Strokes and seizures Flashcards

1
Q

Is norman neurological activity synchronous or asynchronus?

A

asynchronus

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2
Q

what do the symptoms of a seizure depend on?

A

where it takes place within the brain (what area of the brain is affected)

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3
Q

broca’s and wernikes ? what are they responsible for?

A

production and understanding of speech respectively

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4
Q

what are the 2 categories of seizures

A

focal or generalised (part of the brain - pt will be aware of the seizure

or all of the brain - pt will be unaware of their surroundings)

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5
Q

Symptoms of tonic seizure

A

muscles become stiff and rigid

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6
Q

symptoms of atonic seizure

A

lack of tone to muscles can make you collapse to the floor

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7
Q

myoclonic

A

can make you jerk

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8
Q

tonic-clonic

A

classic seizures

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9
Q

what are the phases of a seizure

A

prodrome (can last for hours or days) - pt may feel light headed or irritable
- pt has a feeling seizure is on its way

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10
Q

what is aura ?

A

just before the seizure - headaches or changes in vision/sound

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11
Q

what is the ictal phase?

A

seizure phase -
motor changes and changes in awareness
some patients might not have aural phase at all

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12
Q

what is the post ictal phase

A

pt is sleepy, confused, headache
phase of cognital depression

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13
Q

are seizures always due to epilepsy?

A

NO! Not all seizures are due to epilepsy

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14
Q

what is the definition of epilepsy

A

2 or more unprovoked seizures

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15
Q

what is a provoked seizure?

A

hypoxia/hypoglycaemia, drugs/drug withdrawal can change neurone excitability, infection of the brain, structural change (trauma/tumour), vascular eg: stroke

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16
Q

what are some of the causes of epilepsy (chronic background causes)

A

structural, genetic, metabolic, autoimmune
idopathic (no underlying cause - unexplained)

17
Q

what kinds of tests are done for a person with a seizure?

A

clinical (blood test or metabolic causes)
brain imaging + EEG
anti-epileptic medications
surgery (eg for structural epilepsy)

18
Q

what are some examples of medications for epilepsy?

A

carbamazepine
levetiracetam
phenytoin (causes gingival overgrowth)
pregablin

19
Q

what kinds of questions would you ask a patient with MH of epiepsy?

A
  1. what type of seizure do they have?
    - ask them describe what happens to them (might need a friend or relative to describe it/ might have it in a care plan
  2. how often do they have the seizures?
    - are they still having frequent seizures? when was their last one?
    - are they well controlled with medications? (are they in remission- not having seizures as often)
  3. how long do the seizures usually last?
    - few minutes
    - prolonged >5mins
  4. how are their seizures usually managed
    - care plans? medications to take if they feel a seizure coming on
    - some patients will have medication to take to terminate a seizure? do they need some one to give this to them? or do you need to understand it
  5. how long do their post-ictal phase usually last?
    - what symptoms do they have in that time
    - what is their typical recovery time
20
Q

how do you manage a tonic - clonic seizure?
- pt will go very stiff (tonic phase)
- pt will breathe out with a very large groan
- pt will have symmetrical rhymical muscle contractions throughout their for body for a few mins (bite tongue, drool, potentially incontenence)

A

STOP!
Safety - lower the dental chair BUT don’t hold them down, try and protect their airway but do not try put fingers in their mouth, encourage a head tilt chin left to help open the airway but don’t brace the pt as will hurt their neck
Time - start the stopwatch - a seizure becomes prolonged at 5mins - at this point 80% of prolonged seizure will become status epilepticus (last around 30mins)
- IF PT HAS PROLONGED SEIZURE WHICH IS NOT KNOW TO HAVE PROLONGED THEN CALL AMBULANCE!!
Oxygen - Pt stops breathing in tonic phase - so they will become hypoxic (blue/cyanosed) and will struggle to keep pulse oximeter on them
- SO ADMINISTER 15/L of oxygen via a non-rebreather face mask
Plan- does pt have a care plan - if so follow it! if pt does not have history of epilepsy call an ambulance! if something outside of their normal - CALL AMBULANCE

21
Q

how long should you monitor a patient for after a seizure?

A

1 hour to rule out serial seizures (3 or more in an hour)

22
Q

what should you do for the post-ictal phase?

A

Recovery postition
ABCDE
Wean oxygen slowly
Discharge

23
Q

what is a stroke?

A

acute - the blood supply to the brain is interrupted and the brain tissue dies

24
Q

what are the 2 categories of stroke?

A

ischaemic (caused by some blockage to blood flow) - usually 85% are ischaemic and typically caused a blood clot or thrombosis

and hemorrhagic (bleed in the artery that supplied the brain)

25
Q

what is a TIA?

A

transient ischaemic attack
- temporary (called a mini stroke)
- the symptoms are the same as a stroke but last for 24 hrs
- same risk factors of a stroke

26
Q

what are symptoms of a subarachnoid haemorrhage?

A

thundering headache
stiff neck
patients can feel quite sick
not tolerating bright lights

27
Q

what should you do if you suspect a subarachnoide haemorrhage?

A

CALL 999

28
Q

what are the risk factors for a stroke?

A

similar to that of CVD
- hypertension
- high cholesterol
- atherosclerosis
- diabetes
- smoking and drinking
- arterial fibrillation
- Patent foramen ovale - hole in the heart between left and right atrium

29
Q

what is FAST?

A

Face - is it drooping? can they smile? is one eye drooping?
Arm - is there loss of sensation in one arm? can they raise both arms?
speech - is there speech affected? is there disarthria (difficulting in enuciating words) are they repeating a particular word? do they understand the instructions given?
Time - critical - call 999

while waiting for ambulance do ABCDE and manage

30
Q

what is the diagnosis and management of stroke?

A

Neurology exam -
CT head - brain imaging for evidence of ischaemic or haemorrhagic
Thrombolysis (clot dissolving drugs)/ thrombectomy (surgically removing the clot) = NEED TO BE DONE WITHIN 4 HRS of the symptoms starting !!!
lumbar puncture (take a small sample of fluid from spinal fluid and detect for red blood cells)/angiogram
neurosurgery (fill an aneurysm with coils to fill it up)

31
Q

What is the aftermath of a stroke?

A
  1. Investigate the reason why the stroke took place - assess pt blood pressure, cholesterol, ECG (to check for atrial fibrillation), image the carotid artery to look for stenosis
  2. Pharmacological level - antiplatelets or anticoagulants/ statin/anti-hypertensive
  3. Rehabilitation - multidisciplinary team (physiotherapy to regain strength), occupational therapy, speech and language therapy, nutrition, psychology
32
Q

What are the dental considerations for a patient who has had a stroke?

A
  1. Defer tx for 6m
  2. Accessibility to dental practice (wheelchair? / travelling?) given info more slowly to process info
  3. Difficulty swallowing/chewing - increased risk of aspiration , OHI is v important + may be struggling to
  4. Risk of aspiration
  5. Drug interactions + side effects
  6. Potential sensitivity to sedatives/ opioids
  7. Limit LA + avoid adrenaline in gingival retraction