Neurology 2 Flashcards
What is a sudden onset headache likely to be?
SAH - sudden onset worst ever thunderclap occipital headache and neck stiffness
Migraine - more gradual onset, history of migraines
Venous sinus thrombosis
What is a subdural haematoma?
Bleeding between the arachnoid and dura mater
What are the risk factors of subdural haematoma?
More common in patients with smaller brains e.g. alcoholics, elderly
What causes a subdural haematoma?
Often head injury – can be minor/from a long time ago, sometimes the patient doesn’t remember/notice the injury
What is the site of the bleed in a subdural haematoma?
Bridging veins between the dura and arachnoid mater
How does a subdural haematoma present?
Confusion/drowsiness
Fluctuating consciousness
Signs of raised ICP
Focal neurological signs e.g. hemiparesis.
What is the difference in presentation between an acute and chronic subdural haematoma?
Acute presents like an extradural, chronic presents more gradually with fluctuating consciousness
How do you investigate subdural and extradural haematomas?
1st line = IMMEDIATE CT HEAD – remember blood is white on CT
What is an extradural haematoma?
Bleeding between the dura mater and skull bone
What causes an extradural haematoma?
Traumatic head injury! Usually associated with skull fracture
Where is the site of the bleed in an extradural haematoma?
Middle meningeal artery
How does an extradural haematoma present?
- Head injury
- Brief loss of consciousness/drowsiness
- Lucid period
- Rapid decline in consciousness as it compresses other structures.
- Signs of raised ICP.
How do you treat subdural and extradural haematomas?
Surgery
Craniotomy/decompressive craniectomy/burr hole
IV mannitol to reduce ICP
What can happen if a haematoma keeps growing?
Compress local structures + raises ICP > cerebellar herniation/coning + brainstem death
What are the signs of a growing haematoma?
Severe headache N+V Confusion Seizures Papilloedema Eventually start to get signs of brainstem compression (RAISED ICP)
What is the body’s response to raised ICP?
Cushing’s triad > bradycardia + HTN + deep irregular breathing
What are the common causes of raised ICP?
Haemorrhages
Tumours
Hydrocephalus
What are the less common causes of raised ICP?
Infections e.g abscess
Metabolic stuff – hypercalcaemia, hyponatraemia
What does a subdural haematoma look like on a CT scan?
Crescent shaped haematoma in 1 hemisphere
On CT blood gets darker over time so chronic ones are usually hypodense (dark)
Look for midline shift
What does an extradural haematoma look like on a CT scan?
Biconvex/lemon shaped haematoma adjacent to skull
What is an intracerebral haemorrhage?
Bleeding into the brain tissue
What causes an intracerebral haemorrhage?
HTN
Where is the site of bleeding in an intracerebral haemorrhage?
Can be anywhere - intraventricular, cerebellar, lobar
What is the most common site of an intracerebral bleed?
Basal ganglia