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IV Thrombolysis Offers No Benefit for Mild Stroke

May 23, 2024
in Health
IV Thrombolysis Offers No Benefit for Mild Stroke
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BASEL, SWITZERLAND — Minor ischemic stroke patients with intracranial occlusion should not be treated with IV thrombolysis, a new trial has concluded.

Results from the randomized controlled trial TEMPO-2 showed no benefit from treatment with tenecteplase following ischemic stroke. In addition, investigators found a small increased risk for symptomatic intracranial hemorrhage (ICH) and more deaths in the tenecteplase group compared with the control group.

The research suggests that although it makes sense to open up vessels in patients with minor stroke, they didn’t do better with thrombolysis.

“This is not the result we were hoping for, but I think the question of whether to treat these minor stroke patients who are not disabled has now been answered,” lead investigator Shelagh Coutts, MD, University of Calgary, Calgary, Alberta, Canada, said.

“After these results, I think we should scan these patients, admit them, give them dual antiplatelet therapy and IV fluids, and watch them like a hawk. If they deteriorate, we can intervene at that point.”

The findings were presented on May 17 at the European Stroke Organization Conference (ESOC) 2024 Annual Meeting in Basel, Switzerland, and published online simultaneously in The Lancet.

Very Little Data

Up to half of patients with ischemic stroke initially present with minimal symptoms, which are not disabling, investigators noted. Despite having low scores on the National Institutes of Health Stroke Scale (NIHSS) that typically range from 0 to 5, a third of these patients are dead or disabled at 90-day follow-up if thrombolysis is withheld.

Patients with minor deficits and evidence of an intracranial occlusion are a subpopulation at a high risk for early neurological deterioration, which most often occurs within the first 24 hours after presentation.

However, many physicians have concerns about giving thrombolysis to these patients because of the potential harm from bleeding in the absence of major deficits, and most trials of thrombolysis have excluded patients with minor stroke. That leaves very little high-quality data to guide practice for these patients.

Two previous studies have compared alteplase with antiplatelet agents in minor stroke, but no trial has specifically looked at the subset of patients with minor stroke who have intracranial occlusion. The TEMPO-2 trial was conducted to evaluate the use of tenecteplase in this patient population.

The multicenter, parallel group, open-label study was conducted at 48 hospitals in Australia, Austria, Brazil, Canada, Finland, Ireland, New Zealand, Singapore, Spain, and the United Kingdom.

The trial included patients with minor acute ischemic stroke (NIHSS score of 0-5) and intracranial occlusion or focal perfusion abnormality who were within 12 hours from stroke onset.

Patients received IV tenecteplase (0.25 mg/kg) or non-thrombolytic standard of care (control). Most patients in the control group were treated with dual antiplatelet therapy with aspirin and clopidogrel (57%) or aspirin monotherapy (23%).

The trial was stopped early for futility after 886 patients had been enrolled. The median NIHSS score was 2.

The primary outcome — a return to baseline functioning on the modified Rankin Scale score at 90 days — occurred in 75% of the control group and in 72% of the tenecteplase group (risk ratio [RR], 0.96; P=.29).

Although there were significantly more patients with early recanalization and an NIHSS score of 0 at day 5 or discharge after tenecteplase treatment, this did not translate into improved functional outcomes at 90 days.

More patients died in the tenecteplase group compared with in the control group (5% vs 1%; adjusted hazard ratio, 3.8; P=.0085).

There were eight (2%) symptomatic ICHs in the tenecteplase group vs two (

The ICH rate was not different in patients treated after 4.5 hours vs before 4.5 hours. The subgroup of patients treated at 4.5-12.0 hours showed weaker evidence of better outcomes with thrombolysis than those treated before 4.5 hours, suggesting that the 12-hour window for TEMPO-2 did not explain the absence of benefit seen with tenecteplase.

Patients in the control group did better than expected, which may have been the result of chance, patient selection, or greater use of dual antiplatelet therapy, researchers noted.

Despite higher recanalization rates in the tenecteplase group (48% vs 22%), there was no change in the rate of stroke progression between groups, with an 8% rate of progression seen overall in the study.

Noting that previous studies have shown that patients with minor stroke and intracranial occlusion are at a risk for both progression and disability, the authors suggested that good supportive care may have improved outcomes in both groups.

More Trials Needed

Commenting on the study at the ESOC meeting, Urs Fischer, MD, Basel University Hospital, Basel, Switzerland, said “What should we do for patients with mild stroke with vessel occlusion has been a huge unanswered question. The TEMPO-2 study did not show a benefit with thrombolysis, and there was a tendency toward an increased risk of ICH. This is an important finding.”

In an accompanying editorial, Simona Sacco, MD, University of L’Aquila, L’Aquila, Italy, and Guillaume Turc, MD, Université Paris Cité, Paris, France, noted that different minor ischemic stroke populations pose different therapeutic challenges.

Observational data suggest a benefit of endovascular treatment for minor stroke with large vessel occlusion, and dedicated randomized controlled trials in this group are ongoing, they added.

Early dual antiplatelet treatment is now the recommended treatment of minor stroke and should therefore be the active comparator for non-cardioembolic strokes in future trials.

While TEMPO-2 did not prove that tenecteplase is better than the standard of care for the acute treatment of minor stroke, Sacco and Turc said the study confirms that tenecteplase is associated with a high rate of recanalization.

“Fast recanalization with intravenous thrombolysis, endovascular treatment, proper patient selection, and combination with dual antiplatelet treatment or early initiation of anticoagulants may translate into tangible clinical benefits for patients with minor ischemic stroke, which should be tested in future studies,” they wrote.

This trial was funded by grants from the Canadian Institutes of Health Research, Heart and Stroke Foundation of Canada, and the British Heart Foundation. Boehringer Ingelheim provided tenecteplase for the study. Coutts reported no conflicts of interest. Sacco reported receiving grants for research from Novartis and Uriach; consulting fees from Novartis, Allergan-AbbVie, Teva, Lilly, Lundbeck, Pfizer, Novo Nordisk, Abbott, and AstraZeneca; payment for lectures from Novartis, Allergan-AbbVie, Teva, Lilly, Lundbeck, Pfizer, Novo Nordisk, Abbott, and AstraZeneca; and support for attending conferences from Lilly, Novartis, Teva, Lundbeck, and Pfizer. She is President Elect of the European Stroke Organization and Editor-in-Chief of Cephalalgia. Turc reported payment for lectures from Guerbet France, is a member of the scientific advisory board of AI-Stroke, and is the Secretary General of the European Stroke Organisation.

>>> Read full article>>>
Copyright for syndicated content belongs to the linked Source : Medscape – https://www.medscape.com/viewarticle/iv-thrombolysis-offers-no-benefit-mild-stroke-2024a10009p7

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