I have seen those sort of tests, though have not participated in one.
Generally there is a doctor present in case an event happens. Some of the stats typically get quite elevated and that is why a physician is usually present, just in case. I cannot understand how yours got so out of control.
The EKG wasn't showing any abnormal activity. I've since seen articles that EKGs aren't all that accurate in women because of breast tissue (I'm not exactly in Dolly Parton territory).
Also, there were no known risk factors, i.e., no family history, non-smoker, physically active, not overweight, and in otherwise excellent health.