In my experience not usually. I work on the ambulance that responds to said emergency, and I usually don't even know what ends up happening to the patient after we drop them off at the hospital. The only way I usually find out is if I see them in the obituaries. So, the 911 call-taker is even less likely to know the end result, and you as the 911 caller very unlikely to ever find out unless it hits the news or, like I said, makes it into the obituaries. I really don't know how you as a bysrander could find out. You might be able to contact the ambulance/police/fire department and see if they know anything, but keep in mind we do this multiple times a week and tend to forget most calls quickly. Local hospitals might know too, but they very rarely give away anything about the patient.