BCN Ch 22 Flashcards
How long does it take to become unconscious with no blood to the brain?
20 seconds unconscious
4-5 min irreversible damage
How much blood does white matter need compared to grey?
25-white mL/100
75 grey
How much total CBF goes through the brain?
750 mL/min
How often does the blood turn over in the brain?
5-7x/min
What’s the avg CBF?
50 mL/100g/min
How does the brain blood flow differ from the rest of the body?
It has its own regulation system and little ANS effect
How does hypoxia/hypercarbia effect the CBF?
vasodilation and increases CBF
How does hypocarbia effect CBF?
Vasoconstriction and decrease CBF
What does hyperventilation treatment do to intracranial pressure?
decreases
How do veins in the brain differ from in the periphery?
No valves
no muscular tissue
(may provide entry way for pathogens)
What is Kernicterus?
Condition of excessive bilirubin in neonates
What can disruptions in the astrocyte processes result in?
leakage and possible cerebral edema
What are the 2 blood supply routes to the cerebral vasculature?
Anterior/carotid system
Posterior/vetebral-basilar system
What are the 3 sections of the internal carotid artery?
Cervical section - Carotid bifurcation to carotid canal
Petrous section - carotid canal of temporal bone
Cavernous section - cavernous sinus from carotid canal entering dura
Which artery supplies the retina?
Ophthalmic artery - branch of carotid artery