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deleted103644
Part of your perception is likely related to your station. When I have a med student working with me, I pick the more primary care type cases for them, because I don't want them to have the responsibility of determining if a patient presenting 2.5 hours after symptom onset meets tPA criteria, doing a primary survey on a sick trauma patient, etc.
At our hospital the ED would not be making the decision on tPA at all, but I guess that might depend on whether or not the hospital is a stroke center.