Vascular System & Stroke - Stroke Rehab Flashcards
Subjective disability
Ill health with absence of objective disease
Subjective well-being
Feeling good but having severe objective disease
Common psychosocial impacts of illness in severe condn
Disruption to normal life
Demand of treatments and care
Uncertainty of future
What do impacts of illness and their consequences depend on
Nature of condn (e.g. severity, course, symptoms)
Individual (e.g. age, expectations, coping)
Social factors (e.g. support, resources)
Sequence of psychosocial impacts of illness
Disease/ disorder –> impairment/ symptoms –> limitations/ disability –> restrictions —> dependency –> affects well-being —> changes life-evaluation
Impacts of acute vs chronic illness
Acute illness causes fear, uncertainty but pt can enter ‘sick role’
Chronic illness comes with challenge of continuing obligations of normal life and managing illness but w/ new limitations
Assessing subjective experience
Health status (e.g symptoms)
QoL (e.g. happiness)
HQRL (e.g. meaning)
Functional status (e.g. limitations)
PROMS
Pt Reported Outcome Measures
Key domains of illness impact
Perceived health (symptoms) Physical functioning Occupational/ role functioning Social functioning Emotional functional Cognitive functioning
Clinical reasons for measuring psychosocial impact
Screening for hidden problems
Identifying & prioritising problems
Communication
Identifying preferences, shared decision-making
Monitoring change/ response
Aid in treatment & resource allocation decisions
Emotional impacts of illness
Many c/c illness cormobid w/ depression creating further worsening of health (e.g. angina, arthritis, asthma, diabetes)
Severe, sudden physical condns can also trigger anger, anxiety, depression
Causes of anxiety in illness
Outcomes/ results of illness/ treatment
Unknown procedures
What does anxiety in illness result in
Irrational beliefs and heightened awareness of symptoms
Alters perception, interpretation and recall
Depression definition
An effective (mood) disorder characterised by feeling sadness and general withdrawal from those around us Associated w/ suicide, poor adherence and poor motivation
Why do we treat emotional impacts of illness
Physical and mental health aren’t separate
Increases survival, decreases risk of complications, increases QoL, poor treatment outcome and decreases cost of care
Haemostasis
Normal blood clotting
Thrombosis
Excessive blood clotting
Thrombophilia
Predisposition to blood clots
Fibrinolysis
Natural clot destruction
VTE
Venous thromboembolism
Incl DVT/ PE
Causes of clots
Virchow’s triad
Endothelial injury
Hypercoagulability
Stasis of blood flow
Types of clots
Red clots
White clots
Where are red clots found
Arteries (arterial)
Where are white clots found
Veins (venous)
Arterial thrombosis condns
Stroke
MI
PVD
Venous thrombosis condns
VTE
Thrombophlebitis
Risk factors for red clots
Aging Cholesterol deposition HTN DM Smoking
Risk factors for white clots
Genetic - APLS
Malignancy
Immobility
Drugs
Red clot composition
Mainly platelets, minimum fibrin
White clot composition
Mainly fibrin, minimum platelets
What do anti platelet agents prevent
Platelet adhesion, activation and aggregation.
What do fibrinolytic agents increase
Conversion of plasminogen to plasmin
Plasmin degrades fibrin and breaks up thrombin
What do anti-fibrinolytic agents prevent
Conversion of plasminogen to plasmin
Main groups of blood thinners
Anticoagulants
Anti-platelets
Thrombolytics
Types of anticoagulants
Oral anti-coagulants
Parenteral anti-coagulants
What are anti-coagulants used for
Prevention of venous thrombus development or extension of thrombus in venous circulation
DOACs
Direct Oral Anti-Coagulants
Main DOACs
Apixaban
Dabigatran
Edoxaban
Rivaroxaban
Benefit of DOAC’s vs warfarin
No routine monitoring requirements
Indications for DOAC’s
Stroke prevention if AF pt
All except edoxaban can be used for VTE prophylaxis after elective hip or knee replacement suregry
Reversal agent for dabigatran
Idarucizimab
Reversal agent for apixaban and rivaroxaban
Andexanet
Parenteral anti-coagulants
Heparin LMWH Heparinoids Hirudins Fondaparinux
When would heparin be used over LMWH
Those w/ high risk of bleeding - can terminate rapidly by stopping infusion
Uses of LMWH
Prevention and treatment of VTE
Examples of LMWH
Enoxaparin/ Dalteparin/ Tinzeoparin
Heparinoid
Danaparoid - used for prophylaxis for DVT in pts undergoing general or orthopaedic surgery
Example of a hirudin
Bivalirudin - direct thrombin inhibitor
Can also be used to treat NSTEMI
Types of oral anti-coagulants
DOACs/ NOACs
Vit k antagonists - warfarin, acenocoumarol
Direct Xa inhibitors
Rivaroxaban
Apixaban
Edoxaban
Direct thrombin inhibitors
Dabigtran
Bivalirudin
Fondaparinux
Synthetic pentasacharide
Inhibits factor X
Examples of anti-platelet agents
Aspirin
Clopidogrel, Prasgrel, Ticraglor
Dipyridamole
Examples of fibrinolytics/ thrombolytics
Steptokinase
Alteplaste
Retreplaste
Tenectoplase
Antidote for heparin and LMWH
Protamine sulphate
How long does warfarin take to have an effect
48 - 72 Hrs
What must be monitored with warfarin
INR
INR
International Normalised Ratio
Normal INR
1
Higher the INR, thinner the blood
INR of 2 = takes blood 2x as long to clot
Warfarin reversal
Vit K - main agent
FFP
Spp clotting factor
Aspirin MOA
Irreversibly inactivates COX -1 and alters balance between TXA2 and PGI2
Clopidogrel MOA
Inhibits ADP induced aggregation
Typical drugs given after arterial thrombosis
Fibrinolytic (alteplase) given acutely Aspirin 300mg stat 2/52 Clopidogrel 75mg OD Statins initiated within 48 hrs regardless of serum [Cholesterol] DOAC's for AF pts
When should alteplase be given after a stroke
Within 4.5 hrs of onset
What type of anti-hypertensive should be used following a stroke
Beta-blockers
When can drugs be given for an ischaemic stroke
After excluding ICH stroke
Advantages of thrombolytics
Improved long term outcomes i.e., function and independence
Disadvantage of thrombolytics
Small window of use, for stroke require CT first
Risk of ICH (1%)
No H/O trauma/ surgery/ Haem stroke/ dental procedure
When to use DOACs w/ caution
If ClCr < 30ml/min (dabigatran)
If ClCr < 15ml/ min (apixaban, rivaroxaban, edoxaban)
Depending on age and wt
TXA2
Thromboxane A2
PGI2
Prostacyclin
Clinical use of aspirin
Acute treatment of ACS and stroke
2’ prevention of arterial thrombosis after cardio/cerebrovascular events
Prevention of pre-ecclampsia
Adverse effects of aspirin
GI bleeding
Bronchospasm
Toxic doses cause respiratory alkalosis followed by acidosis
Heparin MOA
Accelerates action of anti thrombin - inactivates factors Xa and thrombin (IIa)
Also effects IXa, XIa, XIIa
Heparin administration
S/c or IV infusion
Clinical use of heparin
Treat DVT/ PE
Unstable angina
Acute peripheral arterial occlusion
Adverse effects for heparin
Bleeding - main effect
Thrombocytopenia
Hypersensitivity reactions
Osteoporosis
Administration of clopidogrel, prasugrel, ticagrelor
Given orally, loading dose first then OD
Clinical use of clopidogrel, prasugrel, ticagrelor
Prevention and treatment of MI and other vascular events
Often given with aspirin (increases effects)
Adverse effects of clopidogrel, prasugrel, ticagrelor
Bleeding GIT discomfort Rashes Neutrepenia - rarely Ticagrelor can cause dyspnoea
Administration of fibrinolytics
Iv injection or infusion
Clinical use of fibrinolytics
MI
A/c ischaemic stroke and other arterial thrombosis
Severe cases of DVT/ PE
Adverse effects of fibrinolytics
Bleeding - most important
Reperfusion dysrhythmias
Nausea and vomiting
Hypersensitivity reactions
LMWH MOA
Accelerates action of antithrombin increasing its inactivation of factor Xa
LMWH administration
S/c injection
Clinical use of LMWH
Prevent VTE
Treat DVT/ PE, MI, unstable angina
Adverse effects of LMWH
Bleeding - main effect
Less likely than heparin to cause thrombocytopenia, hypersensitivity reactions, osteoporosis
Warfarin MOA
Vit K antognist
Prevents carboxylation of factors II, VII, IX and X
Functional assessment done by PTs
Baseline mobility, ROM, muscle power, sensation, balance
Stroke management done by PTs
Resp (tracheostomy)
Early mobilisation and promoting neurological recovery
tone and spasticity management
Discharge planning
Preventing complication - aspiration pneumonia
Hierarchy of cognition
If the lower levels are impaired, a person will not be able to achieve the higher levels
Sensory (bottom) –> Attention –> perception –> memory —> praxis –> executive (top)
Executive function - cognition
Ability to make choices, set goals, plan and organise a task
Acute complications post stroke
HTN PE Complications w/ nutrition and feeding Aspiration pneumonia Malignant MCA syndrome
Shoulder subluxation due to stroke
Consequence of weakness of shoulder girdle
Wt of upper limb drags on shoulder capsule and ligaments
Management of shoulder subluxation due to stroke
Good moving and handling
Positioning
Analgesia
Orthotics
Spasticity
Condn in which there is an abnormal increase in muscle tone or stiffness of muscle, which might interfere w/ movement, speech, or be associated with discomfort or pain
Management of spasticity
Eliminating aggravating factors Antispasmodics/ Botulinum toxin Analgesia Splinting and casting Positioning and casting Positioning in bed and chair Passive stretches
Exacerbating factors of spasticity
Incontinence Constipation Pain Pressure sores Infection General discomfort
Considerations for d/c planning
Is the pt able to raise an alarm in emergencies
How will the pt get in/out of a bed/ chair/ toilet
Can they manage stairs
Independently prepare modified meals
Initiate and remember to do ADL
Returning to driving or arranging transportation
What do statins reduce
Cholesterol
Triglyceride levels
Surgical treatment for ICH
Removal of haemotoma to relieve ICP
Treatment for ICH strokes
Pts should be given rapid bp lowering drugs (IV)
Pts taking anti-coagulants should have it reversed
What needs to be prescribed alongside DOACs and Asp/ Clop
PPi in those over 60 and/or a hx of dyspepsia
What kind of stroke is usually seen in younger pts
Haemorrhagic
Usually presents with sudden, severe headache due to increased ICP
Communication disorders after stroke
Aphasia
Dysarthria
Apraxia of Speech
Dysphonia
Aphasia
An acquired communication disorder that impairs a person’s ability to process lang, but does not affect intelligence
When does aphasia occur
When there is damage to the area of the brain responsible for lang (Broca’s and Wernicke’s) - located in left hemisphere for majority of pts
Approximately how many pts will have a degree of aphasia following a stroke
Around 1/3
Types of aphasia
Different names depending on what areas of communication are affected
Expressive aphasia
Receptive aphasia
Acquired dysgraphia
Acquired dyslexia
Expressive aphasia
Affects pts speaking - Broca’s area
Varies in severity from being completely unable to speak to occasion difficulties finding target word
Might get stuck on words
May be able to use drawings/ writing/ symbols
Receptive aphasia
Affects auditory comprehension - Wernicke’s area
Irrelevant answers to q’s
Usually able to recognise & use social phrases
Unlikely to realise they have receptive difficulties
Acquired dysgraphia
Affects writing
Acquired dyslexia - aphasia
Affects reading
Strategies to help communication w/ aphasic pts
Minimise or eliminate background noise where possible
Make sure you have their attention
Encourage all modes of communication
Try not to patronise but simplify sentence structure
Dysarthria
A speech disorder due to muscle weakness or incoordination
Motor issue
How does speech sound with dysarthria
Can be slurred/ unclear
Can sound quiet or monotone
Anarthria
Total loss of motor ability that enables speech
When is anarthria seen in
Brainstem strokes - as well as ‘Locked-In Syndrome’
What is Apraxia of Speech also known as
Verbal dyspraxia
AOS
An oral motor speech disorder - pathways between motor cortex and facial muscles have been disrupted resulting in limited and difficult speech ability
How may a pt with AOS present
With dysfluencies, inconsistent speech errors and repetitive muscle movement
What are pts with AOS good at
‘Automatic speech’ - yawning, counting, swearing etc
What does pure AOS mean
Language is fully intact - comprehension is good and there are word finding difficulties
Dysphonia
Weakness (infl) in the laryngeal muscles resulting in reduced or no movement in one vocal cord
What do pts with dysphonia sound like
Their voices sound rough/ strained/ hoarse - abnormalities of pitch, loudness, quality and variability
Some also completely lose their voice
Communication and the MDT
OT PT Nursing team Medical team Pharmacy Stroke research team Safeguarding team Continuing healthcare/ social work d/c team
Dysphagia
Term for swallowing difficulties
Most common causes of dysphagia
Stroke
Brain injury
Other neurological disorders
What can dysphagia affect
Ability to eat and drink safely, can cause food and drink to enter airway –> choking, chest infections (aspiration pneumonia)
Stages of normal swallow
Pre-oral
Oral
Pharyngeal
Oesphageal
What can happen when swallowing goes wrong
Aspiration Silent aspiration Malnutrition/ dehydration Missing key meds Impacts on pleasure and socialisation
Clinical assessment of swallowing
Videofluroscopy aka modified Barium Swallow
Fibreoptic Endoscopic Evaluation of Swallowing (FEES)
Alternative methods of feeding
NG tube/ bridle NGT
PEG/ RIG
Risk feeding
Main types of drug receptors
Ligand-gated (ion channels)
G protein coupled receptors
Kinase linked receptors
Nuclear receptors
Ligand - gated ion channels (ionotropic receptors)
Receptor is linked to the ion channel
Activation (agonist) = influx of ions
Time scale - milliseconds
G protein coupled receptors
G protein coupled receptors on cell membrane surface, once activated signal second messengers linked to enzymes or ion channel
Time scale - seconds
Kinase-linked receptors
Receptors linked to enzyme
Binding site for larger molecules like ligands (growth factors, cytokines)
Gene transcription –> protein synthesis
Time scale - hrs
Nuclear receptors
Receptors that are linked to gene transcription
Cause proteins synthesised to take cellular effect
Examples of ligand-gated ion channels receptors
Nicotinic acid and Ach
Examples of G protein-coupled receptors
Opiate receptors & morphine
Examples of kinase-linked receptors
Tyrosine kinase and growth factors
Examples of nuclear receptors
Corticosteroids, thyroid, hormone (oestrogen)
Agonist
Drug that binds to receptor and elicits a repsonse
Antagonist
Drug that binds to receptor site and doesn’t elicit a response/ block agonist from working
Example of antagonist
Naloxone (reverses the effect of morphine) - has no effect if given to pts that aren’t taking opiates
Partial agonist
Drug that binds to receptor site and elicits a partial response (even with full receptor capacity)
Types of antagonist
Competitive
Non-competitive
Competitive antagonists
Will compete for same receptor, can be overcome if we increase conc of the agonist, displacing it.
Non-competitive antagonists
Will not compete, often these agents cannot be displaced as they bind irreversibly
Selectivity
Tendency of a drug to affect a spp receptor
Receptor changes over time
Desensitisation Tolerance Up-regulation Down-regulation Exacerbation
Desensitisation - receptors
When receptors become less receptive to frequent doses of the same drug over a short period of time, which can lead to tolerance
Tolerance - receptors
Requiring a bigger dose for the same response e.g. opioids, transdermal nitrates
Up-regulation - receptors
Prolonged use of an antagonist, receptors up-regulate to minimise effect of antagonism.
Example – atenolol
Down-regulation - receptors
Prolonged use of an agonist, receptors down-regulate and minimises receptor affinity to minimise effect of antagonism
Exacerbation - receptors
Body has adapted itself to the exogenous agent. Removing it can exacerbate the condn you are trying to treat
What does therapy optimisation involve
Ensuring optimal therapeutic effects over adverse effects
Looking at If its not working, side-effects or not needed anymore
Fine tuning dose for Narrow Therapeutic drugs
Where is the Therapeutic Index found
Between ED50 and TD50
When do we need to monitor drug levels
Overdose Poor clinical response Suspected toxicity Rule out poor compliance Drug interactions Non-linear kinetics
Types of adverse drug reactions
Type A reactions (pharmalogical)
Type B reactions (idiosyncratic)
Type A ADR
Predictable
Dose dependent
Readily reversible (reducing dose/ withdrawing)
Common (80% of all reported ADRs)
Type B ADR
Non-predictable
What do doses adjust according to
Wt Renal function Liver function Body surface area (BSA) Nomograms
When is drug monitoring less important
Predictable pharmacokinetics
Broad therapeutic range
Less individual variation
Minimal/ transient side effect profile
Depression as a stroke complication
Anterior circulation strokes can cause changes in personality & emotion
Stroke is a life-changing event so can be psychological change
Treating depression as a result of stroke
Mood screening
SSRIs, if not effective then nortriptyline
Psychotherapy
Why should nutrition be treated after a stroke
Dehydration and malnutrition can lead to an increase in infections, cellular dysfunction and death if persistent
How can we prevent inadequate nutrition after a stroke
Dysphagia assessments NG tube as short term solution PEG feed if persisting >4 weeks Diet modification Rehab exercises - tongue strengthening exercises
Pressure sores
Injuries to the skin and underlying tissue, caused by prolonged pressure on the skin
Why should pressure sores be treated
If left untreated, can lead to infections such as cellulitis, OM and sepsis which can be life-threatening
How can we prevent/ treat pressure sores
Encourage early mobilisation (such as turning)
Monitor pressure areas
Wound care such as cleaning and applying dressings
Ensuring adequate nutrition
Using a pressure-relieving mattress