Western Governors University (WGU) D446 Adult Health II Practice Exam

What is the approved time window for intravenous tPA in eligible ischemic stroke patients?

Within 1 hour Within 24 hours Within 6 hours Within 3-4.5 hours

Correct Answer:

Within 3-4.5 hours

Explanation:

The key idea is the time window for giving intravenous tPA in acute ischemic stroke. IV tPA is most beneficial when given as early as possible after onset, but safety limits the treatment to a specific timeframe. For eligible adults, the approved window extends up to 4.5 hours from symptom onset, with the standard 3-hour window applying to broader eligibility and a 4.5-hour extension for select patients who meet additional criteria. This explains why the best choice is the 3-4.5 hour window. Treating beyond 4.5 hours increases the risk of harm without meaningful benefit. Remember that aiming for rapid treatment is crucial, though door-to-needle time is a separate performance goal from the onset-to-treatment window.

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