Acute Ischemic Stroke in the Emergency Department No financial - - PDF document

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Acute Ischemic Stroke in the Emergency Department No financial - - PDF document

10/4/18 Acute Ischemic Stroke in the Emergency Department No financial disclosures Robert L. Alunday, MD Assistant Professor Departments of Neurosurgery and Emergency Medicine Medical Director, Neurosciences ICU University of New Mexico


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Acute Ischemic Stroke in the Emergency Department

Robert L. Alunday, MD Assistant Professor Departments of Neurosurgery and Emergency Medicine Medical Director, Neurosciences ICU University of New Mexico

No financial disclosures Objectives

  • 1. Review types of strokes
  • 2. Indications and contra-indications for alteplase
  • 3. Indications for Thrombectomy
  • 4. Emergency Department Systems of Care

The Problem Nationally

795,000 Annually 1 every 40 seconds Stroke kills every 4 minutes $34 billion each year

https://www.cdc.gov/stroke/facts.htm

Three types of stroke

Case courtesy of Dr Frank Gaillard, radiopaedia.org

Case courtesy of Dr David Cuete, Radiopaedia.org, rID: 22770 https://sites.google.com/a/wisc.edu/neuroradiology/image- acquisition/vascular-imaging/mr-angiography

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SAH treatment

SBP<140, until secured

IPH treatments

BP control? Surgery Minimally invasive surgery

MISTIE II trial

Hanley Lancet Neurol. 2016 November ; 15(12): 1228–1237

MISTIE II Two types of ischemic strokes

https://www.ev3.net/assets/007/5793.jpg

http://resusreview.com/wp- content/uploads/2013/05/Alteplase_Mixing_Procedur e_9.jpg

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Why Time is Brain

There is a difference between Infarction and Ischemia You can’t help infarcted brain

1.9 million neurons lost each minute a stroke is not treated

  • Saver. Stroke 2006;37:263-266

Why Time is Brain

https://med.stanford.edu/neurology/divisions/stroke/research1.html

tPA administered within 3 hours of stroke onset decreased Death or dependency (mRS 3-6)

Wardlaw et al. Cochrane Database (review) 2014

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Time is brain

Pooled analysis of 3670 pts from ECASS I, II, III, ATLANTIS, NINDS, and EPITHET trials

Lees et al. Lancet 2010; 375:1695-1703

Inclusion/exclusion for alteplase

Scientific Rationale for the Inclusion and Exclusion Criteria for Intravenous Alteplase in Acute Ischemic Stroke. Stroke. 2016 Feb;47(2):581-641

Inclusion criteria

Diagnosis of ischemic stroke causing measurable neurological deficit Onset of symptoms <3 h before treatment begins Age ≥18 y

Exclusion criteria

Significant head trauma or prior stroke in the previous 3 mo Symptoms suggest SAH Arterial puncture at noncompressible site in previous 7 d History of previous intracranial hemorrhage Intracranial neoplasm, AVM, or aneurysm Recent intracranial or intraspinal surgery Elevated blood pressure (systolic >185 mm Hg or diastolic >110 mm Hg) Active internal bleeding Acute bleeding diathesis, including but not limited to Platelet count <100 000/mm3 Heparin received within 48 h resulting in abnormally elevated aPTT above the upper limit of normal Current use of anticoagulant with INR >1.7 or PT >15 s Current use of DOAC’s with elevated sensitive laboratory tests (eg, aPTT, INR, platelet count, ECT, TT, or appropriate factor Xa activity assays) Blood glucose concentration <50 mg/dL (2.7 mmol/L) CT demonstrates multilobar infarction (hypodensity >1/3 cerebral hemisphere) Relative exclusion criteria

Relative exclusion criteria

Only minor or rapidly improving stroke symptoms (clearing spontaneously) Pregnancy Seizure at onset with postictal residual neurological impairments Major surgery or serious trauma within previous 14 d Recent gastrointestinal or urinary tract hemorrhage (within previous 21 d) Recent acute myocardial infarction (within previous 3 mo)

FDA contraindication

Current intracranial hemorrhage Subarachnoid hemorrhage Active internal bleeding Recent (within 3 months) intracranial or intraspinal surgery or serious head trauma Presence of intracranial conditions that may increase the risk of bleeding (e.g., some neoplasms, arteriovenous malformations, or aneurysms) Bleeding diathesis Current severe uncontrolled hypertension.

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Endovascular trials of 2015 summary of studies (protocols)

n NIHSS for inclusion NIHSS Median (IQR) time from Stroke onset Additional Imaging time to groin puncture (min) Median (IQR) IV-tPA use

MR CLEAN

500 >1

17 (14-21) 6 hours

CTA

260 (210- 313) not required

ESCAPE

316 >6

16 (13-20) 12 hours

multiphasic CTA

185 (116- 315) not required

EXTEND- IA

70

none 17 (13-20) 6 hours

CTA and CTP

210 (166- 251) required

SWIFT PRIME

196 8-29

17 (13-20) 6 hours

CTA/PCT

  • r MRA/DWI/PWI

184 required

REVASCAT

206 >6

17 (12-19) 8 hours

CTA

269 (201- 340) not required

summary of study (results)

MORTALITY mRS %mRS 0-2 TICI 2b/3 symptomatic ICH MR CLEAN 18.9% / 18.4% at 30 days

3 / 4

33% / 19%

58.7%

7.7% / 6.4% ESCAPE 10% / 19%

2 / 4

53% / 23%

72.4%

3.6% / 2.7% EXTEND IA 9% / 20%

1 / 3

70% / 40%

86%

0% / 6% SWIFT PRIME 9% / 12%

2 / 3

60.1% / 35.5%

88%

5.1% / 7.2% REVASCAT 18.4%/15.5% at 90 days 43.7% / 28.2%

65.7

4.9% / 1.9%

Why were these trials successful?

Imaging base evidence of large vessel occlusion Imaging-based exclusion of patients with a large core Newer and better device (TICI 2b/3 of 25%-41% on early generation IAT vs 59-88% with stent retriever)

Meta-analysis on Thrombectomy for Stroke

NNT to reduce mRS by 1 point: 2.6 NNT to get to mRS 0-2: 6 NNT for PCI for STEMI to prevent long term death: 29

Lancet 2016; 387: 1723–31

  • Circulation. 2009; 119: 3101-3109
  • JAMA. 2016;316(12):1279-1288
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Traditional Indications for Thrombectomy

New stroke symptoms beginning within: 6 hours (anterior circulation, ICA, MCA) 12 hours (posterior circulation, basilar artery) Pre-stroke modified Rankin Scale 0 – 3 NIH Stroke Scale Score 6 or higher CT head with NO evidence of hemorrhage ASPECT score 6 – 10 CTA with occlusion of ICA or MCA (horizontal segment or proximal first vertical segment) or basilar artery that correlates with new stroke symptoms

Endovascular trials of 2017/2018 The DAWN Trial

Published Nov 11, 2017

The DAWN Trial

206 patients enrolled (planned for 500) Multicenter, prospective, RCT, Bayesian adaptive-enrichment design, and blinded assessment of endpoints Industry sponsored Authors had unrestricted access to the data analysis was performed by data-management staff from Styker, with

  • versight from independent statisticians

Missmatch (clinical symptoms vs imaging core infarct)

LVO present Age >80, NIHSS >10, Infarct <21ml Age <80, NIHSS >10, Infarct 21-31ml Age <80, NIHSS >20, Infarct 31-51ml

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DEFUSE 3

Published Jan 24, 2018

Missmatch

If NCCT done, ASPECT score >6 Infarct core <70ml Ratio of ischemia to infarction of 1.8 Absolute volume of penumbra of 15ml

DEFUSE 3

Sponsored by the NIH Any FDA thrombectomy device was used

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Results

Enrolled 182/476 patients, but stopped early in light of DAWN trial results (Per NIH)

DAWN NNT = 3 DEFUSE NNT = 4 Lessons from 2017/2018

You can help some patients in the 6-24 hour window Advanced imaging necessary

Indications for thrombectomy in the 6- 24 hour time frame

New stroke symptoms beginning within 6 – 24 hours (anterior circulation = ICA or MCA only; Does not include basilar artery) Pre-stroke modified Rankin Scale 0 – 3 CT head with NO evidence of hemorrhage MRA or CTA with occlusion of ICA or MCA (horizontal segment or proximal first vertical segment) Infarct core on DWI or CBV less than 70 ml Ratio of 1.8 of ischemic tissue to infarcted tissue (perfusion mismatch) Tmax greater than 6 seconds/ADC i. ADC less than 620 Tmax greater than 6 seconds /CBV Only if CBV is less than 30%

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Coordinated System of Care in the ED Breaking News

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N Engl J Med 2018; 379:611-622

WAKE-UP Trial

503 patients enrolled Alteplase vs standard care 70 centers in 8 European countries Last Known well >4.5 hours to infinity, but symptom recognition within 4.5 hours Early stroke based on MRI (DWI+ and FLAIR-)

Take home points

TIME IS BRAIN Alteplase is given more often than FDA indicates Advanced imaging is becoming critical Team approach (nursing, EM, stroke neurologists, radiology, pharmacy) is the only way to diagnose and treat timely