acute stroke care - dalhousie university · target door-to-needle (dtn) time of less than 60 min in...
TRANSCRIPT
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Steve PhillipsDivision of Neurology
DALHOUSIE UNIVERSITY
Department of Medicine
Acute Stroke Care
Dalhousie CPD · Aberdeen Hospital, New Glasgow · 11th April 2018
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HEALTH
For Many Strokes, There’s an Effective Treatment.
Why Aren’t Some Doctors Offering It?
By GINA KOLATA MARCH 26, 2018
https://www.nytimes.com/2018/03/26/health/stroke-clot-buster.html
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Outline
•Time is Brain!
•The importance of system & organization
•How are we doing?
•Deconstructing the Acute Stroke Protocol
•Treating more patients faster
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Last slide
1. Every minute counts!
2. Parallel processing essential
3. Keep the family close
4. Fast, focused clinical assessment
5. TPA (or not) ASAP after CT scan
6. Page Neurology if possible EVT candidate
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Disclosures - 1
• AstraZeneca
• Boehringer Ingelheim
• Bristol-Myers Squibb
• Hoffmann-LaRoche
• Merck Frosst
• Pfizer
• sanofi-aventis
• Servier
I have given CME lectures and served
on advisory boards for
The QEII Acute Stroke Program has
received support from
GlaxoWellcome, Hoffmann-La Roche,
Merck Frosst, sanofi-aventis, Servier, Bayer
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Disclosures - 2
• I was Canadian coordinator for the third
International Stroke Trial of t-PA
• I was on the International Advisory
Committee for the ENOS trial of
transdermal GTN for acute stroke
• I am on the International Advisory Board for
the RIGHT-2 trial of transdermal GTN for
ultra-acute stroke
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Disclosures - 3
• I was inaugural co-chair of the Best
Practices & Standards Advisory Committee
of the Canadian Stroke Strategy
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first released December 2006 ● continuously updated since
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Accompanying each recommendation:
Rationale
System implications
Performance measures
Resources for implementation
Evidence summary
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ATLANTIC EXPERTISE IN WORKING GROUPS
11
Pierre CraigManager, Ambulance Services, New Brunswick
Matthew CrossmanManager, EMS, Prince Edward Island
Dr. Marsha EustaceStroke Neurologist, St. John’s, Newfoundland
Dr. Brian MosesInternist, Yarmouth, Nova Scotia
Dr. Jo-Ann TalbotSaint John Regional Hospital, New Brunswick
Dr. Andrew TraversMedical Director, EHS, Nova Scotia
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Want to contribute?
Volunteers
Patrice Lindsay, RN, PhD
Director, Stroke
Heart and Stroke Foundation
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Disclosures - 4
• I was inaugural co-chair of the Best
Practices & Standards Advisory Committee
of the Canadian Stroke Strategy
• I am a Clinical Advisor for Cardiovascular
Health Nova Scotia
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7 Stroke Programs
1 Stroke System
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Nova Scotia Stroke System
• Stroke unit care
• Ambulance bypass protocols
• Enhanced rehabilitation staff
• Quality improvement focus on TPA therapy
• 2º prevention & rapid access TIA clinics
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Nova Scotia Stroke System
• Stroke unit care
• Ambulance bypass protocols
• Enhanced rehabilitation staff
• Quality improvement focus on TPA therapy
• 2º prevention & rapid access TIA clinics
• Dedicated coordinators & MD leadership
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Your Stroke Program Clinical Leaders
Michelle MacGrath – Program Coordinator
Dr. Mohammad Fahim
Dr. Mary Gorman
Dr. Graham Miles
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Nova Scotia Stroke System
Multifaceted approach to
quality improvement &
knowledge translation
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Nova Scotia Stroke System
Multifaceted approach to
quality improvement &
knowledge translation
Development via support,
implementation tools,
education, monitoring,
evaluation & feedback
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Disclosures - 5
• I was inaugural co-chair of the Best
Practices & Standards Advisory Committee
of the Canadian Stroke Strategy
• I am a Clinical Advisor for Cardiovascular
Health Nova Scotia
• I am a long-time volunteer for the Heart and
Stroke Foundation
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Stroke & TIA are time-sensitive emergencies
Stroke: act within minutes to hours
TIA: act within hours to days
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Risk of stroke after TIA or minor stroke
in the Oxford Vascular Study 2002-2003
n=87
n=87
Coull et al. BMJ 26 Jan 2004
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EXPRESS Study: prompt treatment reduced
risk of stroke after TIA by 80%
Days from
TIA10 20 30 40 50 60 70 80 90
prepost
Stroke risk
%
2
4
6
8
10
p=0.0001
Rothwell et al. Lancet 2007; 370:1432-42
fast-track clinic
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Act FAST because…
Loss per minute in a typical
MCA territory stroke:
• 2 million neurons
• 14 billion synapses
• 12 km of myelinated fibres
Saver, J. Time is brain – quantified.
Stroke 2006; 37: 263-266
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…the quicker you act, the betterOdds Ratio
(95% CI)
1.0
Treatment delay (h)1.0 2.0 3.0 4.5
3.0
6.5
1.4
1.8
2.6
2.2
Effect of timing of IV t-PA
on good outcome (mRS 0-1)
Emberson, et al. Lancet 2014; 384: 1929-35
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Fibrinolytic Therapy Trialists’ Group. Lancet 1994;343:311-322
Thrombolysis in Acute MI
h
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Time: the most important factor in acute stroke therapy
Emberson STTC Lancet 2014
100/1000good outcomes
50/1000 good
outcomes20/1000 good
outcomes
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Time is Brain
Emberson STTC Lancet 2014
Even a “short” delay attenuates benefit
Lost 10-20
good outcomes
per 1000 patients
Lost 50
good outcomes
per 1000 patients
Meretoja Neurology 2012;79:306-13; Stroke 2014
10 mins
90 mins
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TPA time-window considerations
Data related:
• Continuous decline
in treatment effect
• No additional hazard
by delay within 6 h
Clinical:
• Time measurement
imprecise
• How much benefit is
worthwhile?
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Symptomatic intracranial hemorrhage in
systematic review of stroke t-PA trials
OR 4.6 (2.9-7.1)
OR 3.7 (2.9-4.9)
Treated within 3 h
Treated between 3 to 6 h
0.5 1.0 5.0 10.0
All 5 trials before IST-3
All 6 trials before IST-3
IST-3
IST-3
All 6 trials (n=1779)
All 7 trials (n=4965)
Lancet 2012; 379: 2364-72
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Why aren’t some doctors
offering thrombolytic therapy?
• Don’t believe the evidence
• Guidelines advise against it
• Consent issues
• Clinical opinion
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2015 Position Statement
• Treat within 3 hours
• Neuroradiology and Neurology input
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Consent issues
• US guidelines recommend obtaining
informed consent when feasible
• Consent not addressed in Canadian
Best Practice Recommendations
• Obtaining consent delays treatment
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“In cases of medical emergency when the
patient (or substitute decision maker) is
unable to consent, a physician has the
duty to do what is immediately
necessary without consent.”
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“… a contemporaneous record (at the
time) should be made explaining the
circumstances which forced the
physician's hand.”
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And
If you don’t treat, document why
and
explain to the patient’s family
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ED physicians more often sued for not
giving tPA for stroke
Liang BA, Zivin JA. Empirical characteristics of litigation involving tissue
plasminogen activator and ischemic stroke. Ann Emerg Med. 2008; 52: 160-4.
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“tPA doesn’t help
much... it’s not like
treating MI”
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Treatment and outcomeBenefit
N / 1000 treated
IV tPA within 6 h of stroke*
- alive & independent months later 42
IV thrombolysis within 6 h of AMI#
- alive 35 days later?
*Emberson, et al. Lancet 2014; 384: 1929-35
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Treatment and outcomeBenefit
N / 1000 treated
IV tPA within 6 h of stroke*
- alive & independent months later 42
IV thrombolysis within 6 h of AMI#
- alive 35 days later30
*Emberson, et al. Lancet 2014; 384: 1929-35 #Fibrinolytic Therapy Trialists' Collaborative Group. Lancet. 1994; 343: 311-22
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Treatment and outcomeBenefit
N / 1000 treated
IV tPA within 6 h of stroke*
- alive & independent months later 42
IV thrombolysis within 6 h of AMI#
- alive 35 days later30
IV tPA within 3 h of stroke*
- alive & independent months later 90
*Emberson, et al. Lancet 2014; 384: 1929-35 #Fibrinolytic Therapy Trialists' Collaborative Group. Lancet. 1994; 343: 311-22
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Stroke Thrombolysis in Helsinki 1998-2011
Meretoja A, et al. Neurology. 2012; 79: 306-13
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4.2.ii. All eligible patients should receive IV tPA
ASAP after hospital arrival [Evidence Level A], with a
target door-to-needle (DTN) time of less than 60 min
in 90% of treated patients, and a median DTN time
of 30 min [Evidence Level B].
strokebestpractices.caInternational Journal of Stroke. Aug 2015; 10: 924-40
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Expediting Stroke
Diagnosis &
Treatment
in the ED
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Noreen Kamal, et al. International Journal of Stroke. 2018; 13: 268-76
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RxTx [Internet]. Ottawa (ON): Canadian Pharmacists Association. 2016.
Phillips SJ, Gubitz G. Acute Stroke.
https://www.e-therapeutics.ca/
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Physician’s Role
• Is it a stroke?
• Syndrome?
• Localization?
• Severity?
• Contraindications to tPA?
• Potential for embolectomy?
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Physician’s Role - 2
• Need for focused assessment
• Priority is to capture the information required
to make treatment decisions ASAP
• Defer other aspects of the assessment until
after tPA started
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Stroke: Textbook Features
SUDDEN ONSET – ‘NEGATIVE’ SYMPTOMS
• Unilateral weakness face arm leg
• Speech disturbance
• Vision loss
• Unilateral sensory loss
• Posterior circulation symptoms – diplopia,
dysarthria, dysphagia, dysequilibrium
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The NIH Stroke Scale
• Helps focus on the relevant
• Part of the lexicon of acute stroke
• 11-item scale
• Score 0 (normal) to 42 (max. severity)
• Validated for evaluation of acute stroke
patients and used in stroke trials
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http://nihss-english.trainingcampus.net/
1. LOC
2. Gaze
3. Visual fields
4. Facial palsy
5. Motor – arms
6. Motor – legs
7. Limb ataxia
8. Sensation
9. Language
10.Dysarthria
11.Extinction and
inattention
Domains of the NIH Stroke Scale
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Also gives t-PA
indications and
contraindications
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77 year-old woman
• Woke with left arm & leg weakness
• Exam findings:
– alert
– normal speech & language
– full visual fields
– left hemiplegia
– left Babinski sign
– no sensory signs
NIHSS 8
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Diagnosis?
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DWI
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DWI ADC
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DWI ADC T1
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• Hemiparesis alone is lateralizing but
not localizing
• Absence of cortical signs usually
indicates subcortical localization
• Subcortical ischemic strokes are usually
due to small-artery disease
Key
points
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51 year-old man
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51 year-old man
• Alert
• Severe dysarthria
• Left homonymous hemianopia
• Right gaze deviation
• Left hemiplegia
• Left sensory loss & extinction
NIHSS 19
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Diagnosis?
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Non-contrast CT
45 min after symptom onset; 20 min after arrival in ED
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Large-artery territory strokes are usually due to
atherothromboembolism or cardiogenic embolism
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Lacunar strokes (LACS) are usually due to
intracerebral small-vessel disease
CT Diffusion-weighted MRI
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If it’s a TIA…
• is there scope for carotid revascularization?
• is there atrial fibrillation and a need for oral anticoagulant therapy?
• is there diabetes that needs better therapy?
• ASA and clopidogrel for 21 days
• start/adjust BP lowering treatment
• start/adjust statin therapy
• smoking cessation & other life-style changes
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Is it a stroke? Hankey & Blacker. BMJ 2015; 350: h56
Stroke Mimics and Chameleons
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False-Positive Acute Stroke Protocol Activations at the Halifax Infirmary ED
> 25% not a stroke syndrome
migraine
seizure
tumour
conversion disorder
transient global amnesia
etc…
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Median Times: ED Triage to ED Discharge in 2014
ASP Activations
n=202
Other Neurology Consults
n=1135
4.7 h 7.6 h
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Andrew Demchuk, et al. Calgary Stroke Program
Stroke 2016; 47: 273-81
CT/CTA Head & Neck New Minimum Standard in Acute Stroke
• Accessibility
• Rapid acquisition
• Low risk
– low radiation exposure
– contrast–induced nephropathy 3%
– allergic reaction 1/10,000
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Andrew Demchuk, et al. Calgary Stroke Program
Stroke 2016; 47: 273-81
Stroke type
TIA
AIS
ICH
Information acquired
cervical carotid stenosis
intracranial occlusion detection
collateral assessment
patho-anatomy of aortic arch
aneurysm & AVM detection
CT/CTA Head & Neck New Minimum Standard in Acute Stroke
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Subarachnoid
hemorrhage
Cerebellar
hemorrhage
Lobar
hemorrhage
Neurosurgical Non-surgical
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86 year-old man. Non-contrast CT
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Update 2015
Thrombolytic Therapy
Treat as soon as possible without delay, and not later than 4.5 hours after
symptom-onset or last seen normal
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Update 2015
Thrombolytic Therapy
Inclusion Criteria
Age >18
<4.5 h since onset (or LSN)
Absolute Exclusion Criteria
Intracranial hemorrhage (ICH)
At ↑risk of major extracranial hemorrhage
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Update 2015
Thrombolytic Therapy
Relative Exclusion Criteria
History of ICH
Stroke or head trauma in prior 3 months
Major surgery in prior 14 days
Arterial puncture in prior 7 days
Refractory hypertension >180/105
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Update 2015
Thrombolytic Therapy
Relative Exclusion Criteria
Blood glucose <2.7 or >22.2
INR >1.7
↑PTT
PLT <100
ASPECTS <6
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Alberta Stroke Program Early CT Score
Examine all the images at the ganglionic and supra-ganglionic levels
Take off 1 pt from 10 for every region affected
8-10 Small core6-7 Moderate core0-5 Large core
aspectsinstroke.com
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Update 2015
Thrombolytic Therapy
Treatment of Bleeding Complications
Insufficient evidence to support use of:
fresh-frozen plasma
prothrombin complex concentrate
platelet transfusion
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Update 2015
Thrombolytic Therapy
Treatment of tPA-induced Angioedema
Stop t-PA
Airway management
Hydrocortisone 100 mg IV
Diphenhydramine 50 mg IV
Ranitidine 50 mg IV
[risk of ↑BP and ICH with nebulized epinephrine]
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Eligibility criteria for EVT
disabling stroke due to MCA territory deficits +
small-to-moderate ischemic core on NCCT +
intracranial proximal artery occlusion in anterior
circulation on CT angiography (CTA) +
moderate-to-good pial collateral filling on CTA,
or evidence of CT perfusion mismatch +
treatment can be started within 6 hours of
symptom recognition
Update 2015
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Last slide
1. Every minute counts!
2. Parallel processing essential
3. Keep the family close
4. Fast, focused clinical assessment
5. TPA (or not) ASAP after CT scan
6. Page Neurology if possible EVT candidate
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Atlantic Canada Stroke Conference
Lord Nelson, Halifax
November 2nd & 3rd, 2018