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What is Kinetics?
energy expended when objects collide.
A body in motion will remian in motion unless acted on by an outside force. A body at rest will remain at rest unless acted upon by an outside force.
What is the most common injury in a blast?
What is cavitation?
Formation of a partial vacuum and cavity with a semi-fluid medium. Forms the temporary cavity.
What is the " fick Principle"
Tisse perfusion. Lungs-blood - heart- vasculature.
hr x sv
Avg 4900 cc
70 x 70cc
What does co depend on?
rate of contraction
strength of contraction
amoouth of venous return avil to the ventricle ( preload)
the stretch of the ventricle ( frank starling)
What is the most common cause of shock in Trauma?
How do baroreceptors work?
Help maintain bp by 2 neg feedbacks.
Lowering bp in response to increased arteriol pressure
Increasing bp in response to decresed aterial pressure
A venous bleed presents how?
Slow and steady and dark red- arterial is bright red and spirting.
When does bp begin to drop during shock?
What is distributive shock?
prevents appropriate distribution of nutrients and removal of wastes. anaphylactic- septic- hypoglycemia
What is obstructive shock?
interference with the blood flowing through the cardiovascualr system. tension pneumothorax- cardiac tamponade- pulmonary emboli
what are the 3 membranes that protect the brian?
Dura mater- pia mater- arachnoid membrane
What do Battle signs show?
retroauricular acchymosis.- associated with the fracture of auditory canal and lower skull areas.
What do raccoon eyes show?
bilateral periorbital- eccymosis associated with orbital fractures.
What are 2 types of direct brain injurys?
Coup- injury to site of impact
contrecoup- injury on opposite side of impact.
A neurogenic injury with shock secondary to spinal cord damage may present with?
Bradycardia in the presence of hypovolemia
cushing reflex is?
bp up pulse down resp irregular
What is the fibrous tissue that surrounds the interior abd cavity.?
Sign and symp of tension pneumothorax include?
hyperresonance of the injured side of the chest.
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