Stroke Flashcards

1
Q

What is a stroke?

A

Occurs when the blood supply to part of the brain is cut off​.

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2
Q

What are the main types of stroke?

A

Ischaemic​.
Haemorrhagic​.
Transient ischaemic attack (TIA).

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3
Q

What are the symptoms of stroke?

A

Face:

Dropped on 1 side.
Person may not be able to smile.
Mouth or eye may have dropped.​

Arms - unable to lift both arms & keep them there​.

Speech:

May be slurred or garbled.
May not be able to talk at all.​
May also have problems understanding what you’re saying to them.​

Time – time to dial 999​.

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4
Q

How would you determine the severity of a stroke?

A

NIHSS score:

Score Stroke Severity​

0 No stroke symptoms​

1 - 4 Minor stroke​

5 - 15 Moderate stroke​

16 - 20 Moderate to severe stroke​

21 - 42 Severe stroke​

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5
Q

What imaging would be used for TIAs?

A

MRI - consider post TIA assessment by specialist​.

CAROTID - if considered to be a candidate for carotid endarterectomy post TIA assessment​.

Specialist unit Brian Imaging for acute stroke​.

CT - for acute stroke​.

CT is sensitive to the intracranial blood and is readily available. Therefore, CT rules out hemorrhagic stroke. ​

However, CT Scan changes in ischemic stroke may take several days to develop. ​

​MRI may be a better option. ​

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6
Q

What is initial TIA management​?

A

Aspirin 300mg​.

TIA referral​.

Don’t use ABCD2 as risk of stroke tool​.

Start secondary prevention in addition to aspirin​.

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7
Q

What is the treatment for acute ischaemic stroke?

A

Alteplase < 4.5hrs​.

Thrombectomy.

​Aspirin 300mg po/pr 2/52. ​

​Start people on long-term treatment earlier if they are being discharged before 2 weeks​.

​PPI + aspirin if previous dyspepsia associated with aspirin is reported.​

​Offer alternative antiplatelet agent if allergic/ genuinely intolerant of aspirin. ​

Not routinely anticoagulated.​

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8
Q

How would you treat haemorrhagic stroke​?

A

Return clotting levels to normal asap if PIH + previous warfarin​.

Use a combination of prothrombin complex concentrate and intravenous vitamin K.​

DOACs​.

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9
Q

What are some anticoagulation treatment options for other comorbidities​?

A

Atrial fibrillation.​
Prosthetic valves. ​
Ischaemic stroke and symptomatic proximal DVT or PE​.
Haemorrhagic stroke and symptomatic DVT or PE​.

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10
Q

How would you control blood pressure for people with acute ICH​?

A

Rapid blood pressure lowering :​
Present within 6 hours of symptom onset and​
have a systolic blood pressure over 150 mmHg.​

Aim for systolic blood pressure t of 130 to 140 mmHg within 1 hour of starting treatment and maintain this blood pressure for at least 7 days.​

DO NOT offer rapid blood pressure lowering:​

  • underlying structural cause (e.g. tumour, arteriovenous malformation, aneurysm)​
  • Glasgow Coma Score of below 6​
  • going to have early neurosurgery to evacuate the haematoma​
  • have a massive haematoma with a poor expected prognosis.​
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11
Q

What would you give to control blood pressure for people with acute ICH​?

A

Aged 55 or over /African or Caribbean at any age​:

Start with a long-acting dihydropyridine calcium channel blocker or a thiazide-like diuretic​.

Add angiotensin converting enzyme inhibitor (ACEI) or angiotensin II receptor blocker (ARB) if target blood pressure is not achieved​.

​If not of African or Caribbean origin and younger than 55 years:

Start with ACEI or an ARB​.

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12
Q

When should you consider statin treatment?

A

Immediate initiation of statin treatment is not recommended in people with acute stroke​.

Continue statin treatment in people with acute stroke who are already receiving statins.​

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13
Q

What blood glucose concentration should be maintained in people with acute stroke?

A

Maintain a blood glucose concentration between 4 and 11 mmol/litre in people with acute stroke.

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14
Q

Why is stroke so damaging to the brain?

A

The brain is a very high maintenance organ and requires constant supply of oxygen and glucose.​

​Oxygen and glucose are delivered to the brain through brain vasculature. ​

​Smallest insult to our brain vasculature will have tremendous effect on brain metabolism and function leading to severe damage and possible death.

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15
Q

What is a transient ischaemic attack (TIA)?

A

Temporary focal neurological deficit of sudden onset caused by ischemia of the brain, spinal cord or retina lasting less than 24 hours followed by complete recovery. ​

​New definition: No objective evidence of acute infarction in the affected region of brain or retina; < 1 hour. ​

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16
Q

What are some modifiable factors for ischemic stroke?

A

Major: ​

Hypertension.​
Heart disease, esp. atrial fibrillation.​
Cigarette smoking. ​
Transient ischemic attacks. ​
Dyslipidaemia. ​
Physical inactivity. ​
Obesity.

Less well documented:​

Excessive alcohol intake. ​
Drug abuse. ​
Acute infection​.

17
Q

What are some non-modifiable factors for ischemic stroke?

A

Major: ​

Prior stroke/ transient ischemic attack​.
Increased age.​
Being male​.
Race (e.g African- Americans)​.
Diabetes​.
Family history of stroke​.
Asymptomatic carotid bruit (systolic noise)​.

Genetic factors: ​

Apolipoprotein E4​.
Elevated Homocysteine labels.​
Factor V mutation​.

18
Q

What are the warning signs​ of stroke?

A

Sudden weakness, paralysis or numbness of the face, arm and the leg on one or both sides of the body​.

​Loss of speech, or difficulty speaking or understanding speech​.

​Dimness or loss of vision, particularly in only one eye​.

​Unexplained dizziness (especially when associated with other neurologic symptoms) unsteadiness or sudden falls​.

Sudden severe headache and/or loss of consciousness​.

19
Q

What is atherosclerosis?

A

Potentially serious condition where arteries become clogged with fatty substances called plaques, or atheroma.

20
Q

What is thromboembolism?

A

Thromboembolism is the name for when a blood clot (thrombus) that forms in a blood vessel breaks loose, is carried by the bloodstream, and blocks another blood vessel. This is a dangerous condition that can affect multiple organs, causing organ damage and even death.

21
Q

What is the surgical management of stroke? ​

A

For Ischemic stroke: ​

Endovascular interventions: angioplasty and stenting, mechanical clot disruption, clot extraction. ​
Carotid endarterectomy​.
EC/IC bypass surgery.

​For intracranial haemorrhage: surgical evacuation of haematoma. ​

For subarachnoid haemorrhage: clipping and coiling of aneurysm. ​

Surgical decompression of cerebellar haematoma. ​

22
Q

What supportive care should be provided to an acute stroke patient?

A

Maintenance of adequate tissue oxygenation: protecting the airway, O2 inhalation​.

​Maintaining optimal blood pressure (autoregulation faulty or lost in stroke patients)​.

​Management of blood glucose abnormalities (hyperglycaemia associated with poorer prognosis)​.

​Management of fever and infections (ischemia worsened by hyperthermia, improved by hypothermia).​

23
Q

What is the treatment of thrombolysis?

A

Alteplase and streptokinase: ​

Plasminogen activators that increase plasmin level; a potent serine protease involved in the dissolution of fibrin blood clots ​

​Patient profile: ​
Normal CT scan. ​
BP <180/100 mmHg.​
No bleeding tendency.​

​Reduced morbidity by 30%​.

​Risk: Intracranial haemorrhage in 6% of patients​.

24
Q

When should you give anticoagulants?

A

If hemiplegia is dense, commence subcutaneous heparin 5,000 units every 12 or 8 hours.​

​Low dose subcutaneous low-molecular-weight heparin or unfractionated heparin may be considered for prevention of deep vain thrombosis (DVT) in patients with intracerebral haemorrhage after 4 days from onset.​

25
Q

What is the mechanism of action of anticoagulants?

A

During the clotting cascade, a chain of precursor proteins (denoted by roman numerals) activate one another to amplify clotting. ​

​Heparin catalyses the binding of antithrombin II (ATII) to these proteins. ​

​This inactivates these clotting proteins. ​

26
Q

Why are antiplatelets used to treat ischemic stroke?

A

Aspirin within 48hrs reduces risk of mortality/ disability in ischemic stroke.

Antiplatelets contraindicated in haemorrhagic stroke​.