Long story short ... My mother had several falls in 2018...
Then one day she did not feel well so went to Doctor. Nurse found a heart beat of 37, three minutes later. Doctor got 60 beats ... I said didn't the nurse get 37? So Doc looked at chart and checked again and got 30... all within 10 minutes.
They put her on vitals monitor at hospital for 12 hours ... heart beats were changing every 2 hours or so then going back to 60.
Pace maker was installed and
(they reset her points gap-
) she felt much better 1 hour after surgery.
When I talked to Doctor he said there are portable monitors that can be worn to monitor without hospital visits that can detect such conditions.