Geriatrics Flashcards
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?
- Large Vessel Atherosclerosis (50%)
- Intracranial small vessel atherosclerosis (25%)
- Cardio-embolic (AF) (20%)
What are the risk factors for an ischaemic stroke?
- older age
- male sex
- family history of ischaemic stroke
- Previous stroke or TIA
- hypertension
- smoking
- diabetes mellitus
- atrial fibrillation.
Weaker risk factors: hypercholesterolaemia, obesity, poor diet, oestrogen-containing therapy, and migraine
What are the clinical features of a stroke?
- Limb weakness
- Facial weakness
- Dysphasia (speech disturbance)
- Visual field defects
- Sensory loss
- Ataxia and vertigo (posterior circulation infarction)
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?
- Bloods (Glucose, TFTs)
- Carotid ultrasound (critical carotid artery stenosis)
- ECG (for Atrial Fibrillation)
- CT/MR angiography (intracranial and extracranial stenosis)
- Echocardiogram (if a cardio-embolic source is suspected)
- Vasculitis and Thrombophilia screens (in young patients)
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.
- Procedure must begin within 5 hours of known onset
- Must be a proximal intracranial large vessel occlusion
300mg Aspirin for 2 weeks started immediately if thrombolysis not offered. Or 24hrs after thrombolysis.
Give some contraindications for thrombolysis
- Recent head trauma
- GI or intracranial haemorrhage
- Recent surgery
- Clotting disorders
- Acceptable BP, platelet count, and INR
HALTSS
What are the key steps for secondary stroke prevention?
- Hypertension - Anti-hypertensive therapy should be initiated 2 weeks post-stroke.
- Antiplatelet therapy - Clopidogrel (75 mg once daily) or warfarin (in patients with a stroke secondary to AF); started 2 weeks post-stroke.
- Lipid-lowering therapy - High dose Atorvastatin (20-80mg) once nightly.
- Tobacco - smoking cessation
- Sugar - Diabetes Screen
- Surgery - Carotid endarterectomy in patients with ipsilateral carotid artery stenosis
What are some stroke differential diagnoses?
- Hypoglycaemia
- Drugs / Alcohol
- Seizure
- Migraine
- Bell’s Palsy
- Tumour / Space occupying lesion
- Meningitis / Encephalitis
What is a Total Anterior Circulation Infarct (TACI) defined by?
- Contralateral hemiplegia or hemiparesis, AND
- Contralateral homonymous hemianopia, AND
- Higher cerebral dysfunction (e.g. aphasia, neglect)
A TACI involves the anterior AND middle cerebral arteries on the affected side.
What is a Partial Anterior Circulation Infarct (PACI) defined by?
- 2 of the factors for a TACI OR
- Higher cerebral dysfunction alone.
A PACI involves the anterior OR middle cerebral artery on the affected side.
What is a Posterior Circulation Infarct (POCI) defined by?
- Cerebellar dysfunction, OR
- Conjugate eye movement disorder, OR
- Bilateral motor/sensory deficit, OR
- Ipsilateral cranial nerve palsy with contralateral motor/sensory deficit, OR
- Cortical blindness/isolated hemianopia.
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?
- Basillar Artery Occlusion - Causes locked in syndrome, loss of consciousness or sudden death
- Wallenberg’s syndrome (lateral medullary syndrome)
- Lateral pontine syndrome - Caused by occlusion of the anterior inferior cerebellar artery
- Weber’s syndrome/ Medial Midbrain Syndrome - Caused by occlusion of the paramedian branches of the upper basilar and proximal posterior cerebral arteries
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?
- Severe “Thunderclap” Headache
- Vomiting
- May have seizures
- May have loss of consciousness
- May have CN3 and CN6 Nerve palsy
Meningitis Mimics:
- Neck Stiffness and Photophobia
- Kernig’s sign
- Brudinski’s sign
What are the risk factors for a haemorrhagic stroke?
- Age
- Male sex
- Family history of haemorrhagic stroke
- Haemophilia
- Cerebral amyloid angiopathy/hypertension
- Anticoagulation therapy
- Illicit sympathomimetic drugs (e.g. cocaine and amphetamines)
- Vascular malformations (younger patients)
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)
- Increasing prevalence with age
- More common in men
- Intra-cerebral haemorrhages more common in Asians.
Three quarters are intra-cerebral haemmorhages and the rest are sub-arachnoid.