Multiple Injuries Flashcards
What are the two different mechanisms of injury?
Blunt
Penetrating
What is blunt injury?
injury without interruption of skin integrity
What is penetrating injury?
injury obtained by transmission of energy with interruption of skin integrity
What are four types of force most often applied?
Acceleration
Deceleration
Shearing
Compression
What is acceleration force?
Increase in rate of velocity or speed of a moving object
As velocity increases, so does the amount of damage
What is the equation for finding the psi of an acceleration force?
Body weight x mph = psi of impact
What is compression force?
Being pressed or squeezed together with resulting decrease in volume or size
What is deceleration force?
Decrease in velocity of moving object
What is shearing force?
Also known as degloving
Injury resulting from 2 structures or 2 parts of same structure sliding in opposite direction (causing tissue separation)
Explain the kinematics of penetrating trauma
Transmission of energy from moving object into body tissues as object disrupts integrity of skin and underlying structures
Amount of energy transmitted = amount of damage
Amount of energy is dependent on surface area of point of impact, density of tissue & velocity of projectile at time of impact
What are the three main pathophysiological mechanisms of shock?
Cardiogenic shock
Distributive or vasogenic shock
Hypovolemic shock
What is cardiogenic shock?
Dysfunction in pumping effectiveness of the heart
What is distributive or vasogenic shock?
Abnormal distribution of vascular volume
What is hypovolemic shock?
Reduction in intravascular volume
What are the four stages of shock?
Initial stage
Compensatory stage
Progressive stage
Refractory stage
What occurs during the initial stage of shock?
Cellular level
Decrease in cardiac output and tissue perfusion
Usually no obvious signs and symptoms of deterioration