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 Table of Contents  
CURRENT STRATEGIES IN STROKE THERAPY: TEMPORALITY, PHARMACOLOGICAL AGENTS AND ENDOVASCULAR TREATMENTS
Year : 2018  |  Volume : 5  |  Issue : 1  |  Page : 33-38

Current strategies in stroke therapy: Temporality, pharmacological agents and endovascular treatments


1 Division of Neurosciences Critical Care, Department of Anesthesia and Critical Care Medicine, Johns Hopkins University, Baltimore, MD, USA
2 Department of Neurology, University of Massachusetts Medical School, Worcester, MA, USA

Date of Web Publication28-Jan-2019

Correspondence Address:
Brian Silver
Department of Neurology, University of Massachusetts Medical School, 55 Lake Ave, North Worcester, MA 01655
USA
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/astrocyte.astrocyte_49_18

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  Abstract 

Stroke, a leading cause of morbidity and mortality, remains an active venue for discovery. Advances in stroke neurology include prevention, treatment, and detection, in addition to rehabilitation. In terms of treatment, vast strides have been taken since the five major intra-arterial treatment trials, with extension of the treatment window in addition to the use of imaging for better patient selection. Treatment of hemorrhagic stroke has also improved in the past decade with better understanding of the pathophysiology of the disease, establishment of guidelines for blood pressure control and monitoring, treatment of coagulopathies in addition to surgical interventions. Several ongoing trials are being conducted to further elucidate the utility and efficacy of minimally invasive surgical options in deep intracranial hemorrhage.

Keywords: Cerebral infarction, endovascular treatment, outcome, risk factor modification, stroke therapy


How to cite this article:
Mayasi Y, Silver B. Current strategies in stroke therapy: Temporality, pharmacological agents and endovascular treatments. Astrocyte 2018;5:33-8

How to cite this URL:
Mayasi Y, Silver B. Current strategies in stroke therapy: Temporality, pharmacological agents and endovascular treatments. Astrocyte [serial online] 2018 [cited 2019 Feb 18];5:33-8. Available from: http://www.astrocyte.in/text.asp?2018/5/1/33/250918


  Introduction Top


Stroke remains a leading cause of morbidity and mortality [1],[2] despite advances in stroke prevention and treatment. The incidence of stroke has decreased in recent decades, as have rates of mortality due to this disease.[1],[2] Advances in stroke neurology are not limited to treatment, but include prevention, detection, and rehabilitation.[2],[3],[4]

Tissue plasminogen activator is standard in the treatment of acute ischemic stroke, irrespective of stroke etiology, up to 4.5 h of symptom onset.[5],[6] Yet, this effect is substantially reduced in patients with strokes due to large arterial occlusions.[7],[8] A dramatic change in the treatment of these latter patients occurred in 2015 when five studies, using stent retrievers and carefully selected patients with large vessel occlusion on computed tomography (CT) angiography, proved beneficial in improving outcomes in ischemic strokes due to large arterial occlusions.[9],[10],[11],[12],[13],[14] The Hermes collaboration, a patient-level data meta-analysis of intra-arterial stroke treatment trials, revealed that intra-arterial stroke therapy in conjunction with medical therapy improves outcomes compared with medical treatment alone, up to 7 h of symptom onset.[15] Importantly, the effect of endovascular therapy is time-dependent from the onset of favorable imaging, that is, the sooner the reperfusion is achieved after favorable imaging, the more likely a favorable outcome will occur. The time from symptom onset is still relevant because patients arriving much later are less likely to have favorable imaging and therefore more likely to be excluded from consideration of endovascular therapy. An estimated 10%–15% of all ischemic stroke patients may be eligible for endovascular treatment based on these findings.


  Significance of Temporality Top


The notion of “time is brain” is still key, with an estimated 1.9 million neurons lost with each minute of ischemia.[16] However, many factors beside time determine the ultimate extent of injury. Such factors include collateral circulation,[17] inflammatory response,[3] metabolic demand,[3] and premorbid leukoaraiosis burden.[18] Diffusion-weighted imaging (DWI)/FLAIR mismatch on magnetic resonance imaging (MRI) and CT perfusion mismatch in the triage of stroke patient presenting beyond 6 h are potential tools to identify those who might still benefit from treatment in that frame. In May 2017, the results of the DAWN trial were announced and showed a dramatic increase in the likelihood of a favorable outcome among patients with large vessel occlusion who had a favorable imaging profile on CT perfusion.[19],[20] The number needed to treat to result in one more person with a favorable outcome at 3 months, defined as a modified Rankin scale score ≤2, was 2.8, one of the lowest numbers needed to treat in the history of stroke trials. An additional 2%–5% of stroke patients are estimated to be eligible for treatment based on these findings. Nevertheless, the emphasis should still be on having patients present to the emergency department as soon as possible after symptom onset because a favorable imaging profile is much more likely earlier in the symptom time window. In addition, it has been shown that time to presentation to a medical facility experienced in stroke treatment leads to better outcomes irrespective of acute stroke therapy received. This has been postulated to be the result of treatment of comorbid conditions such as hypertension, glucose control, and the administration of aspirin and statins in acute setting.[21] DEFUSE-3, a multicenter, open label trial, has recently concluded that in select patients endovascular therapy is superior to medical therapy, 6–16 hours after ictus onset. Inclusion criteria aimed at selecting patient with better physiologic variables in obtaining better outcomes and these included those with NIH Stroke Scale ≥6, core infarct volume of <70 mL on CT perfusion or DWI, and mismatch volume of at least 15 mL on perfusion imaging.[22] Off note, this study included patients up to 90 years of age, with subgroup analysis revealing benefit irrespective of age given the inclusion criteria are met. In addition, the DAWN trial [Table 1] included an analysis taking into account different age groups. It revealed that patients below 80 years and those above 80 years benefit from the intervention given plausible imaging.[20],[22] These and prior studies also used the Alberta Stroke Program Early CT (ASPECT) score as a screening tool, to evaluate for infarct volume on CT head, in cases with middle cerebral artery strokes. This score ranges from 0 to 10, whereby 10 shows no signs of acute infarction, whereas 0 represents a completed middle cerebral artery (MCA) territory infarction. One point is subtracted for hypodensity in preselected regions on the CT scan, at two distinct locations (at the level of the basal ganglia and at the level of the corona radiate). A score of less than 7 was associated with poor outcomes.[23]
Table 1: Endovascular Stroke Therapy (Including Pharmacological Thrombolysis and Mechanical Thombectomy) Trials

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Individualized patient therapy has become imperative as more data are compiled in the acute setting to aid in devising treatment plans [Figure 1]. Dynamic CT angiography of the head and neck to evaluate for collateral circulation has been developed as the latter has been shown to alter infarct volume and outcomes.[24] Standardization and automation of image processing, ultimately facilitating decision-making, is an area of interest and development.[25],[26] An ongoing study from France is investigating the chronological metabolic changes after ischemic stroke through the use of sophisticated imaging techniques, which may aid in better selection of neuroprotective agents.[27]
Figure 1: Suggested Pathway for Stroke Management and Workup Sx: Symptoms; IV tPA: Intravenous Tissue Plasminogen Activator; IA: Intra-Arterial; DOACs: Direct Oral Anticoagulant; TTE: Transthoracic Echocardiogram; TEE: Transesophageal Echocardiogram; BP: Blood Pressure; HbA1c: Glycosylated Hemoglobin.

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  Newer Theorems in Neuroprotection Top


Concurrently, neuroprotection has gained ground with multiple ongoing trials. The FAST-MAG trial studied the potential effect of high-dose magnesium sulfate in the prehospital setting (i.e., ambulance) in patients with suspected acute ischemic stroke. The study did not show benefit or harm of magnesium administration at 90 days, yet proved the feasibility of early administration of medications prior to hospital arrival.[28] Other recent studies with similar negative outcomes included erythropoietin,[29] dapsone,[30] citicoline,[31] and albumin.[32] Ongoing trials include statin therapy in the NeuSTART study,[33] Tocotrienol in the SATURN study,[34] and pioglitazone.[35] Future trials of neuroprotection will focus on combining treatment with reperfusion therapy and therefore more closely follow protocols in animal temporary occlusion models, which showed benefit.

Secondary stroke prevention has also gained traction, with several studies in the pipeline. The Platelet-Oriented Inhibition in New TIA and Minor Ischemic Stroke (POINT trial) aims at evaluating the benefit of dual antiplatelets (aspirin and clopidogrel) for 3 months in preventing major vascular events.[36] Furthermore, three trials have been recently published indicating that in select patients, patent foramen ovale (PFO) closure is beneficial, but is not without risk, specifically device complications and atrial fibrillation. Patients with a large PFO associated with septal aneurysm or a large intraatrial shunt benefit the most. The benefit in PFO closure compared with antiplatelet therapy was persistent during long-term follow-up.[37],[38],[39]

Patients with nonvalvular atrial fibrillation (or atrial flutter) and a CHA2 DS2 Vasc score of 1 or more are at high risk of embolic events and benefit from lifelong anticoagulation. The CHA2 DS2 Vasc score is a score given to comorbidities known to increase the risk of thromboembolism in atrial fibrillation and includes congestive heart failure, hypertension, age (1 point for 65–74 and another point for >75), diabetes, history of stroke/transient ischemic attack (TIA) (given 2 points) and female gender.[40] Historically, this was accomplished with warfarin (a vitamin K antagonist). Yet, due to the need of frequent monitoring of therapeutic levels International Normalized Ratio (INR 2–3), and the difficulty in maintaining this therapeutic range, a novel class of anticoagulants have been introduced to the market. These medications, including dabigatran which is a direct thrombin inhibitor, epixaban, rivaroxaban, and edoxaban (Factor Xa inhibitors), are as effective as warfarin with lower risks of major hemorrhages. In addition to atrial fibrillation, indications for use of the direct inhibitors include deep venous thrombosis, which can lead to strokes in the setting of a PFO, termed as paradoxical strokes. The major limitations of these medications are the lack of reversal in the event of a major hemorrhagic. Dialysis has been postulated to be effective in decreasing the active serum concentrations of said medications; in addition, dabigatran has a reversal agent, idarucizumab.[41] New reversal agents and strategies are in the pipeline.

The recently concluded COMPASS study analyzed the benefits of dual antithrombotic agents, rivaroxaban and aspirin, comparing it with single agent antithrombotic aspirin alone or rivaroxaban alone, in patients with stable vascular disease. The included patients were those with coronary artery disease and peripheral vascular disease, in addition to asymptomatic carotid atherosclerotic disease. The study revealed that combination of low-dose rivaroxaban and aspirin decreases risk of cardiovascular events including stroke in this patient population. Yet, this is offset with a significantly higher risk of bleeding.[42] Similarly, the POINT trial [43] and NAVIGATE ESUS [44] trial recently published negative results. POINT trial investigated the utility of dual antiplatelet therapy for 3 months after TIA or minor strokes;[43] on the other hand, NAVIGATE ESUS investigated the utility of anticoagulation with rivaroxaban for strokes determined to be embolic without an obvious cause such as atrial fibrillation.[44]

Hemorrhagic stroke, a multifactorial disease, accounts for about 10%–15% of all strokes.[45] The common causes of hemorrhagic stroke include hypertension and amyloid angiopathy, in addition to primary causes due to underlying vascular lesions.[45] Emergency treatment of this disease focuses on limiting hematoma expansion, such as reversal of coagulopathy and blood pressure control, as well as addressing the possibility of increased intracranial pressure.


  New Concepts in Hypertension Control Top


Blood pressure control in hemorrhagic strokes remains controversial, with earlier guidelines recommending lowering blood pressure to below systolic of 180 mmHg. Recent studies have contradictory findings with the INTERACT-2 trial suggesting benefit of intensive blood pressure treatment (systolic below 140 mmHg) in patients with small intracerebral hemorrhages up to 7 h of symptoms onset,[46] and ATACH-2 trial, which studied a similar patient group up to 4.5 h after symptom and found no difference.[47] More recent guidelines, prior to the publication of ATACH-2, recommend aggressive blood pressure control to below 140 mmHg in the acute setting.[48]

Intracerebral hemorrhage in the setting of coagulopathy, especially iatrogenic, is an occasional consequence when using anticoagulants such as warfarin or the direct oral anticoagulants.[48] The RETRACE investigators studied the effect of INR reversal in patients presenting with vitamin K antagonist–related intracerebral hemorrhage, in a prospective cohort study. INR reversal to 1.3 within 4 h was associated with less frequent hematoma expansion and lower rates of inpatient mortality. Similarly, reduction in systolic blood pressure to less than 160 mmHg within the first 4 h after symptom onset had an additive effect in decreasing the rate of hematoma expansion.[49]

Resumption of anticoagulants after a hemorrhagic stroke is challenging for both the physician and the patient. If the decision is to resume anticoagulation, the timing of reintroduction of medication is another challenge. Moreover, the risk of ischemic stroke in atrial fibrillation and valvular heart disease is substantial, whereas the risk of bleeding is more significant closer to the inciting event.[48],[49] In prospective studies, resumption of anticoagulation in this patient population appears to be beneficial,[49],[50] though there are no randomized trials yet. The optimal timing remains elusive and guidelines recommend restarting anticoagulation no earlier than 4 weeks.[48] However, patient populations should be stratified carefully. For instance, it may be reasonable to wait at least 4 weeks before resuming anticoagulation in patients with atrial fibrillation who suffer an intracerebral hemorrhage, while a briefer period (notlonger than 3 weeks) may be appropriate in patients with mechanical valves, which have a high rate of early thrombosis.[51]


  Conclusion Top


Several advances in the treatment of patients with ischemic and hemorrhagic stroke have occurred in the past decade. Timely thrombectomy in carefully selected patients up to 24 h can result in improved outcomes, although efforts to encourage patients to present as soon as possible after symptom onset should continue as a public health campaign. A treatment paradigm can be extrapolated in which patients diagnosed with acute ischemic stroke should undergo additional imaging including vascular and perfusion imaging, be it using CT or MRI, to further stratify the benefit and possible risk of added intervention. This should be a universal occurrence specifically in stroke designated institutions, up to 24 h of symptom onset.

Limiting expansion of hematoma after intracerebral hemorrhage may prove to be beneficial with respect to improving patient outcomes in select patients although more studies are needed to better define which patients may actually benefit. Current evidence supports resuming anticoagulation in patients with atrial fibrillation or a mechanical valve who suffer an intracerebral hemorrhage. The optimal timing of restarting anticoagulation remains to be elucidated.

Financial support and sponsorship

Nil.

Conflicts of interest

There are no conflicts of interest.

 
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