Actually from experience they do make sometimes make such announcements, such staff are trained in what what they are supposed to say but "don't panic, don't panic!" mode does sometimes set in. I have had to make announcements requesting the attendance of someone with medical knowledge and we were told to be aware that a a range of people might have the relevant knowledge for a medical emergency .. a dentist would likely be such a person, even a nun might have the knowledge to save a life in an emergency .. it is "any port in a storm" .. this is one situation where I would concede to @Mrs Roops or even to the forum's own Doctor Death who would at least ease the passing of the unfortunate subject of the medical emergency. I did once have the pleasure of traveling as passenger many years ago on 1Mi14 at around 0330 as it passed over Shap at 80mph and the guard made a very inept announcement requesting a "DOCTOR".