Subarachnoid Haemorrhage Flashcards
define subarachnoid haemorrhage?
Blood in subarachnoid.
usual cause?
trauma to head
RF for SAH?
o Age o HTN o Smoking o FHx o Polycystic kidney disease o Alcohol excess
causes of SAH are split into what two categories?
Traumatic and spontaneous
most common cause for spontaneous SAH?
Burst berry aneurysm
common location for a burst berry aneurysm?
o Junction between anterior communicating artery and
anterior cerebral artery
other causes of a spontaneous SAH?
-4
AV malformation
Mycotic aneurysm
Vertebra artery dissection
Tumour
Aneurysm at PcommA presses on what nerve?
CN 3
3rd nerve palsy from PCA aneurysm, how will eyes look?
down and out, ptosis, mydriasis
in which spaces will blood collect from a subarachnoid haemorrhage?
Basal cisterns and ventricles
blood collecting in ventricles will cause what complication?
Hydrocephalus
how many pts with SAH will get hydrocephalus?
-% wise
20-30%
drug given for hydrocephalus?
conclusive treatment for hydrocephalus?
mannitol
VP shunt
blood leaking in and around brain tissue will cause what?
explain pathophys behind the vasospasm in SAH?
vasospasm
explain pathophys behind the vasospasm in SAH?
blood breaks down > irritates nearby BVs > stops NO being made > vasospasm