2) MOI Flashcards
MOI:
Energy:
Inertia:
= mech of injury how the injury happened
= Ability to do work
= law of Inertia (Newton’s 1st law) helps explain how objects in motion behave
Newton’ s 1st law:
Newtons 2nd Law:
= (inertia): body in motion will stay in motion unless acted upon an outside force “Body at rest will remain at rest unless acted upon upside force”
= “law forces at work stay in work during collision”
Kinetic energy:
Kinetic Energy form:
=energy of a object in motion (by objects mass & its velocity
= (Mass x Velocity ^2)/ 2 ½ x mv^2
Force:
Force formula:
= force related to a objects mass(weight) and/or achange in velocity
= mass x Acceleration
Biomechanic of trauma:
Occur w/ 2 forms:
= manner in which energy exchange damages human tissue
= blunt or penetrating
Faster and/or mass relation to energy:
Cavitation’s relation to speed:
Energy exchange Study of:
= more deceleration > more transfer of energy
= Faster object greater cavitation
= “kinetics of energy compact”
Forces of Blunt trauma:
Compression, Shear, Stretch
Compression blunt trauma:
Hematoma:
Contusion:
Ecchymosis:
= impact abruptly stops body part while inertia continues (hit by bat)
= artery bleed under area
= bruise cap bleed
= discoloration ID contusion
Stretch blunt trauma:
Sciwora:
= Tendons & Fibers that (tendons stronger) hold organs & other structures together are pulled & injured or torn
= spinal cord injury with out r a (kids in wreck overstretching neck)
Shear blunt trauma:
Axons shearing:
= injury occurs along edges of impacting force or at organ attachments (sudden acceleration) (liver ligament teres cuts liver) (arteriosus ligament shears middle of aorta (ductus oreriosis)
= concussion diffuse axonal injury DAI (changed pep b/c DAI)
MVC) Types of impacts:
Most common impact:
Most deadly impact:
commonly most benign impact:
= Frontal, Lateral, Oblique, Roll over, Rear
= Frontal
= Lateral (b/c less crumble zone & Seat belts offer lil protection)
= Rear
MVC) Phase 1:
Phase 2:
Phase 3:
Phase 4:
Phase 5:
= Vehicle collision (P1) deceleration
= Body collision (P2) decel/ of occupant
= Organ collision (P3) decel of internal
= 2ndary collision (P4) objects in car
= (P5) car rear end, trees,
Seat belts:
Maternal relation w/ seat belts:
Cullen’s sign:
Most common organ injuries:
SRS:
= vehicle restraints, reduced # of collision related deaths
= US #1 maternal death, hips/pelvis not ABDMN
= internal bleed abdominally
= Spleen adults Liver kids
= supplemental Restraint Systems (SRS) 1st used for front impacts, airbag inflation to cushion energy
Impact notes:
> 12inch intrusion could be critical injuries & Hybrids can electrocute
Frontal car impact:
(FCI) Restrained pathway:
(FCI) Unrestrained pathway:
= most common, Spider windshield, Pneumo b/c paper bag syndrome
= fold over, chest/ABDMN, <injuries
= Up & Over, down & under, ejection (most injuries)
Rear Car impact:
(RCI) common injuries:
= read-end, commonly most benign
= Whip lash, common C-Spine injuries
Lateral Car Impact:
more deadly impact b/c:
(LCI) body pathway & injurie:
= hit from side aka T-bone(most dealy b/c less crumble zone)
= Seat belts offer lil protection
= Coupe-Countre-Coupe injury > neck/head toward impact & body w/ impact
Oblique Car Impact:
= occurs when lateral impact is off center aka “spin/rotating”
Roll Over Car Impact:
(ROCI) injuries:
= car is flipping (high critical “drying machine”)
= Multiple impacts from hitting each part of car w/ each 1/4 rotation
Blunt T. to head & neck mortality% & w/ MVC:
= 85% mortality (Focus head neck chest abdomen)
(Blood vol/ loss) Pelvis:
Femur:
Humorous:
= 2-3Liters
= 1.5Liters per femur
= 750ml per humorous
Motorcycles often serious trauma b/c:
Frontal Moto/ pathway & Injuries:
Angular Moto/ pathway & Injuries:
Sliding Moto/ pathway & Injuries:
Ejection Moto/ pathway & Injuries:
= rider tends to absorb much of crash injuries (lots of heads injuries
= most common front dips propelling rider & handlebars catch lower
= “side swipe or lateral” impact w/ guard rails Mostly ortho-injuries
= < chances of ejections) more rashes & “most safe”
= very common, usually more serious injuries Initial Biker then Ground