Last year I fell down suddenly without the familiar symptoms of a faint. Felt for a pulse while lying on the ground and didn't have one. Pulse came back after several more seconds.
Had a hell of a time convincing everyone in the intensive care section of the hospital that it was quite unlike a faint. Until I conveniently did it again with a monitor on. Heart block. Now a pace-maker keeps me alive 90% of the time.
Funny idea. Scary.
Cheers, Joy