No, but it might have killed the patient. Flight attendants aren't qualified to diagnose the need for O2; two doctors and two nurses on board determined the course of care.
“Flight attendants aren’t qualified to diagnose the need for O2.”
Believe me...at United Airlines, the flight attendants reached for the tank and administered oxygen whenever anyone was sick!
As an RN, I shook my head many times knowing that oxygen was not needed in many cases. But that was the only thing other flight attendants knew...they thought oxygen was the answer to any illness inflight.