American Stroke Association Extends Clot-Busting Treatment Beyond 4.5 Hours With New CT Scan Guidance
Updated
Updated · WBAY · Jun 8
American Stroke Association Extends Clot-Busting Treatment Beyond 4.5 Hours With New CT Scan Guidance
3 articles · Updated · WBAY · Jun 8
Summary
January guidelines from the American Stroke Association let doctors give clot-busting stroke medication beyond the long-standing 4.5-hour limit when CT scans and CT angiograms show salvageable brain tissue.
CT perfusion imaging helps identify a treatable penumbra by measuring delayed blood flow—more than 6 seconds suggests blockage, while blood flow under 30% usually signals irreversible infarct.
The change addresses cases where symptom onset is unclear, including wake-up strokes; emergency teams in some hospitals aim to complete CT imaging and treatment decisions within 30 minutes.
Separate from the drug window, interventional radiologists can remove clots with catheter-based devices up to 24 hours after stroke onset.
The update comes as stroke has risen to the fourth leading cause of death in the U.S., reinforcing the BEFAST warning-sign campaign and prevention efforts on blood pressure, blood sugar, cholesterol and smoking.
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2026 Stroke Guidelines Unveiled: New Imaging Protocols, Extended Thrombolysis, and Broader Access to Thrombectomy
Overview
The 2026 AHA/ASA guidelines mark a major advance in acute ischemic stroke care by emphasizing rapid, high-quality imaging and expanding treatment options. Building on the principle that 'time is brain,' the new recommendations highlight the urgency of early intervention and introduce advanced imaging to identify more patients who can benefit from therapies, even beyond traditional time windows. These updates replace earlier guidelines, reflecting progress in diagnosis and treatment, and aim to improve outcomes by ensuring that more patients receive timely, effective care. The guidelines also stress the importance of coordinated hospital protocols and public awareness for better stroke management.