A woman died a few years ago at an event in England when the pulsations in her chest set off cardiac arrhythmia

There was a case in Bromyard 30 yeas ago. Far from a ill-advised dancer, apparently he was watching, and when he got up to go during the dancing he collapsed. Mick Brooks comment was "he didn't look fit" and the knowledge was he had had a previous heart attack. But my impression was it was the music, the excitement and the adrenaline just watching, working on a weak heart.