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A Review of the Exclusion Criteria for IV Rtpa for Acute Ischaemic Stroke

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A Review of the Exclusion Criteria for IV Rtpa for Acute Ischaemic Stroke A Review of the Exclusion Criteria for IV rtPA for Acute Ischaemic Stroke Dr Gary Pratt Consultant Stroke Physician Sheffield Teaching Hospitals Background • Criteria from NINDs trial – expert consensus • Great deal of experience since – RCT’s /registry data/case series • Evidence for IV thrombolysis has strengthened over time • Rationale for avoiding therapy has reduced • Low rates of thrombolysis – multifactorial but at least in part due to exclusion criteria • AHA updated guidelines 2015 • Time for us regionally to review Agenda • Stroke severity – severe/mild • Resolving • Early ischemic change on CT imaging • Recent bleeding • Blood glucose • INR • DOAC usage • Previous ICH • Intracranial aneurysms • Malignancy Stroke Severity Severe • Original FDA label, risks may be increased with NIHSS >22 • NINDS – max NIHSS 37 (few with NIHSS > 25) Mild stroke predicted good outcome but significant effect seen in strokes with NIHSS > 20. • ECASS excluded pts with NIHSS >25 Stroke Severity Severe Pts achieving primary endpoint (alive and independent) Stroke Severity Severe Recommendations • Increased risk of haemorrhage should not be used as a reason not to treat. • On the basis of available literature there should be no upper limit of NIHSS score for pts otherwise eligible for tPA within 3hrs • FDA label has removed stroke severity (either “too mild” or NIHSS > 22) Stroke Severity Mild • Disability among “mild” stroke pts is significant – not just motor - further stroke - deterioration - disability from problems not picked up on NIHSS • Prediction difficult • Risk of haemorrhagic transformation low • Few mild pts in clinical trials therefore risk to benefit ratio unknown • A number of case series and small clinical trials to suggest there may be benefit from thrombolysis especially if have vessel occlusion. AHA recommendation Within 3 hours from symptom onset, treatment of patients with milder ischemic stroke symptoms that are judged as nondisabling may be considered. Treatment risks should be weighed against possible benefits; however, more studys are needed to further define the risk-to-benefit ratio Stroke Severity Rapidly Improving • One of most common reasons for not thrombolysing • Can be misinterpreted • Many pts with initial rapid improvement remain disabled • Recommendations : • We should not be monitoring pts to see if improving • tPA remains reasonable for pts who despite rapid initial improvement remain disabled in the eyes of the examiner – “thrombolyse what’s in front of you” CT findings of early stroke • Controversy as to the degree of hypoattenuation that represents irreversible damage • ECASS 2 – no evidence that tPA less effective in pts with EIC’s in >1/3 MCA territory reliability of application of 1/3 rule • NINDS detailed review : 31% with EIC’s. No influence on treatment effect • Post hoc analysis of NINDS using ASPECTS No treatment modifying effect for outcomes for ASPECTS > 7 vs <7 CT findings of early stroke • No established extent or severity of EIC’s that should exclude someone from tPA • HOWEVER • Few trials with pts enrolled with very extensive EIC’s therefore safety and efficacy remains uncertain CT findings of early stroke • AHA Recommendations : • 1. Intravenous alteplase administration is recommended in the setting of EICs of mild to moderate extent (other than frank hypodensity) (Class I; Level of Evidence A). • 2. There remains insufficient evidence to identify a threshold of hypoattenuation severity or extent that affects treatment response to alteplase. However, administering intravenous alteplase to patients whose CT brain imaging exhibits extensive regions of clear hypoattenuation is not recommended. These patients have a poor prognosis despite intravenous alteplase, and severe hypoattenuation defined as obvious hypodensity represents irreversible injury (Class III; Level of Evidence A). History of GI/GU bleeding in last 21 days • Active bleeding = contraindication • Recent bleeding = warning – relative CI on AHA guidelines • Existing literature extremely limited. • 21 days arbitrarily chosen • Some studies with tPA used off licence included pts with “systemic disease with risk of bleeding”. Low numbers however. • Risks and benefits likely to change depending on several factors History of GI/GU bleeding in last 21 days • AHA Recommendations : Patients with a structural gastrointestinal malignancy or recent bleeding event within 21 days of their stroke event should be considered high risk, and intravenous alteplase administration is potentially harmful (Class III; Level of Evidence C). Blood glucose • Concern that hypo and hyperglycaemia can produce focal neurological deficits • Account for <1% contraindications • Hypoglycaemia rarely produces stroke like syndrome without other neuroglycopenic symptoms • Hyperglycaemia can accelerate tissue infarction, reduce chances of successful recanalisation plus concerns over increased sICH. – Low number of pts with conflicting evidence SITS EAST vs VISTA – Persistent hyperglycaemia rather than initial hyperglycaemia may be more important Blood Glucose • Special diligence in making stroke diagnosis • Treat blood glucose and reassess • AHA recommendations • 1. Intravenous alteplase is recommended in otherwise eligible patients within initial glucose levels >50 mg/ dL (Class I; Level of Evidence A). • 2. Treating clinicians should be aware that hypoglycemia and hyperglycemia may mimic acute stroke presentations and check blood glucose levels before intravenous initiation. Intravenous alteplase is not indicated for nonvascular conditions (Class III; Level of Evidence B). • 3. Treatment with intravenous alteplase in patients with acute ischemic stroke who present with initial glucose levels >400 mg/dL that are subsequently normalized and who are otherwise eligible may be reasonable (Class IIb; Level of Evidence C). INR level • >1.7 within 3 hrs, and regardless of INR > 3hrs tPA contraindicated • Numerous small studies of off label thrombolysis • SITS registry • AHA Get-With-The-Guidelines registry Odds of more favorable outcome for thrombolyzed patients compared with controls, adjusted for age, and baseline National Institutes of Health Stroke Scale (NIHSS), within subgroups of patients with specified warnings and contraindications. Benedikt Frank et al. Stroke. 2013;44:727-733 Copyright © American Heart Association, Inc. All rights reserved. INR Level • AHA recommendations : • 1. Intravenous alteplase may be reasonable in patients who have a history of warfarin use and an INR ≤1.7 (Class IIb; Level of Evidence B). • 2. Intravenous alteplase in patients who have a history of warfarin use and an INR >1.7 is not recommended (Class III; Level of Evidence B). DOAC usage • Currently there is very little data to support the thrombolysis of patients who are known to be taking DOACs. • The below guidance is based on consensus and expert opinion. • No DOAC taken in the last 48hrs • For apixaban and rivaroxaban, safe to proceed with thrombolysis if CrCl (NOT eGFR) >30ml/min. If CrCl <30ml/min , thrombolysis only recommended if greater than 72 hrs since last dose. • For Dabigatran can proceed if CrCl >50ml/min. If CrCl <50ml/min, thrombolysis only recommended if greater than 72 hrs since last dose. DOAC usage • Last dose of DOAC taken between 24 and 48 hours ago OR uncertain when last dose taken • For patients on rivaroxaban and apixaban an urgent level can be obtained. No assay is available for dabigatran or edoxaban currently out of hours in Sheffield. • If levels return <30ng/ml for rivaroxaban, apixaban or dabigatran then it will be safe to proceed with thrombolysis as that is below a detectable level. • If levels come back >30ng/ml (i.e. showing anticoagulant activity) then not to proceed with thrombolysis. • Last dose of DOAC taken within the last 24 hours • We do not recommend thrombolysis DOAC usage • AHA Recommendations The use of intravenous alteplase in patients takingdirect thrombin inhibitors or direct factor Xa inhibitors has not been firmly established but maybe harmful (Class III; Level of Evidence C). The use of intravenous alteplase in patients taking direct thrombin inhibitors or direct factor Xa inhibitors is not recommended unless laboratory tests such as aPTT, INR, platelet count, ecarin clotting time,thrombin time, or appropriate direct factor Xa activity assays are normal or the patient has not received a dose of these agents for >48 hours (assuming normal renal metabolizing function). Previous ICH • Previously CI • Updated label – recent ICH “warning” • Very low numbers in literature • Evidence for thrombolysis in setting of cerebral microhaemorrhage Previous ICH • AHA Recommendations 1. Intravenous alteplase has not been shown to increase sICH rates in patients with CMBs. Intravenous alteplase administration in these patients is therefore reasonable (Class IIa; Level of Evidence B). 2. Intravenous alteplase administration in patients who have a history of intracranial hemorrhage is potentially harmful (Class III; Level of Evidence C). Unruptured Intracranial aneurysm • Unruptured aneurysm occurs in 2-3% of general population • Data from case reports and series and more recent meta-analysis of case series Unruptured Intracranial aneurysm • AHA Recommendations 1. For patients presenting with acute ischemic stroke who are known to harbor a small or moderate-sized (<10 mm) unruptured and unsecured intracranial aneurysm, administration of intravenous alteplase is reasonable and probably recommended (Class IIa;Level of Evidence C). 2. Usefulness
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