CSF and ICP Flashcards
(14 cards)
Production of CSF starts where
choroid plexus in lateral ventricles
how is CSF absorbed
by arachnoid granulations into dural venous sinuses
what can congenital cerebral aqueduct stenosis cause
hydrocephalus
total CSF volume
RBC?
Protein?
Glucose?
around 125-150mls
no RBC
virtually protein free: <0.5mg/ml
60-70% blood levels of glucose
if CSF glucose is down, what might it suggest
something using this glucose? inflammation? infection?
maybe cell count is up, white cell *
when do you not consider lumbar puncture
if any possibility of a space occupying lesion
what’s the normal opening pressure level
what is considered raised
20cm of water
> 30cm
what is coning
where different bits of brain can be forced into places they shouldn’t be
classically it’s the brain being forced down into the foramen magnum (if pressure above and release pressure down below doing a LP, the brain can go downwards)
a less common example is temporal lobes can go into temporal lobe
what if CSF circulation is blocked if the sutures are not fused?
hydrcephalus with expanded cranium
CSF circulation block with fused sutures
can be fine - arrested hydrocephalus IF SLOW if fast - - raised ICP symptoms - dr0owsiness - coma
what is idiopathic intracranial hypertension
female > male overweight present with symptoms of raised ICP visual disturbance (papilloedema) diplopia (blindness can happen!)
may be associated with risk of cerebral venous sinus thrombosis
treatment for idiopathic intracranial hypertension
weight loss
acetazolamide
repeated LP
shunt
what is syringomyelia
abnormal fluid filled cavity/cyst called a SYRINX develops in the central canal as a result of disrupted CSF drainage from central canal
whats an Chiari malformation and when is it a problem
when the cerebellum pushes down into the foramen magnum.
problem when it causes a syringomyelia to form (where a fluid-filled cavity called a syrinx develops in the spinal cord)
