Stroke Flashcards

1
Q

What is stroke

A

WHO defines stroke as acute sudden onset of focal/ global neurological deficit which lasts more than 24 hours or results to patients demise which is due to cerebral vessels diseases

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2
Q

What is T I A

A

Is a brief episode of neurological dysfunction due to temporary focal cerebral or retinal ischemia without infarction lasting second to minutes and there is complete recovery

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3
Q

What is the epidemiological significance of stroke

A

*3rd most common cause of death
*Most disabling neurological disorder worldwide
*2/3rd cases occur in age 65 years
* stroke in the young : is stroke in people less than 45 years

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4
Q

Classification of stroke

A
  1. Ischemic stroke; account for 80%
    .2 Haemorrhagic stroke; 15- 20%
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5
Q

Risk factors of ischemic stroke

A

Modified and non- modified ischemic stroke

Modifiable risk factors; these are further subdivided into;
.i arterial factors
Ii. venous factors

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6
Q

Arterial factors: modifications

A

1.DM
2.Uncontrolled
systemic hypertension
3:Dyslipidaemia e X(Reaven’s I V.
Metabolic syndrom
syndrome); combination of hte 3 with central obesity
4. Cardiogenic factors like
afib (commonest), valvular heart disease, subacute bacterial endocarditis,
dilated CM, rheumatic heart disease and DVT (in the presence of septal defect/ shunt i.e. paradoxical embolism)
5:Tobacco smoking
6 Sedentary lifestyle
ix. Drug abuse
.x Connective tissue disorder xi. Vasculitides
7.Severe alcohol consumption

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7
Q

Venous factors

A

Venous
factors; cause hypercoagulability state
.i Pregnancy
Immediate post-partum
i. Deficiencies of protein C and S, factor Vleiden deficiency
vi. Hyperhomocystinuria
.v Intracranial infection
vi. Oral contraceptive pills
vi.Dehydration

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8
Q

Non modifieable risks

A

.i Age
i. Previous history fo stroke
ii. Family history fo stroke esp 1st degree relatives
vi. Gender; M>F fi <55YEARS, M=F after menopause
.v Race; afrocarribean> Asian>Caucasian
v.i
Hereditary stroke disorders; CADASIL, CARASIL etc

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9
Q

Mention 7 Risk factors hemorrhagic stroke

A

1.Severe hypertension
2.Bleeding disorders
3.Anticoagulants
4.Antiplatelet drugs
5.Pre-existing cerebral aneurysm
6.Vascular malformation eg AVM 7.Trauma

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10
Q

Common sites; of stroke in the brain

A
  • putamen (30%)
    *Thalamus(30%)
    *pons(10)
    *cerebellum(10)
    *others
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11
Q

Pathogenesis of neuronal death;ischemic stroke

A

*Ischemic stroke: Decrease cerebral blood flow, (<15ml/gm/min) i.e ischemic necrosis Normal=
50-70 ml/gm/min
* Na/Ca influx
* Necrotic cell death
(window period=3 hrs, max 41/2 hrs)
*Programmed cell death (apoptosis)

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12
Q

Pathogenesis of neural cell death hemorrhagic stroke

A

.i mass effect on neuronal tissues
i. toxic effect of blood itself
iii. tamponade of
surrounding

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13
Q

Classification of clinical diagnosis of stroke

A

1.Anatomical diagnosis
2.pathologic diagnosis

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14
Q

Anatomic diagnosis; locations

A

1.cortical, : aphasia, dysarthria, differential limb, w e a k n e s s, lateralising, hemianopsia,
Broca’s/Wernicke aphasia).
2.subcortical : dense ,hemiplegia, tremor, hemiparesis
3.brainstem: stroke; contralateral hemiparesis, cranial nerve palsy /deficit, dysathria, dizziness, respiratory or cardiovascular instability

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15
Q

Pathological diagnosis
Ischemic stroke vs hemorrhagic

A

1:Onset:hemorrhagic-Usually during peak of activity , ischemic stroke: Usually at rest
2:loss of consciousness: hemorrhagic stroke:usually present , ischemic stroke:maybe present
3: Headache:hemorrhagic stroke;severe throbbing headache, ischemic stroke:headache maybe be present
4: Convulsion:hemorrhagic stroke:there is convulsions ,ischemic stroke: No convulsions
5: Vomiting:hemorrhagic stroke :there is vomiting , ischemic stroke: No vomiting
6: Blood pressure: hemorrhagic stroke : there is severe high blood pressure,
7.Symptoms increase ICP; hemorrhagic stroke:There is marked
ICP,ischemic stroke not marked
8: Hx of past TIA: hemorrhagic stroke:No hx of TIA, ischemic stroke: There is hx of TIA
9: Meningism:HS: yes/No, ischemic stroke:No meningism

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16
Q

Investigations of stroke most important

A

Non contrast CT scan : scan of the
head; is the single most important investigation in stroke.
1:ischemic stroke : Hypodense lesion
2:hemorrhagic stroke : lesion
Hyperdense lesion, a; perilesional edem area of hypodensity surrounding the lesion.
Swell sign; scattered hypodensed points within the hyperdense lesion. It indicate on going bleeding

17
Q

Common CT features

A
  1. Midline shift to contralateral side
  2. Obliteration of gyri and sulci( cerebral edema)
  3. Obliteration of ventricular outline : ipsilaterally
18
Q

General investigations of stroke

A

-Serum E, U/ Cr; detect electrolyte imbalance and renal compromise
-RBS; glucose status, and need for insulin (RBS >12mol/1)
-Urinalysis;
-FBC and differential to rule out:infection
-Lumber puncture; rule out SAH, meningitis
-Chest X-ray
-ECHO; rule out cardioembolic source
-Lipid profile
-Coagulation profile; PT/PTTK
-VDRL
-ESR

19
Q

Treatment of stroke

A

*Aim is to salvage the penumbra. Treatment is divided into 3;
1. Hyperacute treatment (within 6 hours)
-Admit patient
-nurse 30 head up
-Give high flow 02
-Secure VI access and give ivf use N/S avoid dextrose containing fluid
* Decompress
- 20% mannitol 0.5-1gn/kg in 500mls over 20mins 8hrly in 24 hrs ( maximum 48hrs)
*Low dose furosemide may be
given. Steroid is not useful because edema is cytotoxic
-Thrombolytics: if patients present 3-5hrs
-Statins; plaque stabilizing
-B.P control; BP should not be lowered except t h e r e are certain indications.such as
* Persistent systolic BP >120mmhg
*DBP >120 mmhg
* Persistent MAP > 145mmhg
* Presence of hypertensive emergencies; dissecting aortic aneurysms , preeclampsia/ eclampsia.

2: Acute treatment
-Patient still on admission
-Continue IV fluid
-Start physiotherapy
-Prevent aspiration pneumonitis e.g NGT
-Give IM paracetamol for fever a n d
anticonvulsants for seizure
-Give insulin if RBS >12 mmol
-Calorie- provide adequate
* DVT prophylaxis;
-Compression stockings
-Low dose aspirin; contraindicated in hemorrhagic stroke
* Prevent bedsores;
-2hourly turning
-use of waterbed
-Pass a Paul’s tube for male and urethral catheter for
female patient with urinary incontinence
Identify underlying cause and address appropriately Surgery eg multiple bore hole/ brain flaps to decrease ICP by <1-2%.

20
Q

Continuing treatment
Sub-acute treatment 2( weeks) of stroke

A

Monitor patient for discharge -
CT physiotherapy
Give outpatient appointment - CT treatment of underlying cause

21
Q

Complications of stroke
:Acute complications

A

A. Acute complications (24-72 hours) .i I.Aspiration pneumonitis
i. Post stroke seizure
i. Cerebral edema
iv. Dehydration
.v Electrolyte imbalance

22
Q

Subacute complications of stroke

A

Subacute complications
i.Sepsis; from NGT, catheter,IV line i.DVT
iii.Bedsore iv.Hyperthermia v.Hyperglycemia vi.PEM
vii.Dehydration

23
Q

Chronic complications of stroke

A

i.Depression
ji.Dementia
i. Loss of job
iv.Epilepsy
v.Muscle wastage (disuse atrophy) vi.contacture

24
Q

Prevention of stroke

A

i.good BP control
Ii.good glycemic control
iii. prophylactic antiplatelets aspirin, clopidogrel

25
Q

Differential diagnosis of stroke

A

i.brain tumour
ii.brain abscess
iii.subdural hematoma
iv.epidural hematoma
v.ruptured SAH
vi.migraine
vii.seizure disorders