To medical professionals, there may be different nuances here. This is the popular understanding.
I'm not religious or superstitious, but this is very odd. Ivor Novello died in 1951 of a heart attack. Noel Coward, one of his best friends, died in 1973, 51 years ago, of a heart attack. Christopher Hassall, Novello's librettist, died in 1963, at the age of 51, also of a heart attack! Breakin the 51 theme but remaining with the health one, Clifton Webb, friend of Coward, died of a heart attack, as did both Gilbert and Sullivan, who influenced Novello! As for Hassall, I now have all sorts of lovely things to download from him! His RP accent is absolutely beautiful, as are his tones, and he is very much worth seeking out.

#ChristopherHassall #CliftonWebb #GilbertandSullivan #heartattack #IvorNovello #NoelCoward