When i worked in a psychie hospital, had to take a patient to a and e for a drugs overdose, he was ok, and while waiting to be seen, we got talking to the middle aged chap in the next bed cubicle, whjo said he was driving into work and felt faint with a pain in his arm, so phoned gp who said go to local and e for a quick checkup.
THen the DR came in to se him and curtain was pulled back, and we could hear him giving the same symptoms to the DR, next minute he screamed, and a shout, CARDIAC ARREST, HELP PLEASE, shouted the DR, a load of nurses ran to help and we got shunted out as the chap i was with started screaming rather loudly , Hes Died, Hes Died.
It was a real shock for my patient, and for me.