Although I agree with Tiger, that we are not doctors this artivcle may be of interest Heart rate
It was 40 yesterday. At the same diminishing rate it will be 22 tomorrow and 13 the next day.
Dr Didge's diagnosis? Put in a new battery or you'll run down before Christmas.
Need your O2 lievel and blood pressure to make a good guess.
Per minute? That's pretty low. You need to see a doctor