and creates immense tissue pressures
Pulsation of temporary cavity, which creates pressure changes in adjacent tissue
Shotgun wounds, injury determined by kinetic energy at impact, which is influenced by:
Powder charge.
Size of pellets.
Choke of muzzle.
Distance to target.
NOTE: Figure 1-19 depicts blast areas.
Primary air-blast injuries are almost exclusive to air-containing organs.
Secondary injuries may be penetrating or blunt.
Tertiary injuries are much same as when a person is ejected from an automobile.
Now that terrorists are using explosives to disperse chemical, biological, or radiological material, some classify injuries resulting from this as “quaternary injuries.”
Stress need to do an accurate patient assessment.
MOI is a tool but not an absolute. We do not know all forces body may have been exposed to.