Stroke and TIA - Acute investigation and Management Flashcards Preview

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Flashcards in Stroke and TIA - Acute investigation and Management Deck (38):
1

 

 

If someone presented with clinical features suggestive of a stroke, what would you do?

 

  • ABCDE
  • History - Exact onset, changes/progression, Risk factors
  • Examination - full neuro exam, systemic and risk fcator exam
  • CT - within 1 hour presentation

2

 

 

When would you treat hypertension in someone presenting with a stroke?

 

 

  • Hypertensive emergency (encephalopathy/aortic dissection)
  • If thrombolysis is being considered

3

 

 

How long after presentation with symptos of a stroke should someone get a CT head?

 

 

Within 1 hour

4

 

 

When is CT/MRI within the first hour of presentation with stroke sypmtoms essential?

 

  • If thrombolysis considered
  • High risk of haemorrhage
  • Unusual presentation - fluctuating consciousness

5

 

 

What is the most sensitive imaging modality for detecting acute infarction?

 

 

Diffusion-weighted MRI 

6

 

 

What happens at a cellular level when cerebral infarction occurs?

Hypoxic damage:

  • Na+/K+ pump Fails -> Na+ accumulates in the cell -> osmotic shift into cell -> cellular swelling
    • Cells in the immediate area around the infarct die very quickly, as they swell and burst. Cells in "penumbra" are relatively less oematous, and can be "saved"
  • Excitotoxicity - Damage as a result of prolonged depolarisation of cells in affected area
    • Results in failure of AMPA and NMDA receptors - allows excessive calcium into the cell. This causes release of free radicals, production of cytokines, and direct apoptotic effects in the penumbra

 

7

 

 

What specific things might you look for on examination in someone presenting with features of a stroke?

 

  • Thorough, full neruo exam - clinical diagnosis and lesion localisation
  • Pulse (AF)
  • Heart sounds (valve disorders)
  • Carotid Bruit
  • Signs of PVD
  • Bruising/Bleeding
  • Xanthalasma/Xanthoma/Corneal arcus
  • Tar Staining

8

 

 

When would you consider thromblysis in someone presented with a stroke?

 

 

Once haemorrhage has been excluded as cause, and within 4.5 hour window of onset (benefits outweigh risks within this window)

9

 

 

Within what time frame are the best results achieved using thrombolysis?

 

 

Within 90 minutes of onset

10

 

 

What thrombolytic agent is most commonly used in stroke management?

 

 

Alteplase

11

 

 

What are contraindications to thrombolysis in a stroke?

Look them up - Impossible to remember all of them!!! - think of categories of contraindications

  • Stroke related
  • Neurological
  • Bleeding tendency
  • Trauma
  • Medical problems

12

 

 

What are stroke related contraindications to thrombolysis

 

  • Rapidy improving symptoms
  • Ischaemia of >1/3 MCA territory
  • Symptoms suggestive of SAH
  • Seizure at start of stroke

13

 

 

What are neurological contraindications to thrombolysis?

 

History of intracrnal bleed, aneurysm or neoplasma

Spinal or cranial surgery/injury

14

 

 

What bleeding tendency risk factors are contraindicaitons to thrombolysis?

 

  • Significant bleeding disorder
  • Therapeutic anticoagulation - LMWH, DOACs, Warfarin
  • Iron deficiency anaemia
  • Thrombocytopenia
  • Advanced liver disease

15

 

 

What are trauma related contraindications to thrombolysis in stroke?

 

  • Significant head injury <3 months
  • Major surgery/delivery/external heart massage <2 weeks
  • Puncture of non-compressible blood vessel <2 weeks

16

 

 

What medical problems are contraindications for thrombolysis in stroke?

  • SBP > 180/DBP >110
  • Active internal bleeding
  • Aortic aneurysm
  • Bacterial endocarditis/pericarditis
  • Acute pancreatitis
  • Haemorrhagic retinopathy
  • Oesophageal varices
  • Ulceratie GI disease <3 months
  • GI/GU haemorrhage < 3 weeks

17

 

 

If thrombolysis was contraindicated, what treatment would you start someone on for acute treatment of a stroke?

 

 

Aspirin PO/PR OD for 2 weeks

18

 

 

Why does diffusion weighted MRI detect early abnormalities seen in infarction better than normal MRI or CT?

 

This type of MRI exploits the fact that damaged cells fill with water – and thus contain more water than normal cells in the early stages of damage.

19

 

 

What intial investigations would you consider doing in someone presenting with a stroke?

 

  • CT/MRI - within 1 hour
  • MRI angiography
  • ECG
  • CXR
  • Bloods - ESR, FBC, clotting screen, glucose, Lipids/cholesterol

20

 

 

Why might you do an ESR on someone presenting with features of a stroke?

 

 

If with headache and tender scalp - Giant cell arteritis

21

 

 

Why might you do FBC or clotting in someone presenting with a stroke?

 

 

Look for evidence of clotting/bleeding disorders - thrombocytopenia, polycythaemia

22

 

 

What would you want to prioritise in your ABCDE assessment in someone presenting with a stroke?

 

  • Maintain airway
  • Prevent hypoxia
  • Hydrate
  • Treat fever / source of fever – this can help to limit the extent of damage
  • Treat hypo / hyperglycaemia

23

 

 

What dose of aspirin would you give someone if thrombolysis was contraindicated?

 

 

300 mg

24

 

 

How long would you put someone on aspirin treatment for following a stroke?

 

 

2 weeks

25

 

 

What medication would you start someone on following 2 weeks of aspirin treatment?

 

  • Clopidogrel long term - monotherapy
  • Consider Warfarin if AF the cause
  • Statin - 48 hours after stroke

26

 

 

What dose of clopidogrel would you give someone as long-term prophylaxis?

 

 

75 mg OD

27

 

 

What could you give someone if they did not tolerate clopidogrel for post-stroke prophylaxis?

 

 

Slow-release dipyridamole

28

 

 

What is the definition of a transient ischaemic attack?

 

 

A brief episode of neurological dysfunction due to temporary focal cerebral or retinal ischaemia without infarction, e.g. a weak limb, aphasia or loss of vision, usually lasting seconds or minutes with complete recovery. TIAs may herald a stroke. The arbitrary time of <24 hours is no longer used.

29

 

 

If someone presented with a TIA with amaurosis fugax, where might the occlusion be taking place?

 

 

Retinal artery occlusion

30

 

 

What are causes of TIA?

 

  • Atherothromboembolism
  • Cardioembolism - Mural thrombus, AF, Valve disease
  • Hyperviscosity - polycythaemia, sickle-cell, myeloma
  • Vasculitis - cranial arteritis, SLE, PAN

31

 

 

What are features of an anterior circulation TIA?

Carotid system

  • Amaurosis fugax
  • Aphasia
  • Hemiparesis
  • Hemisensory loss
  • Hemianopic visual loss

32

 

 

What are features of a posterior circulation TIA?

  • Diplopia, vertigo, vomiting
  • Choking and dysarthria
  • Ataxia
  • Hemisensory loss
  • Hemianopic visual loss
  • Bilateral visual loss
  • Tetraparesis
  • Loss of consciousness (rare)
  • Transient global amnesia (possibly)

33

 

 

If, on examination of someone presenting with signs of a TIA, you found there to be central retinal artery occlusion, where might this suggest there is stenosis in the carotid system?

 

 

Internal carotid artery stenosis

34

 

 

What differentials would you want to consider in someone presenting with features of a TIA?

  • Hypoglycaemia
  • Migraine aura
  • Focal epilepsy
  • Hyperventilation
  • REtinal bleeds
  • Malignant hypertension
  • MS
  • Intracrnaial tumours
  • Peripheral neuropathy
  • Phaeochromocytoma
  • Somatization

35

 

 

What investigations would you consider doing in someone with a suspected TIA?

 

  • Bloods - FBC, U+E's, Glucose, Lipids
  • CXR
  • ECG
  • Carotid doppler +/- angio
  • CT/Diffusion weight MRI
  • ECHO

36

 

 

How would you manage someone with a TIA?

 

  • Control risk factors - BP, DM, Hyperlipidaemia, Smoking
  • Antiplatelet therapy - Aspirin (300mg) for 2 weeks, then clopidogrel (75mg) long-term
  • Consider anticoagulation - AF
  • Consider carotid endartectomy - within 2 weeks of presentation if >70% stenosis and no contrindiations

37

 

 

How long after a TIA are individuals not allowed to drive?

 

 

1 month - Need to inform DVLA if stll symptomatic after 4 weeks or HGV driver

38

 

 

What scoring system could you use to stratify those who have had a TIA who might be at higher risk of stroke in the future?

 

ABCD2 score - score >/=4 indicates high risk of early stroke - assess by specialist in 24 hours