Final answer:
The time of onset of symptoms is crucial to determine in a stroke patient for timely treatment and better outcomes.
Step-by-step explanation:
A crucial piece of information to determine in a stroke patient is the time of onset of symptoms. The faster a stroke is recognized and treatment is provided, the better the outcome is likely to be. In the case of ischemic strokes, clot-busting drugs can be administered within a specific time frame to prevent permanent brain damage. This emphasizes the importance of quickly assessing the patient's neurological function and seeking medical help.