Stroke onset to treatment time
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Stroke Onset to Treatment Time: Impact on Outcomes
Importance of Early Treatment in Acute Ischemic Stroke
The time between stroke onset and the start of treatment is a critical factor in determining patient outcomes. The first hour after stroke onset, often called the "golden hour," is associated with the highest efficacy and lowest risk of side effects for reperfusion therapies such as intravenous tissue plasminogen activator (tPA) and endovascular treatments. Patients treated within this window have significantly better chances of being discharged home, achieving independent ambulation, and avoiding disability, without an increased risk of hemorrhagic complications or in-hospital mortality 124.
Decline in Benefit with Delayed Treatment
The benefit of thrombolytic and endovascular therapies declines rapidly as the onset-to-treatment time increases. For intravenous tPA, the odds of favorable outcomes decrease most steeply within the first 170 minutes after onset, with a more gradual decline thereafter. Every hour of delay in endovascular treatment (EVT) is associated with a 5–7% decrease in the probability of functional independence and a measurable increase in mortality 1239. This pattern holds true in both controlled clinical trials and real-world clinical practice 39.
Expanding the Treatment Window: Imaging and Patient Selection
Recent advances have expanded the treatment window for some patients. Perfusion imaging can identify patients with salvageable brain tissue, allowing for safe and effective thrombolysis up to 9 hours after onset, and endovascular thrombectomy up to 24 hours in selected cases 56710. However, outcomes are generally better the sooner treatment is started, and the proportion of patients achieving good functional recovery is slightly lower in the extended time window compared to the early window 610.
Barriers to Rapid Treatment and Potential Solutions
Delays in ambulance transport, triage, and access to brain imaging are major contributors to prolonged onset-to-treatment times, limiting the number of patients eligible for reperfusion therapies. Portable neurophysiology tools such as near-infrared spectroscopy, bioelectrical impedance, and microwave imaging are being developed to speed up diagnosis and reduce treatment delays, potentially allowing for earlier intervention and improved outcomes .
Rehabilitation Timing and Outcomes
While early initiation of rehabilitation after stroke is generally associated with better outcomes, the effect of time from onset to rehabilitation is less pronounced than for acute reperfusion therapies. Other factors, such as patient age and cognitive abilities, play a larger role in rehabilitation success .
Conclusion
Shortening the time from stroke onset to treatment is crucial for maximizing recovery and minimizing disability. The greatest benefits are seen when therapies are administered as early as possible, especially within the first hour. Advances in imaging and portable diagnostic tools may further reduce delays and expand the pool of patients who can benefit from acute stroke interventions. However, rapid response systems and streamlined care pathways remain essential for improving stroke outcomes.
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