A new report highlights research suggesting that some patients with a severe type of stroke may benefit from a clot-removal procedure even when treatment begins more than 24 hours after symptoms start.
The findings come from a clinical trial involving 336 patients in China. Researchers investigated whether mechanical thrombectomy could improve recovery in people who had a large blood vessel blocked by a clot and still had potentially recoverable brain tissue on advanced imaging.
The results offer new information about treatment options for carefully selected patients, but they do not mean that stroke treatment can safely be delayed.
What the Clinical Trial Found
The trial compared mechanical thrombectomy combined with standard medical care against standard medical care alone. Participants received treatment between 24 and 72 hours after their stroke began, with the median time to randomisation being 38.5 hours.
After 90 days, patients who underwent thrombectomy generally had better functional outcomes than those who received standard care alone. The statistical analysis showed a common odds ratio of 1.74, indicating a shift towards better outcomes in the procedure group.
The results suggest that selected patients may retain an opportunity to benefit from clot removal beyond the treatment window commonly associated with early intervention.
Treatment Also Carried Important Risks
The study found that thrombectomy was associated with a higher rate of certain serious complications. Symptomatic bleeding in the brain occurred in 4.8% of patients who underwent the procedure, compared with none in the standard-care group.
The 90-day death rate was 6.0% in the thrombectomy group and 1.8% among those receiving standard care alone.
These findings underline why treatment decisions require careful assessment. The potential benefit depends on factors such as the location of the blocked vessel and whether brain tissue remains viable, while the risks must also be considered.
Why Brain Imaging Matters
Advanced imaging helped researchers identify patients whose brain tissue might still be saved despite the time elapsed since the stroke began. This is important because not every patient arriving late will be suitable for the procedure.
The trial’s findings apply to a selected group of patients with large-vessel ischaemic stroke. They should not be interpreted as evidence that thrombectomy is appropriate for every type of stroke or every patient arriving at hospital after a delay.
What Patients and Families Should Remember
The research may help specialists refine decisions for certain patients who arrive later than expected. Further work will be needed to understand how the results apply across different healthcare settings and patient populations.
Stroke remains a medical emergency. Anyone showing sudden facial drooping, weakness in an arm or leg, difficulty speaking or other possible stroke symptoms should seek emergency medical help immediately. Patients and families should never wait for symptoms to improve because a study has examined treatment at a later stage.
