Presentation on theme: "Stroke Systems of Care V.T. Doss, D.O. Stroke Medical Director, BMH-Memphis Assistant Professor, Neurology & Neurosurgery, UTHSC."— Presentation transcript:
Stroke Systems of Care V.T. Doss, D.O. Stroke Medical Director, BMH-Memphis Assistant Professor, Neurology & Neurosurgery, UTHSC
Intro Neurological emergency Ischemic vs. Hemorrhagic TOAST classification (1)thrombosis /embolism due to atherosclerosis of a large artery (2)cardioembolic origin (3)occlusion of a small blood vessel (4)other determined cause (CSVT, vasculitis, trauma) (5)undetermined cause (two possible causes, no cause identified, or incomplete investigation)
US Stats 95% of strokes at age >45, and 2/3 of strokes occur in those >65 leading cause death/disability 10% deaths worldwide 795,000 strokes/yr, 610,000 of these are first strokes. About 185,000 people who survive a stroke go on to have another In 2010, stroke cost the US $53.9 billion
According to the WHO, 15 million people suffer stroke worldwide each year. Of these, 5 million die and another 5 million are permanently disabled. Stroke is the second single most common cause of death in Europe: accounting for almost 1.1 million deaths each year. Over one in seven women (15%) and one in ten men (10%) die from the disease.
Why is Time Important? The area peripheral to a core infarct where metabolism is active but blood flow is diminished is called the ischemic penumbra This is salvageable tissue that is at risk for infarction. The penumbra lies in a 'no-man's land' between a zone of low blood flow that is < 25 ml/100 mg brain tissue/min and a zone where brain tissue is undergoing necrosis/death, flow of < 8-10 ml/100 mg/min 1 Without restoration of blood flow/oxygen, the ischemic penumbra will convert to ischemic core or tissue death 1- http://medical-dictionary.thefreedictionary.com/ischemic+penumbra Brain Ischemic Penumbr a Core Infarct
Time is Brain !! Neurology. 2000 Dec 12;55(11):1649-55Neurology. 2000 Dec 12;55(11):1649-55.
Dose.9mg/kg IV) RPCT – TPA v. Placebo < 3 hours (Dose.9mg/kg IV) Inclusion Criteria: Stroke with clear time of onset, CT without ICH, & measurable deficit on NIHSS Exclusion Criteria: Recent GI or GU Bleed w/in 21 days, Ischemic stroke within 3 months,hx of ICH, recent arterial puncture at a noncompressible site w/in 7 days, SBP > 185 or DBP > 110 that can’t be controlled, INR > 1.5, platelets 400 or < 50 Seizure at onset Phase I (N=291): TPA clinical activity @ 24 hours NIHSS improvement of >/= 4 47% TPA vs. 39% placebo, p= 0.21 Phase II (N=333): Primary Outcomes (MRS < 2) at 90 days, ARR 12%, NNT = 8 SICH 6.4 % vs. 0.6 % (P < 0.001) IV TPA APPROVED by FDA in 1996 NOW THE ACCEPTED STANDARD OF CARE THROUGHOUT US, EUROPE AND ASIA
Expanded time window for milder strokes, NIHHS < 25 with less than 1/3 of MCA territory on CT N=821 Primary endpoint: MRS < 2 @ 90 days. 52.4% vs. 45.2, P = 0.04 Number Needed to Treat = 14
Modified Rankin Scale 0 - No symptoms. 1 - No significant disability. Able to carry out all usual activities, despite some symptoms. 2 - Slight disability. Able to look after own affairs without assistance, but unable to carry out all previous activities. 3 - Moderate disability. Requires some help, but able to walk unassisted. 4 - Moderately severe disability. Unable to attend to own bodily needs without assistance, and unable to walk unassisted. 5 - Severe disability. Requires constant nursing care and attention, bedridden, incontinent. 6 - Dead.
NINDS NINDS randomized 624 subjects within 3 hours of stroke onset to receive 0.9 mg/kg of intravenous tPA or placebo found that patients treated with tPA within 3 hours of onset had a substantially better chance of functional independence with minimal or no disability 3 months after treatment The proportion of patients with minimal or no disability increased from 38% with placebo to 50% with tPA, a 12% absolute improvement The NNT for 1 more patient to have a normal or near normal outcome was 8 NNT for 1 more patient to have an improved outcome was 3.1 Brain hemorrhages related to tPA caused severe worsened final outcome in 1% of patients Overall, for every 100 patients treated within the first 3 hours, 32 had a better outcome as a result and 3 had a worse outcome.
ECASS III 821 pts, 3-4.5 hr no difference in mortality between the two groups (approximately 8%) sICH higher in tpa group (2.4%) odds for a favorable outcome (MRS 0-1) after stroke were 28% higher with alteplase than with placebo Time is tissue
NINDS and ACLS Recommended Benchmarks for Potential Thrombolysis Candidate IntervalTarget Door to doctor10 min Access to neuro expertise15 min Door to CT completion25 min Door to CT interpretation45 min Door to IV-rTPA60 min Admission to stroke unit or ICU 3 hours
Casting a wider net Expanding time window Stroke centers- primary, comprehensive Tele-stroke Multi-modal imaging New agents/devices Less is more? Neuroprotection
Tele-Stroke 24hr access to neuro specialist Avoids stroke mimickers Allows smaller hospitals to keep these patients
CSC Physicians Vascular Neurology Vascular Neurosurgery Vascular Surgery Diagnostic radiology and neuroradiology Interventional/endovascular physicians Critical care medicine Physiatrists Surgical and interventional therapies CEA Intracranial aneurysm clipping Surgical removal or draining of blood from the brain Placement of EVD and intracranial pressure monitors Endovascular treatment of aneurysms and arteriovenous malformations Intra-arterial reperfusion therapy Endovascular treatment of vasospasm I nfrastructure Stroke Unit Intensive Care Unit Operating room staffed 24/7 Interventional staff available 24/7 Stroke registry Diagnostic techniques MRI with diffusion MRA and MRV Computed Tomography Angiogram (CTA) Digital cerebral angiography Transcranial dopplers Carotid duplex ultrasound TTE and TEE Rehabilitation (PT/OT/ST) Advanced Practice Nursing /Staff stroke nurses Respiratory Therapists Educational/research programs Clinical research Community education/prevention Professional education
Mobile Stroke Unit Point-of-Care-based laboratory compact CT scan results, reviewed remotely by hospital physicians results in early pre-hospital IV- thrombolysis and subsequent bridging therapy later with IA recanalization in the hospital
Options for Patients Experiencing an Ischemic Stroke Bridging Therapy
Endovascular Therapy Anterior 12 hours Posterior <24h NIHSS >7 Evidence of Large vessel occlusion, hemodynamically unstable Large penumbra or clinical mismatch
Recanalization rate IV TPA: M1: 22%, M2:44% ‡ Mortality: 25% vs 42.9 % ## Recanalization rate with IV TPA: <10% Mortality: 73% (persistent occlusion) ^^ MCA Occlusion Internal Carotid Occlusion Basilar Occlusion Recanalization rate with IV TPA: <10% Mortality: 90% (persistent occlusion)** ‡ Alexandrov et al. Stroke ## Proact II: Jama 1999 ** Meta analysis Furlan et al ^^ Flint et al. MERCI Registry Stroke 2008
The Importance of Recanalization Recanalization is strongly associated with improved function outcomes and reduced mortality.
Meta-analysis shows a strong correlation between opening the blood vessel and patient good outcomes Rha JH, Saver JL. The impact of recanalization on ischemic stroke outcome: a meta- analysis. Stroke. 2007 Mar;38(3):967-73.
Clinical Trials Most recent published EVT (endovascular therapy) trial results Lessons learned Current trial design
New EVT Stroke Trials IMS III IMS III MR RESCUE MR RESCUE SYNTHESIS - EXPANSION SYNTHESIS - EXPANSION NEJM February 7, 2013
IMS III: Interventional Management of Stroke 3 Patients who had received intravenous rt- PA within 3 hours after symptom onset were randomized 2:1 to: IV tPA + IA therapy IV t-PA alone Primary outcome measure: 90-day mRS ≤ 2 Broderick JP. NEJM 2013;368:893-903
Primary outcome: IMS III mRS < 2 95% CI: -6.1% to +9.1% 40.8% with endovascular + IV rt- PA 38.7% with IV rt-PA alone Broderick JP. NEJM 368: 893-903, 2013
MR RESCUE: Methods ≤ 8 hours of onset Anterior circulation LVO Randomized to either EVT or Medical Mgmt “penumbral” pattern by CT or MRI Penumbra : “Small core” (<90 cc), large penumbra Non-Penumbral: Large core and small/absent penumbra Kidwell CS. NEJM 2013 Mar 7;368(10):914-23
MR RESCUE: 90-day mRS NO DIFFERENCE IN OUTCOMES Endovascular vs. medical therapy Penumbra vs. no penumbra p=0.23 p=0.32 Kidwell CS. NEJM 368: 914- 23, 2013
Synthesis Expansion: Outcomes Primary Outcome (mRS < 1) 30.4% EVT 34.8% IV tPA Death Rates EVT: 14 (8%) IV tPA: 11 (6%) “EVT is not superior to standard treatment with IV tPA” Italian Medicines Agency (AIFA) Ciccone A. NEJM 368: 904-13, 2013
IMS III Protocol Versus Contemporary Practice The majority of patients included in the study Were not imaged using modern approaches Were not triaged using modern approaches Were not treated using modern approaches
Basic Head CT only in most patients More than 40% of IMS III patients had baseline CT with ASPECTS < 7 Imaging Assessment
ASPECTS (Alberta Stroke Program Early CT Score)
Patient Selection Matters: Penumbra Pivotal Trial Small Infarct 15/30 pts Large Infarct 8/53 pts Goyal M. Stroke 2010 Independent Blinded Retrospective Analysis Baseline NCCT Data Using ASPECTS mRS ≤ 2
IMS III - Imaging Assessment Patients with “large clear regions of hypodensity” (darker than white matter and brighter than CSF) on CT, greater than 1/3 rd of MCA territory were excluded Sulcal effacement and loss of grey-white matter differentiation were not contraindications Many patients would have likely been excluded with more conservative CT reading (ASPECTS), CTA-SI (source image) ASPECTS, MR Diffusion ASPECTS, CT Perfusion or MR Perfusion
89 patients with ”no treatable or treated thrombus” 33 no thrombus seen 34 thrombus not treatable by EVT 12 with treatable thrombus but not treated No reason (1) Couldn’t safely cross occlusion (3) Recanalization during angio (2) Occlusion not responsible for clinical presentation (2) No reason (2) Would ALL have been screened out with CTA IMS III – EVT Arm
43% of large vessel occlusions have greater than 8 mm clot lengths 1 Clot characteristics (length) No Clot > 8mm recanalized with IV tPA
IMS III: Baseline CTA Occlusion Present – 90 day mRS van Elteren test p-value 0.0114
IMS III: Baseline CTA Occlusion Present - NIHSS > 20 van Elteren test p-value 0.0330
TICI Score Grade 0No perfusion Grade 1Perfusion past the initial obstruction, but limited distal branch filling with little or slow distal perfusion Grade 2aPerfusion of less than ½ of the vascular distribution of the occluded artery (e.g., filling and perfusion through 1 M2 division) Grade 2bPerfusion of ½ or greater of the vascular distribution of the occluded artery (e.g., filling and perfusion through 2 or more M2 divisions) Grade 3Full perfusion with filling of all distal branches
Percentage of Patients Who Achieved a Functional Outcome in IMS III Based on Reperfusion Result (p=0.001) In IMS III, independent functional outcome (mRS 0-2) was strongly associated with TICI 2b-3 revascularization.
IMS-III endovascular reperfusion rates: ≥ TICI 2a≥ TICI 2b ICA 65% 38% M1 81% 44% M2 77% 44% Overall 70% 40% TREVO2* 92%68% SWIFT*94%76% *Both are high quality independent core lab adjudicated, published in Lancet
Systems and Process Issues in the Era of Comprehensive Stroke Center Designation Relative to IMS I and II, the IMS III trial suffered from a dramatic delay between the initiation of iv tPA and endovascular therapy At over two hours, this lag impedes the ability of reperfusion to realize clinical benefit.
IMS III patients further suffered a significant lag between groin access and initiation of IAT at the lesion Fourty-four minutes is far beyond reported standards with modern guide and distal access catheter technology
Time to Treatment IMS III Onset to arrival:57 min Arrival to IV tPA:66 min IV to groin puncture: 86 mins Groin puncture to IA: 44 mins MR RESCUE Mean time from imaging to groin puncture: 2h 4 min SYNTHESIS Time from onset to start of treatment EVT 3.75 hrs IV2.75 hrs 130 mins between IV tPA and start of IA therapy By comparison STAR registry: Groin Puncture to guide cath placement: 12 mins Guide cath to TICI 2B/3 flow: 20 mins Critical as IA group did NOT receive IV tpa
Lessons Learned Endovascular Therapy is safe – as safe as IV rt-PA
Lessons Learned from Recent Ischemic Stroke Trials It is not IV vs EVT IV tPA is proven Class 1 – it should not be denied from patients Future trials should compare best medical management versus best medical management + EVT Only enroll patients with LVO (large vessel occlusion) Excellent recanalization is needed TICI 2B or 3 Time is Brain Better determination of salvageable brain tissue ASPECTS CT Perfusion MRI Diffusion/Perfusion
Distal aspiration with retrievable stent assisted thrombectomy for the treatment of acute ischemic stroke William Humphries 1 William Humphries 1, Daniel Hoit 1, Vinodh T Doss 1, Lucas Elijovich 1, Adam S Arthur 1Daniel Hoit 1Vinodh T Doss 1Lucas Elijovich 1Adam S Arthur 1 Abstract Objective Flexible large lumen aspiration catheters and stent retrievers have recently become available in the USA for the revascularization of large vessel occlusions presenting within the context of acute ischemic stroke (AIS). We describe a multicenter experience using a combined aspiration and stent retrieval technique for thrombectomy. Design A retrospective analysis to identify patients receiving combined manual aspiration and stent retrieval for treatment of AIS between August 2012 and April 2013 at six high volume stroke centers was conducted. Outcome variables, including recanalization rate, post-treatment National Institutes of Health Stroke Scale (NIHSS) score, symptomatic intracranial hemorrhage, discharge 90 day modified Rankin Scale (mRS) score, and mortality were evaluated. Results 105 patients were found that met the inclusion criteria for this retrospective study. Successful recanalization (Thrombolysis in Cerebral Infarction score 2B) was achieved in 92 (88%) of these patients. 44% of patients had favorable (mRS score 0–2) outcomes at 90 days. There were five (4.8%) symptomatic intracerebral hemorrhages and three procedure related deaths (2.9%). Conclusions Mechanical thrombectomy utilizing combined manual aspiration with a stent retriever is an effective and safe strategy for endovascular recanalization of large vessel occlusions presenting within the context of AIS. J NeuroIntervent Surg doi:10.1136/neurintsurg-2013-010986
Case 1 53yo male presented with L MCA syndrome NIHSS 21 Onset 1 hour Received iv-tpa within 60 min from door
Conclusions Stroke systems and patient selection critical to outcomes EMS critical to triage, stabilizing and transporting to stroke center Imperative to recognize signs and symptoms of stroke especially large vessel occlusion IV-TPA standard of care Endovascular treatment can be performed quickly and safely Time is Brain!