What is the definition of an Ischaemic stroke?
A sudden onset focal or global neurological deficit of vascular aetiology which lasts more than >24 hours or leads to death(or with evidence of infarction on imaging).
What are the main causes of an Ischaemic Stroke?
What are the risk factors for an ischaemic stroke?
Weaker risk factors: hypercholesterolaemia, obesity, poor diet, oestrogen-containing therapy, and migraine
What are the clinical features of a stroke?
Stroke symptoms are usually asymmetrical
What is the first line investigation for someone presenting with a stroke?
Non-contrast Head CT Scan with 1 hour of attending hospital
(very sensitive to haemmorhagic, but will appear normal in the first few hours of an ischaemic stroke)
What is the most sensitive test for confirming an ischamic stroke?
Diffusion Weighted MRI
Only done if the diagnosis is unclear
What are some post-acute ischaemic stroke investigations?
What are some post-acute Haemmorhagic stroke investigations?
Serum toxicology screen
(sympathomimetic drugs (e.g. cocaine) are a strong risk factor)
What is the acute management of an ischaemic stroke?
Once a head CT has ruled out haemorrhage:
Thrombolysis with Alteplase (tissue plasminogen activator) if patients present within 4.5 hrs of symptom onset. (Assuming there are no contraindications)
Mechanical Thrombectomy in patients with an anterior circulation stroke (+ selected posterior circulation strokes) providing they have good baseline function.
300mg Aspirin for 2 weeks started immediately if thrombolysis not offered. Or 24hrs after thrombolysis.
Give some contraindications for thrombolysis
HALTSS
What are the key steps for secondary stroke prevention?
What are some stroke differential diagnoses?
What is a Total Anterior Circulation Infarct (TACI) defined by?
A TACI involves the anterior AND middle cerebral arteries on the affected side.
What is a Partial Anterior Circulation Infarct (PACI) defined by?
A PACI involves the anterior OR middle cerebral artery on the affected side.
What is a Posterior Circulation Infarct (POCI) defined by?
A POCI involves the vertebrobasilar arteries and associated branches (supplying the cerebellum, brainstem, and occipital lobe).
What is a Lacunar Infarct defined by?
involves perforating arteries around the internal capsule, thalamus and basal ganglia
presents with 1 of the following:
1. unilateral weakness (and/or sensory deficit) of face and arm, arm and leg or all three.
2. pure sensory stroke.
3. ataxic hemiparesis
What are the 4 Posterior Stroke Syndromes?
Define Locked in Syndrome
It’s Quadriparesis with preserved consciousness and ocular movements.
Its caused by Basillar Artery Occlusion
What is the clinical presentation of Lateral Pontine Syndrome?
Symptoms are similar to Wallenberg’s (see above), but:
Ipsilateral: facial paralysis and deafness
What is the clinical presentation of Weber’s Syndrome?
It causes an ipsilateral oculomotor nerve palsy and contralateral hemiparesis.
What is the definition of a Haemorrhagic Stroke?
A cerebrovascular event that occurs when the wall of a blood vessel in the brain weakens and ruptures.
This rupture causes bleeding in the brain, leading to haematoma formation and consequently neuronal injury.
What is the clinical presentation of a Sub-arachnoid Haemmorhage?
Meningitis Mimics:
What are the risk factors for a haemorrhagic stroke?
Weaker RFs include: NSAIDs, Heavy alcohol use and
Thrombocytopenia
What is the epidemiology of haemorrhagic strokes?
They make up 15% of all strokes (the other 85% being ischaemic)
Three quarters are intra-cerebral haemmorhages and the rest are sub-arachnoid.