Deadly heart attacks are more common on a Monday

I definitely felt Mondays on-call were much busier in the hospital. I always thought this could be due to patients spending weekends with family, not wanting to cause a fuss and maybe ignoring symptoms of cardiac chest pain until it evolves into a serious heart attack (STEMI). Also, they may be waiting to see their GP on Monday morning and then get referred to hospital (although less likely with STEMIs).

I also remember the time between Christmas and New Year being very busy - I thought for a similar reason - people understandably just don't want to be in hospital for Christmas.

I wonder if modern smartphones lay the groundwork for people knowing they're on the cusp of a heart attack.

E.g., using sensors that are cheap, and are less invasive than EKG electrodes. Kinda like the way Apple watches can now continuously monitor stuff