Why Was the Middle Aged Man’s Heart Beating so Dangerously Fast?

https://www.nytimes.com/2019/08/22/magazine/why-was-the-middle-aged-mans-heart-beating-so-dangerously-fast.html?te=1&nl=the-new%20york%20times%20magazine&emc=edit_ma_20190824?campaign_id=52&instance_id=11873&segment_id=16454&user_id=e6a9a97f971519b8818ba7420a6d576d&regi_id=60745655