What is the recommended onset-to-thrombolytics time window?

What is the recommended onset-to-thrombolytics time window?

• A. 3.5 hours
• B. 4.5 hours
• C. 2 hours
• D. 5 hours

Answer: (B)

In acute ischemic stroke, the benefit of IV thrombolysis depends on treating within a defined time from when symptoms began, because faster reperfusion saves brain tissue. The recommended onset-to-needle window for IV alteplase is up to 4.5 hours in eligible adults. This sets 4.5 hours as the maximum window clinicians aim for, with treatment ideally started even earlier when possible. The other options represent shorter times or exceed the recommended limit, so they’re not the standard window. Remember, before giving thrombolytics, imaging is done to rule out hemorrhage and other contraindications, but the time window itself is the key concept for maximizing benefit.

In acute ischemic stroke, the benefit of IV thrombolysis depends on treating within a defined time from when symptoms began, because faster reperfusion saves brain tissue. The recommended onset-to-needle window for IV alteplase is up to 4.5 hours in eligible adults. This sets 4.5 hours as the maximum window clinicians aim for, with treatment ideally started even earlier when possible. The other options represent shorter times or exceed the recommended limit, so they’re not the standard window. Remember, before giving thrombolytics, imaging is done to rule out hemorrhage and other contraindications, but the time window itself is the key concept for maximizing benefit.