ischemic stroke time is brain: or is it? e. bradshaw bunney, md, facep
TRANSCRIPT
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Ischemic StrokeIschemic StrokeTime is Brain:Time is Brain:
OOr Is It?r Is It?
E. Bradshaw Bunney, MD, FACEPE. Bradshaw Bunney, MD, FACEP
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E. Bradshaw Bunney, MD, FACEPE. Bradshaw Bunney, MD, FACEP
Associate ProfessorAssociate ProfessorDepartment of Emergency MedicineDepartment of Emergency Medicine
University of Illinois at ChicagoUniversity of Illinois at Chicago
Our Lady of the Resurrection HospitalOur Lady of the Resurrection Hospital
E. Bradshaw Bunney, MD, FACEPE. Bradshaw Bunney, MD, FACEP
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E. Bradshaw Bunney, MD, FACEPE. Bradshaw Bunney, MD, FACEP
Key Clinical QuestionsKey Clinical Questions
• What is the best imaging study for diagnosing an evolving ischemic stroke?
• What therapies exist in 2007 for the treatment of ischemic stroke?
• What new therapies are on the horizon and how will they impact the EM management of stroke?
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E. Bradshaw Bunney, MD, FACEPE. Bradshaw Bunney, MD, FACEP
CaseCase• 19 yo female collapsed a work on
Super Bowl Sunday 2006• EMS found her not moving her right
side, aphasic, eyes deviated to the left• Onset time 20 minutes prior to EMS
arrival• BP 120/62, HR 84, RR 14
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E. Bradshaw Bunney, MD, FACEPE. Bradshaw Bunney, MD, FACEP
CaseCase
• In ED – Friend confirms onset time
• Friend states no PMHx, no drug or alcohol use
• PE - R arm 0/5 strength, R leg 3/5, aphasic, eyes deviated to L
• No family available
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E. Bradshaw Bunney, MD, FACEPE. Bradshaw Bunney, MD, FACEP
CaseCase• Glucose = 97• Not pregnant• CBC, electrolytes, coagulation all normal• CT head = normal• Differential Diagnosis:
• Stroke• Multiple Sclerosis• Hysteria• Conversion Reaction• Intoxicant
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E. Bradshaw Bunney, MD, FACEPE. Bradshaw Bunney, MD, FACEP
Stroke in Perspective: Stroke in Perspective:
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E. Bradshaw Bunney, MD, FACEPE. Bradshaw Bunney, MD, FACEP
Patient Aversion to Patient Aversion to Various Stroke OutcomesVarious Stroke Outcomes
0123456789
10
Languagedeficits
Cognitivedeficits
Motordeficits
Death
Mild
Moderate
Severe
Solomon NA et al Stroke 1994 25(9):1721-5.
Aversion:Aversion:
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E. Bradshaw Bunney, MD, FACEPE. Bradshaw Bunney, MD, FACEP
Ischemic Stroke Ischemic Stroke TreatmentTreatment
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E. Bradshaw Bunney, MD, FACEPE. Bradshaw Bunney, MD, FACEP
Treatment: ThrombolysisTreatment: Thrombolysis
• NINDS 1995, 3 hour window
• 30 day: absolute benefit toward favorable outcome 14% (relative 30%) (OR 1.7)
• Symptomatic ICH 6.4% vs 0.6%
• Mortality the same
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E. Bradshaw Bunney, MD, FACEPE. Bradshaw Bunney, MD, FACEP
Treatment: ThrombolysisTreatment: Thrombolysis 14% absolute increase for the best clinical
outcomes as measured by an NIHSS of 0-1. Benefit = Need to treat 8 patients with t-PA in
order to have one additional patient with this best outcome.
6% absolute increase in the number of symptomatic ICH.
Harm = Will have one symptomatic ICH for every 16 patients treated with t-PA.
2 patients will have a minimal or no deficit for everyone patient with a symptomatic ICH
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E. Bradshaw Bunney, MD, FACEPE. Bradshaw Bunney, MD, FACEP
Time to Treatment and tPA BenefitTime to Treatment and tPA BenefitBrott et al. NINDS, ECASS I and II and ATLANTIS
mRS 0-1 at day 90
Adjusted odds ratio with 95 % confidence interval by stroke onset to treatment time (OTT)
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
Ad
j us t
e d o
dd
s ra
tio
Stroke onset to treatment time (OTT) [min]
60 90 120 150 180 210 240 270 300 330 360
< 3 h 3-4 h > 4 h
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E. Bradshaw Bunney, MD, FACEPE. Bradshaw Bunney, MD, FACEP
CT-ImagingCT-Imaging
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E. Bradshaw Bunney, MD, FACEPE. Bradshaw Bunney, MD, FACEP
CT Head CT Head
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E. Bradshaw Bunney, MD, FACEPE. Bradshaw Bunney, MD, FACEP
CT Angio & PerfusionCT Angio & Perfusion
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E. Bradshaw Bunney, MD, FACEPE. Bradshaw Bunney, MD, FACEP
CTA and CTPCTA and CTP• Essential questions
• Is there hemorrhage?• Is there large vessel occlusion?• Is there “irreversibly” infarcted
core?• Is there “at risk” penumbra?
• One contrast bolus yields two datasets• Vessel patency• Infarct versus salvageable
penumbra
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E. Bradshaw Bunney, MD, FACEPE. Bradshaw Bunney, MD, FACEP
Imaging: CT angiogramImaging: CT angiogram
• Modern CT
• Digital reconstruction
• Need interpretation
• Localizes lesion
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E. Bradshaw Bunney, MD, FACEPE. Bradshaw Bunney, MD, FACEP
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E. Bradshaw Bunney, MD, FACEPE. Bradshaw Bunney, MD, FACEP
CT Perfusion TerminologyCT Perfusion Terminology
Blood FlowBlood Flow Blood VolumeBlood Volume Mean Transit TimeMean Transit Timeoror
Time to PeakTime to Peak
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E. Bradshaw Bunney, MD, FACEPE. Bradshaw Bunney, MD, FACEP
Relationship between CBV, Relationship between CBV, CBF, and MTTCBF, and MTT
MTT= Blood Flow / Blood VolumeMTT= Blood Flow / Blood Volume
Blood FlowBlood Flow Blood VolumeBlood Volume Mean Transit TimeMean Transit Timeoror
Time to PeakTime to Peak
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E. Bradshaw Bunney, MD, FACEPE. Bradshaw Bunney, MD, FACEP
MR-ImagingMR-Imaging
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E. Bradshaw Bunney, MD, FACEPE. Bradshaw Bunney, MD, FACEP
Diffusion-Weighted ImagingDiffusion-Weighted Imaging• Ischemia decreases the diffusion of water
into the brain• Extracellular water accumulates• DWI detects this as hyperintense signal• Delineates areas of irreversible damage• Present within mins
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E. Bradshaw Bunney, MD, FACEPE. Bradshaw Bunney, MD, FACEP
Perfusion-Weighted ImagingPerfusion-Weighted Imaging
• Tracks a bolus of gadolinium through the brain
• PWI detects areas of hypoperfusion• infarct core
• penumbra
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E. Bradshaw Bunney, MD, FACEPE. Bradshaw Bunney, MD, FACEP
DWI/PWI MismatchDWI/PWI Mismatch• Subtract DWI hyperintense signal area
from the PWI hypoperfused area = DWI/PWI mismatch• Hypoperfused area that is still viable
(penumbra)• Target area for reperfusion
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E. Bradshaw Bunney, MD, FACEPE. Bradshaw Bunney, MD, FACEP
Gradient Recalled Echo (GRE) Pulse Gradient Recalled Echo (GRE) Pulse SequenceSequence
• Core of heterogeneous signal intensity reflecting recently extravasated blood with significant amounts of oxyhgb
• Rim of hypointensity reflecting blood that is fully deoxygenated
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E. Bradshaw Bunney, MD, FACEPE. Bradshaw Bunney, MD, FACEP
New TherapiesNew Therapies
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E. Bradshaw Bunney, MD, FACEPE. Bradshaw Bunney, MD, FACEP
INTRA-ARTERIAL THROMBOLYSISINTRA-ARTERIAL THROMBOLYSIS
• Two randomized trials – PROACT 1 & 2
• Tested prourokinase vs. heparin <6 hours
• MCA occlusions only
• Recanalization improved with IA
• Mortality identical
• Relative risk reduction for outcome – 60%
• Risk of invasive procedure
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E. Bradshaw Bunney, MD, FACEPE. Bradshaw Bunney, MD, FACEP
IA Clinical PracticeIA Clinical Practice• Numerous clinical series published• Basilar artery thrombosis series
suggest benefit• Benefit with basilar may be late (12-24
hrs) • MRI diffusion/perfusion may aid
selection
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E. Bradshaw Bunney, MD, FACEPE. Bradshaw Bunney, MD, FACEP
Pre- and Post IA t-PAPre- and Post IA t-PA
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E. Bradshaw Bunney, MD, FACEPE. Bradshaw Bunney, MD, FACEP
Mechanical clot removalMechanical clot removal
• Invasive neuroradiologist/neurosurgeon
• Window extended to 8 to 12 hours
• Intra-arterial thrombolysis may be given after clot removal
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E. Bradshaw Bunney, MD, FACEPE. Bradshaw Bunney, MD, FACEP
Multi MERCI TrialMulti MERCI Trial• N = 164• Baseline NIHSS = 19.3• Revascularization = 68%• Good Outcome (90-day mRS < 2) =
36%• SICH = 9.8%• Mortality at 90 days = 33%
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E. Bradshaw Bunney, MD, FACEPE. Bradshaw Bunney, MD, FACEP
Multi MERCI TrialMulti MERCI Trial• Subgroup of 29% (48/164) that failed
IV t-PA• Revascularization = 73%• mRS < 2 at 90 days = 38%• SICH 10.4%
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E. Bradshaw Bunney, MD, FACEPE. Bradshaw Bunney, MD, FACEP
MERCI Clot RetrieverMERCI Clot Retriever
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E. Bradshaw Bunney, MD, FACEPE. Bradshaw Bunney, MD, FACEP
MERCI Clot RetrieverMERCI Clot Retriever
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E. Bradshaw Bunney, MD, FACEPE. Bradshaw Bunney, MD, FACEP
DesmoteplaseDesmoteplase• DIAS, DEDAS studies
• More fibrin specific, longer half life
• MRI diffusion/perfusion mismatch >20%
• NIHSS 4-20
• 3-9 hours after onset
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E. Bradshaw Bunney, MD, FACEPE. Bradshaw Bunney, MD, FACEP
DesmoteplaseDesmoteplase• N = 37• No symptomatic ICH• Reperfusion:
• Placebo 37%• 125 ug/kg 53%
• Good clinical outcome (composite):• Placebo 25%• 125 ug/kg 60%
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E. Bradshaw Bunney, MD, FACEPE. Bradshaw Bunney, MD, FACEP
ASA Guidelines 2007ASA Guidelines 2007• New EMS Section
• Educate the public• EMS use of scales• “Closest institution that can provide
emergency stroke care”• New Stroke Center Section
• Creation of Primary Stroke Center strongly recommended
• Develop Comprehensive Stroke Centers• Bypass hospitals that do not have the
resources to treat stroke
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E. Bradshaw Bunney, MD, FACEPE. Bradshaw Bunney, MD, FACEP
ASA Guidelines 2007ASA Guidelines 2007• ED Evaluation Section (Not Changed)
• Develop strict protocol• Use stroke scale
• Imaging Section• CT provides the information needed to treat• Dense artery sign assoc. with poor outcome• CTA and MR provide additional information• Insufficient data to say that other signs on
CT should stop therapy• Do not delay treatment for other images
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E. Bradshaw Bunney, MD, FACEPE. Bradshaw Bunney, MD, FACEP
ASA Guidelines 2007ASA Guidelines 2007• Management Section
• Management of HTN is controversial • No good data to guide selection of BP meds,
NTG paste??• If treat must maintain BP at 180/105 for 24 h• Glucose >140 mg/dl assoc. with poor
outcome• TPA Section
• Caution should be exercised in treating pts with major deficits, NIHSS > 20
• Aware of side effect of angioedema• Seizure is not a contraindication
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E. Bradshaw Bunney, MD, FACEPE. Bradshaw Bunney, MD, FACEP
Case OutcomeCase Outcome
• Small hospital, no neurologist interested in seeing the patient
• Called 2 Universities before finding one to accept the patient
• Family arrived, patient not improving
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E. Bradshaw Bunney, MD, FACEPE. Bradshaw Bunney, MD, FACEP
Case OutcomeCase Outcome
• Stroke neurologist = “Give IV t-PA”
• t-PA given at 2 hours 15 minutes from onset
• R arm movement and aphasia improving prior to transfer
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E. Bradshaw Bunney, MD, FACEPE. Bradshaw Bunney, MD, FACEP
Case OutcomeCase Outcome
• MRI at University = small infarct
• ECHO cardiogram = Patent foramen ovale, likely embolic stroke
• Outcome = normal except small vision loss.
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E. Bradshaw Bunney, MD, FACEPE. Bradshaw Bunney, MD, FACEP
ConclusionsConclusions• CT remains the gold standard for the diagnosis
of ischemic stroke • Thrombolytics are currently the only therapy
that can be initiated in the ED• Mechanical clot removal provides an
alternative at institutions able to use it• CTA and CT perfusion may become routine• Accurate measurement of the penumbra may
surpass the strict time nature of treatment• New therapies based on the percent of
penumbra remaining may allow for time to be relatively unimportant
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E. Bradshaw Bunney, MD, FACEPE. Bradshaw Bunney, MD, FACEP
Questions?Questions?
ferne_pv_2007_bunney_timeisbrain_6192007_finalcd04/19/23 01:20